Hi Hugh,
I did some work recently on the Tanzania 2012 Census District file from
downloaded from the NBS website plus the census data.
I converted the Arc60 lat/long file to a projected WGS 84 UTM zone 36S
file in QGIS, calculated the Geometry in sqkms then exported the file to
WGS84 lat/long. This seemed to work fine as I was then able to
calculate the population density.
Any problems I can send it offline.
Mike
************************************
Mike Shand,
FRSGS; MAppSci; FBCartS,
Honorary Research Fellow
(GIS Cartography)
Geographical & Earth Sciences,
University of Glasgow,
Scotland, U.K.
Tel: +44 (0)141 330 4780
E-mail: mike.sh...@glasgow.ac.uk <mailto:mike.sh...@glasgow.ac.uk>
Hon. Secretary: Society of Cartographers http://www.soc.org.uk/
HOME PAGE & TANZANIA Links:
http://www.gla.ac.uk/schools/ges/staff/mikeshand/
<http://web2.ges.gla.ac.uk/%7Emshand>
************************************
The University of Glasgow, charity number SC004401
On 13/09/2013 17:13, Wenban-Smith wrote:
My QGIS project uses a .shp file of 179 districts in Tanzania. I wish
to know the area of each district in sq km but the Geometry-$area
function (in the field calculator of the Attributes table) only
reports areas in decimal degrees (whereas the individual area
measuring tool from the toolbar reports sq km but is tedious to use
and not precise). It appears looking under Settings/Project Properties
[General tab] that it is possible to convert to meters only when CRS
transformation is disabled but there is no guidance how to do this
(nor why this should be necessary). I have tried converting the CRS
from Arc 1960 to one the UTM ones but this did not help.
Grateful for any advice more experienced users can offer.
Hugh W-S
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