<p dir="ltr"><br>
On Oct 23, 2015 2:22 AM, "Uttam Kumar" <<a href="mailto:uttamsinha09@gmail.com">uttamsinha09@gmail.com</a>> wrote:</p>
<p dir="ltr">...<br>
> GRASS 7.1.svn (SanLuis_Reservoir_LAEA):~ > <a href="http://v.info">v.info</a> -g Image_boundary_box<br>
><br>
> north=823262.924419209<br>
> south=652223.643294404<br>
> east=-167210.022680164<br>
> west=-518209.054236328<br>
> top=0.000000<br>
> bottom=0.000000<br>
><br>
><br>
> I should have got this (This is correct):<br>
><br>
> north:1638674.575<br>
> south:1481984.575<br>
><br>
> east:1157941.598<br>
> west:817651.598<br>
><br>
> Any clue, where am I wrong?</p>
<p dir="ltr">You appear to compare the vector bounding box which easily leads to misleading results in case of a rotated image. <br>
The only correct way is to compare point wise (eg true corner points of the image scene). </p>
<p dir="ltr">Or generate a binary data/no data raster from a channel using r.mapcalc and then r.to.vect to make it a vector polygon truly circumscribing the image which can then be reprojected.</p>
<p dir="ltr">Best<br>
Markus</p>