[gdal-dev] ogr2ogr vector central meridian change, vector offset issue.

[Ilia Koen]

Hi Even,
    I was using ogr2ogr version : GDAL 1.6.3, released 2009/11/19. I had 
updated to 1.8 and the issue was a re-sourcing my path.

The following command worked.
ogr2ogr -wrapdateline -s_srs '+proj=cea +lon_0=-160 +lat_ts=0 +x_0=0 
+y_0=0' -t_srs EPSG:4326 reefPoly28.shp reef_500_poly.shp

     Thanks for trying the data and letting me know that it worked on 
your system. It really helped solve the problem.

Best ik.



On 3/6/11 5:47 PM, Even Rouault wrote:
> Ilia,
>
> Try adding -wrapdateline to your command line. The wrapdateline option
> instructs ogr2ogr to split geometries crossing the dateline meridian. I've
> just tested it successfully on one of those datasets.
>
>> Hello,
>>       We are trying to re-project the coral reef dataset via ogr2ogr for
>> the dataset to fit the bluemarble projection. The coral reef is a vector
>> shape dataset and it is using the Lambert Cylindrical Equal Area at -160
>> central meridian. Once we re-project we are getting lines connecting the
>> shapes that are cutoff at the edges from -180 to 180. Is that a bug ?
>> or  are we doing something wrong?
>>
>> You can see the offset issue here
>> http://dukodestudio.com/client_room/coralreefs/coralReefData-offsetlineissu
>> e.png
>>
>>
>> Here is the location of the dataset
>> http://www.wri.org/publication/reefs-at-risk-revisited#datasets
>>
>> Our command is as follows:
>> ogr2ogr  -s_srs '+proj=cea +lon_0=-160 +lat_ts=0 +x_0=0 +y_0=0' -t_srs
>> EPSG:4326 reefPoly28.shp reef_500_poly.shp
>>
>> We did try to use the "-spat -180 -90 180 90" flag with the above commnd
>> but without success.
>>
>> Thanks, ik.
>>
>>
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