kedardeshpande87 <kedardeshpande87 <at> gmail.com> writes: > > Hi, > > I have downloaded the latest shapefiles from US Census Bureau TIGER > Shapefiles containaing the ZipCode Tabulation Area (2010) information. I am > reading the shapefile to retrieve the zip code for a given point having > latitude/longitude. I open the shapefile to get the data source, get the > zipcode layer from that and the set a spatial filter on it. > But currently, I am getting very slow performance when doing this. It takes > on an average 200 milliseconds to find a zip code for a given point. > I had downloaded the ZCTA 2010 shapefile a few months ago and I was getting > the latency of around 1 to 2 milliseconds on an average. I recently > downloaded the same ZCTA 2010 shapefile from US Census Bureau web site and > now I am getting latency of 200 milliseconds. The code that reads the > shapefiles is the same. > > Has anyone else observed similar behavior ? > What could be the cause of such a high latency ?
Perhaps there is something wrong with the spatial index. Drop and re-create the index as described in http://www.gdal.org/ogr/drv_shapefile.html and check if queries get faster. -Jukka Rahkonen- _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
