[GRASS-user] Something wrong: Reprojection of raster maps in various platforms: projected coordinates are different

[Uttam Kumar]

Thank you all for the suggestions.

I could resolve the problem.

GRASS gives me same projected coordinates as ENVI.



On Fri, Oct 23, 2015 at 12:46 AM, Markus Neteler <neteler at osgeo.org> wrote:

>
> On Oct 23, 2015 2:22 AM, "Uttam Kumar" <uttamsinha09 at gmail.com> wrote:
>
> ...
> > GRASS 7.1.svn (SanLuis_Reservoir_LAEA):~ > v.info -g Image_boundary_box
> >
> > north=823262.924419209
> > south=652223.643294404
> > east=-167210.022680164
> > west=-518209.054236328
> > top=0.000000
> > bottom=0.000000
> >
> >
> > I should have got this (This is correct):
> >
> > north:1638674.575
> > south:1481984.575
> >
> > east:1157941.598
> > west:817651.598
> >
> > Any clue, where am I wrong?
>
> You appear to compare the vector bounding box which easily leads to
> misleading results in case of a rotated image.
> The only correct way is to compare point wise (eg true corner points of
> the image scene).
>
> 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.
>
> Best
> Markus
>
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