From: David Zwarg <dzwarg@av...>  20080702 12:53:37

Yes! A false easting of 600000 ( "+x_0=60000" ) works like a charm  thanks for the tip. David On Tue, Jul 1, 2008 at 10:04 PM, Richard Greenwood < richard.greenwood@...> wrote: > The false easting (x_0) must always be in meters, even for coordinate > systems that are in feet. > > > On Tue, Jul 1, 2008 at 3:03 PM, David Zwarg <dzwarg@...> wrote: > > Hello, > > > > I am using proj4js, and I am having difficulty getting good projection > with > > a new projection definition. It is entirely possible that I don't have > the > > correct syntax for the definition file (or that I am totally missing > > something required), but it's giving results that are off by a factor of > 3 > > in 1 dimension (either X or Y, but not both). > > > > I am creating a definition for Pennsylvania State Plane, and this is the > > file EPSG2272.js: > > > > Proj4js.defs["EPSG:2272"] = "+proj=lcc \ > > +lon_0=77.75 \ > > +lat_0=39.33333333333334 \ > > +lat_1=39.9333333333333 \ > > +lat_2=40.96666666666667 \ > > +y_0=0.0 \ > > +x_0=1968500.00 \ > > +ellps=GRS80 \ > > +datum=NAD83 \ > > +nadgrids=@null +no_defs"; > > > > I searched in http://www.epsgregistry.org/, and those are correct > decimal > > degrees values. I try to transform the location of Philadelphia, PA ( > > 75.163808,39.951639 ), and I always get x:2189468, y:71889. I am > expecting > > something like x:2694800,y:236500. > > > > At first, I thought it was a ft/meter conversion, but when I add > > "+to_meter=0.3048006096012192" to the definition, the projected Y > coordinate > > looks good, but the X coordinate is way off. > > > > Any help would be greatly appreciated, > > Thanks, > > David > > > >  > > Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! > > Studies have shown that voting for your favorite open source project, > > along with a healthy diet, reduces your potential for chronic lameness > > and boredom. Vote Now at http://www.sourceforge.net/community/cca08 > > _______________________________________________ > > Mapbuilderproj mailing list > > Mapbuilderproj@... > > https://lists.sourceforge.net/lists/listinfo/mapbuilderproj > > > > > > > >  > Richard Greenwood > richard.greenwood@... > http://www.greenwoodmap.com >  David Zwarg Software Developer Avencia Incorporated http://www.avencia.com 