| 1. |
- Balestro, Gianni, et al.
(författare)
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Geology of the southern Dora-Maira Massif : insights from a sector with mixed ophiolitic and continental rocks (Valmala tectonic unit, Western Alps)
- 2020
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; 16:2, s. 736-744
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Tidskriftsartikel (refereegranskat)abstract
- In the Valmala sector of the southern Dora Maira Massif (Western Alps), two different eclogite- and blueschist-facies units (i.e. the Rocca Solei and Dronero units, respectively), are separated by a shear zone (i.e. the Valmala Tectonic Unit), which peculiarly consists of mixed slices of ophiolitic and continental rocks. A detailed geological map at 1:10,000 scale allowed to point out that the tectonic slices within the Valmala Tectonic Unit consist of 'native' rock slices wrenched from the overlying Dronero Unit, and 'exotic' rocks likely sourced from other units of the Dora Maira and from a continental margin and an oceanic basin. On the contrary, rock slices sourced from the underlying Rocca Solei Unit are lacking. The overall tectonic stack results after an early subduction-related deformation phase (i.e. the D1), and the pervasive overprinting of two subsequent exhumation-related deformation phases (i.e. the D2 and D3). The Valmala Tectonic Unit is inferred to have played a role in decoupling the southern Dora Maira Massif during subduction, and/or in driving exhumation of the ultra-high pressure rocks occurring in the adjoining Brossasco-Isasca Unit.
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| 2. |
- Blomdin, Robin, 1986-, et al.
(författare)
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Glacial geomorphology of the Altai and Western Sayan Mountains, Central Asia
- 2016
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; 12:1, s. 123-136
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Tidskriftsartikel (refereegranskat)abstract
- In this article, we present a map of the glacial geomorphology of the Altai andWestern Sayan Mountains, covering an area of almost 600,000 km2. Although numerous studies provide evidence for restricted Pleistocene glaciations in this area, others have hypothesized the past existence of an extensive ice sheet. To provide a framework for accurate glacial reconstructions of the Altai and Western Sayan Mountains, we present a map at a scale of 1:1,000,000 based on a mapping from 30 m resolution ASTER DEM and 15 m/30 mresolution Landsat ETM+ satellite imagery. Four landform classes have been mapped: marginal moraines, glacial lineations, hummocky terrain, and glacial valleys. Our mapping reveals an abundance of glacial erosional and depositional landforms. The distribution of these glacial landforms indicates that the Altai and Western Sayan Mountains have experienced predominantly alpine-style glaciations, with some small ice caps centred on the higher mountain peaks. Large marginal moraine complexes mark glacial advances in intermontane basins. By tracing the outer limits of present-day glaciers, glacial valleys, and moraines, we estimate that the past glacier coverage have totalled to 65,000 km2 (10.9% of the mapped area), whereas present-day glacier coverage totals only 1300 km2 (0.2% of the mapped area). This demonstrates the usefulness of remote sensing techniques for mapping the glacial geomorphology in remote mountain areas and for quantifying the past glacier dimensions. The glacial geomorphological map presented here will be used for further detailed reconstructions of the paleoglaciology and paleoclimate of the region.
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| 3. |
- Chandler, Benjamin M.P., et al.
(författare)
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Glacial geomorphology of the Gaick, Central Grampians, Scotland
- 2019
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; 15:2, s. 60-78
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Tidskriftsartikel (refereegranskat)abstract
- The Gaick is an enigmatic glaciated landscape in the Central Grampians, Scotland, dominated by an expansive dissected plateau. Previous studies have postulated widely differing interpretations of the glacial landforms and current understanding of the glacial events in this area is partly restricted by the absence of detailed glacial geomorphological mapping. To address this issue, we present a comprehensive 1: 46,000-scale glacial geomorphological map, covering an area of ∼520 km2. A combination of detailed field mapping and interpretation of aerial photographs and Digital Surface Models (DSMs) has revealed a variety of glacial, periglacial and fluvial landforms, including an abundance of moraines and meltwater channels within valleys. We also identify a glacial sediment-landform assemblage, dissected glaciogenic material, that has not previously been reported in the Scottish Highlands. The geomorphological map provides the necessary foundation for elucidating the extent, dynamics and timing of former glaciation in the area.
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| 4. |
- Cocq, Coppélie, Professor, 1977-, et al.
(författare)
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A web experience exploring spatio–linguistic data : the case of place-making signs in northern Sweden
- 2024
-
Ingår i: Journal of Maps. - : Taylor & Francis. - 1744-5647. ; 20:1
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Tidskriftsartikel (refereegranskat)abstract
- Previous research has highlighted the limitations encountered in representing the dynamism of language use and contacts. Here, linguistic landscapes from five towns in Northern Sweden are the point of departure for investigating novel perspectives through the geovisualization of multilingualism, with the ultimate aim of understanding how languages in our surroundings help construct public spaces. As an outcome, a web GIS application, based on 6865 thematically analyzed photographs, was developed as an interactive resource for visualizing and sharing the data and enabling new modes of analysis and new research questions. The article describes the data collection and curation processes, app development using GIS software and software-as-a-service, the eventual app design and interaction, and the update and maintenance plans, as well as discussing challenges and considerations related to temporalities, spatialities, and technicalities. The web GIS has potential applications in spatial analysis, research communication, and education.
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| 5. |
- De Angelis, Hernán
(författare)
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Glacial geomorphology of the east-central Canadian Arctic
- 2007
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Ingår i: Journal of Maps. - 1744-5647. ; v2007, s. 323-341
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Tidskriftsartikel (refereegranskat)abstract
- This article describes palaeoglaciological mapping of the portion of the Canadian Arctic formerly covered by north-easternmost Laurentide Ice Sheet. The mapped area stretches between the meridians 106°W and 61°W, and the parallels 60°N and 75°N, embracing an area of 3.19 x 10^6 km^2. The work was focused on determining the location of landforms that are required as input for a glaciological inversion model, i.e. glacial lineations, eskers, moraine ridges, ribbed moraine and De Geer moraines; and forms the basis of a reconstruction of the geometry and evolution of palaeo-ice streams in this portion of the Laurentide Ice Sheet. Emerged areas were mapped through the geomorphological interpretation of Landsat 7 Enhanced Thematic Mapper Plus (ETM+) satellite images. Information on striae and other minor indicators of glacial activity were extracted from maps and reports by the Geological Survey of Canada, published articles and, on a few locations, by the author's own observations. Information on landforms located on some submerged areas where extracted from publicly available sonar surveys. All data were digitally processed within a Geographical Information System and stored in a spatially enabled database. The results are presented as a printable map at 1:2,400,000 scale.
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| 6. |
- Fu, Ping, 1982-, et al.
(författare)
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Glacial geomorphology of the Shaluli Shan area, southeastern Tibetan Plateau
- 2012
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; 8:1, s. 48-55
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Tidskriftsartikel (refereegranskat)abstract
- We present a glacial geomorphological map covering 1.04 x 10(5) km(2) of the Shaluli Shan (Shan Mountain), southeastern Tibetan Plateau. Using a 90 m digital elevation model from the Shuttle Radar Topography Mission and 15/30 m Landsat Enhanced Thematic Mapper Plus satellite imagery, we have mapped glacial valleys, marginal moraines, hummocky terrain, glacial lineations and ice-scoured terrain. Lineations and scoured areas largely overlap on the low relief granite plateau of the Shaluli Shan and relate to former ice cap glaciation. These landscape features indicate that past ice cap glaciation included basal sliding conditions, and thus warm-based ice. Glacial valleys and marginal moraines are dominant landforms in the high mountain ranges of Shaluli Shan and occur on and fringing the plateau. This glacial geomorphological map forms the basis for paleoglaciological reconstructions of this southeastern Tibetan Plateau region and indicates the former presence of multiple glaciations involving valley glaciers and ice caps. The map is presented at a scale of 1:630,000.
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| 7. |
- Hall, Ola, et al.
(författare)
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World Poverty, Environmental Vulnerability and Population at Risk for Natural Hazards
- 2008
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; , s. 151-160
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Tidskriftsartikel (refereegranskat)abstract
- The objective of the accompanying map is to show the relation between world poverty, environmental vulnerability and population at risk for natural hazards. Sub-national infant mortality rates are used as proxy for poverty and mapped as a bivariate choropleth map together with national levels of environmental vulnerability. Past density and distribution of natural hazards were mapped on to a textonequarter degree grid and presented as an inset map. An inset map with global population densities is also provided. All maps are in Lambert cylindrical equal-area projection. The main map scale is 1:100 000 000. According to the result from the bivariate mapping of poverty and environmental vulnerability, the world can be stratified into three groups. 1) Regions with low poverty rates and relatively high degree of environmental vulnerability (e.g. Scandinavia, North America). 2) Regions with high levels of poverty and a relatively low degree of environmental vulnerability (3.g. parts of East-Africa, parts of Russia). 3) Regions with high poverty rates and high degrees of environmental vulnerability levels (e.g. middle parts of Asia). When this information is combined with that of population density and natural hazard density and distribution it is clear that those belonging to group three are very vulnerable with usually high population densities and a location prone to natural hazards. This type of small scale mapping is a good way of exploring relations between variables, observing geographical patterns and bringing forward new hypotheses for future research directions, and should be viewed as a complement to large scale mapping and field inventories.
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| 8. |
- Heyman, Jakob, et al.
(författare)
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Glacial geomorphology of the Bayan Har sector of the NE Tibetan Plateau
- 2008
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; 2008, s. 42-62
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Tidskriftsartikel (refereegranskat)abstract
- We here present a detailed glacial geomorphological map covering 136,500 km2 of the Bayan Har sector of the northeastern Tibetan Plateau - an area previously suggested to have nourished the most extensive Quaternary glaciers of the Tibetan Plateau. The map, presented at a scale of 1:650,000, is based on remote sensing of a 90 m SRTM digital elevation model and 15/30 m Landsat ETM+ satellite imagery. Seven landform types have been mapped; glacial valleys, glacial troughs, glacial lineations,marginal moraines, marginal moraine remnants, meltwater channels and hummocky terrain. A large number of glacial landforms exist, concentrated around mountain blocks protruding above the surrounding plateau area, testifying to former glacial activity. In contrast, large plateau areas of lower altitude lack glacial landforms. The mapped glacial geomorphology indicates multiple former glacial advances primarily by valley and piedmont glaciers, but lends no support to the hypothesis of ice sheet scale glaciation in the area. The presented glacial geomorphological map demonstrates the usefulness of remote sensing techniques for mapping the glacial geomorphology of the Tibetan Plateau, and it will be used for reconstructing the paleoglaciology of the Bayan Har sector of the northeastern Tibetan Plateau.
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| 9. |
- Hillier, J. K., et al.
(författare)
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Manual mapping of drumlins in synthetic landscapes to assess operator effectiveness
- 2015
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; 11:5, s. 719-729
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Tidskriftsartikel (refereegranskat)abstract
- Mapped topographic features are important for understanding processes that sculpt the Earth's surface. This paper presents maps that are the primary product of an exercise that brought together 27 researchers with an interest in landform mapping wherein the efficacy and causes of variation in mapping were tested using novel synthetic DEMs containing drumlins. The variation between interpreters (e.g. mapping philosophy, experience) and across the study region (e.g. woodland prevalence) opens these factors up to assessment. A priori known answers in the synthetics increase the number and strength of conclusions that may be drawn with respect to a traditional comparative study. Initial results suggest that overall detection rates are relatively low (34-40%), but reliability of mapping is higher (72-86%). The maps form a reference dataset.
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| 10. |
- Hughes, Anna L.C., et al.
(författare)
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Dating constraints on the last British-Irish Ice Sheet: a map and database : a map and database
- 2011
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; , s. 156-184
-
Tidskriftsartikel (refereegranskat)abstract
- We present a collation of 975 published dates relevant to the timing of build-up and retreat of ice over the British Isles during the most recent glacial stage. The spatial distribution of dates is essential to interpreting the evolution of the ice sheet over time and space. For this reason the dates are presented as a map showing the spatial distribution across the UK and Ireland. Full documentation for each date, attributed to its source publication and detailing geographic location, the material dated, its stratigraphic position or setting, the dating technique, the dating result, errors and calibration, and comments pertinent to its interpretation, are included in the accompanying table. It is anticipated that this dataset will be a useful resource for Quaternary research in the UK and Ireland and is therefore available to download as a shapefile and/or PDF file. The map is presented at a scale of 1:2,700,000, designed to be printed at A2 size.
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| 11. |
- Khorchani, M., et al.
(författare)
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Average annual and seasonal Land Surface Temperature, Spanish Peninsular
- 2018
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; 14:2, s. 465-475
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Tidskriftsartikel (refereegranskat)abstract
- The first long-term Land Surface Temperature (LST) maps for the Peninsular Spain at annual and seasonal time scales for 1981-2015 is presented in this work. A robust protocol for correcting and calibrating NOAA-AVHRR images and computing LST datasets at the spatial resolution of 1.1km has been used. Simultaneously, maximum air temperature (Tmax) maps at the same spatial resolution have been produced using data from meteorological stations. The comparison between the two datasets resulted in statistically significant spatial correlations at annual and seasonal scales. Finally, the Normalized Difference Vegetation Index (NDVI) data were also compared with the obtained LST datasets and the results showed significant negative correlations between the two variables, especially in summer.
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| 12. |
- Kveladze, Irma, et al.
(författare)
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What can location-based social media reveal on human migration patterns in Europe?
- 2024
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Ingår i: Journal of Maps. - : Taylor & Francis. - 1744-5647. ; 20:1
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Tidskriftsartikel (refereegranskat)abstract
- Numerous visualisation methods have been proposed, including Origin-Destination maps to represent movement patterns gathered from social media; however, visual clutter remains a persistent issue due to complex data dimensionality. Besides, most Origin-Destination maps fail to illustrate the temporal dimension of social network phenomena within the geographical environment. To tackle this issue, we propose the visualisation method for geo-located Facebook social-media data while emphasising the time aspect. Based on the citizen-generated data for the European Union (EU), we estimated the EU citizens’ residing or travelling across the EU member states as a means of current and previous destinations to reveal the extent of the hypothetical human migration. The proposed methodology consists of Origin-Destination maps implemented within the time geography framework as a model to support the process of analysis for decision-making. The generated visualisation allows comprehension of the scale of human movement distribution internally within the EU from a space–time perspective.
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| 13. |
- Lindholm, Miranda S., et al.
(författare)
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Glacial geomorphology of the Maidika region, Tibetan Plateau
- 2016
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; 12:5, s. 797-803
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Tidskriftsartikel (refereegranskat)abstract
- We present a glacial geomorphological map at a scale of 1: 200,000 of the Maidika region in the southeastern part of the central Tibetan Plateau covering 13,600 km(2). Based on the 90 m resolution SRTM elevation model, the 30 m resolution ASTER GDEM elevation model, and the Landsat ETM+ satellite imagery of 30/15 m resolution, we have mapped glacial valleys, marginal moraines, glacial lineations, and hummocky terrain. Glacial landforms occur frequently and indicate extensive past glaciation with alpine style valley glaciers as well as more extensive ice fields. Of particular interest is the presence of glacial lineation swarms, which is unusual for the Tibetan Plateau glacial landform record. Based on the distribution of glacial landforms, we present a generalized maximum glacial extent reconstruction covering 6045 km(2) or 44% of the map.
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| 14. |
- Margold, Martin, 1981-, et al.
(författare)
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Glacial geomorphology and glacial lakes of central Transbaikalia, Siberia, Russia
- 2011
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; , s. 18-30
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Tidskriftsartikel (refereegranskat)abstract
- A glacial geomorphological map is presented covering the poorly investigated mountainous region ofcentral Transbaikalia, Russia. Interpretation of geomorphology is achieved using remotely sensed data (SRTM digital elevation model, Landsat 7 ETM+ satellite imagery and Google Maps). Glacially modified terrain is mapped together with moraines, glacial lineations and meltwater channels, in order to provide an estimate of the area affected by glaciation. The glacial landform record varies across the mapped region implying that the character of glaciation was not uniform in the area. Several moraine generations occur in the main valleys and at some places glaciers blocked the drainage routes, which resulted in the formation of glacial lakes. The largest, Glacial Lake Vitim, was dammed by a glacier lobe blocking the Vitim valley in the Kodar Range. A distinct fossil shoreline of Glacial Lake Vitim occurs along a substantial part of the former shore at a level of 840 m a.s.l. A col through which the lake drained to the River Nercha occurs at an elevation consistent with the shoreline level of 840 m a.s.l. The existence of another glacial lake in the Chara basin is inferred from mapped delta surfaces and a probable blockage of the Chara River by advancing valley glaciers. The rich and diverse geomorphology and the sedimentary record of glacial lakes represent a potential for more detailed studies of the glacial and climate history of this remote region.
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| 15. |
- Margold, Martin, 1981-, et al.
(författare)
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Glacial meltwater landforms of central British Columbia
- 2011
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; , s. 486-506
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Tidskriftsartikel (refereegranskat)abstract
- The Cordilleran Ice Sheet (CIS), which grew and melted repeatedly across the mountain ranges of westernmost Canada during the late Cenozoic, has imprinted its legacy in the form of glacial landforms, such as meltwater landforms. However, despite their abundance, a coherent effort to map meltwater landforms has been lacking. Here, we present a first regional geomorphological map of glacial meltwater landforms of central British Columbia. Series of well-developed meltwater channels occur at higher elevations on the Interior Plateau, in marginal ranges east of the Coast Mountains, in the Skeena and Omineca mountains, and, in much lower abundances, in the Rocky Mountains. Single-ridged eskers, that in direction are consistent with the regional ice flow direction from glacial lineations, occur in elevated areas of the Interior Plateau. Multiple-ridged larger eskers and esker complexes are, on the other hand, confined to the main topographic lows. The geographical distribution of meltwater landforms is a new reliable dataset for use in palaeoglaciological reconstructions and inference of late glacial ice sheet dynamics in central British Columbia.
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| 16. |
- Margold, Martin, et al.
(författare)
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Ice streams in the Laurentide Ice Sheet : a new mapping inventory
- 2015
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; 11:3, s. 380-395
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Tidskriftsartikel (refereegranskat)abstract
- Rapidly flowing ice streams dominate the drainage of continental ice sheets and are a key component of their mass balance. Due to their potential impact on sea level, their activity in the Antarctic and Greenland Ice Sheets has undergone detailed scrutiny in recent decades. However, these observations only cover a fraction of their 'life-span' and the subglacial processes that facilitate their rapid flow are very difficult to observe. To circumvent these problems, numerous workers have highlighted the potential of investigating palaeo-ice streams tracks, preserved in the landform and sedimentary record of former ice sheets. As such, it is becoming increasingly important to know where and when palaeo-ice streams operated. In this paper, we present a new map of ice streams in the North American Laurentide Ice Sheet (LIS; including the Innuitian Ice Sheet), which was the largest of the ephemeral Pleistocene ice sheets and where numerous ice streams have been identified. We compile previously published evidence of ice stream activity and complement it with new mapping to generate the most complete and consistent mapping inventory to date. The map depicts close to three times as many ice streams (117 in total) compared to previous inventories, and categorises them according to the evidence they left behind, with some locations more speculative than others. The map considerably refines our understanding of LIS dynamics, but there is a clear requirement for improved dating of ice stream activity.
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| 17. |
- Mercer, Andrew
(författare)
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A DEM of the 2010 surface topography of Storglaciären, Sweden
- 2016
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; 12:5, s. 1112-1118
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Tidskriftsartikel (refereegranskat)abstract
- During the summer of 2010 the surface elevation of Storglaciären in northern Sweden was measured using high-precision GNSS and reflectorless Total Station surveys. The DEM created from these data contain less noise than those created from orthophotographic methods over snow covered glaciers and is therefore smoother, with fewer erroneous features in the data. The principal, though not sole, intended use for the DEM is in the calculation of surface mass balance, which has influenced decisions on what constitutes a functional part of a glacier, leading to the exclusion of features such as snow aprons and perennial ice above the bergschrund. Other peripheral features have changed since the previous, aerial survey from 1999 leading to a reduction in size of approximately 0.17 km(2).
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| 18. |
- Morén, Björn, et al.
(författare)
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Glacial geomorphology of the central Tibetan Plateau
- 2011
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; 7:1, s. 115-125
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Tidskriftsartikel (refereegranskat)abstract
- The glacial geomorphology of the central Tibetan Plateau was mapped over 285,000 km2. Here we present a map covering 135,000 km2 at a scale of 1:660,000. The glacial geomorphology was mapped using 15 and 30 m resolution Landsat 7 ETM+ satellite imagery, a 90 m resolution SRTM digital elevation model, and satellite and aerial images displayed in Google Earth. Four landform categories were discernible and mapped; glacial valleys, marginal moraines, glacial lineations, and hummocky terrain. The mapped landforms indicate multiple glacial advances of valley and piedmont glaciers. The mapped landform record lends no support to individual ice centres having coalesced to form a plateau-wide ice sheet.
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| 19. |
- Newall, Jennifer C. H., et al.
(författare)
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The glacial geomorphology of western Dronning Maud Land, Antarctica
- 2020
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; 16:2, s. 468-478
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Tidskriftsartikel (refereegranskat)abstract
- Reconstructing the response of present-day ice sheets to past global climate change is important for constraining and refining the numerical models which forecast future contributions of these ice sheets to sea-level change. Mapping landforms is an essential step in reconstructing glacial histories. Here we present a new map of glacial landforms and deposits on nunataks in western Dronning Maud Land, Antarctica. Nunataks are mountains or ridges that currently protrude through the ice sheet and may provide evidence that they have been wholly or partly covered by ice, thus indicating a formerly more extensive (thicker) ice sheet. The map was produced through a combination of mapping from Worldview satellite imagery and ground validation. The sub-metre spatial resolution of the satellite imagery enabled mapping with unprecedented detail. Ten landform categories have been mapped, and the landform distributions provide evidence constraining spatial patterns of a previously thicker ice sheet.
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| 20. |
- Norris, Sophie L., et al.
(författare)
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Glacial landforms of northwest Saskatchewan
- 2017
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; 13:2, s. 600-607
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Tidskriftsartikel (refereegranskat)abstract
- A comprehensive map of glacial landforms is presented for the area of northwest Saskatchewan, Canada. Remote sensing of 1-arc (similar to 30 m resolution) Shuttle Radar Topography Mission digital elevation models over an area of approximately 15,000 km(2) were used as the primary data source for landform identification. A total of 16,856 landforms were identified pertaining to Quaternary glacial and postglacial activity. Ten landform types were mapped: ice flow parallel lineations (flutings, drumlins, mega-scale glacial lineations, and crag-and-tail ridges), moraines (major and minor), ice-thrust ridges, crevasse-fill ridges, meltwater landforms (major and minor meltwater channels and eskers), palaeo-shorelines and dunes. Collectively, these landforms constitute a glacial and postglacial landform record, which exhibits a more complex pattern than previously recognised, with evidence of multiple cross cutting ice flow directions. This geomorphological mapping of the regional landform record provides the prerequisite for future reconstructions of the glacial dynamics and chronology of northwest Saskatchewan.
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| 21. |
- Pearce, Danni M., et al.
(författare)
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The glacial geomorphology of upper Godthabsfjord (Nuup Kangerlua) in southwest Greenland
- 2018
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Ingår i: Journal of Maps. - : Taylor & Francis. - 1744-5647. ; 14:2, s. 45-55
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Tidskriftsartikel (refereegranskat)abstract
- The Greenland Ice Sheet (GrIS) is known to have experienced widespread retreat over the last century. Information on outlet glacier dynamics, prior to this, are limited due to both a lack of observations and a paucity of mapped or mappable deglacial evidence which restricts our understanding of centennial tomillennial timescale dynamics of the GrIS. Here we present glacial geomorphological mapping, for upper Godthabsfjord, covering 5800km(2) at a scale of 1:92,000, using a combination of ASTER GDEM V2, a medium-resolution DEM (error <10m horizontal and <6m vertical accuracy), panchromatic orthophotographs and ground truthing. This work provides a detailed geomorphological assessment for the area, compiled as a single map, comprising of moraines, meltwater channels, streamlined bedrock, sediment lineations, ice-dammed lakes, trimlines, terraces, gullied sediment and marine limits. Whilst some of the landforms have been previously identified, the new information presented here improves our understanding of ice margin behaviour and can be used for future numerical modelling and landform dating programmes.Data also form the basis for palaeoglaciological reconstructions and contribute towards understanding of the centennial to millennial timescale record of this sector of the GrIS.
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| 22. |
- Peterson, Gustaf, 1982, et al.
(författare)
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Glacial geomorphology of the south Swedish uplands – focus on the spatial distribution of hummock tracts
- 2017
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; 13:2, s. 534-544
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Tidskriftsartikel (refereegranskat)abstract
- We present the first comprehensive glacial-landform map of the south Swedish uplands (SSU), deglaciated 15–13ka ago, using one consistent method and dataset; a Light Detection and Ranging-derived digital elevation model. In particular, this map focuses on the spatial distribution of hummock tracts. The distribution of hummock tracts reinforces previous thinking of a broad lobate east–west zone of hummocks across the southern part of the SSU. But this map also reveals a pattern of hummock tracts confined in what we call hummock corridors that have a radial pattern sub-parallel to the overall ice-flow direction. Hummocks occur in a wide variety of morphologies, but we also show the distribution of two distinct forms: V-shaped hummocks and ‘ribbed moraine’. Cross-cutting relationships between hummocks and glacial lineations indicate a more complex chronology than previously suggested. In places, lineations are overlain by hummocks and in other places hummocks are overlain by lineations. Additionally, directional variation of glacial lineations together with a complex end-moraine pattern suggests a dynamic ice sheet with multiple small lobes. Finally, mapped end moraines help to better correlate the deglacial timescales of western and eastern Sweden.
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| 23. |
- Schneider, Ramona A. A., et al.
(författare)
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Paleoglacial footprint and fluvial terraces of the Shaluli Shan, SE Tibetan Plateau
- 2021
-
Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; 17:2, s. 439-452
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Tidskriftsartikel (refereegranskat)abstract
- This study provides mapping of glacial and fluvial geomorphology in the Shaluli Shan region on the eastern margin of the south-eastern Tibetan Plateau. Based on TanDEM-X 12 m elevation data and GoogleEarth imagery, glacial valleys, ice-marginal moraines, glacial lineations, scoured terrain and fluvial terraces were mapped. Covering around 11,000 km2, this map is the first for this region to display geomorphology at a spatial resolution of 0.4 arcsec (= c. 11 m) and to include fluvial terraces. Its glacial landform distribution is largely consistent with previous mapping. The substantially higher level of detail in this study is reflected in an approximately tenfold number and smaller median sizes of individual landforms such as moraines and glacial lineations. These results underscore the importance of high-resolution DEM data such as TanDEM-X for the identification of glacial and fluvial geomorphology. The map presented here will be used for detailed paleoglacial reconstructions and landscape evolution studies combining both glacial and fluvial landforms.
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| 24. |
- Stroeven, Arjen P., et al.
(författare)
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Glacial geomorphology of the Tian Shan
- 2013
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; 9:4, s. 505-512
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Tidskriftsartikel (refereegranskat)abstract
- The glacial geomorphology of the Tian Shan has been mapped, with the study area covering almost 638,000km(2). The map, designed to be printed at A0 size due to the elongated shape of the mountain range, is presented at a scale of 1:1,100,000. Five glacial landform categories are presented; glacial valleys, marginal moraines, glacial lineations, hummocky terrain and meltwater channels. These landform categories were mapped using the Shuttle Radar Topography Mission (SRTM) digital elevation model (90m resolution), Landsat 7 ETM+ satellite imagery (30m resolution), and images contained in Google Earth. The mapped landforms were created by glaciers that were restricted to mountain areas and their immediate surroundings.
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| 25. |
- Öhrling, Christian, et al.
(författare)
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Glacial geomorphology between Lake Vänern and Lake Vättern, southern Sweden
- 2020
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Ingår i: Journal of Maps. - : Informa UK Limited. - 1744-5647. ; 16:2, s. 776-789
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Tidskriftsartikel (refereegranskat)abstract
- The glacial geomorphology between the lakes Vänern and Vättern is presented on a 1:220,000 scale, LiDAR-based map covering approximately 18,000 km2. Fifteen landform units have been mapped; end moraines, De Geer moraines, drumlins, crag-and-tails, hummock tracts and corridors, irregular ridges, murtoos, eskers, deltas/sandur, outwash complexes, meltwater channels, boulder bars/sheets, the Timmersdala ridge, raised shorelines, sand dunes and prominent landslide scars (the last three are post-glacial). The area includes moraines associated with the Younger Dryas cold interval and drainage deposits of the Baltic Ice Lake. Additionally, the map reveals previously undetected geomorphic features including (1) murtoos, (2) abundant traces of meltwater erosion manifested as channels and hummock corridors, (3) laterally extensive end-moraine systems (the Remmene and Kungslena ice-margin positions) and (4) the distinct lobate shape of end moraines formed above the highest shoreline. This map provides a uniform base for future use in georesources, paleo ice-sheet modelling, geologic history, and geoconservation. © 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group on behalf of Journal of Maps.
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