<div>Dear List,</div>
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<div>We are currently working on normalising some landsat scenes using a topographic and illumination correction. </div>
<div>We have calculated the solar incidence angle using a dem and r.sun. We are now looking to calculate the existance angle for Landsat. Has anybody have advice on how to calculate this using r.mapcalc or other functions. </div>
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<div>Thank you in advance.</div>
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<div>cheers</div>
<div>Andrew Haywood</div>
<div>(australia)</div>