[GRASS-user] derive points outlet from r.stream.extract
Giuseppe Amatulli
giuseppe.amatulli at gmail.com
Thu Apr 23 11:53:40 PDT 2020
Hi,
I'm trying to extract the outlet location from the
r.stream.extract stream_vector=stream attribute.
In particular the manual for r.stream.extract reports:
"In layer 2, categories are identical to type_code in layer 1 with
additional category 2 = outlet for outlet points."
I want to be able to extract only the points of layer 2 where category = 2.
However when I run
v.db.connect -p map=stream
Vector map <stream> is connected by:
layer <1/stream> table <stream> in database
</tmp/grass7-ga254-12721/tmploc/PERMANENT/sqlite/sqlite.db> through driver
<sqlite> with key <cat>
I can see only layer 1 (which does not contain category 2).
Is there a way to connect to layer 2?
How I can be sure that also layer 2 has been created and is not missing?
Thanks
Giuseppe
GRASS 7.6.0 (tmploc):/gpfs/scratch60/fas/sbsc/ga254/dataproces/MERIT_HYDRO
> v.info map=stream
+----------------------------------------------------------------------------+
| Name: stream
|
| Mapset: PERMANENT
|
| Location: tmploc
|
| Database: /tmp/grass7-ga254-25033
|
| Title:
|
| Map scale: 1:1
|
| Name of creator: ga254
|
| Organization:
|
| Source date: Thu Apr 23 14:42:51 2020
|
| Timestamp (first layer): none
|
|----------------------------------------------------------------------------|
| Map format: native
|
|----------------------------------------------------------------------------|
| Type of map: vector (level: 2)
|
|
|
| Number of points: 250905 Number of centroids: 0
|
| Number of lines: 245570 Number of boundaries: 0
|
| Number of areas: 0 Number of islands: 0
|
|
|
| Map is 3D: No
|
| Number of dblinks: 1
|
|
|
| Projection: Latitude-Longitude
|
|
|
| N: 77:06:40.5N S: 73:10:55.5N
|
| E: 158:07:46.5E W: 135:26:34.5E
|
|
|
| Digitization threshold: 0
|
| Comment:
|
|
|
+----------------------------------------------------------------------------+
--
Giuseppe Amatulli, Ph.D.
Research scientist at
School of Forestry & Environmental Studies
Center for Research Computing
Yale University
New Haven, CT, USA
06511
Teaching: http://spatial-ecology.net
Work: https://environment.yale.edu/profile/giuseppe-amatulli/
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