I want to use tilestache to get geojson files. I hava run tilestache-server.py -c tilestache.cfg ,and it works well.
However,I want to get tiles from data stored in postgis. Maybe it will need to run tilestache-seed.py. So I run`
tilestache-seed.py -c ~/TileStache-1.49.8/cfg1 -b 32.000 114.000 31.000 115.000 -l postgis 12 -e geojson
then I got
Traceback (most recent call last):
File "/usr/local/bin/tilestache-seed.py", line 331, in mimetype, content = getTile(layer, coord, extension, options.ignore_cached) File "/usr/local/lib/python2.7/dist-packages/TileStache/init.py", line 64, in getTile status_code, headers, body = layer.getTileResponse(coord, extension, ignore_cached) File "/usr/local/lib/python2.7/dist-packages/TileStache/Core.py", line 414, in getTileResponse tile = self.render(coord, format) File "/usr/local/lib/python2.7/dist-packages/TileStache/Core.py", line 500, in render tile = provider.renderTile(width, height, srs, coord) File "/usr/local/lib/python2.7/dist-packages/TileStache/Vector/init.py", line 583, in renderTile layer, ds = _open_layer(self.driver, self.parameters, self.layer.config.dirpath) File "/usr/local/lib/python2.7/dist-packages/TileStache/Vector/init.py", line 453, in _open_layer raise KnownUnknown('Couldn\'t get a layer from data source %s' % source_name) TileStache.Core.KnownUnknown: Couldn't get a layer from data source PG:dbname='osmgis' user='postgres' host='127.0.0.1' password='xxxxxx'port='5432'
here is my cfg1
{
"cache": { "name": "Disk", "path": "~/TileStache-1.49.8/stache", "umask": "0000" }, "layers": { "postgis": { "provider": { "name": "vector", "driver": "PostgreSQL", "parameters": { "dbname": "osmgis", "user": "postgres", "password":"xxxxxx", "host": "127.0.0.1", "port": 5432, "query": "SELECT ST_AsGeojson(geom) from wuhan_osm_roads"}} }
I am a beginner ,and I don't know how to solve the problem.
by the way, if i delete "12" behind "postgis" in code,it works but output nothing.
