[GRASS5] r.in.png error?

Markus Neteler neteler at itc.it
Thu Sep 2 09:04:08 EDT 2004

On Thu, Sep 02, 2004 at 01:24:45AM +0100, Glynn Clements wrote:
> David Piasecki wrote:
> > I used the PNG driver in GRASS to create a PNG image from my data. I 
> > verified that the PNG image exists, and I can view it with any app 
> > capable of reading the PNG format. I have not modified the region, and 
> > I have verified that it is the same as when I originally created the 
> > PNG file. However, when I attempt to import the PNG file using 
> > r.in.png, I get the following error...
> > 
> > 640 x 480 image, 8 bits palette+transparency // this is just extra 
> > since I had the verbose option on
> > WARNING: G_set_window(): Illegal latitude for North
> > ERROR: Unable to set window
> > 
> > Is there a way around this error?
> This is a known issue with importing rasters into a lat/lon location. 
> Unless the raster has georeferencing information (and the importer can
> use it; AFAIK, this is currently only true of r.in.tiff and
> r.in.gdal), rasters are imported with the bottom-left corner at (0,0)
> and the top-right corner at (W,H), where W and H are the width and
> height of the raster.
> In this case, r.in.png is trying to set the top-right corner of the
> region to (640,480), which isn't valid for a lat/lon location.
> A workaround is to change the location's projection to X/Y with
> g.setproj, import the raster, set its boundaries with r.region, then
> change the location back to lat/lon.
> Ultimately, someone needs to change the various r.in.* programs to
> handle this situation.
> -- 
> Glynn Clements <glynn.clements at virgin.net>

Please make it a bug report in case it isn't already there.


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