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Merge pull request #117 from rouault/gridshift_projected
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check_gtiff_grid.py: enhance to support grids referenced in projected…
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@rouault
rouault authored Feb 9, 2024
2 parents a810a6d + 4495fac commit c81e61e
Showing 1 changed file with 72 additions and 32 deletions.
104 changes: 72 additions & 32 deletions grid_tools/check_gtiff_grid.py
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Original file line number Diff line number Diff line change
Expand Up @@ -75,7 +75,7 @@ def get_srs(ds, epsg_code_key, wkt_key, is_first_subds, infos, warnings, errors)
return srs


def validate_horizontal_offset(type, ds, is_first_subds):
def validate_horizontal_offset(type, ds, src_crs, is_first_subds):

infos = []
warnings = []
Expand All @@ -84,8 +84,12 @@ def validate_horizontal_offset(type, ds, is_first_subds):
target_crs = get_srs(ds, 'target_crs_epsg_code', 'target_crs_wkt',
is_first_subds, infos, warnings, errors)
if target_crs:
if not target_crs.IsGeographic():
warnings.append("target_crs found, but not a Geographic CRS")
if not src_crs or src_crs.IsGeographic():
if not target_crs.IsGeographic():
warnings.append("target_crs found, but not a Geographic CRS")
elif src_crs.IsProjected():
if not target_crs.IsProjected():
warnings.append("target_crs found, but not a Projected CRS")

if ds.RasterCount < 2:
return infos, warnings, [f"TYPE={type} should have at least 2 bands"]
Expand All @@ -100,6 +104,8 @@ def validate_horizontal_offset(type, ds, is_first_subds):
eht_offset_idx = 0
lat_accuracy_idx = 0
lon_accuracy_idx = 0
easting_offset_idx = 0
northing_offset_idx = 0
for i in range(ds.RasterCount):
b = ds.GetRasterBand(i+1)
desc = b.GetDescription()
Expand All @@ -111,6 +117,14 @@ def validate_horizontal_offset(type, ds, is_first_subds):
if lon_offset_idx > 0:
return infos, warnings, ["At least, 2 bands are tagged with Description = longitude_offset"]
lon_offset_idx = i+1
elif desc == 'easting_offset':
if easting_offset_idx > 0:
return infos, warnings, ["At least, 2 bands are tagged with Description = easting_offset"]
easting_offset_idx = i+1
elif desc == 'northing_offset':
if northing_offset_idx > 0:
return infos, warnings, ["At least, 2 bands are tagged with Description = northing_offset"]
northing_offset_idx = i+1
elif desc == 'ellipsoidal_height_offset':
if eht_offset_idx > 0:
return infos, warnings, ["At least, 3 bands are tagged with Description = ellipsoidal_height_offset"]
Expand All @@ -128,12 +142,25 @@ def validate_horizontal_offset(type, ds, is_first_subds):
'Usually the first band should be latitude_offset and the second longitude_offset.')
elif lat_offset_idx > 0 or lon_offset_idx > 0:
return infos, warnings, ["One of the band is tagged with Description = latitude_offset/longitude_offset but not the other one"]
elif easting_offset_idx > 0 and northing_offset_idx > 0:
if easting_offset_idx != 1 or northing_offset_idx != 2:
infos.append(
'Usually the first band should be easting_offset and the second northing_offset.')
elif easting_offset_idx > 0 or northing_offset_idx > 0:
return infos, warnings, ["One of the band is tagged with Description = easting_offset/northing_offset but not the other one"]
else:
if is_first_subds:
warnings.append(
'No explicit bands tagged with Description = latitude_offset and longitude_offset. Assuming first one is latitude_offset and second one longitude_offset')
lat_offset_idx = 1
lon_offset_idx = 2
if src_crs and src_crs.IsProjected():
if is_first_subds:
warnings.append(
'No explicit bands tagged with Description = easting_offset and northing_offset. Assuming first one is easting_offset and second one northing_offset')
easting_offset_idx = 1
northing_offset_idx = 2
else:
if is_first_subds:
warnings.append(
'No explicit bands tagged with Description = latitude_offset and longitude_offset. Assuming first one is latitude_offset and second one longitude_offset')
lat_offset_idx = 1
lon_offset_idx = 2

if type == "GEOGRAPHIC_3D_OFFSET":
if eht_offset_idx == 0:
Expand All @@ -145,29 +172,42 @@ def validate_horizontal_offset(type, ds, is_first_subds):
if eht_offset_idx != 0:
return infos, warnings, ["Band with Description = ellipsoidal_height_offset found, but not expected"]

for idx in (lat_offset_idx, lon_offset_idx):
band = ds.GetRasterBand(idx)
if band.GetNoDataValue():
warnings.append(
"One of latitude_offset/longitude_offset band has a nodata setting. Nodata for horizontal shift grids is ignored by PROJ")
units = band.GetUnitType()
if not units:
if is_first_subds:
if lat_offset_idx:
for idx in (lat_offset_idx, lon_offset_idx):
band = ds.GetRasterBand(idx)
if band.GetNoDataValue():
warnings.append(
"One of latitude_offset/longitude_offset band is missing units description. arc-second will be assumed")
elif units not in ('arc-second', 'arc-seconds per year', 'degree', 'radians'):
errors.append(
"One of latitude_offset/longitude_offset band is using a unit not supported by PROJ")
"One of latitude_offset/longitude_offset band has a nodata setting. Nodata for horizontal shift grids is ignored by PROJ")
units = band.GetUnitType()
if not units:
if is_first_subds:
warnings.append(
"One of latitude_offset/longitude_offset band is missing units description. arc-second will be assumed")
elif units not in ('arc-second', 'arc-seconds per year', 'degree', 'radians'):
errors.append(
"One of latitude_offset/longitude_offset band is using a unit not supported by PROJ")
else:
for idx in (easting_offset_idx, northing_offset_idx):
band = ds.GetRasterBand(idx)
units = band.GetUnitType()
if not units:
if is_first_subds:
warnings.append(
"One of easting_offset/northing_offset band is missing units description.metre will be assumed")
elif units not in ('metre'):
errors.append(
"One of easting_offset/northing_offset band is using a unit not supported by PROJ")

positive_value = ds.GetRasterBand(
lon_offset_idx).GetMetadataItem('positive_value')
if not positive_value:
if is_first_subds:
warnings.append(
"The latitude_offset band should include a positive_value=west/east metadata item, to avoid any ambiguity w.r.t NTv2 original convention. 'east' will be assumed")
elif positive_value not in ('west', 'east'):
errors.append("positive_value=%s not supported by PROJ" %
positive_value)
if lon_offset_idx:
positive_value = ds.GetRasterBand(
lon_offset_idx).GetMetadataItem('positive_value')
if not positive_value:
if is_first_subds:
warnings.append(
"The latitude_offset band should include a positive_value=west/east metadata item, to avoid any ambiguity w.r.t NTv2 original convention. 'east' will be assumed")
elif positive_value not in ('west', 'east'):
errors.append("positive_value=%s not supported by PROJ" %
positive_value)

if eht_offset_idx > 0:
band = ds.GetRasterBand(eht_offset_idx)
Expand Down Expand Up @@ -628,7 +668,7 @@ def validate_ifd(global_info, ds, is_first_subds, first_subds):
if is_first_subds:
errors.append("No CRS found in the GeoTIFF encoding")
else:
if not srs.IsGeographic() and ds.GetMetadataItem('TYPE') != 'DEFORMATION_MODEL':
if not srs.IsGeographic() and ds.GetMetadataItem('TYPE') not in ('DEFORMATION_MODEL', 'HORIZONTAL_OFFSET'):
errors.append("CRS found, but not a Geographic CRS")

if ds.GetMetadataItem('AREA_OR_POINT') != 'Point':
Expand Down Expand Up @@ -713,7 +753,7 @@ def validate_ifd(global_info, ds, is_first_subds, first_subds):
'Image uses %s compression. Might cause compatibility problems' % compression)

if type in ('HORIZONTAL_OFFSET', 'GEOGRAPHIC_3D_OFFSET'):
i, w, e = validate_horizontal_offset(type, ds, is_first_subds)
i, w, e = validate_horizontal_offset(type, ds, srs, is_first_subds)
infos += i
warnings += w
errors += e
Expand Down Expand Up @@ -807,7 +847,7 @@ def validate_ifd(global_info, ds, is_first_subds, first_subds):
md = b.GetMetadata_Dict()
md_keys = md.keys()
for key in md_keys:
if key not in ('positive_value'):
if key not in ('positive_value', 'constant_offset'):
infos.append('Metadata %s=%s on band %d ignored' %
(key, md[key], i+1))

Expand Down

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