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1.
  • Montelius, Malin (författare)
  • Chlorine Cycling in Terrestrial Environments
  • 2016
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • Chlorinated organic compounds (Clorg) are produced naturally in soil. Formation and degradation of Clorg affect the chlorine (Cl) cycling in terrestrial environments and chlorine can be retained or released from soil. Cl is known to have the same behaviour as radioactive chlorine-36 (36Cl), a long-lived radioisotope with a half-life of 300,000 years. 36Cl attracts interest because of its presence in radioactive waste, making 36Cl a potential risk for humans and animals due to possible biological uptake. This thesis studies the distribution and cycling of chloride (Cl–) and Clorg in terrestrial environments by using laboratory controlled soil incubation studies and a forest field study. The results show higher amounts of Cl– and Clorg and higher chlorination rates in coniferous forest soils than in pasture and agricultural soils. Tree species is the most important factor regulating Cl– and Clorg levels, whereas geographical location, atmospheric deposition, and soil type are less important. The root zone was the most active site of the chlorination process. Moreover, this thesis confirms that bulk Clorg dechlorination rates are similar to, or higher than, chlorination rates and that there are at least two major Clorg pools, one being dechlorinated quickly and one remarkably slower. While chlorination rates were negatively influenced by nitrogen additions, dechlorination rates, seem unaffected by nitrogen. The results implicate that Cl cycling is highly active in soils and Cl– and Clorg levels result from a dynamic equilibrium between chlorination and dechlorination. Influence of tree species and the rapid and slow cycling of some Cl pools, are critical to consider in studies of Cl in terrestrial environments. This information can be used to better understand Cl in risk-assessment modelling including inorganic and organic 36Cl.
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2.
  • Berg, Björn, et al. (författare)
  • Factors influencing limit values for pine needle litter decomposition : A synthesis for boreal and temperate pine forest systems
  • 2010
  • Ingår i: Biogeochemistry. - : Springer Verlag (Germany). - 0168-2563 .- 1573-515X. ; 100:1, s. 57-73
  • Tidskriftsartikel (refereegranskat)abstract
    • We synthesized available data for decomposition of pine (Pinus) needle litter in pine forests to determine the litter chemical characteristics and climate factors that explained variation in the limit value, i. e. the level of accumulated mass loss at which the decomposition process either continues at a very low rate or possibly stops. Our data base included 56 separate studies on decomposition of pine needle litter, spanning Scots pine, lodgepole pine, Aleppo pine, stone pine and white pine, mainly incubated at the site of collection. Studies had 5 to 19 samplings, on average 10, and the decomposition was followed to a mass loss ranging from 47 to 83%, on average 67%. The periods from 3.0 to 5.4 years, on average 3.9 years, were of sufficient duration to allow estimates of limit values of decomposition. We used a linear mixed model with regression effects to relate limit values to potential explanatory variables, namely the sites' long-term mean annual temperature (MAT) and mean annual precipitation (MAP) and to substrate-chemistry factors. Regarding the latter, we explored two models; one that included initial concentrations of water solubles, lignin, N, P, K, Ca, Mg, and Mn and one that included only lignin, N, Ca, and Mn to focus on those nutrients known to influence lignin degradation. Using backward elimination significant explanatory variables were determined. For litter decomposed in its site of origin we found the limit value to depend mainly on the initial concentration of Mn, with higher Mn concentrations resulting in higher accumulated mass loss. Thus, litter with higher Mn reached a higher limit value and left a smaller stable fraction. This is likely due to the fact that Mn is an essential component of ligninolytic enzymes important for degrading litter in the later stages of decomposition. Manganese has received little attention in decomposition studies to date. Given its significance in this synthesis, the role of Mn in influencing variation in the late stages of decomposition among ecosystems and among litters of other genera besides Pinus deserves further attention.
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3.
  • Björnsson, Lovisa, et al. (författare)
  • Sustainable Cereal Straw Management: Use as Feedstock for Emerging Biobased Industries or Cropland Soil Incorporation?
  • 2021
  • Ingår i: Waste and Biomass Valorization. - : Springer. - 1877-2641.
  • Tidskriftsartikel (refereegranskat)abstract
    • Sustainability goals regarding biobased chemicals and fuels can lead to increased demand for cereal straw, which could lead to undesirable effects on soil organic matter (SOM) content. The aim of this study was to evaluate the effects of removing straw on SOM, using a life cycle approach based on agricultural statistics and soil carbon modelling. This regional evaluation in southern Sweden showed that the general restrictions on straw removal recommended in many European studies, with demands on the incorporation of at least half of the aboveground straw, is not an efficient means of SOM preservation. Unrestricted straw removal in combination with the cultivation of intermediate crops leads to a much higher SOM build-up. Such measures will increase the availability of removable straw 2.5 times, at little extra cost. The findings of this study demonstrate the necessity of regional evaluation, taking new findings on the impact of straw incorporation on SOM into consideration. This is important for both regional emerging biobased industries, where unnecessary restrictions on straw removal might hamper the development of new production pathways, and for future sustainability in agriculture, where well-intended but inefficient SOM preservation strategies might hinder the implementation of more efficient measures.
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5.
  • Bonarski, Jan T., et al. (författare)
  • Effects of cell wall ultrastructure on the transverseshrinkage anisotropy of Scots pine wood
  • 2015
  • Ingår i: Holzforschung. - : Walter de Gruyter. - 0018-3830 .- 1437-434X. ; 69:4, s. 501-507
  • Tidskriftsartikel (refereegranskat)abstract
    • A hypothesis for explaining the differential anisotropicshrinkage behavior of wood has been proposed,and it was based on the differences in the cell wall ultrastructure.The starting point of the consideration is thatwood shrinkage is governed by its chemical composition,ultrastructure, and gross anatomy. It is also well knownthat the transverse shrinkage anisotropy of earlywood(EW) is more pronounced than that of the latewood (LW).In the paper, the cell wall ultrastructure and shrinkageanisotropy has been related to each other, and to thispurpose, a set of crystallographic texture descriptorswas applied. The descriptors are based on X-ray diffraction(XRD) experiments conducted on matched EW samplesfrom different growth rings of Scots pine. The rangeof the microfibril angle (MFA) was identified. The ratio ofthe maxima of inverse pole figures (IPFs) of both the tangential(T) and radial (R) directions was determined. Theratios quantify the inhomogeneity of the spatial arrangementof the ordered areas. The results of the study clearlyindicate that the transverse shrinkage of wood is governedmostly by a specific ultrastructural organization of moderatelyorganized cell wall compounds.
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6.
  • Cucarella Cabañas, Victor (författare)
  • Recycling Filter Substrates used for Phosphorus Removal from Wastewater as Soil Amendments
  • 2009
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • This thesis studied the viability of recycling filter substrates as soil amendments after being used in on-site systems for phosphorus (P) removal from wastewater. Focus was put on the materials Filtra P and Polonite, which are commercial products used in compact filters in Sweden. A prerequisite for this choice was to review filter materials and P sorption capacity. The filter substrates (Filtra P, Polonite and wollastonite tailings) were recycled from laboratory infiltration columns as soil amendments to a neutral agricultural soil and to an acid meadow soil to study their impacts on soil properties and yield of barley and ryegrass. The amendments tended to improve the yield and showed a liming effect, significantly increasing soil pH and the availability of P. In another experiment, samples of Filtra P and Polonite were equilibrated in batch experiments with the two soils in order to study the P dynamics in the soil-substrate system.  Batch equilibrations confirmed the liming potential of Filtra P and Polonite and showed that improved P availability in soils was strongly dependent on substrate P concentration, phase of sorbed P, and soil type. Finally, samples of Polonite used for household wastewater treatment were recycled as soil amendments to a mountain meadow and to an agricultural field for wheat cropping. The liming effect of Polonite was confirmed under field conditions and the results were similar to those of lime for the mountain meadow soil. However, the results were quite different for the agricultural field, where Polonite did not affect soil pH or any other chemical and physical soil properties investigated and had no impact on wheat yield and quality. The results from field experiments suggested that Polonite can be safely recycled to meadows and cropping fields at rates of 5-10 ton ha-1 but long-term studies are needed to forecast the effects of accumulation.
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8.
  • Enfors, Elin, 1978-, et al. (författare)
  • Yield and soil system changes from conservation tillage in dryland farming : A case study from North Eastern Tanzania
  • 2011
  • Ingår i: Agricultural Water Management. - 0378-3774 .- 1873-2283. ; 98:11, s. 1687-1695
  • Tidskriftsartikel (refereegranskat)abstract
    • Yield levels in smallholder farming systems in semi-arid sub-Saharan Africa are generally low. Water shortage in the root zone during critical crop development stages is a fundamental constraining factor. While there is ample evidence to show that conservation tillage can promote soil health, it has recently been suggested that the main benefit in semi-arid farming systems may in fact be an in situ water harvesting effect. In this paper we present the result from an on-farm conservation tillage experiment (combining ripping with mulch and manure application) that was carried out in northeastern Tanzania from 2005 to 2008, testing this hypothesis. Special attention was given to the effects on the water retention properties of the soil. The tested conservation treatment only had a clear yield increasing effect during one of the six experimental seasons (maize grain yields increased by 41%, and biomass by 65%), and this was a season that received exceptional amounts of rainfall (549 mm). While the other seasons provided mixed results, there seemed to be an increasing yield gap between the conservation tillage treatment and the control towards the end of the experiment. Regarding soil system changes, small but significant effects on chemical and microbiological properties, but not on physical properties, were observed. This raises questions about the suggested water harvesting effect and its potential to contribute to stabilized yield levels under semi-arid conditions. We conclude that, at least in a shorter time perspective, the tested type of conservation tillage seems to boost productivity during already good seasons, rather than stabilize harvests during poor rainfall seasons. Highlighting the challenges involved in upgrading these farming systems, we discuss the potential contribution of conservation tillage towards improved water availability in the crop root zone in a longer-term perspective.
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9.
  • Erhagen, Björn, et al. (författare)
  • Temperature sensitivity of heterotrophic soil CO2 production increases with increasing carbon substrate uptake rate
  • 2015
  • Ingår i: Soil Biology and Biochemistry. - : Elsevier. - 0038-0717 .- 1879-3428. ; 80, s. 45-52
  • Tidskriftsartikel (refereegranskat)abstract
    • Temperature profoundly affects saprotrophic respiration rates, and carbon quality theory predicts that the rates' temperature Sensitivity should increase as the quality of the carbon source declines. However, reported relationships between saprotrophic respiration responses to temperature and carbon quality vary widely. Some of this variability may arise from confounding effects related to both substrate quality and substrate availability. The importance of these variables, as well as substrate diffusion and uptake rates, for the temperature sensitivity of saprotrophic respiration has been validated theoretically, but not empirically demonstrated. Thus, we tested effects of varying substrate uptake rates on the temperature sensitivity of organic carbon degradation. For this purpose we created a model system using the organic layer (O-horizon), of a boreal forest soil, specifically to test effects of varying monomer uptake and release rates. The addition of both monomers and polymers generally increased the temperature sensitivity of saprotrophic respiration. In response to added monomers, there was a linear increase in the temperature sensitivity of both substrate-induced respiration and the specific growth rate with increasing rate of substrate uptake as indicated by the CO2 production at 14 degrees C. Both of these responses diverge from those predicted by the carbon quality theory, but they provide the first empirical evidence consistent with model predictions demonstrating increased temperature sensitivity with increased uptake rate of carbon monomers over the cell membrane. These results may explain why organic material of higher carbon quality induces higher temperature responses than lower carbon quality compounds, without contradicting carbon quality theory. 
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10.
  • Geoinformatics 2004 : Proceedings of the 12th International Conference on Geoinformatics : Geospatial Information Research : Bridging the Pacific and Atlantic. University of Gävle, Sweden, 7-9 June 2004
  • 2004
  • Proceedings (redaktörskap) (övrigt vetenskapligt)abstract
    • FOREWORD Geoinformatics 2004, the 12th International Conference on Geoinformatics, is the premier research forum for Geospatial Information Research. It commenced in 1992 in Buffalo, and has been held every year since. Meetings have been held in North America and Asia in Beijing (1993), Calgary (1994), Hong Kong (1995), West Palm Beach (1996), Taipei (1997), Beijing (1998), Ann Arbor (1999), Monterey (2000), Bangkok (2001), Nanjing (2002), and Toronto (2003, cancelled due to the outbreak of SARS). This is the premier event organized by the University of Gävle, together with the Association of Chinese Professionals in Geographic Information Science (CPGIS-abroad).   This conference is the first of the series that takes place in Europe, hence the subtitle of the conference - bridging the Pacific and Atlantic. I believe it offers an opportunity for all professionals involved in research and development of geographic information systems, global position systems and remote sensing to discuss new theories and technologies around geoinformatics research.   Based on the extended abstracts and following advice from the program committee, the organizing committee selected 108 papers (involving 264 authors from 29 different countries) around 10 different themes included in the proceedings. The conference themes include some emerging research issues such as location-based services and geovisualization as well as long studied conventional issues. As a post-conference publication effort, some selected papers around special themes will go another round of review process to be published in special issues with some scientific journals.   The organization of the event is rather team-oriented work. On behalf of the organizing committee, I would like to thank CPGIS, the University of Gävle, our sponsors and all those individuals involved in making it a successful event, in particular, Kickan Fahlstedt, the conference secretary who took most administrative and organizational matters into her hands; Anders Brandt who read the papers and provided useful comments to the authors; Bengt Eriksson, Stig-Göran Mårtensson, and Bengt Rystedt who are always very supportive for the event; Peter Fisher and David Maguire who share their vision on current geoinformatics research; and all the authors who contribute with their papers of high quality.   Last but not least, the following colleagues or students deserve special thanks for their contributions to the organization of the conference: Gunter Göckelmann, Pia Ollert- Hallqvist, Anna Hansson, Neta Hedberg, Elisabeth Hugg, Mikael Johansson, Rebecca Jonsson, Hendrik Loch, Bengt-Olof Lundinger, Staffan Nygren, Kaj Wejander, and Wenjun Xie.   Welcome to the Geoinformatics 2004, and enjoy your stay in Gävle!   Bin Jiang Co-chair of the organizing committee   ---   CONTENTS - VOLUME 1 Keynote session The logic of fuzzy detecting change in geographical information, p. 3 P. Fisher Distributed GIS: computing in the internet age, p. 4 D. Maguire Plenary session About egocentric geovisualisation, p. 7 L. Meng Shannonian, semantic and pragmatic geoinformation, p. 15 J. Portugali Spatio-temporal modelling and analysis of geolifelines, p. 22 C. Claramunt Location-based service, mobile GIS and GPS Location-based solutions for application services, p. 25 K.H. Kim, S.G. Hong, J.H. Park and J.H. Lee A test-bed simulator for GPS and GIS integrated navigation and positioning research: - bus positioning, using GPS observations, odometer readings and map matching, p. 31 J. Li, G. Taylor, C. Brunsdon, A. Olden, D. Steup and M. Winter Real-time map labelling for personal navigation, p.  39 Q. Zhang and L. Harrie Multi-criteria decision analysis for location based services, p.  47 M. Raubal and C. Rinner Map generalization for OSMasterMap data in location based services & mobile GIS applications, p. 54 S. Anand, J.M. Ware and G.E. Taylor The media and the messages of location-based services (LBS): death of distance or the revenge of geography?, p. 61 D.Z. Sui Real time community mapping: evaluating two wireless technology approaches, p. 69 Y. Lao Digital data collection and analysis techniques for forestry applications, p. 77 M.G. Wing and L.D. Kellogg A review of research and development on intelligent transport systems in Hong Kong - a geographic information system perspective, p. 84 W.Z. Shi and H.K. Lam A distributed architecture for WAP-based mobile GIS, p. 92 Wang F., Bian F. and Hou Y. Efficient routing service for the open LBS services, p. 99 S.-S. Kim and J.-H. Park Network perspective for spatial data distribution on wireless environments, p. 107 E. Lee, M.-J. Kim, M. Kim and B.-T. Jang Precise navigation with the use of buffer zones, p. 115 A. Banachowicz and J. Uriasz The implementation of presentation service using JAVA web services, p. 120 T.-W. Heo and J.-H. Park An open architecture of common core component for location based service, p. 127 J.-C. Kim, J.-H. Park and J.-H. Lee Open LBS solution architecture using service chaining webservices technology, p. 134 S.-G. Hong, K.-H. Kim and J.-H. Park Analysis accuracy integrated position of hyperbolic system JEMIOLUSZKA and satellite navigation system GPS, p. 139 A. Banachowicz and R. Kamiński Spatio-temporal modelling and databases A web-based multimedia framework for diffusing spatio-temporal information: application to natural hazards, p. 149 P-A. Davoine, J. Gensel and H. Martin Continuous data warehouse: concepts, challenges and potentials, p. 157 T.O. Ahmed, M. Miquel and R. Laurini An extended locking method for geographical database with spatial rules, p. 165 Cheng C., Shen P., Zhang M. and Lu F. A hybrid approach to detect spatial-temporal outliers, p. 173 T. Cheng and Z. Li A knowledge-based restricted problem solving method in GIS applications, p. 179 Wei H., Xu Q. and Bai Y. Representation of moving objects along a road network, p. 187 N. Van de Weghe, A.G. Cohn, P. Bogaert and P. De Maeyer A three-dimensional temporal GIS for the analysis of morphometric changes, p. 195 M. Sriti, R. Thibaud and C. Claramunt Quality assessment and uncertainty handling in spatial data mining, p. 203 B. He, T. Fang and D. Guo From the schema matching to the integration of updating information into user geographic databases, p. 211 A. Braun Construction and specification of spatial configurations in a geographical information retrieval context, p. 219 M. Ould Ahmed Limam and M. Gaio A new tetrahedral network (TEN) generation algorithm for 3-D GIS, p. 226 Song Z., Liu Y. and Niu W. GIS data modeling of 17th century fortresses on Dardanelles, p. 233 C. Guney, B. Yuksel and R.N. Celik The spatial data server based on open GIS standards in heterogeneous distributed environment, p. 241 M.-J. Kim, E. Lee, B.-W. Oh and M. Kim Vector cellular automata based geographical entity, p. 249 Hu S. and Li D. A method for testing low-value spatial clustering, p. 257 G. Lin and T. Zhang Research on Petri Net based spatiotemporal data model, p. 265 Yin Z. and Li L. Advances in earth observation technologies Lossless inter-array predictive coding for subpixel-shifted satellite images based on texture analysis, p. 275 Gao S., Zhang X.J. and Sun W.D. Visualizing distributions from multi-return lidar data to understand forest structure, p. 283 D. Kao, M. Kramer, A. Love, J. Dungan and A. Pang 3D scanning and photogrammetry for heritage recording: a comparison, p. 291 W. Boehler and A. Marbs On modelling and visualisation of high resolution virtual environments using LIDAR data, p. 299 S. Ahlberg, U. Söderman, M. Elmqvist and Å. Persson The utilization of GPR data in GIS, p.  307 Chen B.Z., Hu Z.Q. and Li W.D. APIAS - Airborne photos and images attainment system, p. 311 J.C.C. Gonçalves Junior, E.C. Piovesan, G.C. Silveira and E.A. Silva Geovisualisation Representation of geographic terrain surface using global indexing, p. 321 J. Kolar Geo-visualization support for multidimensional clustering, p. 329 G. Andrienko and N. Andrienko Annotated observations as knowledge construction elements in visual data analysis, p. 336 I. Denisovich 3D geovisualization as a communication and analysis tool in fluvial geomorphology, p. 339 S.A. Brandt and B. Jiang A study on algorithms of a 3D visualization dynamic modification system based on TIN, p. 347 P. Yang, H. Lin, S.J. Mao and D. Shen A multi-user mobile system to visualize environmental processes, p. 355 J. Danado, E. Dias, T. Romão, N. Correia, A. Trabuco, C. Santos, J. Serpa, M. Costa and A. Câmara Interacting with 17th century fortresses on Dardanelles through web-based geo-visualization, p. 363 C. Guney and R.N. Celik Visualization of landscape data in digital maps by exclusive use of XML-based languages, p. 370 K. Neumann, P. Ahlbrecht, S. Eckstein, B. Mathiak and A. Kupfer Embedding digital rights in geovisualizations, p. 375 J. Döllner Experimental research on web-based 3D terrain visualization - using Java3D and Microsoft.Net, p. 383 Wang Y., Tan H. and Liu J. The principles of designing CIS - cartographic information system, p. 389 Zheng S. and Chen Y. A network common data form (NetCDF) utility for efficient environmental data processing and visualization, p. 397 J. Liu, J.M. Chen, D.T. Price, and S. Liu Design and implementation of high precision map symbol library based on GDI+, p. 405 Wu X., Du Q., Cai Z. and Xu Z. User-centered 3D geovisualisation, p. 412 A. Nielsen Studying groundwater resource by volume visualization technology, p. 417 Zhu G., Xu Z., Wu X. and Yan H. Cognition theory-based research on adaptive user interface for GEO-visualization system, p. 424 Ling Y., Chen Y. and Wang Y.   CONTENTS - VOLUME 2 GIS in urban planning and modelling Spatial patterns of urban growth in Nepal: a GIS-assisted analysis, p. 435 M. Adhikari, B.A. Portnov and M. Schwartz What's planning (support system design)?, p. 443 M. Campagna and G. Deplano GIS and remote sensing for urban planning: a case of Festac town, Lagos, Nigeria, p. 451 M.J. Fasona and A.S. Omojola Geographical information systems on the web for public participation in planning, p. 459 O. Gudes, E. Stern and T. Svoray Study on China National Park planning supported by spatial information technology, p. 464 Dang A., Liu X., Yang R. and Zhuang Y. Uncertainty and data quality Uncertainty evaluation of military terrain analysis results by simulation and visualization, p. 473 P. Horttanainen and K.Virrantaus Defuzzification operators for geographical data of nominal scale, p. 481 T. Hatzichristos and J. Potamias Fuzzy model and Kriging for imprecise soil polygon boundaries, p. 489 R. Sunila, E. Laine and O. Kremenova Fuzzy description of fuzzy direction relations and their similarities, p. 496 Du S., Wang Q. and Yang Y. A new approach for modeling uncertainty in remote sensing change detection process, p. 503 A. Alimohammadi, H.R. Rabiei and P.Z. Firouzabadi GIS in environmental management and decision making Mapping landslide susceptibility in the Three Gorges area, China using GIS, expert systems and fuzzy logic, p. 511 A-X. Zhu, R. Wang, J. Qiao, Y. Chen, Q. Cai and C. Zhou A 3D GIS for managing building rehabilitation process, p. 518 F. Ramos, D. Siret and M. Musy Spatial-temporal carbon sequestration under land USE and land cover change, p. 525 S. Liu, J. Liu and T.R. Loveland GIS based analysis of store closure: a case study of an Office Depot store in Cincinnati, p. 533 Y. Xu and L. Liu Branch bank closures in Sydney: a geographical perspective and analysis, p. 541 L. Zhao, B. Garner and B. Parolin Integration of multidisciplinary knowledge and modelling techniques for a river-SDSS, p. 549 J. Möltgen and G. Schmidt Applications of GIS and RS for land use dynamics monitoring in the rim zone of North China, p. 557 Z. Qin, B. Xu, J. Liu and W. Zhang A methodology for siting a water harvesting reservoir, p. 565 W.M. Jabre and F.A. Awar Landscape indices for comparison of spatial forest patterns in different geographical regions, p. 573 E.M. De Clercq and R.R. De Wulf GIS in spatial management on a local level of administration in Poland, p. 578 P. Fogel and J. Fiszczuk-Wiktorowicz Development of spatial GIS database for monitoring on dynamic state of grassland productivity, p. 585 and animal loading balance in Northern China B. Xu, X. Xin, Z. Qin, H. Liu, Z. Chen, G. Yang, W. Wu, Q. Zhou and X. Wu Remote sensing coupled to a database of catchments and coastal zones, p. 593 S.G. Halldórsdóttir and H. Þorbergsson Regionalization of N2O measurements for the North China Plain, p. 599 G. Bareth and M. Kogge Application of RS and GIS in ecological environmental dynamic monitoring and management information system, p. 607 Liao K. Geospatial cancer analysis for the state of Santa Catarina, brazil - environmental parameters considered, p. 615 C.E. Hübner and F.H. Oliveira Information extraction from remote sensing data Object-based updating of land-use maps of urban areas using satellite remote sensing, p. 623 R.J. Dekker Multiscale object-specific analysis: scale problems and multiscale solutions, p. 631 O. Hall, G.J. Hay and D.J. Marceau A greedy point algorithm derived by Gabor filter bank for IKONOS satellite image segmentation, p. 639 N. Nezamoddini-Kachouie and J. Alirezaie A modeling-based threshold approach to derive change/no change information over vegetation area, p. 647 Y. Hu, S.M. de Jong and R. Sluiter A neural network approach for information extraction from remotely sensed data, p. 655 J. Liu, G. Shao, H. Zhu and S. Liu New stereo matching and 3D view generation algorithms using aerial stereo images, p. 663 J.-C. Kim and J.-H. Park Comparison of remote sensing based analysis of crop diseases by using high resolution multispectral and hyperspectral data - case study: Rhizoctonia solani in sugar beet -, p. 670 R. Laudien, G. Bareth and R. Doluschitz A comparison of land-use classification with sampled IKONOS and TM imagery, p. 677 Tang Z. and Zhu L. Quality study of ASTER data geometry by digitize contour lines in ILWIS, p. 683 A. Partovi, K. Grabmaier and J. Hendrikse A new algorithm for map projection reverse transformation in GIS, p. 691 Teng J., Huang W. and Sun M. Exploitation of geospatial techniques for studying the snow and water runoff parameters, p. 699 A.S. Almas, M. Azam, M.J. Butt and S. Amer Land cover mapping of Khulna City applying remote sensing technique, p. 707 M. Billah and G.A. Rahman Integration of ground sampling with satellite imaging through GIS database to monitor rangeland productivity for grazing in north China, p.  715 Z. Qin, B. Xu, W. Li, W. Zhang and J. Liu Forestry inventory and information systems in developing countries: constraints and benefits, p. 723 S.M. Malaza, P.G. Abbot and S. Mabena Multi-scale representation and generalisation Building a multi-granularity based spatial database, p. 733 Cheng C. and Lu F. Automated generalisation in a multiple representation database, p. 741 M. Dunkars Data update across multi-scale databases, p. 749 H.-K. Kang, J.-W. Moon and K.-J. Li Modelling urban road networks integrating multiple representations of complex road and junction structures, p. 757 N.N. Ulugtekin, A.O. Dogru and R.C. Thomson Streaming of compressed multi-resolution geographic vector data, p. 765 J. Persson Metadata and spatial data infrastructure A hierarchical framework to aid the entry of metadata, p. 775 J.-H. Hong, Y.-H. Chen and H.-P. Liao Building a taxonomy of GI knowledge - using Bloom's taxonomy to evaluate non-professional users' understanding of GI, p. 783 M. Arleth Opportunities and challenges for SDI development in developing countries - a case study of, p. 789 Uganda M. Musinguzi, G. Bax and S.S. Tickodri-Togboa SDI and network-based GIS for disaster management, p. 797 A. Mansourian, A. Rajabifard and M.J.V. Zoej Discovering structure in geographical metadata, p. 805 I. Podolak and U. Demšar Map interface valid coverage analysis based on XML metadata, p. 812 H.-P. Liao and J.-H. Hong A cadastral domain model, p. 820 J.M. Paasch
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