Feature Extraction - object based image analysis
If, by 'feature extraction', the colleague refers to classifying the raster imagery pixels into discrete categores (e.g., vegetation types), I would suggest looking at the 'r.' and 'i.' components of GRASS GIS, which of course integrates well with R. Hope this helps. Rick R
Rawlins, Barry G wrote:
I have a colleague who is not familiar with R and we were discussing feature extraction from multiple images (air photos, satellite based etc.). He uses a commercial tool for feature extraction. Can anyone point me to a package in R that does this? I have done a search but not found such a function. It is not a procedure I am familiar with. Many thanks, Barry Dr Barry Rawlins Sustainable Soils Team Leader British Geological Survey Keyworth Nottingham NG12 5GG Direct tel: 0115 9363140 Mobile: 0788 4235473 homepage: http://barryrawlins.googlepages.com<http://barryrawlins.googlepages.com/>
Rick Reeves Scientific Programmer/Analyst and Data Manager National Center for Ecological Analysis and Synthesis UC Santa Barbara www.nceas.ucsb.edu 805 892 2533