I'm going to plead insanity. I'm having the most inconsistent
"calculating" day ever. I'm going for a walk and then try this again. In
some instances things are off as described below. In others I get the
correct results. This happened yesterday and today. In others it works
fine. I built a grid and in some cases got the normal square footage -
in others it was off. In all cases I've only used tools within QGIS.
Below is the data. I open it in QGIS, edit, and use the formula $area /
43560. Projection is EPSG:2274 . I can't make this calculate correctly
in my OSGEO install of QGIS 2.2. I do this on Ubuntu 12.04 QGIS 2.2 and
it comes out right.
location is here to the data:
/northrivergeographic.com/documents/eshleman-022714.zip
Sorry if I'm unnecessarily causing you guys distress. I do appreciate
the work you all are doing - 2.2 is an excellent piece of software. Even
if I have to confirm I want to remove data from the view (ha).
randy
-----------------
Randal Hale, GISP
North River Geographic Systems, Inc
http://www.northrivergeographic.com
423.653.3611 [email protected]
twitter:rjhale
http://about.me/rjhale
On 02/27/2014 12:00 PM, Randal Hale wrote:
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 acres I have 19.53 Acres. I've done this enough to where I'm
questioning every button push. If I divide by 4356 I get the correct
number. I'm currently 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
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