Hi Chris,
When dealing with sensor images (without ProjRef), the origin and
spacing are used to locate the image in the full product. If you do an
extract of a full product and that its position is stored in the origin,
you can apply the same RPC because the column/row that will be given to
the RPC won't start at (0,0) but at the start of your ROI.
If it doesn't work, check that the origin is correctly set with respect
to the full product, and also check that the two extracts actually overlap.
Regards,
Guillaume
Le 13/08/2014 05:29, Chris a écrit :
Hi Jonathan,
Thank you for the reply.
If extracROI is the right way to crop the image, then why my entire
image can be successfully matched, whereas the subset image extracted
by "extractROI" cannot match?
If the entire image and its subset share a same RPC file, but with
different origins, then how OTB can recognize that the image has been
changed? At least the *column/row OFFSET* need to be reset in the RPC?
Can I alternative modify the RPC file and let OTB read the
user-defined RPC file? I fail to do this, when I modify the
"*RPC_###.xml*" comes with the entire image, and use it for the subset
image, by: /otbcli_command "Subset_Image.tif?&RPC_user_defined.XML"/
Thank you,
Chris,
On Tuesday, August 12, 2014 5:38:20 AM UTC-4, Jonathan Guinet wrote:
Hi Chris,
using extractROI on your sensor image affects the origin of the
image, thus the RPC model remains valid, (it can be easilly
checkerd unsing gdalinfo)
Cheers,
Jonathan
2014-08-11 20:02 GMT+02:00 Chris <[email protected] <javascript:>>:
Hi,
I have been attempted to use OTB stereo image matching since
2012, not got a chance to really let it work. And this time I
involved in much more time and it seems on the right track now.
I have previously post about OTB installation
<https://groups.google.com/forum/#%21searchin/otb-users/stereo$20framework/otb-users/wANoQ9oHhss/e-ZIQwpfnd0J>
and
stereo matching
<https://groups.google.com/forum/#%21profile/otb-users/APn2wQcDet7yykx6xh3fe498XOY19WsE1RahsL9BXiAXF1uKl8kubFdNmTygPJ0uJ1yemTMFJvwn/otb-users/kocntH7LjO8/lQfHi2maLQMJ>
problems
I have encountered. and I have checked some related post to my
work, such as here
<https://groups.google.com/forum/#%21searchin/otb-users/stereo$20framework/otb-users/xEoAwafKjCQ/MYq0XcAtyRMJ>:
I have a few issues:
1.
I *can now successfully *match an entire tile of triple-view
Pleiades image in about 2*10e4 seconds. Please see attached
Overview for this DSM.
Due to such a long computation time, I attempt to crop the
image first then match a subset image.
The entire Pleiades tile and subset image information,
according to otbcli_ReadImageInfo, is given in the attached
"Image_information_list.md".
#image subsetting
./otbcli_ExtractROI -in
/path/to/my/Pleiades/Pan/image/759.TIF -startx 1000
-starty 1000 -sizex 2000 -sizey 2000 -out
../../SubsetPleaides/Test_pan_759.tif
./otbcli_ExtractROI -in
/path/to/my/Pleiades/Pan/image/771.TIF -startx 1000
-starty 1333 -sizex 2000 -sizey 2000 -out
../../SubsetPleaides/Test_pan_771.tif
#stereo matching framework
./otbcli_StereoFramework -input.il <http://input.il>
"Test_pan_759.tif" "Test_pan_771.tif" -output.res 2
-output.out Test_Pan_759_771_DSM.tif -elev.default 272
-bm.maxhoffset 120 -bm.minhoffset -120 -bm.radius 3 -ram 6000
# report error:
2014 Aug 11 13:03:30 : Application.logger (INFO)
Minimum disparity : *-1.36259e+07*
2014 Aug 11 13:03:30 : Application.logger (INFO)
Maximum disparity : *1.36259e+07*
......
Writing Test_Pan_759_771_DSM.tif...: 0% [
]otbApplicationLauncherCommandLine:
/usr/include/ITK-4.5/itkImageConstIterator.h:208: void
......
Dimension: 2
Index: [-13625856, 1321]
Size: [2123, 660]
is *outside of buffered region *ImageRegion (0xd6dd20)
Considering the entire tile can match successfully, there
should be something wrong happens during the image crop using
"otbcli_ExtractROI"
I have included the "*.geom" files (for both original large
tile, and the subset image) generated by OTB attached to this
post.
# the ".geom" of the entire tile is export through ReadImageInfo
./otbcli_ReadImageInfo -in
/path/to/my/Pleiades/Pan/image/759.TIF -outkwl
Entier_Pleiades_Tile_759.geom
# the ".geom" of the subset image is generated automatically by
./otbcli_ExtractROI -in
/path/to/my/Pleiades/Pan/image/759.TIF -startx 1000
-starty 1000 -sizex 2000 -sizey 2000 -out
../../SubsetPleaides/Subset_Pleiades_759.tif
I already compared these two *.geom files, and I notice there
are no significant changes.
What is the correct method to subset an large satellite image
for matching, preserving its RPC file?
2. What is the* supported RPC formats *for OTB in order load
geometry information correctly?
From a previous post it said RPC modules are inherited from
OSSIM, and all popular satellite formats are supported, such
as Worldview, GeoEye, etc.
The XML file comes with Pleiades image works well, but
user-defined XML after subsetting the Pleiades does not work
any more, even if in the same file name and location.
What happened underneath?
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Ingénieur d'études et développement
*Business Unit E-SPACE & Geo Information*
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APPLICATIONS*
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