[gdal-dev] gdal_translate for Lambert Conformal Conical

[Paul Spencer]

I think you should be using the lcc coordinates of the corners instead  
of degrees, then it should be fine.

Cheers

Paul

On 26-Jun-08, at 3:59 PM, Gen Shibayama wrote:

> Hi Paul,
>
> Thanks for the info. I also found much more stupid mistake (I typo'ed
> lcc as llc).
>
> Lowercase epsg didn't work either, but I think that's ok as long as I
> have one way to accomplish what I need to do.
>
> Yes, my png file is in the lcc projection, and I just need to add
> geotiff information for now. Untimately, I'll further process the file
> with gdalwarp and convert it into EPSG 4326 coordinate system, and
> overlay the image on Google Earth.
>
> Here is the png file.
>
> http://www.soaringsearch.com/files/test.png
>
> Now I realized another problem. My current command line is as follows.
> As you can see from the image, all four corners are on different lats
> and longs, but I can specify only Upper Left and Lower Right with
> -a_ullr option.
>
> $ gdal_translate -of GTiff -co INTERLEAVE=PIXEL  -a_ullr 41.5569
> -121.9248 32.9250 -112.9434 -a_srs '+proj=lcc +lon_0=-95 +lat_1=25
> +lat_2=25' test.png dest.tif
>
> Am I doomed?
>
> -Gen
>
> On Thu, Jun 26, 2008 at 12:38 PM, Paul Spencer <pagameba at gmail.com>  
> wrote:
>> Gen,
>>
>> is your png file already in the lcc projection and you are just  
>> trying to
>> assign the projection to it?
>>
>> Your first proj string looks suspicious to me, I suspect 90w should  
>> be -90
>> and 25n should be just 25
>>
>> Your second proj string should use lower case 'epsg' - this is  
>> because epsg
>> is actually the name of a proj dictionary and 9801 is the value to  
>> look up
>> in that dictionary - the dictionary is in lower case and this is  
>> important
>> on linux systems.
>>
>> Cheers
>>
>> Paul
>>
>> On 26-Jun-08, at 1:17 PM, gen wrote:
>>
>>> Hello,
>>>
>>> I'm trying to create a geotiff file from PNG map file which uses
>>> Lambert Conformal Conical coordinate system, and hitting a road  
>>> block.
>>>
>>> $ gdal_translate -of GTiff -co INTERLEAVE=PIXEL -a_ullr 41.5569
>>> -121.9248 32.9250 -112.9434 -a_srs '+proj=llc +lon0=90w +lat_0=25n
>>> +lat_1=25n' test.png dest.tif
>>> Failed to process SRS definition: +proj=llc +lon0=90w +lat_0=25n
>>> +lat_1=25n
>>>
>>> $ gdal_translate -of GTiff -co INTERLEAVE=PIXEL -a_ullr 41.5569
>>> -121.9248 32.9250 -112.9434 -a_srs EPSG:9801 test.png dest.tif
>>> ERROR 6: EPSG PCS/GCS code 9801 not found in EPSG support files.  Is
>>> this a valid
>>> EPSG coordinate system?
>>> Failed to process SRS definition: EPSG:9801
>>>
>>> Any idea what I am missing?
>>>
>>> I downloaded gdal as part of FWTools package http://fwtools.maptools.org/
>>>
>>> Thanks in advance,
>>> -Gen
>>> _______________________________________________
>>> gdal-dev mailing list
>>> gdal-dev at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>>
>>