[GRASS-dev] r.watershed at poles

[Sören Gebbert]

Hi Andy,
running r.watershed for the whole globe is IMHO not necessary. Just
run r.watershed for each continent (except Europe/Asia) and isles
(greenland, UK, ...). Everything that is parted by an ocean or a
channel can be processed independently.

Best regards
Soeren

2015-10-02 0:27 GMT+02:00 Andy Wickert <andrewwickert at gmail.com>:
> On Thu, Oct 1, 2015 at 3:52 PM, Markus Neteler <neteler at osgeo.org> wrote:
>>
>> On Thu, Oct 1, 2015 at 7:10 AM, Andy Wickert <andrewwickert at gmail.com>
>> wrote:
>> > Dear GRASS developers,
>> >
>> > Would you know of an easy way to make r.watershed work in
>> > latitude/longitude
>> > over the pole of a planet (in my case, over Antarctica) by specifying
>> > that
>> > the polar boundary in lat/lon is not a sink?
>>
>> Wouldn't be a stereographic projection more appropriate?
>>
>>
>> https://grass.osgeo.org/uploads/images/Gallery/raster/polar_stereographic.png
>>
>> Best
>> Markus
>
>
> Thanks for the suggestion. However, my goal is to run r.watershed across the
> whole globe, so a stereographic projection would an ad-hoc solution.
>
> (I have also had problems in the past projecting between polar stereographic
> and lat/lon, but this is a secondary issue.)
>
> Andy
>
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