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Nix Geospatial Team

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Nix Geospatial packages maintenance. Team board - https://github.com/orgs/NixOS/projects/47/views/18 Servers

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22 Feb 2024
@imincik:matrix.orgIvan Mincik (imincik)

What about trying tiffinfo to check which compression is enabled

./result-bin/bin/tiffinfo ~/Projects/osgeo/qgis/code/tests/testdata/raster_layer.tiffTIFFReadDirectory: Warning, Unknown field with tag 33550 (0x830e) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 33922 (0x8482) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 34735 (0x87af) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 34736 (0x87b0) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 34737 (0x87b1) encountered.
=== TIFF directory 0 ===
TIFF Directory at offset 0x67b86 (424838)
  Image Width: 337 Image Length: 315
  Resolution: 36, 36 pixels/inch
  Bits/Sample: 8
  Compression Scheme: None
  Photometric Interpretation: RGB color
  Extra Samples: 1<unassoc-alpha>
  Orientation: row 0 top, col 0 lhs
  Samples/Pixel: 4
  Rows/Strip: 6
  Planar Configuration: single image plane
  Tag 33550: 0.146439,0.146439,0.000000
  Tag 33922: 0.000000,0.000000,0.000000,-124.091282,56.207996,0.000000
  Tag 34735: 1,1,0,7,1024,0,1,2,1025,0,1,1,2048,0,1,4326,2049,34737,7,0,2054,0,1,9102,2057,34736,1,1,2059,34736,1,0
  Tag 34736: 298.257224,6378137.000000
  Tag 34737: WGS 84|
09:25:42
@imincik:matrix.orgIvan Mincik (imincik) tiffinfo contains Compression Scheme: None field 09:26:26
@vengmark2:matrix.orgl0b0 I did verify using that, but I don't know of any good TIFFs I could use for the test. Ideally I'd use libtiff to create a 1x1 LERC TIFF and then read its info, but libtiff doesn't seem to come with CLI tools to create TIFFs. 09:26:50
@vengmark2:matrix.orgl0b0 * I did verify using that (or one of the other executables included in libtiff; I don't remember), but I don't know of any good TIFFs I could use for the test. Ideally I'd use libtiff to create a 1x1 LERC TIFF and then read its info, but libtiff doesn't seem to come with CLI tools to create TIFFs. 09:27:51
@vengmark2:matrix.orgl0b0Thank you for the help, by the way!09:28:30
@imincik:matrix.orgIvan Mincik (imincik)
In reply to @vengmark2:matrix.org
I did verify using that (or one of the other executables included in libtiff; I don't remember), but I don't know of any good TIFFs I could use for the test. Ideally I'd use libtiff to create a 1x1 LERC TIFF and then read its info, but libtiff doesn't seem to come with CLI tools to create TIFFs.
Then use gdal to create the tiff file. 		09:30:20
@vengmark2:matrix.orgl0b0I was going to say that would take 100x the build time, but of course the libtiff tests already include the GDAL test suite. 🤔 OK, I'll give it a shot.09:31:09
@vengmark2:matrix.orgl0b0 * I was going to say that would take 100x the build time, but of course the libtiff tests already include the GDAL test suite. 🤔 OK, I'll give it a shot. Tomorrow. 💤09:31:49
@imincik:matrix.orgIvan Mincik (imincik)
In reply to @imincik:matrix.org
Then use gdal to create the tiff file.

Something like

gdal_create -outsize 10 10 -co COMPRESS=LERC_DEFLATE test.tif
09:34:44
@imincik:matrix.orgIvan Mincik (imincik)

gdalinfo works as well

with gdal: Test LERC support #290292 I am able to do:

nix-build -A gdal

./result/bin/gdal_create -outsize 10 10 -co COMPRESS=LERC_DEFLATE test.tif

./result/bin/gdalinfo test.tif
Driver: GTiff/GeoTIFF
Files: test.tif
Size is 10, 10
Image Structure Metadata:
  COMPRESSION=LERC_DEFLATE
  INTERLEAVE=BAND
  LERC_VERSION=2.4
Corner Coordinates:
Upper Left  (    0.0,    0.0)
Lower Left  (    0.0,   10.0)
Upper Right (   10.0,    0.0)
Lower Right (   10.0,   10.0)
Center      (    5.0,    5.0)
Band 1 Block=10x10 Type=Byte, ColorInterp=Gray
09:52:58
@imincik:matrix.orgIvan Mincik (imincik)I've submitted a Nix talk for FOSS4G Europe conference. Please vote for the talk if you want to help me to be accepted - https://talks.osgeo.org/foss4g-europe-2024/p/voting/signup . Talk title is "Can we use Nix as a default way of distributing geospatial software ?" (second page of the list). Thanks ! 12:34:36
@imincik:matrix.orgIvan Mincik (imincik) New approach of proj-data integration to proj - https://github.com/NixOS/nixpkgs/pull/290643 . I am finally happy with that. 17:29:23
@vengmark2:matrix.orgl0b0
In reply to @imincik:matrix.org
So many issues in those few instructions in elevation README :)
Do you have some specific suggestions? I'd love to improve this process for the team. 		20:30:45
@vengmark2:matrix.orgl0b0 Would it be useful to add enable* ? true parameters for each of the optional dependencies, in case someone wants a minimal libtiff? Or is that too much control? 20:40:16
@imincik:matrix.orgIvan Mincik (imincik)
In reply to @vengmark2:matrix.org
Would it be useful to add enable* ? true parameters for each of the optional dependencies, in case someone wants a minimal libtiff? Or is that too much control?
Not for now. Not until somebody needs that. 		20:41:55
23 Feb 2024
@timlinux:matrix.orgTim Sutton joined the room.14:34:45

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