[gdal-dev] ogr2ogr intersect very slow at command line with large sqlite input

[CTL101]

Hi Jukka, Thanks for your advice and the useful link. I have done as you
suggested and put together a revised query and tested in on a sample. This
worked successfully and significantly more quickly. I will now test on the
full dataset. The following is my command as it stands. Is this what you
envisaged and do you have any further tips to optimise? Regards, Chris

ogr2ogr -gt 65536 -nlt PROMOTE_TO_MULTI25D --config OGR_SQLITE_CACHE 20480
-f SQLite -dsco SPATIALITE=YES output.sqlite input.sqlite -nln outputtable
-dialect sqlite -sql "SELECT ST_Intersection(A.geometry, B.geometry) AS
geometry, A.acolumnname, B.acolumnname FROM inputtable1 A, inputtable2 B
WHERE ST_Intersects(A.geometry, B.geometry) AND A.ogc_fid IN (SELECT
A.ogc_fid FROM SpatialIndex WHERE f_table_name = 'inputtable1' AND
search_frame = B.geometry)"




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