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Zarr: implement read support for 'spatial' and 'proj' conventions
See: - https://github.com/zarr-conventions/spatial - https://github.com/zarr-conventions/geo-proj Supersedes earlier non-commited: OSGeo#13215
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-48
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12 files changed

+940
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‎autotest/gdrivers/data/zarr/v3/spatial_geotransform.zarr/zarr.json‎

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{
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"attributes": {
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"zarr_conventions": [
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{
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"schema_url": "https://raw.githubusercontent.com/zarr-conventions/spatial/refs/tags/v1/schema.json",
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"spec_url": "https://github.com/zarr-conventions/spatial/blob/v1/README.md",
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"uuid": "689b58e2-cf7b-45e0-9fff-9cfc0883d6b4",
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"name": "spatial:",
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"description": "Spatial coordinate information"
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}
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]
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},
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"zarr_format": 3,
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"consolidated_metadata": {
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"kind": "inline",
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"must_understand": false,
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"metadata": {
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"ar": {
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"shape": [
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],
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"data_type": "float32",
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"chunk_grid": {
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"name": "regular",
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"configuration": {
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"chunk_shape": [
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200,
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]
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}
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},
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"chunk_key_encoding": {
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"name": "default",
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"configuration": {
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"separator": "/"
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}
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},
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"fill_value": "NaN",
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"codecs": [
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{
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"name": "bytes",
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"configuration": {
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"endian": "little"
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}
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}
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],
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"attributes": {
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"spatial:dimensions": ["y", "x"],
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"spatial:transform": [10, 0.1, 450000,
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0.15, -10, 5000000]
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},
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"dimension_names": [
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"y",
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"x"
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],
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"zarr_format": 3,
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"node_type": "array",
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"storage_transformers": []
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}
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}
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},
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"node_type": "group"
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}

‎autotest/gdrivers/data/zarr/v3/spatial_proj_at_array_level.zarr/zarr.json‎

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{
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"attributes": {
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"zarr_conventions": [
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{
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"schema_url": "https://raw.githubusercontent.com/zarr-experimental/geo-proj/refs/tags/v1/schema.json",
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"spec_url": "https://github.com/zarr-experimental/geo-proj/blob/v1/README.md",
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"uuid": "f17cb550-5864-4468-aeb7-f3180cfb622f",
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"name": "proj:",
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"description": "Coordinate reference system information for geospatial data"
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},
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{
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"schema_url": "https://raw.githubusercontent.com/zarr-conventions/spatial/refs/tags/v1/schema.json",
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"spec_url": "https://github.com/zarr-conventions/spatial/blob/v1/README.md",
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"uuid": "689b58e2-cf7b-45e0-9fff-9cfc0883d6b4",
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"name": "spatial:",
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"description": "Spatial coordinate information"
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}
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]
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},
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"zarr_format": 3,
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"consolidated_metadata": {
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"kind": "inline",
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"must_understand": false,
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"metadata": {
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"ar": {
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"shape": [
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200,
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100
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],
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"data_type": "float32",
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"chunk_grid": {
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"name": "regular",
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"configuration": {
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"chunk_shape": [
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200,
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]
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}
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},
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"chunk_key_encoding": {
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"name": "default",
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"configuration": {
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"separator": "/"
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}
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},
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"fill_value": "NaN",
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"codecs": [
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{
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"name": "bytes",
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"configuration": {
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"endian": "little"
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}
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}
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],
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"attributes": {
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"proj:code": "EPSG:32631",
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"spatial:registration": "pixel",
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"spatial:dimensions": ["y", "x"],
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"spatial:transform": [10, 0, 450000,
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0, -10, 5000000]
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},
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"dimension_names": [
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"y",
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"x"
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],
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"zarr_format": 3,
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"node_type": "array",
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"storage_transformers": []
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}
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}
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},
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"node_type": "group"
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}

‎autotest/gdrivers/data/zarr/v3/spatial_proj_at_parent_level.zarr/zarr.json‎

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{
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"attributes": {
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"zarr_conventions": [
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{
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"schema_url": "https://raw.githubusercontent.com/zarr-experimental/geo-proj/refs/tags/v1/schema.json",
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"spec_url": "https://github.com/zarr-experimental/geo-proj/blob/v1/README.md",
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"uuid": "f17cb550-5864-4468-aeb7-f3180cfb622f",
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"name": "proj:",
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"description": "Coordinate reference system information for geospatial data"
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},
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{
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"schema_url": "https://raw.githubusercontent.com/zarr-conventions/spatial/refs/tags/v1/schema.json",
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"spec_url": "https://github.com/zarr-conventions/spatial/blob/v1/README.md",
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"uuid": "689b58e2-cf7b-45e0-9fff-9cfc0883d6b4",
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"name": "spatial:",
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"description": "Spatial coordinate information"
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}
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],
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"proj:wkt2": "PROJCRS[\"WGS 84 / UTM zone 31N\",BASEGEOGCRS[\"WGS 84\",ENSEMBLE[\"World Geodetic System 1984 ensemble\",MEMBER[\"World Geodetic System 1984 (Transit)\"],MEMBER[\"World Geodetic System 1984 (G730)\"],MEMBER[\"World Geodetic System 1984 (G873)\"],MEMBER[\"World Geodetic System 1984 (G1150)\"],MEMBER[\"World Geodetic System 1984 (G1674)\"],MEMBER[\"World Geodetic System 1984 (G1762)\"],MEMBER[\"World Geodetic System 1984 (G2139)\"],MEMBER[\"World Geodetic System 1984 (G2296)\"],ELLIPSOID[\"WGS 84\",6378137,298.257223563,LENGTHUNIT[\"metre\",1]],ENSEMBLEACCURACY[2.0]],PRIMEM[\"Greenwich\",0,ANGLEUNIT[\"degree\",0.0174532925199433]],ID[\"EPSG\",4326]],CONVERSION[\"UTM zone 31N\",METHOD[\"Transverse Mercator\",ID[\"EPSG\",9807]],PARAMETER[\"Latitude of natural origin\",0,ANGLEUNIT[\"degree\",0.0174532925199433],ID[\"EPSG\",8801]],PARAMETER[\"Longitude of natural origin\",3,ANGLEUNIT[\"degree\",0.0174532925199433],ID[\"EPSG\",8802]],PARAMETER[\"Scale factor at natural origin\",0.9996,SCALEUNIT[\"unity\",1],ID[\"EPSG\",8805]],PARAMETER[\"False easting\",500000,LENGTHUNIT[\"metre\",1],ID[\"EPSG\",8806]],PARAMETER[\"False northing\",0,LENGTHUNIT[\"metre\",1],ID[\"EPSG\",8807]]],CS[Cartesian,2],AXIS[\"(E)\",east,ORDER[1],LENGTHUNIT[\"metre\",1]],AXIS[\"(N)\",north,ORDER[2],LENGTHUNIT[\"metre\",1]],USAGE[SCOPE[\"Navigation and medium accuracy spatial referencing.\"],AREA[\"Between 0°E and 6°E, northern hemisphere between equator and 84°N, onshore and offshore. Algeria. Andorra. Belgium. Benin. Burkina Faso. Denmark - North Sea. France. Germany - North Sea. Ghana. Luxembourg. Mali. Netherlands. Niger. Nigeria. Norway. Spain. Togo. United Kingdom (UK) - North Sea.\"],BBOX[0,0,84,6]],ID[\"EPSG\",32631]]",
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"spatial:dimensions": ["y", "x"],
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"spatial:transform": [10, 0, 450000,
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0, -10, 5000000]
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},
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"zarr_format": 3,
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"consolidated_metadata": {
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"kind": "inline",
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"must_understand": false,
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"metadata": {
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"ar": {
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"shape": [
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200,
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100
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],
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"data_type": "float32",
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"chunk_grid": {
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"name": "regular",
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"configuration": {
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"chunk_shape": [
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200,
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100
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]
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}
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},
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"chunk_key_encoding": {
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"name": "default",
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"configuration": {
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"separator": "/"
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}
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},
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"fill_value": "NaN",
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"codecs": [
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{
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"name": "bytes",
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"configuration": {
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"endian": "little"
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}
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}
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],
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"attributes": {
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},
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"dimension_names": [
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"y",
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"x"
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],
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"zarr_format": 3,
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"node_type": "array",
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"storage_transformers": []
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}
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}
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},
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"node_type": "group"
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}

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