Dear Malik,
I'm a newcomer to GRASS and R myself, having recently moved over from ArcGIS/Erdas, so I'm probably not the best person to assist you. My suggestion was merely that it seems sensible to use a GIS software to do a GIS task, particularly one such as classification which often requires a large degree of interaction with the data to define training samples and improve the classification iteratively. I'm interested to hear opinions from others - is GRASS the best route for land-cover classification, or are stand-alone packages in R a viable alternative? Any advice would be much appreciated - thank you. Regarding the use of GRASS and R, my understanding is that you start R through the GRASS terminal and then work in the usual R interface. This presumably allows R to apply GRASS commands to the GIS layers in the location & mapset you started GRASS in. This booting of R through GRASS is briefly described at the end of the http://grass.fbk.eu/statsgrass/grass6_r_install.html. If you need help in installing the xml package (from the list, not from newbie me!), you would need to provide more information about your setup (operating system/R version), what method you used to install (download zip file, install directly through R?), and the precise error message. However, I strongly suggest that you use the online help and maillist archives to try and find your answer before sending a request to the list. I hope that helps - other readers please do feel free to correct any errors or omissions of mine. Best wishes, Lucy From: Malik Shahzad [mailto:geoma...@live.com] Sent: 17 November 2010 08:24 To: conservation...@btinternet.com Subject: RE: [R-sig-Geo] Package for Classification???? Dear Dr. Lucy! Thanks for your kind help. As per your instructions I tried to install GRASS. Then I tried to load package "spgrass6" in R and found error: Need "XML" Package and I am unable to install XML package for windows... from http://cran.r-project.org/web/packages/XML <http://> Second, I will work in R-Interface after loading GRASS package or I have to work in GRASS Interface??? Please help me in this regards, As I am new in both packages... & once again thanks... with Best Regards, Malik Shahzad Visiting Researcher National Institute of Informatics (NII) Tokyo, Japan Doctoral Student Asian Institute of Technology (AIT) Bangkok, Thailand +66-8-7676-5616 _____ From: conservation...@btinternet.com To: geoma...@live.com Subject: RE: [R-sig-Geo] Package for Classification???? Date: Tue, 16 Nov 2010 16:21:36 +0000 Dear Malik, Using the GRASS-R interface would seem to be a sensible route. See: http://cran.r-project.org/web/packages/spgrass6/index.html http://grass.fbk.eu/statsgrass/grass6_r_install.html Best wishes, Lucy Dr Lucy Tallents Assistant Coordinator, PG Dip in International Wildlife Conservation Practice Wildlife Conservation Research Unit (WildCRU) Zoology, University of Oxford The Recanati-Kaplan Centre Tubney House, Abingdon Road Tubney, Abingdon OX13 5QL, UK T +44 (0) 1865 611125 F +44 (0) 1865 611101 M +44 (0) 7763 378147 <http://www.wildcru.org/diploma> www.wildcru.org/diploma From: r-sig-geo-boun...@stat.math.ethz.ch [mailto:r-sig-geo-boun...@stat.math.ethz.ch] On Behalf Of Malik Shahzad Sent: 16 November 2010 16:16 To: R Help Subject: [R-sig-Geo] Package for Classification???? Dear I want to know a good package for Raster data classification ( Supervised & Unsupervised).Thanks in Advance... with Best Regards, Malik Shahzad Visiting Researcher National Institute of Informatics (NII) Tokyo, Japan Doctoral Student Asian Institute of Technology (AIT) Bangkok, Thailand +66-8-7676-5616 [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo _____ No virus found in this message. Checked by AVG - www.avg.com [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
