Hi Jukka,
GeoPackage geometry is read with JTS WKBReader which is supposed to
handle 3D geometries.
I think it cannot read ZM though.
The WKB type returned in the error message is the geometry type
truncated to the 2 last bytes,
z information is held in a separate boolean variable for every type > 128.
Maybe the reading of the wkb part does not start exactly where it
should. Or maybe there is an
endianness problem.
In the example of stackoverflow, I would say that the input wkb is
actually not valid (I would write
wkb type as 03ea0000, not ea030000), but I may be wrong.
Michaël
Le 08/02/2016 23:40, Rahkonen Jukka (MML) a écrit :
Hi,
I tried to open a GeoPackage file through the new Spatialite datastore
but got just JTS errors like “unknown wkb type 235”. I discovered soon
that my data had also Z-coordinates and this Stackoverflow question
http://stackoverflow.com/questions/29142663/parse-wkb-string-using-jts-topology-suite
handles the same issue. But don’t we have some support for 3d
geometries in WKB range 1001-1007 in other places of OpenJUMP?
The full list of WKB types from page 66 of “OpenGIS® Implementation
Standard for Geographic information - Simple feature access - Part 1:
Common architecture” is as follows:
enum WKBGeometryType {
wkbPoint = 1,
wkbLineString = 2,
wkbPolygon = 3,
wkbTriangle = 17
wkbMultiPoint = 4,
wkbMultiLineString = 5,
wkbMultiPolygon = 6,
wkbGeometryCollection = 7,
wkbPolyhedralSurface = 15,
wkbTIN = 16
wkbPointZ = 1001,
wkbLineStringZ = 1002,
wkbPolygonZ = 1003,
wkbTrianglez = 1017
wkbMultiPointZ = 1004,
wkbMultiLineStringZ = 1005,
wkbMultiPolygonZ = 1006,
wkbGeometryCollectionZ = 1007,
wkbPolyhedralSurfaceZ = 1015,
wkbTINZ = 1016
wkbPointM = 2001,
wkbLineStringM = 2002,
wkbPolygonM = 2003,
wkbTriangleM = 2017
wkbMultiPointM = 2004,
wkbMultiLineStringM = 2005,
wkbMultiPolygonM = 2006,
wkbGeometryCollectionM = 2007,
wkbPolyhedralSurfaceM = 2015,
wkbTINM = 2016
wkbPointZM = 3001,
wkbLineStringZM = 3002,
wkbPolygonZM = 3003,
wkbTriangleZM = 3017
wkbMultiPointZM = 3004,
wkbMultiLineStringZM = 3005,
wkbMultiPolygonZM = 3006,
wkbGeometryCollectionZM = 3007,
wkbPolyhedralSurfaceZM = 3015,
wkbTinZM = 3016,
}
-Jukka Rahkonen-
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