[gdal-dev] Geomedia mdb files

Angelos Tzotsos gcpp.kalxas at gmail.com
Sat Jan 22 10:58:27 EST 2011


Hi Even.

Good work.
I can provide a sample mdb file made from GeoMedia. Is there any 
particular shapefile, you would like me to translate?
Perhaps we can include the US Sample Data as provided by Intergraph.

Best regards,
Angelos

On 01/22/2011 05:42 PM, 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,
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-- 
Angelos Tzotsos
Remote Sensing Laboratory
National Technical University of Athens
http://users.ntua.gr/tzotsos



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