Hi all,

I have tried to merge 10 different spd files and I got some problems with
spdmerge but no only. All those files were translated from LAS to SPD in the
same way, and all the las files come from the same flight. I checked all the
files were together within the same region and, in fact, they are consecutives
tiles forming a row. 

The first problem I found is at merging. This command 
spdmerge -x FIRST_RETURN -f SPD -o merge.spd '10_files.spd' 

gives me this error: 
"Error: '9th file' was not compatiable with the file(s) previously read"

I cannot understand why that file is not compatible with the other 9 files. What
does it mean "not compatible"? 

I left out the 9th and 10th (in order to avoid data gaps) and spdmerge worked
without error. However, once I managed to merge the files I tried to obtain a
terrain classification and an interpolation with spdmpfgrd and spdinterp,
respectively. Both of them gave me same error:
"Error: The overlap must be smaller than the block size in both axis'"

when running the most basic commands: 

spdinterp --in NEAREST_NEIGHBOR --dsm --topo -i merge.spd -o merge_interp.spd
spdpmfgrd -i merge.spd -o merge_pmf.spd

Besides, if I set different values for --overlap (size in bins of the overlap) 
or -r
(no. of rows) or -c (no. of cols) nothing changes, except for this error in
spdinterp:

"ERROR 1: Attempt to create 0x0 dataset is illegal,sizes must be larger than 
zero.
Error: Failed to create image interp/merge_interp.spd"

and this other in spdpmfgrd:

Using native resolution for processing
Error: H5Screate_simple failed

I guess all these errors are related with spdmerge, because I cannot reproduce
any of them with single tiles.

Any clue/advice/hint/aclaration is welcome.   

Regards,
Roberto.

-- 
Roberto Antolín
http://twitter.com/#!/tolanss

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