[OpenLayers-Users] combine 2 different projections map data

Aypes2 apestgas2 at yahoo.com.hk
Mon Jan 11 00:30:52 EST 2010


Forgot to say something. Now the overlay is loaded from database (not CAD
file). The problem appears with using postgis and oracle (same set of data).

Aypes2 wrote:
> 
> Hi all,
> 
> Thanks for your answers.
> 
> I can make an overlay to display over Google Map. 
> In Map file, I put "wms_srs"  "EPSG:2326" in WEB METADATA,
> "init=epsg:2326" in overall projection, and also "init=epsg:2326" in the
> overlay.
> In OP app, I use the MaxExtent in LonLat to show the layers.
> 
> However, some problems are appeared. The overlay has broken lines and even
> display offset (which should be one line only) in certain zoom level. Also
> the overlay has a little bit wrong in position. 
> But when I use Quantum GIS to check the overlay, there is no broken line.
> 
> I have projected my overlay to get the LonLat using EPSG2326, but how can
> I reproject it using epsg:900913 once more? With Proj4js, I just know how
> to transform one point but not a layer.
> 
> Thanks,
> Aypes2
> 

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