And light was done!
Objective: to get planimetric-UTM-my-zone areas, in square Km, from a
LatLong layer, just at one step: in Fields calculator
area( transform( $geometry,'EPSG:4326', 'EPSG:32717' ))/100
Sorry, I was wrong for years, reprojecting layers; deactivating OTF SRC;
and using
> Under project properties, general tab - change "ellipsoid" to "None
/Planimetric".
Done, but calculated area is still... geodetic area?. I've tried ArcGIS
and, for my GEO layer, It gives me desired area (same as an UTM layer,
calculated with OTF off); so, it's me or QGIS, but I can't do this
...@lists.osgeo.org] On Behalf Of Nyall
Dawson
Sent: 19. oktober 2016 02:59
To: Carlos Cerdán <sig.up...@gmail.com>
Cc: qgis-user <qgis-user@lists.osgeo.org>
Subject: Re: [Qgis-user] inconsistenty when calculating area depending on file
type or projection?
On 19 October 2016 at 02:22, C
On 19 October 2016 at 02:22, Carlos Cerdán wrote:
> It was my fault. I was used to consider plane areas as "correct", forgetting
> ellipsoidal areas. So, QGIS give us freedom to calculate planar or
> ellipsoidal (geodetical) areas, but we must be careful about settings; Is
>
It was my fault. I was used to consider plane areas as "correct",
forgetting ellipsoidal areas. So, QGIS give us freedom to calculate planar
or ellipsoidal (geodetical) areas, but we must be careful about settings;
Is not it?. Sometimes, too much freedom is annoying!
But, How can I calculate UTM
On 16 October 2016 at 05:20, Carlos Cerdán wrote:
> Hi Nyall (and list)
>
> A small projecto with UTM and GEO layers can be downloaded from dropbox:
>
> https://www.dropbox.com/s/c4cfb48r5326vrk/Cajamarca.zip?dl=0
>
> Attribute table has the correct area in AreaKm2 field (and
On 15 October 2016 at 01:49, Andrew wrote:
> Nyall,
>
> in 2.14.6 I get incorrect areas in a layer with CRS 3857 but not with a
> layer CRS 26910(UTM 10N).
>
> With the UTM layer I get different areas with OTR on and off, but the
> difference is small and I assume it is just
Hi Nyall (and list)
A small projecto with UTM and GEO layers can be downloaded from dropbox:
https://www.dropbox.com/s/c4cfb48r5326vrk/Cajamarca.zip?dl=0
Attribute table has the correct area in AreaKm2 field (and in these
unities). "AreaOTFoff" is the area given by field calculator when "On The
...@lists.osgeo.org] On Behalf Of Nyall
Dawson
Sent: 14. oktober 2016 22:16
To: Andrew <amcani...@gmail.com>
Cc: qgis-user <qgis-user@lists.osgeo.org>
Subject: Re: [Qgis-user] inconsistenty when calculating area depending on file
type or projection?
On 15 Oct 2016 1:50 AM, "
On 15 Oct 2016 1:50 AM, "Andrew" wrote:
>
> Nyall,
>
> in 2.14.6 I get incorrect areas in a layer with CRS 3857 but not with a
layer CRS 26910(UTM 10N).
>
> With the UTM layer I get different areas with OTR on and off, but the
difference is small and I assume it is just due
On 15 Oct 2016 12:51 AM, "Carlos Cerdán" wrote:
>
> Hi Nyall
>
> I'm afraid that 2.16 has still this issue. I've loaded an UTM-17 south
layer (my zone) and a Lat-long layer and:
>
> 1. SRC was seted in UTM
>
> 2. In UTM layer, if OTF SRC transformation is active, I get
Nyall,
in 2.14.6 I get incorrect areas in a layer with CRS 3857 but not with a
layer CRS 26910(UTM 10N).
With the UTM layer I get different areas with OTR on and off, but the
difference is small and I assume it is just due to the different ellipsoids.
When calculating area in the field
Hi Nyall
I'm afraid that 2.16 has still this issue. I've loaded an UTM-17 south
layer (my zone) and a Lat-long layer and:
1. SRC was seted in UTM
2. In UTM layer, if OTF SRC transformation is active, I get different area
than if it's deactivated. Correct value is the last one.
3. In Lat-long
On 12 Oct 2016 11:56 PM, "Carlos Cerdán" wrote:
>
> AFAIK, It also is needed to turn off "on the fly SRC transformation" to
get correct area values Or QGIS has fixed this point?
Everything should be fixed in recent versions, and I very (VERY) much want
to know if any
when calculating area depending on file
type or projection?
Hi,
You may be calculating square degrees and not metres. It can depend on the crs
depending on the tools you are using.
Nicolas
Le 11 oct. 2016 à 08:54, Martina Schäfer [via OSGeo.org<http://OSGeo.org>]
<[hidden email]>
AFAIK, It also is needed to turn off "on the fly SRC transformation" to get
correct area values Or QGIS has fixed this point?
If you can't get correct area values, check out about it
2016-10-12 7:40 GMT-05:00 DelazJ :
> Hi,
> To complete Nicolas answer, you should
Hi,
To complete Nicolas answer, you should check what are the measurements
options set in Project --> Project Properties --> General tab.
See also
http://docs.qgis.org/2.14/en/docs/user_manual/introduction/general_tools.html#measuring
2016-10-12 14:07 GMT+02:00 Nicolas Cadieux
Hi,
You may be calculating square degrees and not metres. It can depend on the crs
depending on the tools you are using.
Nicolas
> Le 11 oct. 2016 à 08:54, Martina Schäfer [via OSGeo.org]
> a écrit :
>
> I experienced some confusion with calculation of
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