Hi Martin, > >In GeoTools 2.x, the Krovak projection was defined with the following >supplemental parameters, which are specific to ESRI: > > X_Scale > Y_Scale > XY_Plane_Rotation > >A hack has been created in order to support those parameters, because the >"clean" fix was difficult to applies on GeoTools 2.x. > >In geotidy, the work with affine transforms (mentioned in yesterday emails) >allows a clean support of those ESRI parameters (actually it was one of the >major motivation behind that work). > >A side effect is that the support for those 3 parameters can trivialy be >extended to all projections, not just the Krovak projection. So my question is: >is it something that ESRI does? Is it something that we should do? >
Good news :-) I know that Krovak is little bit bizzare. I don't know about other projections, but in Krovak X_Scale = -1 has same meaning as changing the AXIS parameter from EAST to WEST in GeoTools. The issue is that AFAIK ESRI is ignoring the AXIS parameter (correct me if I'm wrong). From perspective of Krovak the X/Y-scale and XY_Plane_Rotation parameters are applied after whole projection. What I'm just not sure is how to handle the case if referencing package will pickup the correct axis direction parameters (e.g. Southing westing that are ignored by ESRI) and then it applies the ESRI parameters (X_scale... ) - then same wkt might be interpreted in different way by, both products - but I don't know if this can be solved in clean way. Jan. ------------------------------------------------------------------------------ SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ _______________________________________________ Geotools-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-devel
