[Qgis-user] Reprojection to 900913 in Qgis

[cfarmer]

Kuja,

In order to create a valid custom projection, your proj4 string must have
an ellps entry. Be sure that you are using the correct proj4 string
format.

http://www.remotesensing.org/proj/

Cheers,

Carson

> Hi all,
>        I have some shp file in epsg:4326 and I want to repojeciton them to
> 900913, google's coordinate system. Because there are so many of them,
> using
> org2org to convert  them  might be a big  project.
> So I put
> "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0
> +k=1.0 +units=m +nadgrids=@null +no_defs <>" in custom projection. But a
> warning message showed that there must be a "ellips=".
>
> Then I added the
> # Google Mercator
> <900913> +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0
> +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs <>
> to epsg file. Still, the Google Mercator didn't show up in projection
> select
> window.
>
> I googled for a while, some old posts suggested add it to srs.db. But I
> have
> no idea how to do so.
> Besides, I found little imformation about it through  the net. Is it just
> a
> silly question? Any helpful information would be appreciated.
>
>
>
> regards
>
> Kuja
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>


Carson Farmer
Spatial Pattern Analysis & Research Lab (SPAR)
Department of Geography, University of Victoria
PO Box 3050 STN CSC
Victoria, BC, V8W 3P5,Canada
www.geog.uvic.ca/spar
cfarmer at uvic.ca