Just to add what Alex mentioned already, here a link for GRASS Image classification (how to).
http://grass.osgeo.org/wiki/Image_classification In reference to these works, * Micha Silver: Analyzing acacia tree health in the Arava with GRASS GIS * Perrygeo: Impervious surface deliniation with GRASS * Dylan Beaudette: Working with Landsat Data * Dylan Beaudette: Canopy Quantification via Image Classification Noli On 1/5/11, Alex Mandel <tech_...@wildintellect.com> wrote: > One might argue that slippy maps and tile caches have added a lot of > value to raster data or at least demand. > > But more directly on the topic in addition to GDAL. > GRASS http://www.perrygeo.net/wordpress/?p=104 > See pg 115+ from Open Source GIS A GRASS Approach (Neteler, Mitasova) > > More generically aside from extraction, there's combinatorial calculation: > Calculation of NDVI for vegetation analysis (NIR and Red bands) > Looking for fires in MODIS data (Thermal band math) > Watershed flows from DEMs > Solar radiation analysis (Think solar panel placement) > etc. > > Specifically it sounds like you're talking about Unsupervised/Supervised > classification > > A lot of these can be done with any RASTER based analysis application. > > So SAGA has some tools, and I can't quite remember but INPE in Brazil > was working on some FOSS Image classification software too. > > Thanks, > Alex > > On 01/04/2011 03:52 PM, Landon Blake wrote: >> I'm working on a magazine article for ACSM Bulliten entitled "Creating >> Value From Raster Data". The target audience will be land surveyors. I >> was hoping some of the OSGeo guys would be able to help me with a few >> questions as I do my research for the article: >> >> >> >> - Are there any open source alternatives to automated feature >> creation from raster data, such as is possible with ENVI >> (http://www.ittvis.com/ProductServices/ENVI.aspx) ? >> >> - Does anyone know of research or work being done with the >> development of open source algorithms and programming libraries to >> enable automated feature creation from raster data? >> >> - Can you think of ways to create value from raster data other >> than extraction of vector features? >> >> >> >> Thanks for any suggestions and information. >> >> >> >> Landon >> > > _______________________________________________ > Discuss mailing list > Discuss@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/discuss > _______________________________________________ Discuss mailing list Discuss@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/discuss
