[GRASS-user] importing dem files: projection details?

[Tyler Smith]

On 03/15/2010 03:42 AM, Markus Neteler wrote:
> The rule is that you can have only one projection in a location.
> If you have several projections you need several locations and
> to reproject data between them (r.proj, v.proj).
>
> GRASS can generate locations directly from metadata.
>
>    
So far, I've failed to convince GRASS to do anything directly.

Trying the auto route:

grass64 -gui
select define new location with georeferenced file
select the dem file: k42.dem
select the TN transformation, as probably better than the default for 
adjacent Kentucky
enter GRASS with the newly created location and the PERMANENT mapset

Results in this error:

"g.proj or projection error: ERROR: default region is invalid
     line 3: <north: 1080:43:46N>"

So GRASS has automatically set up the location using degrees, and then 
get confused when the raster co-ordinates are provided in meters. Which 
appears to be fairly close to the sort of problem I ran into when 
setting this up manually. What am I missing?

Thanks,

Tyler




> Cheers
> Markus
>
>    
>> Thanks,
>>
>> Tyler
>>
>>
>> -PROJ_INFO-------------------------------------------------
>> name       : Lambert Conformal Conic
>> datum      : nad83
>> nadgrids   : TN
>> proj       : lcc
>> ellps      : grs80
>> a          : 6378137.0000000000
>> es         : 0.0066943800
>> f          : 298.2572221010
>> lat_0      : 36.3333333300
>> lat_1      : 38.6666666670
>> lat_2      : 37.0833333330
>> lon_0      : -85.7500000000
>> x_0        : 1500000.0000000000
>> y_0        : 1000000.0000000000
>> -PROJ_UNITS------------------------------------------------
>> unit       : meter
>> units      : meters
>> meters     : 1.0
>>
>>
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>>
>>
>>      

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