Martin et al, My first reaction to Jonathan's post and your question was to say that, no, Oracle (as an OGC SFS and SQL/MM compliant product) does not support a "MultiPolygon which contains a MultiPolygon". I thought, though, that I should examine the actual geometry in detail so I converted Jonathan's WKT geometry below back into an Oracle SDO_GEOMETRY and examined its SDO_ELEM_INFO array. This is the result:
SDO_ELEM_INFO(1,1003,1,1743,2003,1,2041,2003,1,2071,1003,1,2779,2003,1) This is: a simple polygon outer shell (1,1003,1) followed by 4 inner shells (2003): 1743,2003,1, 2041,2003,1, 2071,1003,1, 2779,2003,1 Note that there is only 1 outer shell. Even if there were many outer shells with each having many inner shells, the result would still be a single multipolygon. My test harness is after my salutation at the very end of this email. regards Simon > Date: Wed, 11 Feb 2009 11:24:23 -0800 > From: Martin Davis <mbda...@refractions.net> > Subject: Re: [jts-devel] jts-io mutipolygon > To: JTS Topology Suite Development <jts-devel@lists.jump-project.org> > Message-ID: <499325e7.90...@refractions.net> > Content-Type: text/plain; charset=windows-1252; format=flowed > > Under the OGC SFS spec there is no such thing as a "MultiPolygon which > contains a MultiPolygon". Does Oracle actually support this? > > If this is truly the case, I think you're seeing the workaround - JTS > maps the geometry to something which fits in its model. (Although this > situation was probably never designed for - I'm actually surprised that > it works). > > Houde, Jonathan wrote: >> >> Hi all, >> >> I’ve been using jts-io to read geometries from oracle database. >> >> I have a certain case where the geometry is a MultiPolygon which >> contains MultiPolygon, >> >> It seems that jts-io is not excepting this and doesn’t load it correctly. >> >> It read the inner Multipolygon as single Polygon >> >> You can see the geometry at the corresponding wkt geometry at the >> bottom of my mail. >> >> Any fix planned for that or possible workaround? >> >> Thanks, >> >> Jonathan >> >> SDO_UTIL.TO_WKTGEOMETRY(GEOLOC) MULTIPOLYGON (((-71.33959188 >> 46.81182897, -71.33935608 46.81166004, -71.33922 46.81155897, >> -71.33990904 46.811142, -71.34054516 46.81077003, -71.34058512 -- SpatialDB Advice and Design, Solutions Architecture and Programming, Oracle Database 10g Administrator Certified Associate; Oracle Database 10g SQL Certified Professional Oracle Spatial, SQL Server, PostGIS, MySQL, ArcSDE, Manifold GIS, FME, Radius Topology and Studio Specialist. 39 Cliff View Drive, Allens Rivulet, 7150, Tasmania, Australia. Website: www.spatialdbadvisor.com Email: si...@spatialdbadvisor.com Voice: +613 9016 3910 Mobile: +61 418 396391 Skype: sggreener Longitude: 147.20515 (147° 12' 18" E) Latitude: -43.01530 (43° 00' 55" S) NAC:W80CK 7SWP3 create table crap ( geom sdo_geometry ); declare v_clob clob; begin DBMS_LOB.CREATETEMPORARY ( v_clob, true ); DBMS_LOB.APPEND(v_clob,CAST( 'MULTIPOLYGON (((-71.33959188 46.81182897, -71.33935608 46.81166004, -71.33922 46.81155897, -71.33990904 46.811142, -71.34054516 46.81077003, -71.34058512 46.81073304, -71.340696 46.81068102, -71.34135804 46.81030401, -71.34409296 46.80851202, -71.34414192 46.80847998, -71.34545592 46.80764199, -71.343018 46.80610002, -71.34094512 46.80466497, -71.34071184 46.804464, -71.34021612 46.80437697, -71.340561 46.804158, -71.340885 46.803951, -71.34116508 46.803753, -71.34076692 46.80349497, -71.33945904 46.802592, -71.33939784 46.80254304, -71.33729688 46.80118296, -71.33686092 46.80076896, -71.33577984 46.80012303, -71.33559084 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46.87863003, -71.370873 46.87858404, -71.37070884 46.87848702, -71.37066492 46.87838703, -71.37025416 46.87839396, -71.37027108 46.87882101, -71.37027288 46.87932303, -71.37017316 46.87941897, -71.37024696 46.87957098, -71.37003096 46.87971003, -71.36983116 46.87969896, -71.36975412 46.87964397, -71.36976708 46.87952301, -71.36993412 46.87944804, -71.36998308 46.87938396, -71.36992692 46.87932897, -71.36971812 46.87929603, -71.369541 46.87930503, -71.36941608 46.87938, -71.36941212 46.87983801, -71.36955108 46.88008002, -71.36948988 46.88039097, -71.36930016 46.88043003, -71.36925804 46.88049897, -71.36882316 46.88048304, -71.36881596 46.880316, -71.36891604 46.88020998, -71.36885988 46.88016498, -71.36876988 46.88015103, -71.36846496 46.88018604, -71.36844192 46.88041302, -71.36870292 46.88079597, -71.36865216 46.88106903, -71.36830404 46.88119899, -71.36781408 46.88127, -71.36778492 46.88176401, -71.36751096 46.88158599, -71.36629992 46.88072496, -71.35996608 46.87448598, -71.36043516 46.87427196, -71.361639 46.87380999, -71.36181684 46.87368003, -71.36186508 46.87357104), (-71.37126792 46.88213004, -71.37108612 46.88213103, -71.37123588 46.88207298, -71.37126792 46.88213004)))' as clob)); insert into crap values( SDO_UTIL.FROM_WKTGEOMETRY(v_clob) ); end; select c.geom.sdo_elem_info from crap c; _______________________________________________ jts-devel mailing list jts-devel@lists.jump-project.org http://lists.refractions.net/mailman/listinfo/jts-devel