Hello all,
The same re-projection issue is not fixed by the -wrapdateline .
Here is a screenshot of the issue
http://dukodestudio.com/client_room/coralreefs/robinson_projection-offsetlineissue.png
This is used to reproject the bluemarble.
gdalwarp -s_srs EPSG:4326 -t_srs '+proj=robin +lon_0=-90 +x_0=0 +y_0=0'
world.topo.200407.3x5400x2700.geo.tif
world.topo.200407.3x5400x2700.robin(-90).tif
and this to re- project the countries outline to the robinson projection.
ogr2ogr -overwrite -wrapdateline -s_srs EPSG:4326 -t_srs '+proj=robin
+lon_0=-90 +x_0=0 +y_0=0' -spat -180 -90 180 90 countries_robin.shp
countries.shp
Is it possible to fix the offset lines with some sort of processing in
gdal ?
I was thinking that one way to fix this is to rasterize the countries
outline while at EPSG:4326 and then warp it to the robinson projection.
But then I will loose the vectors to rasters.
Any suggestions or work practices are welcome !
Best ik.
On 3/6/11 3:24 PM, Ilia Koen wrote:
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-offsetlineissue.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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