Comments on: Combining Google Maps and Google Ditu http://blog.anthonywong.net/2007/06/05/combining-google-maps-with-google-ditu/ Imagine Tue, 06 Jan 2009 21:22:51 +0000 http://wordpress.org/?v=2.6.3 By: Rupert http://blog.anthonywong.net/2007/06/05/combining-google-maps-with-google-ditu/#comment-22833 Rupert Tue, 12 Feb 2008 04:57:35 +0000 http://blog.anthonywong.net/2007/06/05/combining-google-maps-with-google-ditu/#comment-22833 The reason that the Google Ditu is shifted is because of government security restrictions. As noted by Anthony, the shift is dependent on the Gzoom levels (particularly zoom levels 17,18...). However, I am unaware if both Google Maps and Google Ditu have the same projection. Assuming it is, then you can overlay points on Google Ditu correctly. I am pretty sure that Google Maps projection is reflected as 900913 or Google Spherical Mercator. This means, you can still georeference a WGS84(lon/lat) point taken from your Garmin or any GPS equipment in Google Maps. I could go on and on here, but instead just read my blog post, "OpenLayers + Google Spherical Mercator", http://www.gisnotes.com/wordpress/?p=129 . If you need more information, you can contact me offlist. Anthony, interesting posts you have here! Looking forward to reading more of your posts while Im still in Beijing. References: www.spatialreference.org The reason that the Google Ditu is shifted is because of government security restrictions. As noted by Anthony, the shift is dependent on the Gzoom levels (particularly zoom levels 17,18…). However, I am unaware if both Google Maps and Google Ditu have the same projection. Assuming it is, then you can overlay points on Google Ditu correctly.
I am pretty sure that Google Maps projection is reflected as 900913 or Google Spherical Mercator. This means, you can still georeference a WGS84(lon/lat) point taken from your Garmin or any GPS equipment in Google Maps. I could go on and on here, but instead just read my blog post, “OpenLayers + Google Spherical Mercator”, http://www.gisnotes.com/wordpress/?p=129 . If you need more information, you can contact me offlist.

Anthony, interesting posts you have here! Looking forward to reading more of your posts while Im still in Beijing.

References: http://www.spatialreference.org

]]> By: Hatron http://blog.anthonywong.net/2007/06/05/combining-google-maps-with-google-ditu/#comment-22797 Hatron Tue, 05 Feb 2008 09:02:34 +0000 http://blog.anthonywong.net/2007/06/05/combining-google-maps-with-google-ditu/#comment-22797 Hi Anthony, I used your code and successfully done a mashup. But as you said, the Ditu Google map is shifted, can you suggest a way that we can plot a GPS location of WGS84 on a ditu map? Even though would you simply suggest a company or a government department that we can talk to? Anyway, well done to your contribution. Many thanks, Hatron Hi Anthony,

I used your code and successfully done a mashup. But as you said, the Ditu Google map is shifted, can you suggest a way that we can plot a GPS location of WGS84 on a ditu map? Even though would you simply suggest a company or a government department that we can talk to?

Anyway, well done to your contribution.

Many thanks,
Hatron

]]> By: Collie http://blog.anthonywong.net/2007/06/05/combining-google-maps-with-google-ditu/#comment-22579 Collie Fri, 11 Jan 2008 08:12:23 +0000 http://blog.anthonywong.net/2007/06/05/combining-google-maps-with-google-ditu/#comment-22579 Hi Anthony, Can you please contact me by email. I am very interested to recreate the mashup as above with a ditu button, but I am running into some problems regarding the code. I woul appreciate it if you could point me in the right direction or pass me on your code snippet. I am interested in creating routes like the point and click method using google maps. thanks Collie Hi Anthony,

Can you please contact me by email. I am very interested to recreate the mashup as above with a ditu button, but I am running into some problems regarding the code.
I woul appreciate it if you could point me in the right direction or pass me on your code snippet.
I am interested in creating routes like the point and click method using google maps.
thanks
Collie

]]> By: 我要去桂林 http://blog.anthonywong.net/2007/06/05/combining-google-maps-with-google-ditu/#comment-22533 我要去桂林 Sat, 01 Dec 2007 12:44:58 +0000 http://blog.anthonywong.net/2007/06/05/combining-google-maps-with-google-ditu/#comment-22533 great, very thanks you . last friday , I goto goole china office, they said will make a big improvement with google ditu. great,

very thanks you .

last friday , I goto goole china office, they said will make a big improvement with google ditu.

]]> By: 王串儿 http://blog.anthonywong.net/2007/06/05/combining-google-maps-with-google-ditu/#comment-22322 王串儿 Thu, 08 Nov 2007 11:11:58 +0000 http://blog.anthonywong.net/2007/06/05/combining-google-maps-with-google-ditu/#comment-22322 Anthony, thanks for the post. Can you provide step-by-step instructions for combining Google Maps and Google Ditu? Anthony, thanks for the post. Can you provide step-by-step instructions for combining Google Maps and Google Ditu?

]]> By: anthony http://blog.anthonywong.net/2007/06/05/combining-google-maps-with-google-ditu/#comment-21547 anthony Mon, 17 Sep 2007 11:05:54 +0000 http://blog.anthonywong.net/2007/06/05/combining-google-maps-with-google-ditu/#comment-21547 It depends on which zoom level you are on. Google Ditu is a few hundred meters to the right from the correct position. It depends on which zoom level you are on. Google Ditu is a few hundred meters to the right from the correct position.

]]> By: Ken http://blog.anthonywong.net/2007/06/05/combining-google-maps-with-google-ditu/#comment-21385 Ken Wed, 05 Sep 2007 04:57:21 +0000 http://blog.anthonywong.net/2007/06/05/combining-google-maps-with-google-ditu/#comment-21385 Can you advise how many pixels has google ditu shifted from google maps? Can you advise how many pixels has google ditu shifted from google maps?

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