Actually, I wouldn't say everything is working so well with a shapefile either:
>>> import mapnik >>> ds = mapnik.Ogr(file='plots.shp', layer='plots') >>> ds.all_features()[2] <mapnik.Feature object at 0xb77ebd14> >>> list(ds.all_features()[2].properties.iteritems()) Segmentation fault On Wed, Feb 16, 2011 at 1:19 PM, David Wiesen <[email protected]> wrote: > If I convert to a shapefile, it all seems to work: > > > ogr2ogr -f "ESRI Shapefile" plots.shp plots.ovf > > >>> import mapnik > >>> ds = mapnik.Ogr(file='plots.shp', layer='plots') > >>> len(ds.all_features()) > 5319 > >>> ds.all_features()[0].envelope() > Envelope(-122.18573661,37.4776842499,-122.185493497,37.4779477793) > > > On Wed, Feb 16, 2011 at 1:11 PM, Dane Springmeyer <[email protected]> wrote: > >> David, >> >> I'm not sure what is wrong. The ALLCAPS "ERROR 1:..." is an indication >> that the original error is being thrown from the OGR library, likely >> specifically the VRT Layer provider in OGR, and Mapnik is simply catching >> this error and re-throwing. >> >> Could you try converting that VRT to another file type using ogr2ogr, and >> see if you get the error still? >> >> Dane >> >> On Feb 16, 2011, at 12:50 PM, David Wiesen wrote: >> >> > I am trying to use an Ogr data source to hook up MySQL as a backend >> > for mapnik. However, I am running into early problems: >> > >> > >>> import mapnik >> > >>> ds = mapnik.Ogr(file='plots.ovf', layer='plots') >> > ERROR 1: GeometryType wkbMultiPolygon not recognised. >> > Traceback (most recent call last): >> > File "<stdin>", line 1, in <module> >> > File "/usr/lib/pymodules/python2.6/mapnik/__init__.py", line 429, in >> Ogr >> > return CreateDatasource(keywords) >> > RuntimeError: GeometryType wkbMultiPolygon not recognised. >> > >>> >> > >> > Here is my plots.ovf file: >> > >> > <OGRVRTDataSource> >> > <OGRVRTLayer name="plots"> >> > <SrcDataSource>MYSQL:mydb,tables=plots</SrcDataSource> >> > <SrcSQL>SELECT geometry_text FROM plots</SrcSQL> >> > <GeometryType>wkbMultiPolygon</GeometryType> >> > <GeometryField encoding="WKT" field="geometry_text"/> >> > </OGRVRTLayer> >> > </OGRVRTDataSource> >> > >> > And running ogrinfo on that file seems to work fine: >> > >> > > ogrinfo -al plots.ovf >> > INFO: Open of `plots.ovf' >> > using driver `VRT' successful. >> > >> > Layer name: plots >> > Geometry: Multi Polygon >> > Feature Count: 5319 >> > Layer SRS WKT: >> > (unknown) >> > geometry_text: String (0.0) >> > OGRFeature(plots):0 >> > geometry_text (String) = MULTIPOLYGON(((-122.185673052387 >> 37.4777167873215,-122.185646862691 37.4777143222677,-122.185625100915 >> 37.4777096171752,-122.185604979133 37.477702249983,-122.185586517242 >> 37.4776939875647,-122.185571439503 37.4776896768873,-122.185551919026 >> 37.4776862811476,-122.185526847508 37.4776842498882,-122.185493496544 >> 37.4776884616152,-122.185519496983 37.4779477792701,-122.185736610317 >> 37.4779335691591,-122.185698114051 37.4777179351354,-122.185673052387 >> 37.4777167873215))) >> > MULTIPOLYGON (((-122.185673052387003 >> 37.477716787321498,-122.185646862691002 >> 37.477714322267701,-122.185625100915004 >> 37.477709617175201,-122.185604979133004 >> 37.477702249982997,-122.185586517242001 >> 37.477693987564699,-122.185571439502993 >> 37.477689676887302,-122.185551919025997 >> 37.477686281147598,-122.185526847508001 >> 37.477684249888199,-122.185493496543998 >> 37.477688461615202,-122.185519496983005 >> 37.477947779270103,-122.185736610316994 >> 37.477933569159099,-122.185698114050993 >> 37.477717935135402,-122.185673052387003 37.477716787321498))) >> > >> > OGRFeature(plots):1 >> > geometry_text (String) = MULTIPOLYGON(((-122.185312727769 >> 37.4777007844723,-122.185339358864 37.4779597716911,-122.185518381277 >> 37.4779477879059,-122.185492383406 37.4776884695019,-122.185312727769 >> 37.4777007844723))) >> > MULTIPOLYGON (((-122.185312727769002 >> 37.477700784472297,-122.185339358863999 >> 37.477959771691097,-122.185518381277006 37.477947787905897,-122.185492383406 >> 37.477688469501899,-122.185312727769002 37.477700784472297))) >> > >> > OGRFeature(plots):2 >> > geometry_text (String) = MULTIPOLYGON(((-122.18512996304 >> 37.4777132757613,-122.185157777835 37.477971168142,-122.18533719723 >> 37.4779604484075,-122.185310413917 37.4777020564695,-122.18512996304 >> 37.4777132757613))) >> > MULTIPOLYGON (((-122.185129963039998 >> 37.477713275761303,-122.185157777835002 >> 37.477971168141998,-122.185337197229998 >> 37.477960448407501,-122.185310413916994 >> 37.477702056469496,-122.185129963039998 37.477713275761303))) >> > ... >> > _______________________________________________ >> > Mapnik-users mailing list >> > [email protected] >> > https://lists.berlios.de/mailman/listinfo/mapnik-users >> >> >
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