I want to detect urban green areas in Google Earth imagery, using R. I've already downloaded contiguous images and assembled them into a larger image.
The above PNG image has 800x769 pixels, but the original has 6400x6150. When I open it in R, using
png library (and
readPNG function), I get a matrix with three layers, containing the red, green and blue channels (same as with Gimp).
I want to know if it's feasible to extract only the green areas (areas with native vegetation) - so that later I can transform them into shapefile polygons or raster masks. Note that some areas with native vegetation are more brown than green (savanna type vegetation), and a big green area on the northern half of the map correspond to a lake.
I know that's usually done with non-visible bands of satellite spectrum, but I want to know if I can do this with vanilla Google Earth.