On Nov 27, 7:52 am, Klokan Petr Pridal <[EMAIL PROTECTED]> wrote:
> I prepared an online tool I was missing when I started to study how
> the tiling using Spherical Mercator runs in Google Maps, Virtual
> Earth, Yahoo Maps, OpenStreeMap and others... This tool can help you
> to understand how are thetilesreferenced and how they are stitched
> together in the browser.
>
> I think this Mashup could be an excellent starting point for people
> who are interested in this subject, because it contains all the math
> what you need for overlaying your own geodata from external sources:
> it can betilespre-generated by MapTiler/GDAL2Tiles following the
> OSGeo TMS recommendations, it can be raster data from WMS servers
> probably cached by TileCache, ortilesfrom MSR MapCruncher etc.
>
> The tool is excellent for fast debugging of tiling for particular
> area, because you can use the search for display thetilesof a given
> place.
>
> A transparent tile with correct coordinates is displayed for every
> original map tile by calling Google Chart API service.
>
> Whereever you click the longitude/latitude boundaries of the
> underlaying tile are displayed in WGS84 datum. Boundaries are also
> displayed in projected Mercator coordinates (EPSG:900913, EPSG:3785)
> and in pixels for active zoom level. This information is all you need
> for generating custom maptiles.
>
> The site contains also a Python script doing the coordinates and
> bounds calculation offline.
>
> So enjoy this
> mashup:http://www.maptiler.org/google-maps-coordinates-tile-bounds-projection/
>
> Best regards
>
> Klokan Petr Pridalhttp://blog.klokan.cz/
An excellent article. I have tried EPSG:3785 with the same "bbox"
parameters I use for EPSG:4326. It is not working:
www.polyarc.us/epsg
Apparently, it does not expect Lat/Lon coordinates. What is the
correct way to specify the "bbox" ?
Thanks very much.
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