Brent, Great suggestions, thanks!
You said, "The key to this working is knowing the coordinate reference system of your source data" and I'm a little confused. Are you assuming there must be an actual place on earth this data is referenced to? Just to clarify: there is none, it's not that I can't find it. The features were created just so they would look good on the screen, not with any reference to actual coordinates. Does this clarification change anything you suggested? Thanks again! Brent Wood wrote: > Hi Kurt, > > If you can work out what the projection system is for your data, then Proj.4 > can do the conversion for you. > > Note that it is likely to be easier to use ogr2ogr (part of GDAL) as this can > use the proj.4 libraries to reproject data, but can also read/write > shapefiles so you could generate reprojected shapefiles directly from your > original shapefile. > > The key to thi working is knowing the coordinate reference system of your > source data. > > If this infomation is not available, then some sort of manual coordinate > transformation may be possible, based on your suggested approach of working > from visually determined points, but I'd use this approach as a last resort, > especially if any sort of accuracy is required. > > see: http://www.gdal.org/ > > > > Cheers, > > Brent Wood > > Brent Wood > DBA/GIS consultant > NIWA, Wellington > New Zealand >>>> Kurt Heston <[email protected]> 05/11/09 10:22 AM >>> > I've inherited a set of shape files that are not georeferenced. The > upper left corner of the extent is on 0/0 lat/lon. So, when I try to > view them after translating to KML, for example, they show up in the > middle of the Atlantic Ocean. > > Is there any way in OpenJump that I can fix them? There's about a 130k > polygons involved with lots of attributes that I'd like to forego > re-creating if I can. > > If I use a survey-grade GPS or Google Earth to match a bunch of points > in these shapefiles to their true locations on Earth, can something > move/stretch/skew/scale them to their earthly positions? This HAS to > have been done at some point with all the non-geo CAD stuff that existed > b4 geo-spatial tooling took hold, right? > > I'm hoping there's a tool I've missed (in much Googling) that I can use > to correlate the two. I'm guessing that if such a tool is available, > it's going to take A LOT of point matches to fix the files, but that > scares me less than re-creating the data in its entirety. > > Can anyone send me in the right direction here? > _______________________________________________ > jump-users mailing list > [email protected] > http://lists.refractions.net/mailman/listinfo/jump-users > > NIWA is the trading name of the National Institute of Water & Atmospheric > Research Ltd. _______________________________________________ jump-users mailing list [email protected] http://lists.refractions.net/mailman/listinfo/jump-users
