Mercurial > dive4elements > river
view backend/contrib/shpimporter/utils.py @ 8098:09725b65955a
Add new and simplyfied SedimentLoadFacet
The SedimentLoadFacet is intended to work with the Measurement stations.
It uses the same mechanismn to access the Mesurement station values
as the calculation does.
SedimentLoadLS values need a different facet that will come soon.
author | Andre Heinecke <andre.heinecke@intevation.de> |
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date | Fri, 15 Aug 2014 18:27:19 +0200 |
parents | 5aa05a7a34b7 |
children |
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import os import sys import logging try: from osgeo import ogr except ImportError: import ogr logger = logging.getLogger("utils") SHP='.shp' SQL_SELECT_RIVER_ID="SELECT id FROM rivers WHERE name = %s" SQL_SELECT_RIVER_ID_ORA="SELECT id FROM rivers WHERE name = :s" def findShapefiles(path): shapes = [] for root, dirs, files in os.walk(path): if len(files) == 0: continue logger.debug("Processing directory '%s' with %i files " % (root, len(files))) for f in files: idx = f.find(SHP) if (idx+len(SHP)) == len(f): shapes.append((f.replace(SHP, ''), root + "/" + f)) return shapes def getRiverId(dbconn, name, oracle): """ Returns the id of the river "name" Dbconn must be a python database connection api compliant object """ cur = dbconn.cursor() if oracle: # This is stupid and shoudl not be neccessary. But I don't # know how to make it work both ways. aheinecke - 02/2013 stmt = SQL_SELECT_RIVER_ID_ORA else: stmt = SQL_SELECT_RIVER_ID cur.execute(stmt, (getUTF8(name),)) row = cur.fetchone() if row: return row[0] else: return 0 def getUTF8(string): """ Tries to convert the string to a UTF-8 encoding by first checking if it is UTF-8 and then trying cp1252 """ try: return unicode.encode(unicode(string, "UTF-8"), "UTF-8") except UnicodeDecodeError: # Probably European Windows names so lets try again return unicode.encode(unicode(string, "cp1252"), "UTF-8") def getUTF8Path(path): """ Tries to convert path to utf-8 by first checking the filesystemencoding and trying the default windows encoding afterwards. Returns a valid UTF-8 encoded unicode object or throws a UnicodeDecodeError """ try: return unicode.encode(unicode(path, sys.getfilesystemencoding()), "UTF-8") except UnicodeDecodeError: # Probably European Windows names so lets try again return unicode.encode(unicode(path, "cp1252"), "UTF-8") WKB_MAP = { ogr.wkb25Bit : 'wkb25Bit', ogr.wkbGeometryCollection : 'wkbGeometryCollection', ogr.wkbGeometryCollection25D :'wkbGeometryCollection25D', ogr.wkbLineString : 'wkbLineString', ogr.wkbLineString25D : 'wkbLineString25D', ogr.wkbLinearRing : 'wkbLinearRing', ogr.wkbMultiLineString : 'wkbMultiLineString', ogr.wkbMultiLineString25D : 'wkbMultiLineString25D', ogr.wkbMultiPoint : 'wkbMultiPoint', ogr.wkbMultiPoint25D : 'wkbMultiPoint25D', ogr.wkbMultiPolygon : 'wkbMultiPolygon', ogr.wkbMultiPolygon25D : 'wkbMultiPolygon25D', ogr.wkbNDR : 'wkbNDR', ogr.wkbNone : 'wkbNone', ogr.wkbPoint : 'wkbPoint', ogr.wkbPoint25D : 'wkbPoint25D', ogr.wkbPolygon : 'wkbPolygon', ogr.wkbPolygon25D : 'wkbPolygon25D', ogr.wkbUnknown : 'wkbUnknown', ogr.wkbXDR : 'wkbXDR' } def getWkbString(type): return WKB_MAP.get(type) or "Unknown" def convertToMultiLine(feature): """ Converts a feature to a multiline feature. """ geometry = feature.GetGeometryRef() # SRS information is lost while forcing to multiline srs = geometry.GetSpatialReference() geometry = ogr.ForceToMultiLineString(geometry) geometry.AssignSpatialReference(srs) feature.SetGeometry(geometry) return feature def convertToMultiPolygon(feature): """ Converts a feature to a multiline feature. """ geometry = feature.GetGeometryRef() # SRS information is lost while forcing to multiline srs = geometry.GetSpatialReference() geometry = ogr.ForceToMultiPolygon(geometry) geometry.AssignSpatialReference(srs) feature.SetGeometry(geometry) return feature