On Friday 20 May 2011 22:44:30 Mike Ryan wrote: > On Fri, May 20, 2011 at 09:30:37PM +0100, Fred Labrosse wrote: > > On Friday 20 May 2011 21:03:56 Fred Labrosse wrote: > > Obviously, I hate doing that, as soon as posting I found it. GeoRef is > > the type. Still trying to understand what I need to specify, but I'll > > find it. > > If your maps aren't already georef'd, it's troublesome to find the > correct values to use. > > For reference, the four values are: > > * meters per pixel in X direction > * meters per pixel in Y direction > * UTM X of top left map corner > * UTM Y of top left map corner > > You'll note that there's no UTM zone. This doesn't matter on a small > enough scale.
But probably implies local adjustments? That would explain some discrepancies in scale I am seeing. In theory I should have 5 meters per pixel but end up having to say 7 for a better match. All these local adjustments will render my automation quite difficult. Ideally, I would like to cover an area that is roughly 250km x 250km... Fred > > I wrote a collection of scripts that triangulate the correct set of > values from three lat/lon->x/y pairs, but they're nowhere near usable > for the general public. If you're handy with maxima (the mathematica > clone) let me know and I'll ship them your way. ------------------------------------------------------------------------------ What Every C/C++ and Fortran developer Should Know! Read this article and learn how Intel has extended the reach of its next-generation tools to help Windows* and Linux* C/C++ and Fortran developers boost performance applications - including clusters. http://p.sf.net/sfu/intel-dev2devmay _______________________________________________ Viking-devel mailing list Viking-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/viking-devel Viking home page: http://viking.sf.net/
