Steve The selection of layer data is done by a bounding box, though querying by parameter values is just as slow. The mapfile is directly calling up the shapefile (I had just followed the P.Mapper examples of displaying/querying shapefiles directly). So probably the answers to those questions lie under the hood of P.Mapper, which I assume is using the PHP mapscript.dll to do the work. Is the direct query to shapefile approach v.efficient for larger datasets..?. Ignoring the app I am using what is a good approach to large feature datasets from a MapServer perspective?
Thanks Chris On 24 August 2010 14:27, Lime, Steve D (DNR) <steve.l...@state.mn.us> wrote: > How is the selection done? How is the highlighting done? Those processes > will really impact performance depending on how things are implemented. > > Steve > > ________________________________________ > From: mapserver-users-boun...@lists.osgeo.org [ > mapserver-users-boun...@lists.osgeo.org] On Behalf Of Chris Jackson [ > webturt...@gmail.com] > Sent: Tuesday, August 24, 2010 3:19 AM > To: email@example.com > Subject: [mapserver-users] Feature select performance > > Hi all > > I have rigged up a webGIS app (P.Mapper framework) where one of the > underlying datasets is a model grid (many thousand cells) in a shapefile. > The data displays nice and quick when just viewing, but if I allow the user > to select say 5000 cells it is very (extremely) slow to redraw with the > highlighted cells. Doing the same task in a very old ArcGIS server web app > was much quicker (admittedly the data was in SDE/MS SQL). So my question is > what is the best way to improve performance - would just transferring the > shapefile to to say a MS SQL 2005 db with the MSSQLSPATIAL add-on be a good > step or is there are better way to present the data in the Map file? > Many thanks > Chris >
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