Hi Ralph,
I would use an OpenMap map to figure out coordinates of features on
the Google map image, using the VPF VMAP level 0 boundary data (you
can download VMAP from
http://geoengine.nima.mil). Once you figure
out the Google map image degree/pixel to zoom ratio, you can figure
out the coordinates of the upper left and lower right corners of the
image. Then, you can tell the OpenMap LLXY projection to give you
the scale for those corners.
Hope this helps,
Don
On Mar 9, 2006, at 11:36 PM, ralph yozzo wrote:
> I apologize if this is a crazy question but I want to place points
> on a
> google map manually on the server side because our target browser
> does not
> have javascript.
>
> So I grab the image from google e.g.,
> http://maps.google.com/mapdata?
> latitude_e6=40611075&longitude_e6=-73984219&z
> m=10000&w=200&h=200&cc=US&min_priority=2 is an image
> I know it's width and height in pixels and the zoom level is 10000
>
> My question is given another point (latitude, longitude) how can I
> project
> it on the map in general.
>
> I'm using
> float scale = zoom*fudgefactor; // not sure what the
> relationship
> is between the google map zoom level and the bbn scale value.
> com.bbn.openmap.LatLonPoint center = new
> com.bbn.openmap.LatLonPoint(latx, longx);
> com.bbn.openmap.proj.LLXY llxy = new
> com.bbn.openmap.proj.LLXY(center, scale, w, h);
>
> My basic question is what the relationship is between the google
> map zoom
> level and the bbn scale value?
>
> Or is there a better way?
>
>
> I use forward to get the x, y in pixels to draw one of the markers
> java.awt.Point p = llxy.forward(latitude, longitude);
> graphics2D.drawImage(imagemarker, (int)p.getX(),
> (int)p.getY(), null);
>
> Then, I draw the marker.
>
> The problem is the I don't know what to set the scale to.
>
> Any help would be appreciated.
>
> The documentation on google zoom is pretty sparse.
>
> Ralph
>
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Received on Wed Mar 22 2006 - 10:51:42 EST