Hi Julien, Thanks very much for your suggestions. I am trying to download geoid files, do you know from where I can download the files? I tried this - http://hg.orfeo-toolbox.org/OTB-Data/raw-file/404aa6e4b3e0/Input/DEM/egm96.grd, but the page is not working.
Thanks and Regards Preethi On Tuesday, September 12, 2017 at 10:17:33 AM UTC+1, Julien Michel wrote: > > Also note that you should change the default -opt.gridspacing value (in > meters) to something like twice the resolution of your DEM or so > (otherwise ortho-recitification will take forever to complete). > > Regards, > > Julien > > Le 12/09/2017 à 11:08, Julien Michel a écrit : > > 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 > >> > >> -- > >> -- > >> Check the OTB FAQ at > >> http://www.orfeo-toolbox.org/FAQ.html > >> > >> You received this message because you are subscribed to the Google > >> Groups "otb-users" group. > >> To post to this group, send email to [email protected] > <javascript:> > >> To unsubscribe from this group, send email to > >> [email protected] <javascript:> > >> For more options, visit this group at > >> http://groups.google.com/group/otb-users?hl=en > >> --- > >> You received this message because you are subscribed to the Google > >> Groups "otb-users" group. > >> To unsubscribe from this group and stop receiving emails from it, > >> send an email to [email protected] <javascript:> > >> <mailto:[email protected] <javascript:>>. > >> For more options, visit https://groups.google.com/d/optout. > > > > > > > -- > Julien MICHEL > CNES - DSO/SI/2A > > -- -- Check the OTB FAQ at http://www.orfeo-toolbox.org/FAQ.html You received this message because you are subscribed to the Google Groups "otb-users" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/otb-users?hl=en --- You received this message because you are subscribed to the Google Groups "otb-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
