[OSGeo Africa] How to convert "New Namibia" projection to EPSG 4326 in QGIS

Tue Feb 6 06:21:05 PST 2018

Zoltan,

This is what I’m doing. Comment in capitals:

From: Africa [mailto:africa-bounces at lists.osgeo.org] On Behalf Of Zoltan
Sent: Monday, 05 February 2018 20:15
To: africa at lists.osgeo.org
Subject: Re: [OSGeo Africa] How to convert "New Namibia" projection to EPSG 4326 in QGIS

Hi Calle,
As you have correctly noted, the .prj file tells QGIS how to interpret th embeded "bunch of numbers" [ie: coordinates] in the shapefile geometry. CORRECT
This means that you cannot simply edit the prj file - you actually have to change the bunch of numbers inside the shapefile to be latlong values that are in the correct place in Namibia. I KNOW
So:

Simply open a "clean" QGIS, and note that the empty viewport is in EPSG:4326 (bottom right corner of QGIS window. 

DONE
Drag and drop your shapefile into the Layers Panel (note the bottom right CRS should change to your Shapefile CRS) 

DONE
right-click your shapefile name in the Layers Panel and choose Save As

DONE

In the pop-up window, check that "Format" is set to ESRI Shapefile, Choose a Filename for your LatLong shapefile and change CRS to EPSG:4326 - and click OK

Format ESRI shapefile OK

New file name

CRS: EPSG 4326, WGS84

Encoding utf-8

Ticked “add saved file to map”

No symbology

Scale: 1:50000

Geometry type Automatic

Extent – layer options Resize NO, SHPT blank

No custom options set

Click OK, and I get

“Export to vector file failed.

Error: creation of layer failed (OGR error:Failed to create file Region2.shp: Permission denied)”

Your saved shapefile will now have been reprojected to GCS on  WGS84.  NOPE
To be pedantic, close this QGIS and open a new QGIS, and drag/drop your saved shapefile into it. N/A

The process above is more or less what I’ve always used before, hundreds of times – but now,for the first time, it only returns this “Permission Denied” message.

Note – this is not a folder permission issue. I can use save as for any derived layer, but not when converting….

Other ideas?

Regards

Calle

HTH,  (no, not the chlorine product)
Zoltan

On 2018-02-05 17:53, Calle Hedberg wrote:

Hi,

I’ve received two shapefiles from Namibia – originally from the National Statistics Agency, I think – which has the following .prj file:

PROJCS["New_Namibian",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],

PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",600000.0],PARAMETER["False_Northing",10000000.0],PARAMETER["Central_Meridian",17.0],PARAMETER["Scale_Factor",1.0],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]

When I open the file in QGIS and hover over the maps, the coordinates shown are clearly projected coordinates.

My problem is that I need the maps in EPSG 4326 (WGS-84, geographical coordinates) format, and I’ve been unable to do the conversion – changing the value under shapefile->Properties make the shapefile disappear.

So I’m doing something wrong – probably something really dumb – but I don’t know WHAT….

Anybody able to give me step-by-step instructions on how to re-project “New Namibian” back to standard EPSG 4326?

Regards
Calle

Cape Town

_______________________________________________
Africa mailing list
Africa at lists.osgeo.org
You can UNSUBSCRIBE at https://lists.osgeo.org/mailman/listinfo/africa

-- 

=============================================
Zoltan Szecsei GPrGISc 0031
Geograph (Pty) Ltd.
GIS and Photogrammetric Services

P.O. Box 7, Muizenberg 7950, South Africa.

Mobile: +27-83-6004028
Fax:    +27-86-6115323     www.geograph.co.za
============================================= 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/africa/attachments/20180206/97f2061a/attachment-0001.html>