Hi Even,
Your timing is brilliant!! :-)
I have a meeting on Monday, where I am about to confess failure in
converting mdb to (multiple) shape files.
I sadly have no time today (it's almost 18h00 here) but will be in
tomorrow as I have a deadline for Monday.
I have just looked at www.gdal.org and not found a link to your version.
If you can spoonfeed me I can test it for you tomorrow (on a reasonable
size & complexity of data).
I either need a WinVista binary, or sourcecode & instructions (ie
dependencies) on how to compile and use it to covert mdb to SHP, on
Ubuntu 10.04.
Linux is preferable. GDAL is not yet installed on this box. (but build
essentials is).
If you can do this for me, I will test it tomorrow.
Thanks & regards,
Zoltan
PS: I tried with gvsig on windows, could open & view the mdb, query &
zoom around it, but could not save it as shape files. IIRC, the error
was due to NULL entries in the attribute tables.
On 2011-01-22 17:42, Even Rouault wrote:
Hi,
I've just added a read-only geomedia driver in GDAL trunk (GDAL 1.9.0dev).
Testing is appreciated.
It would be usefull if someone could provide a small and freely redistribuable
geomedia .mdb (possibly hand-made with fake data) with different types of
geometries (1 feature for each geometry type is enough) so that it can be
included in the autotest suite. For now, it has just been tested with the
MMSDTestDB.zip attachment found on http://forum.manifold.net/forum/t106539.11
What is mainly missing is SRS support. I see that the GCoordSystem contains
all the info. For the above example :
Stor2CompMatrix1 (Real) = 0.3048
GeodeticDatum (Integer) = 0
Ellipsoid (Integer) = 21
EquatorialRadius (Real) = 6378407.621
InverseFlattening (Real) = 298.269875040474
ProjAlgorithm (Integer) = 2
AzimuthAngle (Real) = (null)
FalseX (Real) = 247193.2944
FalseY (Real) = 0
Hemisphere (Integer) = (null)
LatOfOrigin (Real) = 41.75
LatOfTrueScale (Real) = (null)
LonOfOrigin (Real) = -89.4222222222222
RadOfStandCircle (Real) = (null)
ScaleReductFact (Real) = 1
StandPar1 (Real) = 42.9083333333333
StandPar2 (Real) = 43.2305555555556
But the GeodeticDatum, Ellipsoid and ProjAlgorithm fields presumably map to
enumerations, so examples of databases using various SRS (starting with the
most common ones like lat/long WGS84 and UTM WGS84) with the "text"
description of the SRS would be necessary to establish this mapping. Unless
someone knows where to find a spec of this ?
From the above sample and a bit of googling, I've deduced this is equivalent
to the following ESRI WKT :
PROJCS["NAD_1983_HARN_Adj_WI_Dane_Feet",GEOGCS["GCS_NAD_1983_HARN_Adj_WI_Dane",DATUM["D_NAD_1983_HARN_Adj_WI_DN",SPHEROID["GRS_1980_Adj_WI_DN",6378407.621,298.269876997368]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",811000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-89.42222222222223],PARAMETER["Standard_Parallel_1",42.90833333333333],PARAMETER["Standard_Parallel_2",43.23055555555555],PARAMETER["Latitude_Of_Origin",41.75],UNIT["Foot_US",0.3048006096012192]]
So ProjAlgorithm 2 is likely meaning Lambert_Conformal_Conic_2SP and Ellipsoid
= 21 = GRS_1980_Adj_WI_DN ?
Best regards,
Even
Le mardi 12 octobre 2010 18:33:59, Frank Warmerdam a écrit :
Moskovitz, Bob wrote:
Frank,
I'm also interested in seeing a Geomedia driver for gdal. Btw, gvSIG has
a Geomedia plugin (see https://code.google.com/p/extmdb ). This might
help you figure out how to make a driver for gdal.
Bob,
Interesting. Using the extmdb MDBGeometryAdapter.java code it should be
possible to fairly easily implement geomedia feature reading in OGR.
Anyone interested in taking the task on or funding it?
Best regards,
--
===========================================
Zoltan Szecsei PrGISc [PGP0031]
Geograph (Pty) Ltd.
P.O. Box 7, Muizenberg 7950, South Africa.
65 Main Road, Muizenberg 7945
Western Cape, South Africa.
34° 6'16.35"S 18°28'5.62"E
Tel: +27-21-7884897 Mobile: +27-83-6004028
Fax: +27-86-6115323 www.geograph.co.za
===========================================
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1191 / Virus Database: 1435/3395 - Release Date: 01/21/11
_______________________________________________
gdal-dev mailing list
gdal-dev@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/gdal-dev
