Hi Preethi,
First of all, you do not need to use the DEMConvert application anymore.
Simply put DEM.tif in a directory and set it as -elev.dem parameter.
Second, depending on your DEM convention, you also need to set a geoid
file to get accurate results.
Last, the output image is not supposed to be in the same SRS as the DEM.
In fact the output SRS is tuned with the -map parameter. By default it
will use the closest UTM zone. If you want to use a specific SRS, you
can set it by its EPSG code : -map epsg -map.epsg 2157
Hope that helps,
Regards,
Julien
Le 12/09/2017 à 11:08, preet.balaji20 a écrit :
Dear all,
I am trying to orthorectify Sentinel-1 GRD Radiometric calibrated
C-band SAR image using EU digital elevation model of 30m resolution
using the command in Linux terminal
*otbcli_OrthoRectification -io.in SARimage.tif -io.out outputimage.tif
-elev.dem /DEMdirectory. *
The DEM used was reprojected to Irish Transverse Mercator – epsg:2157.
The DEM.tif file was converted to general raster file compatible with
the OTB DEM handling using the DEMconvert option. Three files with the
extensions .ras, .geom and .omd were saved in the dem directory - this
directory was given as input for orthorectification
*DEM file information:*
Size is 9663, 7541
Coordinate System is:
PROJCS["IRENET95 / Irish Transverse Mercator",
GEOGCS["IRENET95",
DATUM["IRENET95",
SPHEROID["GRS 1980",6378137,298.2572221010002,
AUTHORITY["EPSG","7019"]],
TOWGS84[0,0,0,0,0,0,0],
AUTHORITY["EPSG","6173"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4173"]],
PROJECTION["Transverse_Mercator"],
PARAMETER["latitude_of_origin",53.5],
PARAMETER["central_meridian",-8],
PARAMETER["scale_factor",0.99982],
PARAMETER["false_easting",600000],
PARAMETER["false_northing",750000],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]],
AUTHORITY["EPSG","2157"]]
Origin = (419504.356750835664570,709074.848424524534494)
Pixel Size = (25.288322889600000,-25.288322889600000)
Metadata:
AREA_OR_POINT=Area
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( 419504.357, 709074.848) ( 10d41'44.00"W, 53d 6' 6.05"N)
Lower Left ( 419504.357, 518375.606) ( 10d35'37.23"W, 51d23'21.80"N)
Upper Right ( 663865.421, 709074.848) ( 7d 2'44.58"W, 53d 7'42.18"N)
Lower Right ( 663865.421, 518375.606) ( 7d 4'54.58"W, 51d24'52.20"N)
Center ( 541684.889, 613725.227) ( 8d51'16.06"W, 52d16'19.64"N)
Band 1 Block=9663x1 Type=Float32, ColorInterp=Gray
NoData Value=0
It seems that the DEM is not being considered as an input here. The
ouput image has the default projection – UTM zone 29. But it is
supposed to consider the projection of the input DEM which is ITM
(2157). Please find the attached orthorectified image obtained using
the DEM files.
The Orthorectification application in OTB version 6.0.0 was also tried
which did not give the desired result.
Can somebody please help me in understanding what is it that I'm
missing/doing wrong?
I really appreciate the help.
Thanks in advance
Preethi
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CNES - DSO/SI/2A
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