NAC orthoimage problem

[Daniel Berman]

I'm having a problem with an LRO NAC pair. I followed the procedure outlined in section 8.7 of the manual, using stitching. I ran parallel_stereo on the pair, then ran point2dem and made the dem and orthoimage. I was happy with the results, so I then ran pc_align and aligned the dem to LOLA shots. It worked fine, so I tried to run point2dem again with --orthoimage, using the -L.tif texture file as usual, and got this:

ERROR: Point cloud M1458121567LE_M1458128588LE-DEMalign-trans_reference.tif and texture file M1458121567LE_M1458128588LE-L.tif do not have the same dimensions.

This was my input:

point2dem M1458121567LE_M1458128588LE-align-trans_reference.tif --orthoimage -n --errorimage M1458121567LE_M1458128588LE-L.tif -o M1458121567LE_M1458128588LE-align

Any help would be appreciated!

[Oleg Alexandrov]

What happens here is that when you create a DEM, the number of rows and columns is no longer as in the point cloud. Then, pc_align produces an aligned cloud, but it has the same dimensions as the DEM, rather than as the input point cloud. 

So, point2dem cannot function with the L.tif that is 1-to-1 with the PC.tif before being gridded with point2dem.

I guess what you can do is:

 - Use pc_align with the input PC.tif, before gridding with point2dem, then the output of pc_align will have the same dimensions.

Or:

 - Create the orthoimage with point2dem with the original cloud, producing a DRG, then use pc_align as now, get a point cloud which would have the same dimensions as the DEM (I hope), which has the same dimensions as the DRG, then call point2dem with this DRG instead of L.tif.

I did not test this, but given that the problem is with mismatch in size, it should work. I don't recall now if point2dem will be happy enough to accept the DRG.tif instead of L.tif if called with the --orthoimage run/run-DRG.tif option, or if one has to first rename DRG.tif to L.tif.

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[Daniel Berman]

Thanks! The second option worked using the DRG in pc_align. I did not have to change the name.