[Qgis-user] Support for (wrong) GEOCOVER projection for S hemisphere in qgis

[Micha Silver]

Hi Agus:
I am actually able to do just that. I also am using some Landsat 
GEOCover images from below the equator, projected, as you say in UTM 39_N_.
I load the raster, set the project CRS to that (UTM Northern) 
projection, and enable OTF projection. Then I can overlay vector layers, 
which are WGS84 Lon-Lat., and they are correctly located.

It's usually not very helpful to say "works for me" but...
Anyway, HTH,
Micha

 
Agustin Lobo wrote:
> The global set of Landsat images on GEOCOVER
> https://zulu.ssc.nasa.gov/mrsid/mrsid.pl
> is on UTM/WGS projection
> but with the Southern hemisphere tiles as UTM zones in the N with
> negative coordinates. For example, a tile that should be at 18S is
> actually 18N with negative coordinates
> ("Non-standard UTM definition: For the southern hemisphere, the 
> GeoTiff files
>   contain positive zone numbers with negative northing coordinates")
> https://zulu.ssc.nasa.gov/mrsid/docs/GeoCover_circa_2000_Product_Description.pdf 
>
>
> As we have some vector layers on geographic coordinates WGS84 and a 
> Geocover tile for 18S,
> I've set the project as 18S, enabled CRS reprojection on the fly, and set
> the raster CRS to 18N. Unfortunately, QGIS does not display the 
> raster, even
> selecting zoom to layer extent. (Using Mimas).
>
> This is probably not a problem of QGIS, the Geocover projection is 
> just wrong,
> but would like to know if there could be a way to circumvent this 
> problem to
> be able to use GEOCOVER tiles of the S hemisphere within QGIS.
> A way could be making a world file with the Georeferencer plugin, but 
> perhaps
> there is a more general way.
>
> Thanks
>
> Agus
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