<div>hi all,</div>
<div>I have downloaded usgs srtm data from the esdi site in geoTiff format.</div>
<div>I next loaded it in grass and then created a slope map from it.</div>
<div>It shows values are in range from 0 to 86.0636.</div>
<div>next I used r.mapcalc with the expression</div>
<div> r.mapcalc new=if( slopeoriginal<= 20)</div>
<div>to findout all areas which have less than 20 degrees of slope . It returned nothing.</div>
<div>I tried with all values between 20 and 90 , no output ?!?!? atleast values >=87 should have made a copy of the old </div>
<div>dem into the new . Isn't it ?</div>
<div>can someone help me out.</div>
<div>nishith</div>
<div> </div>