7 R software, http: www.r-project.org

8 R Newsletter, http: cran.r-project.org/doc/Rnews/

9 R/GRASS interface, http: cran.r-project.org/src/contrib/

10 geoR software, http: www.est.ufpr.br/geoR/

11 GPS Manager, http: www.ncc.up.pt/gpsman/

12 gpspoint, http: gpspoint.dnsalias.net/

13GPStrans, http: sourceforge.net/projects/gpstrans 14GPSBabel, http: sourceforge.net/projects/gpsbabel 15UMN/MapServer project, http: mapserver.gis.umn.edu 16UMN/MapServer Applets,

http: www2.dmsolutions.ca/mapserver/ 17GDAL/libgrass page

http: www.remotesensing.org/gdal/frmt grass.html 18 Simple demonstrational GRASS / UMN/MapServer (Spearfish data),

http: grass.itc.it/start.html

References

Abramowitz, M., and I.A. Stegun, 1964. Handbook of Mathematical Functions. New York: Dover, 297-300, 228-231.

Albertz, J., 1991. Grundlagen der Interpretation von Luft- und Satellitenbildern: Eine Ein-fuhrung in die Fernerkundung. Darmstadt: Wissenschaftliche Buchgesellschaft.

Albrecht, J., 1992. GTZ-handbook GRASS. Univ. of Vechta. http: grass.itc.it/gdp/

Alexandrov, A.D., A.N. Kolmogorov, M.A. Lavrentev (eds), 1989. Mathematics. Its content, methods, and meanings. Vol. 2, 6th print. Cambridge (MA): MIT Press.

Arge, L., J.S. Chase, P. Halpin, L. Toma, J.S. Vitter, D. Urban, and R. Wickremesinghe, 2003. Efficient Flow Computation on Massive Grid Terrain Datasets, Geolnformatica, 7(4), 283313.

Bailey, T.C., and A.C. Gatrell, 1995. Interactive spatial data analysis. Essex: Pearson.

Baker, W.L., and Y. Cai, 1992. The r.le programs for multiscale analysis of landscape structure

using the GRASS geographical information system. Landscape Ecology, 7(4), 291-302. Baker, W.L., 2001. The r.le programs. A set of GRASS programs for the quantitative analysis

of landscape structure Version 5.0. Tech. report, Department of Geography and Recreation,

University of Wyoming, 11/2001. Bartelme, N., 1995. Geoinformatik. Modelle, Strukturen, Funktionen. Berlin: Springer. Becker, R.A., J.M. Chambers, and A.R. Wilks, 1988. The New S Language. London: Chapman

& Hall.

Bierhals, E., 1988. CIR-Luftbilder fur die flachendeckende Biotopkartierung. Informations-dienst Naturschutz Niedersachsen 5/88. Hannover, 77-104.

Bill, R., 1996. Grundlagen der Geo-Informations-Systeme. Analysen, Anwendungen und neue Entwicklungen. Vol. 2, Heidelberg: Wichmann.

Bivand, R.S., 2000. Using the R statistical data analysis language on GRASS 5.0 GIS database files. Computers & Geosciences, 26, 1043-1052.

Bivand, R.S., and A. Gebhardt, 2000. Implementing functions for spatial statistical analysis using the R language. Journal of Geographical Systems, 3(2), 307-317.

Bivand, R.S., and M. Neteler, 2000. Open Source geocomputation: using the R data analysis language integrated with GRASS GIS and PostgreSQL data base systems. Proc. 5th conference on GeoComputation, 23-25 August 2000, University of Greenwich, U.K. http: reclus.nhh.no/gc0 0/gc0 0 9.htm

Blazek, R., M. Neteler and R. Micarelli, 2002. The new GRASS 5.1 vector architecture. Proc. Open Source GIS - GRASS users conference, 11-13 September 2002, Trento, Italy.

Brandon, R.J., T. Kludt, and M. Neteler, 1999. Archaeology and GIS - The Linux Way. Using GRASS and Linux to analyze archaeological data. Feature article, Linux Journal (7), 50-54.

Brown, W.M., M. Astley, T. Baker, and H. Mitasova, 1995. GRASS as an integrated GIS and visualization environment for spatio-temporal modeling. Proc. Auto-carto XII, ACSM/ASPRS, Charlotte, NC, 89-99.

http: www2.gis.uiuc.edu:22 8 0/modviz/brown/papers/AC12.html Bugayevskiy, L.M, and J.P. Snyder 2000. Map Projections. A reference manual. London,

Philadelphia: Taylor & Francis. Burns, L.E., M.B. Werdon, and R.J. Newberry, 2000. Evaluation of Satellite and Airborne Synthetic Aperture Radar Data for an Area Northeast of Fairbanks, Alaska. Electronic Document: http: www.astf.aeromap.com/dggs fr.html Burrough, P.A., 1986. Principles of GIS for land resources assessment. Oxford: Clarendon

Press.

Burrough, P.A., and R.A. McDonnell, 1998. Principles of Geographical Information Systems.

New York: Oxford University Press. Chambers, J.M., and T.J. Hastie, 1992. Statistical Models in S. London: Chapman & Hall.

Chavez, P.C., S.C. Guptill, and J.A. Bowell, 1984. Image processing techniques for Thematic

Mapper data. Proc., Am. Soc. Photogr. 2, 728-743.

Chavez Jr., P.S., 1996. Image-based atmospheric corrections - revisited and improved. Photogr.

Eng. & Rem. Sens., 62(9), 1025-1036. Clarke, K.C., 2002. Getting started with Geographic Information Systems. 4th ed. New Jersey:

Prentice Hall.

Clarke, K.C., B. Parks, and M. Crane, (eds) 2002. Geographic Information Systems and Environmental Modeling. Upper Saddle River, New York: Prentice Hall. Cressie, N.A.C., 1993. Statistics for spatial data. New York: Wiley.

Dana, P.H., 2000. Map projections, coordinate systems. The Geographers Craft Project. Department of Geography, The University of Colorado at Boulder. http: www.colorado.edu/geography/gcraft/ notes/mapproj/mapproj f.html http: www.colorado.edu/geography/gcraft/ notes/coordsys/coordsys f.html Desmet, P.J.J., and G. Govers, 1996. A GIS procedure for automatically calculating the USLE LS factor on topographically complex landscape units. J. Soil and Water Conservation, 51(5), 427-433.

Dikau, R., 1989. The application of a digital relief model to landform analysis in geomorphol-ogy. In Raper, J. (ed), Three dimensional applications in Geographic Information Systems. London: Taylor & Francis, 51-77.

Evenden, G., 1995. Cartographic Projection Procedures for the Unix Environment - A Users Manual. U.S. Geological Survey Open File Report 90-284. http: www.remotesensing.org/proj/

Fortune, S.J., 1987. A Sweepline Algorithm for Voronoi Diagrams. Algorithmica 2, 153-174.

Furlanello, C., M. Neteler, S. Merler, S. Menegon, S. Fontanari, A. Donini, A. Rizzoli, and C. Chemini, 2003. GIS and the randomForest Predictor: integration in R for tick-borne disease risk assessment. Proceedings of Distributed Statistical Computing 2003 , Eds: Hornik, K.,

Leisch, F., Vienna, Austria, 20-22 March 2003.

Goodchild, M.F, L.T. Steyaert, and B.O. Parks (eds), 1993. Geographic Information Systems

and Environmental Modeling. New York: Oxford University Press. Goodchild, M.F., L.T. Steyaert, and B.O. Parks (eds), 1996. GIS and Environmental Modeling:

Progress and Research Issues. Ft. Colins: GIS World, Inc.