Use the projection from harvested documents. Add a configure option to define the database projection
This commit is contained in:
Adrià Mercader
parent
35537bbbcb
commit
57631a8931
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@ -4,27 +4,14 @@ from ckan.lib.base import c, g, request, \
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response, session, render, config, abort, redirect
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from ckan.controllers.rest import BaseApiController
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from ckan.model import Session
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from ckanext.harvest.lib import get_srid
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class ApiController(BaseApiController):
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def _get_srid(self,crs):
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"""Returns the SRID for the provided CRS definition
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The CRS can be defined in the following formats
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- urn:ogc:def:crs:EPSG::4258
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- EPSG:4258
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- 4258
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"""
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if ':' in crs:
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crs = crs.split(':')
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srid = crs[len(crs)-1]
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else:
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srid = crs
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return int(srid)
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db_srid = int(config.get('ckan.harvesting.srid', '4258'))
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def spatial_query(self):
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if not 'bbox' in request.params:
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@ -39,13 +26,12 @@ class ApiController(BaseApiController):
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maxx = float(bbox[2])
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maxy = float(bbox[3])
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params = {'minx':minx,'miny':miny,'maxx':maxx,'maxy':maxy}
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params = {'minx':minx,'miny':miny,'maxx':maxx,'maxy':maxy,'db_srid':self.db_srid}
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if 'crs' in request.params:
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srid = get_srid(request.params.get('crs')) if 'crs' in request.params else None
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if srid and srid != self.db_srid:
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# The input bounding box is defined in another projection, we need
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# to transform it
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srid = self._get_srid(request.params['crs'])
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statement = """SELECT package_id FROM package_extent WHERE
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ST_Intersects(
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ST_Transform(
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@ -54,7 +40,7 @@ class ApiController(BaseApiController):
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%(maxx)s %(maxy)s,
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%(minx)s %(maxy)s,
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%(minx)s %(miny)s))',%(srid)s),
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4258)
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%(db_srid)s)
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,the_geom)"""
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params.update({'srid': srid})
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else:
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@ -64,9 +50,8 @@ class ApiController(BaseApiController):
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%(maxx)s %(miny)s,
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%(maxx)s %(maxy)s,
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%(minx)s %(maxy)s,
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%(minx)s %(miny)s))',4258),
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%(minx)s %(miny)s))',%(db_srid)s),
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the_geom)"""
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try:
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conn = Session.connection()
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rows = conn.execute(statement,params)
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ids = [row['package_id'] for row in rows]
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@ -74,7 +59,5 @@ class ApiController(BaseApiController):
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output = dict(count=len(ids),results=ids)
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return self._finish_ok(output)
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except:
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abort(500)
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@ -1,53 +1,108 @@
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from ckan.model import Session
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from ckan.lib.base import config
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log = __import__("logging").getLogger(__name__)
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def get_srid(crs):
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"""Returns the SRID for the provided CRS definition
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The CRS can be defined in the following formats
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- urn:ogc:def:crs:EPSG::4258
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- EPSG:4258
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- 4258
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"""
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if ':' in crs:
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crs = crs.split(':')
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srid = crs[len(crs)-1]
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else:
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srid = crs
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return int(srid)
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def save_extent(package,extent=False):
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'''Updates the package extent in the package_extent geometry column
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If no extent provided (as a dict with minx,miny,maxx,maxy and srid keys),
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the values stored in the package extras are used'''
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#TODO: configure SRID
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db_srid = int(config.get('ckan.harvesting.srid', '4258'))
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conn = Session.connection()
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srid = None
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if extent:
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minx = extent['minx']
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miny = extent['miny']
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maxx = extent['maxx']
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maxy = extent['maxy']
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if 'srid' in extent:
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srid = extent['srid']
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else:
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minx = float(package.extras.get('bbox-east-long'))
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miny = float(package.extras.get('bbox-south-lat'))
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maxx = float(package.extras.get('bbox-west-long'))
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maxy = float(package.extras.get('bbox-north-lat'))
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crs = package.extras.get('spatial-reference-system')
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if crs:
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srid = get_srid(crs)
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try:
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# Check if extent already exists
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rows = conn.execute('SELECT package_id FROM package_extent WHERE package_id = %s',package.id).fetchall()
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update =(len(rows) > 0)
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params = {'id':package.id, 'minx':minx,'miny':miny,'maxx':maxx,'maxy':maxy, 'db_srid': db_srid}
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if update:
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# Update
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if srid and srid != db_srid:
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# We need to reproject the input geometry
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statement = """UPDATE package_extent SET
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the_geom = ST_Transform(
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ST_GeomFromText('POLYGON ((%(minx)s %(miny)s,
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%(maxx)s %(miny)s,
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%(maxx)s %(maxy)s,
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%(minx)s %(maxy)s,
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%(minx)s %(miny)s))',%(srid)s),
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%(db_srid)s)
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WHERE package_id = %(id)s
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"""
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params.update({'srid': srid})
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else:
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statement = """UPDATE package_extent SET
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the_geom = ST_GeomFromText('POLYGON ((%(minx)s %(miny)s,
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%(maxx)s %(miny)s,
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%(maxx)s %(maxy)s,
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%(minx)s %(maxy)s,
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%(minx)s %(miny)s))',4258)
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%(minx)s %(miny)s))',%(db_srid)s)
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WHERE package_id = %(id)s
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"""
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msg = 'Updated extent for package %s'
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else:
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# Insert
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if srid and srid != db_srid:
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# We need to reproject the input geometry
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statement = """INSERT INTO package_extent (package_id,the_geom) VALUES (
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%(id)s,
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ST_Transform(
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ST_GeomFromText('POLYGON ((%(minx)s %(miny)s,
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%(maxx)s %(miny)s,
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%(maxx)s %(maxy)s,
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%(minx)s %(maxy)s,
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%(minx)s %(miny)s))',%(srid)s),
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%(db_srid))
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)"""
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params.update({'srid': srid})
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else:
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statement = """INSERT INTO package_extent (package_id,the_geom) VALUES (
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%(id)s,
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ST_GeomFromText('POLYGON ((%(minx)s %(miny)s,
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%(maxx)s %(miny)s,
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%(maxx)s %(maxy)s,
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%(minx)s %(maxy)s,
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%(minx)s %(miny)s))',4258))"""
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%(minx)s %(miny)s))',%(db_srid)s))"""
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msg = 'Created new extent for package %s'
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conn.execute(statement,{'id':package.id, 'minx':minx,'miny':miny,'maxx':maxx,'maxy':maxy})
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conn.execute(statement,params)
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Session.commit()
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log.info(msg, package.id)
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@ -356,7 +356,7 @@ class GeminiDocument(MappedXmlDocument):
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GeminiElement(
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name="spatial-reference-system",
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search_paths=[
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"gmd:referenceSystemInfo/gmd:MD_ReferenceSystem",
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"gmd:referenceSystemInfo/gmd:MD_ReferenceSystem/gmd:referenceSystemIdentifier/gmd:RS_Identifier/gmd:code/gco:CharacterString/text()",
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],
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multiplicity="0..1",
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),
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