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<div class="h5">And if you want to improve the output, then two steps:<br>First use r.category to give a label to each category like so:<br>(assuming the first is black)</div></div></blockquote></blockquote>
<div>This is what I am not sure, I only get the number respent the category,but I am not sure what it stand for,for example the number in first line:9321,does it stand for red? or blue?</div>
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<div class="h5"><span></span><br>echo "0:Black" | r.category outss rules=-<br>(note the '-' which means "read from stdin")<br>Next use r.report like so:<br>r.report outss unit=k<br>(gives a table with the cat value, the label and area in sqkm) </div>
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