[otb-users] Stereo processing using OTB for DEMOIS-2

[Ramya Mns]

Hello Sir,

I am trying to stereo process the stereo pair using OTB. The actual
elevation of the area ranges between 300-600 m. When I processed stereo for
full image I got the same elevation ranges. but for subset Im getting very
low values between 20-100m. Actually stereo processing for full image
taking lot of time approx 24 hrs. Which makes difficult to analyse
different parameters. Please suggest better option to analyse.

The DEM is having lot of no data values after converting disparity to
elevation map. Is there any technique in OTB to fill the data.
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[Guillaume Pasero]

[Ramya Mns]

I extracted subset using the command "otbcli_ExtractROI"

On Thursday, November 8, 2018 at 2:46:53 PM UTC+5:30, Guillaume Pasero

Hi,
It looks like the subsets you used don't have a correct localisation. What
did you use to make the subsets?
To enhance the disparity map, you can try the median filtering option.
When you convert the disparity map into a DEM, you should also keep in mind
that setting a DEM pixel size larger than the original sampling distance
will allow to compute elevation at each pixel using several 3D points. If
you set the DEM pixel size to exactly the resolution of the input image,
you will have a lot of cells with 1 or 0 3D point inside.
Regards,
Guillaume
Hello Sir,
I am trying to stereo process the stereo pair using OTB. The actual
elevation of the area ranges between 300-600 m. When I processed stereo for
full image I got the same elevation ranges. but for subset Im getting very
low values between 20-100m. Actually stereo processing for full image
taking lot of time approx 24 hrs. Which makes difficult to analyse
different parameters. Please suggest better option to analyse.
The DEM is having lot of no data values after converting disparity to
elevation map. Is there any technique in OTB to fill the data.
--
--
Check the OTB FAQ at
http://www.orfeo-toolbox.org/FAQ.html
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<http://www.c-s.fr> *Guillaume PASERO*
Responsable technique
*Business Unit ESPACE & GeoInformation - Département Payload Data &
Applications*
*CS SystÚmes d'Information*
Parc de la Grande Plaine - 5, Rue Brindejonc des Moulinais - BP 15872
31506 Toulouse Cedex 05 - FRANCE

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[Ramya Mns]

Thanks for the response.

I extracted the subset using the command "otbcli_ExtractROI" for both
images in stereo pairs


On Thursday, November 8, 2018 at 2:46:53 PM UTC+5:30, Guillaume Pasero

Hi,
It looks like the subsets you used don't have a correct localisation. What
did you use to make the subsets?
To enhance the disparity map, you can try the median filtering option.
When you convert the disparity map into a DEM, you should also keep in mind
that setting a DEM pixel size larger than the original sampling distance
will allow to compute elevation at each pixel using several 3D points. If
you set the DEM pixel size to exactly the resolution of the input image,
you will have a lot of cells with 1 or 0 3D point inside.
Regards,
Guillaume
Hello Sir,
I am trying to stereo process the stereo pair using OTB. The actual
elevation of the area ranges between 300-600 m. When I processed stereo for
full image I got the same elevation ranges. but for subset Im getting very
low values between 20-100m. Actually stereo processing for full image
taking lot of time approx 24 hrs. Which makes difficult to analyse
different parameters. Please suggest better option to analyse.
The DEM is having lot of no data values after converting disparity to
elevation map. Is there any technique in OTB to fill the data.
--
--
Check the OTB FAQ at
http://www.orfeo-toolbox.org/FAQ.html
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--
<http://www.c-s.fr> *Guillaume PASERO*
Responsable technique
*Business Unit ESPACE & GeoInformation - Département Payload Data &
Applications*
*CS SystÚmes d'Information*
Parc de la Grande Plaine - 5, Rue Brindejonc des Moulinais - BP 15872
31506 Toulouse Cedex 05 - FRANCE

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http://www.orfeo-toolbox.org/FAQ.html

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