On Sat, Jul 21, 2007 at 11:43:42AM -0400, we recorded a bogon-computron collision of the <[EMAIL PROTECTED]> flavor, containing: > This morning, I found myself zooming out so I could identify a point on the > other side of the world. (xastir is so much more convenient than my old > world atlas!) > When I zoomed out, however, I found that the tigermap.geo data was quite > distorted when overlayed with the flat mercator projection of worldhi.map
Yes. This is well known, and is a result of the sinusoidal projection used by the tigermap server. What's actually happening is that the image is in a different coordinate system than the one that Xastir uses, but Xastir plunks it down on the screen as if registering the corner points is sufficient. It isn't. There is nothing to be done about it, shy of not using tigermap.geo to view large areas. The TIGER/Line shapefiles are not subject to this problem. I have no idea why the folks who wrote the tigermap server chose to use the sinusoidal projection, but without significant recoding effort in xastir (to reproject the images) there's no way to get them to work at high zoom levels. Note that the distortion you see is actually always present, but not as noticable at the close zoom levels. -- Tom Russo KM5VY SAR502 DM64ux http://www.swcp.com/~russo/ Tijeras, NM QRPL#1592 K2#398 SOC#236 AHTB#1 http://kevan.org/brain.cgi?DDTNM "And, isn't sanity really just a one-trick pony anyway? I mean all you get is one trick, rational thinking, but when you're good and crazy, oooh, oooh, oooh, the sky is the limit!" --- The Tick _______________________________________________ Xastir mailing list [email protected] http://lists.xastir.org/cgi-bin/mailman/listinfo/xastir
