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Fix geoid and gravity anomaly layers' nodata value in overviews #712

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merged 3 commits into from
Aug 8, 2023
Merged

Fix geoid and gravity anomaly layers' nodata value in overviews #712

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6a8b1b0
Fix geoid and gravity anomaly layers' nodata value in overviews
trey-stafford Aug 8, 2023
eb923b4
Update CHANGELOG
trey-stafford Aug 8, 2023
969a0f6
Add reference to gdal issue
trey-stafford Aug 8, 2023
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5 changes: 5 additions & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -177,6 +177,11 @@
- Switch back to `.qgs` project file from `.qgz`; There is [an
issue](https://github.com/qgis/QGIS/issues/42033) conveniently opening `.qgz`
project files in OSX for some versions of QGIS `3.16.x`.
- Fix issue with "Geophysics/" layers displaying nodata values at some zoom
levels:
- "Bouguer gravity anomaly (2km)"
- "Faye (free-air) gravity anomaly (2km)"
- "Geoid model (2km)"


# v2.0.0rc6 (2022-03-17)
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6 changes: 6 additions & 0 deletions qgreenland/config/cfg-lock.json
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Expand Up @@ -18394,6 +18394,8 @@
"EPSG:3413",
"-r",
"bilinear",
"-dstnodata",
"-9999",
"-tr",
"2000",
"2000",
Expand Down Expand Up @@ -18485,6 +18487,8 @@
"EPSG:3413",
"-r",
"bilinear",
"-dstnodata",
"-9999",
"-tr",
"2000",
"2000",
Expand Down Expand Up @@ -18576,6 +18580,8 @@
"EPSG:3413",
"-r",
"bilinear",
"-dstnodata",
"-9999",
"-tr",
"2000",
"2000",
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6 changes: 6 additions & 0 deletions qgreenland/config/helpers/layers/gravity_anomalies_geoid.py
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Expand Up @@ -38,6 +38,12 @@ def _make_layer(
input_file="{input_dir}/" + filename,
output_file="{output_dir}/" + filename,
reproject_args=[
# The source nodata value is 1.70141e+38. This value is not
# correctly set in the overviews (added in the step below),
# so override it here as -9999. See
# https://github.com/OSGeo/gdal/issues/8187.
"-dstnodata",
"-9999",
# Source data is 0.02x-0.02 degrees resolution. Rene noted in
# his email to QGreenland on 2021-01-22 that the geoid and
# gravity anomaly grids are 2km resolution.
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