120 reputation
9
bio website edild.github.com
location Germany
age
visits member for 3 years, 9 months
seen Mar 30 at 17:15

R enthusiast, ecological statistics, mainly self-taught, still (always...) learning.


Apr
16
awarded  Autobiographer
Mar
30
accepted Find headwater polygons
Feb
19
comment Find headwater polygons
I just selected a few polygons in the north of the data set overview, detail.
Feb
18
awarded  Benefactor
Feb
17
comment Find headwater polygons
I will run the query on a server. I think that only a minor part of the polygons will meet the selection criteria...
Feb
17
comment Find headwater polygons
Great! Thank's for your efforts!
Feb
13
comment Find headwater polygons
@JohnBarça. It's not a part of my actual data set, but very similar and freely available here.
Feb
12
comment Find headwater polygons
Thank you all for your thoughts! I am getting closer (e.g. this is part (1) of @MikkelLydholmRasmussen suggestions).
Feb
11
awarded  Promoter
Feb
11
revised Find headwater polygons
added 218 characters in body
Feb
11
comment Find headwater polygons
@JohnBarça I put sample data on my dropbox. Data is from south-west Germany and approx. 10% of my data set. It's two shape files - one with streams and one with polygons.
Feb
5
comment Find headwater polygons
Sorry for the delay @JohnBarça! I am currently too busy with other things... Will try to provide example data by the end of the week.
Feb
2
comment Find headwater polygons
Yeah, will upload a reproducible data set this evening.
Jan
29
comment Find headwater polygons
It covers Germany and has ~40.000 rows.
Jan
29
awarded  Commentator
Jan
29
comment Find headwater polygons
Thank you John for your help! All the solutions that I came up with are either wrong or take forever. Perhaps I have to think in another direction...
Jan
29
comment Find headwater polygons
No, e.g. in the lower green polygon also two rivers meet. I want to exclude those polygons that have a river passing by (the river enters and leaves the polygon) and keep those with starts (and rivers leave only this polygon).
Jan
29
accepted Find start of river
Jan
29
revised Find headwater polygons
edited title
Jan
29
comment Find headwater polygons
Jupp, just the polygons that contain start points AND are not passed by a river / are only starts of the river. The red polygon above contains startpoints, but is NOT a headwater polygon as the river flows through it / does not start within the polygon...