Postgis_full_version() returned: "POSTGIS="1.3.5" GEOS="3.0.3-CAPI-1.4.2" PROJ="Rel. 4.6.1, 21 August 2008" USE_STATS"
Yes we can share some data with you. What is the easiest way to send you a couple of tables from PostGIS? Paul Ramsey-4 wrote: > > Can you share this test data with me? (Just enough to demonstrate the > condition.) What does your postgis_full_version() return? > > P > > On Tue, Jun 2, 2009 at 2:08 PM, sgrocho2 <[email protected]> wrote: >> >> Okay, I did run ST_IsValid() and everything from each of the layers >> returned >> a t. When visually checking the query results with 167 rows it appears >> that >> the query is only returning rows that intersect the first polygon it >> processes. Leaving out those rows that only intersect the other 5 >> polygons. >> The following image is an example of what is being missed. The polygons >> outlined in blue are not selected by the query since they only touch one >> of >> the parcel polygons(green). >> http://www.nabble.com/file/p23840915/missed_features.jpg >> >> >> >> >> Paul Ramsey-4 wrote: >>> >>> Slow-vs-fast I can understand... the spatial index can more >>> effectively parcel out the problem for processing when the units of >>> processing are smaller. >>> >>> Wrong-vs-right I have a problem with. Are your multi-polygons valid? >>> Run ST_IsValid() on them. It's possible that they are valid taken >>> separately but invalid when combined (multipolygons are not allowed to >>> have overlapping components). >>> >>> Paul >>> >>> On Tue, Jun 2, 2009 at 11:05 AM, sgrocho2 <[email protected]> wrote: >>>> >>>> I am having trouble querying a multipolygon feature intersection with >>>> another >>>> multipolygon feature. When I execute the query it takes 45 seconds and >>>> returns and incomplete answer, 167 rows. If I explode the parcel >>>> polygon >>>> into its 6 parts and then run the same query it takes 5 seconds and >>>> returns >>>> 209 rows which is the correct answer. Is there a way to write this >>>> query >>>> to >>>> return the all the rows without having to first manipulate the data? >>>> The >>>> same query works fine in SQL Server but we want to use PostGIS. Below >>>> is >>>> the >>>> code for each of the Parcel tables they include only one parcel - one >>>> with 1 >>>> row, the other with 6 rows. >>>> >>>> THIS IS THE SINGLE FEATURE MULTIPOLYGON CODE: 45sec 167 rows >>>> SELECT DISTINCT g1.objectid As taxpar_id, g1.tax_parcel_num As >>>> parcel_number, g2.objectid As fw_id, g2.wdfw_phs, g2.wdfw_occur_pt, >>>> g2.wdfw_haulout, g2.pc_for_fish, g2.wdfw_fish_dist, g2.pc_oaks, >>>> g2.pc_salmon, g2.wdfw_occur_pl, g2.doh_sf, g2.wdfw_owl, g2.pc_eelgrass, >>>> g2.pc_hydro, g2.wdfw_sasi >>>> FROM loader.single_parcel As g1, >>>> loader.potential_fw_habitat_cons_areas_pg >>>> As g2 >>>> WHERE (g1.tax_parcel_num = '0618161001' AND >>>> ST_Intersects(ST_Buffer(g1.Shape,-1), g2.Shape)) >>>> >>>> THIS IS THE EXPLODED 6 FEATURES CODE: 5sec 209 rows >>>> SELECT DISTINCT g1.objectid As taxpar_id, g1.tax_parcel_num As >>>> parcel_number, g2.objectid As fw_id, g2.wdfw_phs, g2.wdfw_occur_pt, >>>> g2.wdfw_haulout, g2.pc_for_fish, g2.wdfw_fish_dist, g2.pc_oaks, >>>> g2.pc_salmon, g2.wdfw_occur_pl, g2.doh_sf, g2.wdfw_owl, g2.pc_eelgrass, >>>> g2.pc_hydro, g2.wdfw_sasi >>>> FROM loader.multi_parcel As g1, >>>> loader.potential_fw_habitat_cons_areas_pg >>>> As g2 >>>> WHERE (g1.tax_parcel_num = '0618161001' AND >>>> ST_Intersects(ST_Buffer(g1.Shape,-1), g2.Shape)) >>>> >>>> -- >>>> View this message in context: >>>> http://www.nabble.com/query-multipolygon-tp23836573p23836573.html >>>> Sent from the PostGIS - User mailing list archive at Nabble.com. >>>> >>>> _______________________________________________ >>>> postgis-users mailing list >>>> [email protected] >>>> http://postgis.refractions.net/mailman/listinfo/postgis-users >>>> >>> _______________________________________________ >>> postgis-users mailing list >>> [email protected] >>> http://postgis.refractions.net/mailman/listinfo/postgis-users >>> >>> >> >> -- >> View this message in context: >> http://www.nabble.com/query-multipolygon-tp23836573p23840915.html >> Sent from the PostGIS - User mailing list archive at Nabble.com. >> >> _______________________________________________ >> postgis-users mailing list >> [email protected] >> http://postgis.refractions.net/mailman/listinfo/postgis-users >> > _______________________________________________ > postgis-users mailing list > [email protected] > http://postgis.refractions.net/mailman/listinfo/postgis-users > > -- View this message in context: http://www.nabble.com/query-multipolygon-tp23836573p23841693.html Sent from the PostGIS - User mailing list archive at Nabble.com. _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
