Comments on: Using Google Ditu maps with Satellite imagery for China http://highearthorbit.com/using-google-ditu-maps-with-satellite-imagery-for-china/ Transmitting ideas, observations, and images from 42,000 km. Fri, 22 Aug 2008 02:42:15 +0000 http://wordpress.org/?v=2.6 By: Andrew http://highearthorbit.com/using-google-ditu-maps-with-satellite-imagery-for-china/#comment-190664 Andrew Mon, 23 Jun 2008 12:58:44 +0000 http://highearthorbit.com/using-google-ditu-maps-with-satellite-imagery-for-china/#comment-190664 @karl - the problem is that the tilesets are in different coordinate reference systems. This is the method of converting the spherical latitude & longitude to a flat image. Google Ditu uses B-54 (Guass-Krueger), while Google Maps is a Spherical Mercator, or "Web Mercator" known as EPSG:3785 So what has to happen is a warping would occur to get the two images to overlay properly. @karl - the problem is that the tilesets are in different coordinate reference systems. This is the method of converting the spherical latitude & longitude to a flat image.

Google Ditu uses B-54 (Guass-Krueger), while Google Maps is a Spherical Mercator, or “Web Mercator” known as EPSG:3785

So what has to happen is a warping would occur to get the two images to overlay properly.

]]> By: karl http://highearthorbit.com/using-google-ditu-maps-with-satellite-imagery-for-china/#comment-190654 karl Mon, 23 Jun 2008 11:08:15 +0000 http://highearthorbit.com/using-google-ditu-maps-with-satellite-imagery-for-china/#comment-190654 Hi, I noticed in your Beijing example that the streets in the ditu maps don't line up properly with the streets in the satellite imagery. Is there some way to apply an offset, so that they line up better? thanks! Hi,
I noticed in your Beijing example that the streets in the ditu maps don’t line up properly with the streets in the satellite imagery. Is there some way to apply an offset, so that they line up better?
thanks!

]]> By: Andrew http://highearthorbit.com/using-google-ditu-maps-with-satellite-imagery-for-china/#comment-145510 Andrew Wed, 30 Jan 2008 03:53:16 +0000 http://highearthorbit.com/using-google-ditu-maps-with-satellite-imagery-for-china/#comment-145510 Hi Vanja - sorry about the confusion. I updated the front page of Mapstraction.com, but not the rest of the trac and wiki. The mailing list has moved to: http://lists.mapstraction.com/listinfo.cgi/mapstraction-mapstraction.com Definitely send any/all your questions to the list and we'll help you out. Hi Vanja - sorry about the confusion. I updated the front page of Mapstraction.com, but not the rest of the trac and wiki.

The mailing list has moved to:
http://lists.mapstraction.com/listinfo.cgi/mapstraction-mapstraction.com

Definitely send any/all your questions to the list and we’ll help you out.

]]> By: Vanja http://highearthorbit.com/using-google-ditu-maps-with-satellite-imagery-for-china/#comment-145412 Vanja Tue, 29 Jan 2008 21:00:11 +0000 http://highearthorbit.com/using-google-ditu-maps-with-satellite-imagery-for-china/#comment-145412 Hi! Sorry to barge in on you like this, but I've been poking around mapstraction for a while, and there are a bunch of questions I just can't seem to find an answer to. Anyway, I've even tried to find the mailing list but to no avail. The one referenced on http://mapstraction.com/trac does not exist. So, if you could be so kind to nudge me in the right direction, that would be great! Thank you for your time! Kind regards, Vanja Hi!

Sorry to barge in on you like this, but I’ve been poking around mapstraction for a while, and there are a bunch of questions I just can’t seem to find an answer to. Anyway, I’ve even tried to find the mailing list but to no avail. The one referenced on http://mapstraction.com/trac does not exist. So, if you could be so kind to nudge me in the right direction, that would be great!

Thank you for your time!
Kind regards, Vanja

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