[Qgis-developer] [Qgis-user] Calculating acreage in 2.2
rjhale at northrivergeographic.com
Thu Feb 27 11:02:04 PST 2014
I'm not sure exactly what is going on. I just set out another email and
I can't get this one data layer I've created to calculate correctly. I
chalked up the one yesterday to fat fingering the acreage. Today - I've
done this quite a bit it's consistently wrong. Linux - it's right. I'm
going to reboot. Go for a walk. Come back and try again.
I'm going to do a series of tests to reinforce it's me - I've done some
things but I haven't been consistent between platforms.
This cat isn't sneaky but sleeps on my desk....
Randal Hale, GISP
North River Geographic Systems, Inc
423.653.3611 rjhale at northrivergeographic.com
On 02/27/2014 01:49 PM, James Wood wrote:
> Hey Randy,
> I don't know about your bug, but having sat through some of your TNGIC
> presentations, I can verify that you are, in fact, crazy...
> I've got a parcel base that's in EPSG:2274 and when I calc a
> comparable field (decimal; width:20; precision:5) using $area/43560, I
> get a value that is the same as in the calc_acre field for that
> same parcel (values inserted by the assessor), so it looks like it's
> working for me. I'm running v2.2 x64 installed with OSGeo4W on Windows
> 7 SP1.
> FYI, cats can be pretty sneaky...
> > Date: Thu, 27 Feb 2014 12:00:29 -0500
> > From: rjhale at northrivergeographic.com
> > To: qgis-user at lists.osgeo.org; qgis-developer at lists.osgeo.org
> > Subject: [Qgis-user] Calculating acreage in 2.2
> > I think I may have found a bug....or I'm just slightly confused.
> > I'm working on a client job (digitizing forestry stands) and I need to
> > calculate acres of the final area. The data I'm working with is in
> > EPSG:2274. So I create a field that is decimal (width 20, precision 5)
> > and in the field calculator I use $area/43560 - (there are 43560 square
> > feet in an acre). My result is one decimal off - instead of 195.30
> > I have 19.53 Acres. I've done this enough to where I'm questioning
> > button push. If I divide by 4356 I get the correct number. I'm
> > doing this in Windows 7 OSGEO install QGIS 2.2.
> > Anyway - can someone tell me I'm crazy...or not crazy. Projections are
> > set correctly...cat has remained off the keyboard etc.
> > Randy
> > --
> > -----------------
> > Randal Hale, GISP
> > North River Geographic Systems, Inc
> > http://www.northrivergeographic.com
> > 423.653.3611 rjhale at northrivergeographic.com
> > twitter:rjhale
> > http://about.me/rjhale
> > _______________________________________________
> > Qgis-user mailing list
> > Qgis-user at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/qgis-user
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Qgis-developer