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[Backport release/3.9] GRIB: adjust longitude range from [180, xxx] to [-180, xxx] #10734

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Sep 5, 2024
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[Backport release/3.9] GRIB: adjust longitude range from [180, xxx] to [-180, xxx] #10734

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Binary file added autotest/gdrivers/data/grib/minx_180.grib2
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7 changes: 7 additions & 0 deletions autotest/gdrivers/grib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2419,3 +2419,10 @@ def test_grib_grib2_template_5_42_CCDS_aes_decompression():
assert ds.GetRasterBand(1).Checksum() == 41970
else:
assert ds.GetRasterBand(1).Checksum() == -1


# https://github.com/OSGeo/gdal/issues/10655
def test_grib_grib2_minx_180():
ds = gdal.Open("data/grib/minx_180.grib2")
gt = ds.GetGeoTransform()
assert gt == pytest.approx((-180.0625, 0.125, 0.0, 90.0625, 0.0, -0.125), rel=1e-6)
7 changes: 7 additions & 0 deletions frmts/grib/gribdataset.cpp
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Expand Up @@ -2681,6 +2681,13 @@ void GRIBDataset::SetGribMetaData(grib_MetaData *meta)
if (rPixelSizeX * nRasterXSize > 360 + rPixelSizeX / 4)
CPLDebug("GRIB", "Cannot properly handle GRIB2 files with "
"overlaps and 0-360 longitudes");
else if (rMinX == 180)
{
// Case of https://github.com/OSGeo/gdal/issues/10655
CPLDebug("GRIB", "Shifting longitudes from %lf:%lf to %lf:%lf",
rMinX, rMaxX, -180.0, Lon360to180(rMaxX));
rMinX = -180;
}
else if (fabs(360 - rPixelSizeX * nRasterXSize) < rPixelSizeX / 4 &&
rMinX <= 180 && meta->gds.projType == GS3_LATLON)
{
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