[OSGeo Africa] converting shapefile to get Google extent

[Solly Vuso]

Thank you so much Hanlie
On 12 Oct 2013 3:11 AM, "Hanlie Pretorius" <hanlie.pretorius at gmail.com>
wrote:

> Hi Solly,
>
> I get the following values for the extents in the two coordinate
> reference systems:
>
> WGS 84: xMin,yMin 22.7357,-34.2139 : xMax,yMax 30.1947,-30.0018
>
> EPSG:3857: xMin,yMin 2530931.00,-4057554.48 : xMax,yMax
> 3361260.85,-3503781.21
>
> So the coordinates you gave are in WGS 84 decimal degrees, not the
> Google projection (our two sets of values are probably slightly
> different because we're not using the same shapefile; I'm using the
> Municipal Demarcation Board's data).
>
> To reproject the shapefile from WGS84 to Google projection, I
> right-cllicked the file, selected Save as... and clicked Browse... in
> the CRS section.
>
> Then I typed EPSG:3857 into the Filter text box and saw WGS84 / Pseudo
> Mercator in the description. I selected that CRS (only one should be
> visible) and clicked OK.
>
> When you open the reprojected shapefile and zoom to the layer (without
> reproject on the fly enabled), you should see coordinates in the range
> I quoted above.
>
> Hope this helps.
>
> Cheers
> Hanlie
>
> 2013/10/11, Solly Vuso <sollyvuso at gmail.com>:
> > Thank you Hanlie
> >
> > It does work after I followed your instruction but it zoom very close
> even
> > though I used the provincal extent , I think I am still missing something
> > here.
> >
> > This is what I see on the metadata
> >
> > xMin,yMin 22.7357,-34.2139 : xMax,yMax 30.1947,-30.0018
> >
> >
> > On Thu, Oct 10, 2013 at 9:09 PM, Hanlie Pretorius <
> > hanlie.pretorius at gmail.com> wrote:
> >
> >> 1. Load your Ecape shapefile and use the Vector - Research tools -
> >> Polygon from layer extent menu to find the extents of the Ecape.
> >>
> >> 2. Reproject the extent polygon into Google projection (EPSG:3857).
> >>
> >> 3. Look at the metadata in the properties of the reprojected extent
> >> polygon layer to find the min and max X and Y values.
> >>
> >> Cheers
> >> Hanlie
> >>
> >> > Date: Thu, 10 Oct 2013 18:18:56 +0200
> >> > From: Solly Vuso <sollyvuso at gmail.com>
> >> > To: Africa local chapter discussions <africa at lists.osgeo.org>
> >> > Subject: Re: [OSGeo Africa] converting shapefile to get Google extent
> >> >       co-ordinates
> >> > Hi
> >> >
> >> > Can someone assist me I have a provincial shapefile that I want to use
> >> > it
> >> > for pmapper and geomoose bt am struggling to get the exact extent for
> >> > my
> >> > province .
> >> >
> >> > Please assist me to get the right google projections
> >> >
> >> > Am in Eastern Cape , South Africa and I need the provincial boundary
> >> extent
> >> > in Google projections
> >> >
> >>
> >
> >
> >
> > --
> > Best Regards
> >
> > Solly Vuso
> > Cell:073 3068 170
> > Fax:086 555 1270
> >
> > I may not know what tomorrow holds for me but I do know who holds ma
> > tomorrow.....
> >
>
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