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dem.py error because of wrong filename of unzipped SRTM tile (mostly over water) #750

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falkamelung opened this issue Aug 8, 2023 · 0 comments · May be fixed by #751
Open

dem.py error because of wrong filename of unzipped SRTM tile (mostly over water) #750

falkamelung opened this issue Aug 8, 2023 · 0 comments · May be fixed by #751
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@falkamelung
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dem.py can give an error because of wrong name of unzipped tile. For example

dem.py -a stitch --filling --filling_value 0 -b 37 39 48 51 -c -u https://e4ftl01.cr.usgs.gov/MEASURES/SRTMGL1.003/2000.02.11/

says:

Cannot open DEM file ./N38E050.hgt for reading.
API open (R): ./demLat_N37_N39_Lon_E048_E051.dem
API close:  ./demLat_N37_N39_Lon_E048_E051.dem
Writing geotrans to VRT for ./demLat_N37_N39_Lon_E048_E051.dem
GDAL open (R): ./demLat_N37_N39_Lon_E048_E051.dem.vrt
ERROR 1: Invalid dataset dimensions : 10800 x -1
terminate called after throwing an instance of 'std::runtime_error'
  what():  Cannot open the file ./demLat_N37_N39_Lon_E048_E051.dem.vrt in read mode.
Aborted

It does not find the file N38E050.hgt. The reason is that N38E050.SRTMGL1.hgt.zip unzips to N38E050.SRTMGL1.hgt instead of N38E050.hgt:

unzip N38E050.SRTMGL1.hgt.zip
Archive:  N38E050.SRTMGL1.hgt.zip
  inflating: N38E050.SRTMGL1.hgt

unzip N38E049.SRTMGL1.hgt.zip
Archive:  N38E049.SRTMGL1.hgt.zip
  inflating: N38E049.hgt

This gets clear from the listing of unzipped files:

 ls -l *hgt
-rw-r--r-- 1 tg851601 G-820134 25934402 Oct  8  2012 N37E048.hgt
-rw-r--r-- 1 tg851601 G-820134 25934402 Oct  8  2012 N38E048.hgt
-rw-r--r-- 1 tg851601 G-820134 25934402 Oct  8  2012 N38E049.hgt
-rw-r--r-- 1 tg851601 G-820134 25934402 Aug 10  2015 N38E050.SRTMGL1.hgt

This seems to happen primarily (possibly only) over water.

I will submit a PR that renames the unzipped tile if needed (N38E050.SRTMGL1.hgt to N38E050.hgt).
@falkamelung falkamelung linked a pull request Aug 8, 2023 that will close this issue
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@rtburns-jpl rtburns-jpl added the bug Something isn't working label Dec 29, 2023
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DemStitcher.py: fix name of wrongly named unzipped SRTM tiles falkamelung/isce2
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@falkamelung @rtburns-jpl