Further on this after contacting help at MapCruncher: -- You’re registering a map at the scale of the entire United States. Your input map is in a different projection than the output map, but you’ve only provided MapCruncher with enough points to do an affine projection. Your input map needs to be “stretched” in more subtle ways to get things to line up better. Try adding about four or five more points in the middle areas of the map – since it looks like you have lat/long grids, then just a simple grid of nine points should work nicely. That should give MapCruncher enough information to distort the lines of latitude to correct the problem you’re seeing.
MapCruncher’s reprojection technique is an approximation, and thus will always introduce some error, but at the scale of your map, you should be able to eliminate most of it by going from the simple affine transform to a quadratic transform, which MapCruncher does automatically once you’ve supplied enough correspondence points. -- However i'm wondering now how the KML is auto corrected when shown on google maps? and how to do something via just using that file what I might need to do? Hopefully this is helpful to someone in the future.. as it's been a few days of research to get to this point with little help. On Dec 20, 10:26 pm, Pete <[email protected]> wrote: > same results... > > On Dec 20, 8:33 pm, Grok Lobster <[email protected]> wrote: > > > > > > > > >http://research.microsoft.com/en-us/um/redmond/projects/mapcruncher/ > > > On Dec 20, 11:24 am, Pete <[email protected]> wrote: > > > > I have an Image from a KML file, and when using google maps with the > > > KML it auto-zooms it to zoom level 4. The image itself is far larger > > > than just overlaying it at zoom level 4 so I'm trying to understand > > > how to re-size the image for different zoom levels (as the KML > > > automatically does). > > > > So far I've taken the Lat / Lng and created a box from the NW and SE > > > corners, than converted those points to pixels, and used that for the > > > size of the image (IE at zoom level 5 > > > > NWlat = '50.406626367301044'; > > > NWlng = '-127.620375523875420'; > > > > SElat = '21.652538062803'; > > > SElng = '-66.517937876818'; > > > > produce points: > > > 1191,2763 and 2582,3591 > > > > finding 'supposed dimensions' of that image than are: > > > 1391 x 828 > > > > However when re-sizing my image to this, it not only distorts the > > > image (stretches it a bit more vert than it should), it doesn't seem > > > to line up with my KML test at zoom level 5. the KML image is still > > > stretched about 30-50 extra pixels in height. I'm trying to > > > understand where I might be going wrong with my calculations.. Could > > > anyone give me a hand please? > > > > Thank you.. -- You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" 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-js-api-v3?hl=en.
