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<div class="moz-cite-prefix">Hi Hugh,<br>
<br>
I did some work recently on the Tanzania 2012 Census District file
from downloaded from the NBS website plus the census data.<br>
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.<br>
<br>
Any problems I can send it offline.<br>
<br>
Mike<br>
<div class="moz-text-html" lang="x-western">
<div><font face="Arial" size="2" color="#999999">************************************<br>
Mike Shand,<br>
FRSGS; MAppSci; FBCartS,<br>
Honorary Research Fellow<br>
(GIS Cartography)<br>
Geographical & Earth Sciences,<br>
University of Glasgow,<br>
Scotland, U.K. <br>
Tel: +44 (0)141 330 4780<br>
E-mail: <a href="mailto:Mike.Shand@glasgow.ac.uk">Mike.Shand@glasgow.ac.uk</a></font></div>
<div><font color="#999999"> </font></div>
<div><font face="Arial" size="2"><font color="#999999">Hon.
Secretary: Society of Cartographers <a
href="http://www.soc.org.uk/">http://www.soc.org.uk/</a><br>
HOME PAGE & TANZANIA Links: <a
href="http://web2.ges.gla.ac.uk/%7Emshand">http://www.gla.ac.uk/schools/ges/staff/mikeshand/</a></font><br>
************************************</font></div>
<pre wrap="">The University of Glasgow, charity number SC004401</pre>
<br>
</div>
On 13/09/2013 17:13, Wenban-Smith wrote:<br>
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<blockquote cite="mid:E97946D2F69348EE820936C676C02689@LatitudeD620"
type="cite">
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<div><font face="Arial" size="2">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.</font></div>
<div> </div>
<div><font face="Arial" size="2">Grateful for any advice more
experienced users can offer.</font></div>
<div> </div>
<div><font face="Arial" size="2">Hugh W-S</font></div>
</blockquote>
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