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Fix CRS support on WMS Facade #2302

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Merged
tomkralidis merged 2 commits into from
Mar 26, 2026
+23 −6
Merged

Fix CRS support on WMS Facade #2302

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7c1b7e6
- fixed support for crs 3857 on OGC API - Maps and WMS Facade provider
doublebyte1 Mar 26, 2026
74c729b
- updated maps documentation for the WMS facade provider
doublebyte1 Mar 26, 2026
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9 changes: 9 additions & 0 deletions docs/source/publishing/ogcapi-maps.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -113,6 +113,15 @@ required. An optional style name can be defined via `options.style`.
name: png
mimetype: image/png

.. note::
According to the `Standard <https://docs.ogc.org/is/20-058/20-058.html#_5df53b56-5468-4c9d-acac-6abfddd83ccf>`_, OGC API - Maps
supports a `crs` parameter, expressed as an uri. Currently, this provider supports WGS84 and Web Mercator; for a matter of convenience, they can be expressed in
a number of different ways, other than the uri format.

- `EPSG:4326`
- `EPSG:3857`
- `4326`
- `3857`

Data visualization examples
---------------------------
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19 changes: 14 additions & 5 deletions pygeoapi/api/maps.py
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Expand Up @@ -61,9 +61,17 @@
'http://www.opengis.net/spec/ogcapi-maps-1/1.0/conf/core'
]


DEFAULT_CRS = 'http://www.opengis.net/def/crs/EPSG/0/4326'

CRS_CODES = {
'4326': 'http://www.opengis.net/def/crs/EPSG/0/4326',
'3857': 'http://www.opengis.net/def/crs/EPSG/0/3857',
'http://www.opengis.net/def/crs/EPSG/0/4326': 'http://www.opengis.net/def/crs/EPSG/0/4326', # noqa
'http://www.opengis.net/def/crs/EPSG/0/3857': 'http://www.opengis.net/def/crs/EPSG/0/3857', # noqa
'EPSG:4326': 'http://www.opengis.net/def/crs/EPSG/0/4326',
'EPSG:3857': 'http://www.opengis.net/def/crs/EPSG/0/3857',
}


def get_collection_map(api: API, request: APIRequest,
dataset: str, style: str | None = None
Expand Down Expand Up @@ -106,10 +114,10 @@ def get_collection_map(api: API, request: APIRequest,

query_args['format_'] = request.params.get('f', 'png')
query_args['style'] = style
query_args['crs'] = collection_def.get('crs', DEFAULT_CRS)
query_args['bbox_crs'] = request.params.get(
'bbox-crs', DEFAULT_CRS
)
query_args['crs'] = CRS_CODES[request.params.get(
'crs', collection_def.get('crs', DEFAULT_CRS))]
query_args['bbox_crs'] = CRS_CODES[request.params.get(
'bbox-crs', collection_def.get('crs', DEFAULT_CRS))]
query_args['transparent'] = request.params.get('transparent', True)

try:
Expand Down Expand Up @@ -151,6 +159,7 @@ def get_collection_map(api: API, request: APIRequest,
return headers, HTTPStatus.BAD_REQUEST, to_json(
exception, api.pretty_print)

# the transformer function expects the crs to be in a uri format
if query_args['bbox_crs'] != query_args['crs']:
LOGGER.debug(f'Reprojecting bbox CRS: {query_args["crs"]}')
bbox = transform_bbox(bbox, query_args['bbox_crs'], query_args['crs'])
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1 change: 0 additions & 1 deletion pygeoapi/provider/wms_facade.py
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Expand Up @@ -42,7 +42,6 @@
}

CRS_CODES = {
4326: 'EPSG:4326',
'http://www.opengis.net/def/crs/EPSG/0/4326': 'EPSG:4326',
'http://www.opengis.net/def/crs/EPSG/0/3857': 'EPSG:3857'
}
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