Hi,
Sorry, I was thinking that you programmers are interested in the deep details.
That file can't be read directly with OJ because it is just the geometry BLOB
from the database. Perhaps somebody who knows the source code could feed the
blob into the Spatialite code in the debug environment and see what happens.
Here is a small GeoPackage that shows the problem with parsing XYZ geometries
http://latuviitta.org/downloads/mtk.gpkg.
Make a spatialite connection to the database file and try to read some layer.
My example was from the "kunta" layer which is POLYGON Z.
-Jukka-
Michaël Michaud wrote:
Jukka,
Can you give me some some hints to test the file with OpenJUMP ?
I tried to open the file with datastore / spatialite driver, but it does not
seem to recognize the file as a sqlite database.
Is it supposed to be recognized as is.
With
Le 09/02/2016 11:09, Rahkonen Jukka (MML) a écrit :
Hi Michaël,
Please find attached one GeoPackage blob that OpenJUMP does not convert. It is
of type POLYGON Z, thus 1003 and 03ea as hexadecimal.
I am not good in reading bits and bytes but I have tried.
Bytes 1-3:
47 50 00
"GP" and "0" Means that file is Geopackage, version 1
Byte 4: 05
This is a lag byte with bit values 0 0 0 0 0 1 0 1
Of those flags bits 5-7 "010" makes number "2", which means that envelope is
[minx, maxx, miny, maxy, minz, maxz] and it takes 48 bytes. Remember this.
Bytes 5-8:
fb 0b 00 00
SRID, value as decimal number "3067"
Bytes 9-56
48 bytes used for the envelope
Bytes 57 ->
WKB
starts 00 01 eb 03 ...
In reversed order "03 eb" is 1003 as decimal, which means "wkbPolygonZ" which
is correct.
Regards,
-Jukka-
Lähettäjä: Michaël Michaud [mailto:[email protected]]
Lähetetty: 9. helmikuuta 2016 10:13
Vastaanottaja:
[email protected]<mailto:[email protected]>
Aihe: Re: [JPP-Devel] Parsing XYZ geometries from Geopackage
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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