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Have a look at the QGIS User Guide . EDIT : At the pages 129-130 (in the section 12.5.8 Working with the Attribute Table), you'll find all the user interface buttons you need to update the attribute table. If you want to update the Attribute Table with Expressions, you'll find a complete list starting at page 110 (section 12.4 Expressions).
Here is an example using R and a hyperspectral AVIRIS image of the Kennedy Space Centre which is provided for testing spatial classifications. ## required packages for spatial data random forest analysis require(raster) require(rgdal) install.packages("randomForest") require(randomForest) ## download the aviris data ...
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