Harish, As my screen capture shows, I am able to select the Layer or Project or Ellipsoid CRS. I am able to do it on a “Line” “Point” and “Polygon” Shapefile (.shp) file. I’m running QGIS 1.8 Lisboa. Maybe check and make sure that you have the most up-to-date version. Apart from that I’m not sure what else to tell you. Hopefully someone else can help. Jeremy
From: Harish Sent: Sunday, July 08, 2012 12:59 AM To: Jeremy Hill Cc: [email protected] Subject: Re: [Qgis-user] Area Calculation in Field Calculation Thanks! point one is solved but for point two, export/add geometry tool returns the window as attached, there is no option for choosing CRS for area calculation. Regards On Fri, Jul 6, 2012 at 10:14 PM, Jeremy Hill <[email protected]> wrote: ------------------------------ Message: 4 Date: Fri, 6 Jul 2012 15:16:09 +0530 From: Harish <[email protected]> To: [email protected] Subject: [Qgis-user] Area calculation in field calculator Message-ID: <CAKCjEX9Vt_0jvEEiHSMOVGMGRR3wMb-0e6BHiZHmrqnB_4Z_=q...@mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1" 1- I converted projection 4326 to 32643(UTM zone 43N) to get are calculation. I used geometry operator as $area with creating a new field of decimal (real) type with width 10 and 2 precision. I tried with different widths and precisions, every time there are 7-8 digits after decimal, like, 2361773.81506348 2895003.41503906 1384160.6237793 10020411.4874268 ANSWER1----- You need to uncheck the "Toggle Editing" and "save" your layer and then it will be displayed with the proper width and precision that you set it to. 2 Further I read in new functionality list of QGIS1.8 that area/length etc. may be calculated by using project (if in metric units) CRS in QGIS 1.8, without changing original CRS of layer if it is in Geographic coordinates. Is this feature available in 1.8? ANSWER2--- It does give you the option that when you use "Export/Add Geometry Column" that it gives you the option to Calculate using Layer CRS, Project CRS, or Ellipsoid. You can save to a new layer or update the current one which your using. I have not experimented with this in different projections to verify the accurate data or the area/length but the "plugin" does work. Regards OS-Windows7, QGIS 1.8 stand alone
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