Hi, I tried to do the following with spatialite-gui v. 1.5.0 and 1.6.0 which contain Spatialite v. 3.0 and 4.0, respectively.
select asbinary(geomfromtext('MULTIPOLYGON(((0 0, 10 20, 30 40, 0 0), (1 1, 2
2, 3 3, 1 1)),
((100 100, 110 110, 120 120, 100 100)))
'))
I saved the returned binary code into disk and both versions seem to give gives
those different bytes as 00 01 03, that is, similarly to PostGIS. But you do
not use select as binary but you convert the Spatialite BLOBs into WKB with
your code, doesn't you? Perhaps there is something to check with the
Spatialite BLOB document http://www.gaia-gis.it/gaia-sins/BLOB-Geometry.html.
The whole WKB in attachment.
-Jukka-
________________________________
Lähettäjä: Larry Reeder [lnree...@gmail.com]
Lähetetty: 15. huhtikuuta 2013 6:51
Vastaanottaja: OpenJump develop and use
Aihe: Re: [JPP-Devel] Spatialite multigeometry trouble and JTS v. 1.13
On Sun, Apr 14, 2013 at 3:39 PM, Rahkonen Jukka
<jukka.rahko...@mmmtike.fi<mailto:jukka.rahko...@mmmtike.fi>> wrote:
Hi,
I made two tests:
1) With PostGIS 2.1
select encode(ST_AsBinary(ST_GeomFromText('MULTIPOLYGON(((0 0, 10 20, 30 40, 0
0), (1 1, 2 2, 3 3, 1 1)),
((100 100, 110 110, 120 120, 100 100)))')), 'hex')
Query gives the same WKB that you used in JTS bug #3610843, that is
"0106000000020000000103000000020000000400000000000000000000000000000000000000000000000000244000000000000034400000000000003e4000000000000044400000000000000000000000000000000004000000000000000000f03f000000000000f03f0000000000000040000000000000004000000000000008400000000000000840000000000000f03f000000000000f03f01030000000100000004000000000000000000594000000000000059400000000000805b400000000000805b400000000000005e400000000000005e4000000000000059400000000000005940"
2) With Spatialite
select
GeomFromWKB(x'0106000000020000006903000000020000000400000000000000000000000000000000000000000000000000244000000000000034400000000000003E4000000000000044400000000000000000000000000000000004000000000000000000F03F000000000000F03F0000000000000040000000000000004000000000000008400000000000000840000000000000F03F000000000000F03F69030000000100000004000000000000000000594000000000000059400000000000805B400000000000805B400000000000005E400000000000005E4000000000000059400000000000005940')
Query creates a multipolygon geometry.
Jukka, these two WKB hex strings differ around the 20th character:
01060000000200000001030
01060000000200000069030
The second one is the one I retrieved from spatialite. When I try to parse
the second one with Postgis (1.5.3), I get an error:
select
ST_GeomFromWkb(decode('0106000000020000006903000000020000000400000000000000000000000000000000000000000000000000244000000000000034400000000000003E4000000000000044400000000000000000000000000000000004000000000000000000F03F000000000000F03F0000000000000040000000000000004000000000000008400000000000000840000000000000F03F000000000000F03F69030000000100000004000000000000000000594000000000000059400000000000805B400000000000805B400000000000005E400000000000005E4000000000000059400000000000005940',
'hex'));
ERROR: invalid WKB type
HINT: You must specify a valid OGC WKT geometry type such as POINT, LINESTRING
or POLYGON
I haven't manually verified the WKB, but it might be that spatialite is
generating an invalid WKB, and JTS 1.12 was more forgiving about it than 1.13
is.
-lreeder
Therefore it looks like the WKB is ok. But I do not understand that if PostGIS
gives exactly the same WKB, how it is possible that OpenJUMP works with PostGIS
but not with Spatialite through DB Query plugin?
-Jukka Rahkonen-
spg15bin
Description: spg15bin
------------------------------------------------------------------------------ Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis & visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter
_______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
