[Qgis-user] Query re: Area measures

[Mike Shand]

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.Shand at glasgow.ac.uk <mailto:Mike.Shand at 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/ 
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************************************

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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