On Apr 24, 7:13 am, "[email protected]" <[email protected]> wrote: > Is the some place that has the formulas that these SPC x/y systems are > based on?
there's the classic book "Map Projections, A Working Manual" by USGS, which is a 20megabyte pdf available at: http://pubs.er.usgs.gov/djvu/PP/PP_1395.pdf page 52 has the table which defines which projection is used for each State Plane. The formulas are based on the earth as an ellipsoid, not a sphere, so there's no closed-form formula for reverse transformation (from projection to latlng). This requires iteration using taylor series to convert the coordinates. Not a simple task! -- You received this message because you are subscribed to the Google Groups "Google Maps API" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-maps-api?hl=en.
