Is there a way to extract vegetation coverage or even basic land use from general aerial/sat. imagery?
I'm looking for one of or all of the following as an end result:
-identifying cropland vs forest land as polygons to be used with representations similar to to this http://mappingcenter.esri.com/index.cfm?fa=ask.answers&q=268
-extracting center point locations of individual trees to be symbolized using marker symbols
-creating a 'vegetation mask' as proposed for use in your tutorial for bump maps
Mapping Center Answer:
The tools you need to use are in the Spatial Analyst tools in ArcGToolbox. In the set of Multivariate tools, you will find tools that allow you to perform a supervised or unsupervised classification. In a supervised or unsupervised classification, the steps are:
- Create a multiband collection.
- Create the classes or clusters (using ClassSig, Create Signatures, Iso Cluster, or Sample).
- Evaluate and edit the classes or clusters (Dendrogram and Edit Signatures).
- Perform the classification (Maximum Likelihood Classification and ClassProb).
The two tools you will want to use in particular are Isocluster and Maximum Likelihood Classification. The help topic titled "Performing the classification" (in the help doc that relates to Multivariate Statistical Analysis) explains more about supervised and unsupervised classification.
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