i know i can churn out raster statistics with r.report in GRASS GIS and QGIS, but what i want is the statistics of manually-defined categories of pixel ranges.
what i have is a clipped raster (of a single band) with a range of values that has not been classified. i only know how to categorize the pixels by going to the style tab, and what i want is a count of pixels in each category that i have defined.
to elaborate further, i about ~80,000 pixels and a maximum pixel value of ~25. i want to categorize my pixels like this:
(1) no value - pixel value range 0.0 - 1.5 (2) low value - pixel value range 1.6 - 6.5 (3) medium value - pixel value range 6.6 - 15.0 (4) high value - pixel value range 15.1 - 25.0
now i want a count of the number of pixels in each category. how do i produce that statistical report? i tried the "zonal raster statistics" tool but there's something amiss here. (See attached image for an idea of what i get with a simple r.report of my raster)
I am an amateur in GIS!