[OSM-talk] gdalwarp question

[Juan Lucas Dominguez Rubio]

> Hello, i have an image that can be wrapped around
> a sphere, its x / y coordinates directly map to latitude / longitude.

What do you mean by that?
Do you mean that when you open it with some GIS app, the status bar tells the correct (lat, lon) of the place where the mouse is?
Some GIS apps reproject raster files by default without explicitly letting the user know. Use this utility and tell us the output:

gdalinfo <filename>

> Is that enough information to tell the SRS of that image?

Strictly, no, but if we talk about (lat, lon), the EPSG:4326 coordinate system is by far the most common, so if your coordinates are originally in (lat, lon), they are very likely to be in EPSG:4326.

> Background is that i'd like to transform that image so it matches
> the SRS used in osm.xml.  Would that be WGS84?  Or is it called
> epsg:4326?  (Do they mean the same?)

Yes, informally, when people say WGS84 they mean EPSG:4326. Ask Mr Google or the wikipedia for details....

> Thanks for any hints, Torsten.


Regards
Juan Lucas

 

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