Hi OTB uses,
I would like to share my experience and raise some Q' regard the process of
extraction DSM from Pleiades Stereo Model
This is my first step toward change detection between Pleiades fresh
imagery & existing geo-data-base
0) OS - Win 7 - 64bit
1) I have Pleiades Regular Stereo Model
2) I extracted ROI of 4000 x 4000 pixels for the left and then I created
ROI with -mode.fit option for the right (according to best practice).
3) I started with StereoFramework, and after it crashed I followed section
3.6 step by step and I successfully generated DSM file.
4) Although there are some typo errors (e.g -
in otbcli_StereoRectificationGridGenerator the -io.outimage1 should
be -io.outleft) the process went fine.
*Q-1* - it is stated that otbcli_BlockMatching creates by default a two
bands image : the horizontal and vertical disparities. When I look at the
image (e.g. disparity_map_ncc.tif) with Monteverdi I see 3 bends and
amplitude.
bend 1 has values between -43 to 5
bend 2 is empty
bend 3 looks like disparity map with proper NCC values 0.5 to
0.98 (I think that this is the horizontal)
bend 4 (named amplitude) has values between 0 to 40
In the step of filtering the NCC values (p. 81) , the example only shows
how to filter horizontal (bend 3) then concatenate thresholded horizontal &
vertical disparities...
However - I cannot figure out where the vertical disparity resides ?
==================================
*Q-2* - Is it correct' or essential for accurate DSM and ortho' to follow
chapter 3.2.5 Residual registration (between the two stereo images) before
the DSM extraction ?
Thanks in advanced ...
Ofer
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