[GRASS-dev] area measurements

[Maris Nartiss]

Thank you, Anna :)
I just tested - it really works. Also I'm happy to see that event
handling for distance measurement now is in a good shape. Finally both
tools are usable in G7.

Thank you and keep up your good work :)
Maris.

2014/1/7 Anna Petrášová <kratochanna at gmail.com>:
> Hi Vincent,
>
> just FYI, I fixed (and Markus) the problems with units, so you should now be
> able to use 'metres' as well (but in GRASS 7 only).
>
>
> On Sun, Jan 5, 2014 at 4:05 PM, Anna Petrášová <kratochanna at gmail.com>
> wrote:
>>
>> Hi Vincent,
>>
>>
>> On Sun, Jan 5, 2014 at 10:14 AM, Vincent Bain <bain at toraval.fr> wrote:
>>>
>>> Le dimanche 05 janvier 2014 à 08:42 -0500, Anna Petrášová a écrit :
>>> >
>>> > Vincent,
>>> >
>>> > On Sun, Jan 5, 2014 at 5:19 AM, Vincent Bain <bain at toraval.fr> wrote:
>>> >         Hi Anna,
>>> >
>>> >         I just tested on r58611. Unfortunately it fails :
>>> >
>>> >
>>> > could you try m.measure separately? Launch it from gui command line or
>>> > menu so that you have the interactive adding coordinates from map
>>> > display. Could you post the result of m.measure with and without -g
>>> > flag?
>>>
>>> Yes, here it is with four points describing a 1 km side square :
>>>
>>> m.measure
>>> coordinates=922000,2106000,923000,2106000,923000,2107000,922000,2107000
>>> units=meters
>>> Length:  3000.000000 meters
>>> Area:    1000000.000000 square meters
>>>
>>> m.measure -g
>>> coordinates=922000,2106000,923000,2106000,923000,2107000,922000,2107000
>>> units=meters
>>> units=meters,square meters
>>> length=3000.000000
>>> area=1000000.000000
>>>
>> I actually didn't want you to use the units parameter, this is why you got
>> reasonable outputs. Without it you would probably get segmentation fault. I
>> created a ticket for this:
>> http://trac.osgeo.org/grass/ticket/2157
>>
>>> Having a closer look at my PROJ_UNITS file, I noticed unit was set to
>>> "metre" and units was set to "metres". I tried to change these values to
>>> "meter" and "meters". And now it works just fine.
>>
>>
>> Yes, that makes sense. I was wondering why do you have metres instead of
>> meters there?
>>
>>>
>>> I can't say when and how one can tweak this variable.
>>> Do you think this enhancement could be easily backported to 6.4 ?
>>
>>
>> Unfortunately not. One thing is the GUI part which I would have to write
>> again for grass 6 because although it looks the same, the code of wxGUI is
>> quite different. And write it for grass 6 would be more difficult. The other
>> thing is that m.measure is only a grass 7 module so I don't know which
>> backend should be used for grass 6.
>>
>> Regards,
>> Anna
>>
>>>
>>> Yours,
>>> V.
>>>
>>>
>>
>
>
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