<div dir="ltr">AFAIK, It also is needed to turn off "on the fly SRC transformation" to get correct area values.... Or QGIS has fixed this point?<br><br>If you can't get correct area values, check out about it....<br><div><div><div><div><div><br></div></div></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">2016-10-12 7:40 GMT-05:00 DelazJ <span dir="ltr"><<a href="mailto:delazj@gmail.com" target="_blank">delazj@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div>Hi,<br></div>To complete Nicolas answer, you should check what are the measurements options set in Project --> Project Properties --> General tab.<br></div>See also <a href="http://docs.qgis.org/2.14/en/docs/user_manual/introduction/general_tools.html#measuring" target="_blank">http://docs.qgis.org/2.14/en/<wbr>docs/user_manual/introduction/<wbr>general_tools.html#measuring</a><br></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">2016-10-12 14:07 GMT+02:00 Nicolas Cadieux <span dir="ltr"><<a href="mailto:nicolas.cadieux@archeotec.ca" target="_blank">nicolas.cadieux@archeotec.ca</a>></span><wbr>:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div></div><div>Hi,</div><div>You may be calculating square degrees and not metres. It can depend on the crs depending on the tools you are using.</div><div>Nicolas</div><div><br>Le 11 oct. 2016 à 08:54, Martina Schäfer [via <a href="http://OSGeo.org" rel="nofollow" link="external" target="_blank">OSGeo.org</a>] <<a href="http:///user/SendEmail.jtp?type=node&node=5290417&i=0" rel="nofollow" link="external" target="_blank">[hidden email]</a>> a écrit :<br><br></div><blockquote style="border-left:2px solid #cccccc;padding:0 1em" type="cite"><div>I experienced some confusion with calculation of area using the field calculator in QGIS version 2.16.3. Since I'm using MapInfo Professional as well, I mainly use tab-files that I can open in both programmes, but occasionally I save as shapefile since this used to be the default in QGIS.
<br><br>When comparing files, I coincidently realized that there was a mismatch in calculated area for the shapefile and the tab-file for exactly the same polygons! I used the field calculator in the attribute table in both cases, but for the shapefile the resulting areas were almost doubled in area compared to the tab-file. Any idea why this is happening?
<br><br>I also realized similar differences when calculating area in a file where projection has been converted from SWEREF99TM (a Swedish national projection) to WGS84. There differences occurred in both the tab and shapefile compared to the area calculated for the same tab-file in MapInfo. Again I find this very confusing!
<br><br>I need to rely on the area-calculations thus I really hope someone here can explain to me what is happening!
<br><br>Thanks in advance,
<br>Martina
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