[Proj] Re: Proj and Geoitiff

[Thomas Flemming]

Frank,

thanks a lot. It works perfect now.

Best regards,
Thomas Flemming



Frank Warmerdam wrote:
> Thomas Flemming wrote:
> 
>> Hello,
>>
>> does someone knows about the function GTIFGetProj4Defn from the 
>> geotiff-lib?
>>
>> I have geotiff-maps from
>> http://www.granit.sr.unh.edu/cgi-bin/nhsearch?dset=drg/drg162
>> which gives no complete proj-parameters from GTIFGetProj4Defn.
>>
>> Heres the output from listgeo.exe:
>>
>>
>> PCS = 32110 (name unknown)
>> Projection = 12830 ()
>> GCS: 4269/NAD83
>> Datum: 6269/North American Datum 1983
>> Ellipsoid: 7019/GRS 1980 (6378137.00,6356752.31)
>> Prime Meridian: 8901/Greenwich (0.000000/  0d 0' 0.00"E)
>> Projection Linear Units: 9003/(unknown) (1.000000m)
>>
>> PROJ.4 Definition: +ellps=GRS80 +units=us-ft
> 
> 
> Thomas,
> 
> Note, seeing the preceeding messages from listgeo can also be helpful.
> What you did supply is summary information extracted from the real keys.
> 
> I think the problem you are seeing is that the listgeo executable can't
> find the GeoTIFF .csv support files for looking up EPSG coordinate systems.
> Here I get the PROJ.4 string that looks like the following for EPSG:32110.
> 
>   +proj=tmerc +lat_0=42.5 +lon_0=-71.66666666666667 +k=0.999967 +x_0=300000
>       +y_0=0 +ellps=GRS80 +datum=NAD83 +units=m +no_defs
> 
> Setting the GEOTIFF_CSV environment variable to point to the directory
> with the csv files in it should do the trick.
> 
> Best regards,