Moritz Lennert wrote:
> > For anything other than lat-lon locations, G_area_of_cell_at_row()
> > assumes that the area of a cell is constant over the region. That's
> > true for equal-area projections, and not far off for small scales
> > (where projection would be almost an affine
Le 8 décembre 2016 07:25:46 GMT+01:00, Glynn Clements
a écrit :
>
>Moritz Lennert wrote:
>
>> Yes. Do we have any existing module to calculate area by pixel ? An
>> area() function in r.mapcalc would be nice...
>
>I notice that this has been added, but I'm not sure
Moritz Lennert wrote:
> Yes. Do we have any existing module to calculate area by pixel ? An
> area() function in r.mapcalc would be nice...
I notice that this has been added, but I'm not sure that it's adequate
for this task.
For anything other than lat-lon locations, G_area_of_cell_at_row()
On Fri, Dec 2, 2016 at 11:19 AM, Moritz Lennert <
mlenn...@club.worldonline.be> wrote:
>
> On 01/12/16 14:31, Markus Metz wrote:
[...]
>>
>> In theory, a higher target resolution should result in a higher total
>> sum, a lower target resolution in a lower total sum.
>
>
> Why is that if we work in
On 02/12/16 11:53, Paulo van Breugel wrote:
On 02-12-16 11:19, Moritz Lennert wrote:
On 01/12/16 14:31, Markus Metz wrote:
On Thu, Dec 1, 2016 at 1:16 PM, Paulo van Breugel
> wrote:
On 01-12-16 12:01, Moritz Lennert wrote:
On
On 01/12/16 15:13, Markus Metz wrote:
On Thu, Dec 1, 2016 at 12:01 PM, Moritz Lennert
> wrote:
On 30/11/16 09:40, Paulo van Breugel wrote:
On Tue, Nov 29, 2016 at 5:44 PM, Moritz Lennert
> An area() function in
On 02-12-16 11:19, Moritz Lennert wrote:
On 01/12/16 14:31, Markus Metz wrote:
On Thu, Dec 1, 2016 at 1:16 PM, Paulo van Breugel
> wrote:
On 01-12-16 12:01, Moritz Lennert wrote:
On 30/11/16 09:40, Paulo van Breugel wrote:
On
On 01/12/16 14:31, Markus Metz wrote:
On Thu, Dec 1, 2016 at 1:16 PM, Paulo van Breugel
> wrote:
On 01-12-16 12:01, Moritz Lennert wrote:
On 30/11/16 09:40, Paulo van Breugel wrote:
On Tue, Nov 29, 2016 at 5:44 PM, Moritz Lennert
On Thu, Dec 1, 2016 at 12:01 PM, Moritz Lennert <
mlenn...@club.worldonline.be> wrote:
>
> On 30/11/16 09:40, Paulo van Breugel wrote:
>>
>>
>>> On Tue, Nov 29, 2016 at 5:44 PM, Moritz Lennert
>
>
>>>
>>> > An area() function in r.mapcalc would be nice...
[...]
>
>> |r.mapcalc "rcs =
On Thu, Dec 1, 2016 at 2:31 PM, Markus Metz
wrote:
>
>
> On Thu, Dec 1, 2016 at 1:16 PM, Paulo van Breugel
> wrote:
> >
> >
> >
> > On 01-12-16 12:01, Moritz Lennert wrote:
> >>
> >> On 30/11/16 09:40, Paulo van Breugel wrote:
> >>>
> >>>
>
On Thu, Dec 1, 2016 at 1:16 PM, Paulo van Breugel
wrote:
>
>
>
> On 01-12-16 12:01, Moritz Lennert wrote:
>>
>> On 30/11/16 09:40, Paulo van Breugel wrote:
>>>
>>>
On Tue, Nov 29, 2016 at 5:44 PM, Moritz Lennert
>>
>>
> An area() function in r.mapcalc would
On 01-12-16 12:01, Moritz Lennert wrote:
On 30/11/16 09:40, Paulo van Breugel wrote:
On Tue, Nov 29, 2016 at 5:44 PM, Moritz Lennert
> An area() function in r.mapcalc would be nice...
Would indeed be a nice addition, but it isn't too difficult to compute,
using:
|g.region
On 30/11/16 09:40, Paulo van Breugel wrote:
On Tue, Nov 29, 2016 at 5:44 PM, Moritz Lennert
> An area() function in r.mapcalc would be nice...
Would indeed be a nice addition, but it isn't too difficult to compute,
using:
|g.region rast=afripop10@PERMANENT|
|PI=3.1415926536|
|export
On 01/12/16 08:49, Markus Metz wrote:
r.to.vect converts only non-null cells, no mask needed, at least for me
in trunk.
Weird, I waws convinced that I saw otherwise before, but now I can
confirm. Sorry for the noise...
>2. reproject these vector points to the target location
I locally
On Wed, Nov 30, 2016 at 7:35 PM, Moritz Lennert <
mlenn...@club.worldonline.be> wrote:
>
>
>
> Le 29 novembre 2016 22:33:39 GMT+01:00, Markus Metz <
markus.metz.gisw...@gmail.com> a écrit :
> > For
> >reprojection, something like r.in.xyz could work:
>
> I'm currently going through this process
Hei,
What about something like this (example converts from UTM33 to WGS84 and
creates ):
r.stats -gn1 INPUTMAP | cs2cs -E -f "%.6f" +proj=utm +no_defs +zone=33
+a=6378137 +rf=298.257222101 +towgs84=0.000,0.000,0.000 +to_meter=1 +to
+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs | tr '\t' ' '
-Original Message-
From: Moritz Lennert [mailto:mlenn...@club.worldonline.be]
Sent: torsdag 1. desember 2016 00.01
>>
>>BTW, I think several modules would benefit from a -b do not build
>>topology...
>Which other modules are you thinking about?
>Moritz
All modules which produce
Le 30 novembre 2016 21:05:18 GMT+01:00, "Blumentrath, Stefan"
a écrit :
>Hei,
>
>What about something like this (example converts from UTM33 to WGS84
>and creates ):
>r.stats -gn1 INPUTMAP | cs2cs -E -f "%.6f" +proj=utm +no_defs +zone=33
>+a=6378137
Le 29 novembre 2016 22:33:39 GMT+01:00, Markus Metz
a écrit :
> For
>reprojection, something like r.in.xyz could work:
I'm currently going through this process and it raises a series of issues:
>
>1. convert raster cells to vector points with raster cell value
On Wed, Nov 30, 2016 at 2:12 PM, Markus Metz
wrote:
>
>
> On Wed, Nov 30, 2016 at 1:22 PM, Moritz Lennert <
> mlenn...@club.worldonline.be> wrote:
> >
> > On 30/11/16 09:40, Paulo van Breugel wrote:
> >>
> >>
> >>
> >> On 29-11-16 22:33, Markus Metz wrote:
> >>>
>
On Wed, Nov 30, 2016 at 1:22 PM, Moritz Lennert <
mlenn...@club.worldonline.be> wrote:
>
> On 30/11/16 09:40, Paulo van Breugel wrote:
>>
>>
>>
>> On 29-11-16 22:33, Markus Metz wrote:
>>>
>>>
>>>
>>> On Tue, Nov 29, 2016 at 5:44 PM, Moritz Lennert
>>>
On 30/11/16 09:40, Paulo van Breugel wrote:
On 29-11-16 22:33, Markus Metz wrote:
On Tue, Nov 29, 2016 at 5:44 PM, Moritz Lennert
>
wrote:
>
>
>
> Le 29 novembre 2016 15:10:11 GMT+01:00, Markus Metz
On 29-11-16 22:33, Markus Metz wrote:
On Tue, Nov 29, 2016 at 5:44 PM, Moritz Lennert
>
wrote:
>
>
>
> Le 29 novembre 2016 15:10:11 GMT+01:00, Markus Metz
On Tue, Nov 29, 2016 at 5:44 PM, Moritz Lennert <
mlenn...@club.worldonline.be> wrote:
>
>
>
> Le 29 novembre 2016 15:10:11 GMT+01:00, Markus Metz <
markus.metz.gisw...@gmail.com> a écrit :
> >On Mon, Nov 28, 2016 at 5:51 PM, Moritz Lennert <
> >mlenn...@club.worldonline.be> wrote:
> >>
> >> Hi,
>
Le 29 novembre 2016 15:10:11 GMT+01:00, Markus Metz
a écrit :
>On Mon, Nov 28, 2016 at 5:51 PM, Moritz Lennert <
>mlenn...@club.worldonline.be> wrote:
>>
>> Hi,
>>
>> In discussions with students the following problem has arisen, and
>I'm
>not sure how to respond
On Mon, Nov 28, 2016 at 5:51 PM, Moritz Lennert <
mlenn...@club.worldonline.be> wrote:
>
> Hi,
>
> In discussions with students the following problem has arisen, and I'm
not sure how to respond to this:
>
> When reprojecting raster data, one has to chose a method of
interpolation. However, when
Hi,
In discussions with students the following problem has arisen, and I'm
not sure how to respond to this:
When reprojecting raster data, one has to chose a method of
interpolation. However, when the data you have represents absolute
numbers (such as population grids), you do not wish to
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