[gdal-dev] GDAL-Georefrencing already Georefrenced single band Raster

[sawan nikam]

Hello,

I am trying to georeference already georeferenced single band raster data
using GDAL with four GCP's.

Input image is having Coordinate system GCS- WGS1984 (EPSG:4326).
Following Command is run on command Prompt:

*"gdal_translate -of GTiff -gcp 72.4819 23.0179 72.4819 23.0179 -gcp 72.492
23.0079 72.492 23.0079 -gcp 72.4819 23.0086 72.4819 23.0086 -gcp 72.496
23.0169 72.496 23.0169 input.tiff output1.tiff*
*gdalwarp -r near -order 1 -co COMPRESS=NONE -s_srs EPSG:4326 -t_srs
EPSG:4326 output1.tiff" output.tiff"*

*Issues*:
-> After running this command on command prompt and opening output
generated file  in QGIS the output is not having the coordinate system as
EPSG:4326.

-> Image is opening somewhere else location in QGIS viewer. Hence the image
is not properly georeferenced.

-> For cross verification I ran  georefrencing tool in QGIS with same input
dataset it is giving the expected output and image is opening on exact
Geographic location.

-> For cross verification, I copied generated gdal script from QGIS and ran
again in Command Prompt and opened output  again in QGIS. The image is not
as expected.


*Questions*:
1. Is this above command is correct for georeferencing already
georeferenced data?
2. Apart from above command Is there any another internal Command QGIS
using for georeferencing image?
3. After running gdalwarp, why the output generated is not resampled and
not having mentioned coordinate system.

Waiting For your valuable response.

-- 
With Regards,

*Sawan Nikam*
*Mob: +91-9753123988*
*Mail: sawan.nikam22 at gmail.com <sawan.nikam22 at gmail.com>*
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