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

[Uttam Kumar]

You are right. The scene belongs to a small area near Central California
region.

I have available image boundary in SINUSOIDAL projection in vector format
(shp file). How do I share this to grass users ?

On Thu, Oct 8, 2015 at 12:36 PM, Uttam Kumar <uttamsinha09 at gmail.com> wrote:

>
>
> Hi All,
>
> This is the projection information of a single Landsat scene in ENVI,
> GRASS and using gdalwarp. GRASS and gdalwarp gave somewhat similar output
> but ENVI is totally different. I have been informed that the projected
> image from ENVI is correct as verified from the earlier work.
>
> Original data (in Sinusoidal Projection)
> ------------------------------------------------------
> Corner Coordinates:
> Upper Left  (-10801805.198W, 4130102.079N)
> Lower Left  (-10801805.198W, 3971252.079N)
> Upper Right (-10642955.198W, 4130102.079N)
> Lower Right (-10642955.198W, 3971252.079N)
>
>
> Reprojected in GRASS GIS (Lambert Azimuthal Equal Area, Datum: WGS84)
>
> ----------------------------------------------------------------------------------
> N:    5564460
> S:    5185590                        |
> E:   -5451390
> W:  -5762490
>
> Reprojected in ENVI (Lambert Azimuthal Equal Area, Datum: WGS84)
> -------------------------------------------------------------------------
> Corner Coordinates:
>
> Upper Left  (-2265106.681W, 1064601.383N)
> Lower Left  (-2265106.681W,  830181.383N)
> Upper Right (-1960126.681W, 1064601.383N)
> Lower Right (-1960126.681W,  830181.383N)
>
> Reprojected using gdalwarp (Lambert Azimuthal Equal Area, Datum: WGS84)
>
> ----------------------------------------------------------------------------------
> Corner Coordinates:
> Upper Left  (-5148766.236W, 3000477.570N)
> Lower Left  (-5148766.236W, 2724274.973N)
> Upper Right (-4826973.503W, 3000477.570N)
> Lower Right (-4826973.503W, 2724274.973N)
>
> Any comment is appreciated.
>
> Uttam.
>
>
> On Sun, Sep 27, 2015 at 1:48 AM, Markus Neteler <neteler at osgeo.org> wrote:
>
>>
>> On Sep 26, 2015 1:00 AM, "Uttam Kumar" <uttamsinha09 at gmail.com> wrote:
>> >
>> > Thank you all. It worked.
>> >
>> > However I noticed that the projected boundary values of N, S, W and E
>> in GRASS are not same as the values obtained from projecting the same image
>> in ENVI image processing software and in gdalwarp.
>> >
>> > Projection of the scene in Lambert Azimuthal Equal Area is similar (but
>> not exactly equal) in GRASS and gdal, but in ENVI it is totally different.
>> I just did the comparison to see if things are similar from different
>> softwares in case they have to be ported to other platforms.
>>
>> Can you print the projection information in both GRASS (g.proj -p or -w)
>> and ENVI? Are they really the same?
>>
>> Markus
>>
>
>
>
>
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