Questions tagged [stream]

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How to map a stream that flows through a paddy field without a proper channel

I'm mapping a stream in Kerala (India) and found out that a stream flows onto a paddy field and flows through it. At the end of the field it again becomes a proper stream. How can I map it in the ...
Asj's user avatar
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1 vote
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53 views

Measuring distance from coast along stream network

I have a stream network I am using to make a suitability model for a species. One of the factors I want to consider is distance from a given point to the coast, so I'm hoping to find a way to create a ...
Young's user avatar
  • 11
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56 views

Drainage line do not match DEM stream line using Arc Hydro

I've been running my DEM using Arc Hydro, drainage line output do not match the DEM or the basemap stream. What could be the problem? The red line is my stream from delineated DEM, the blue line is ...
Michelle Tannagan's user avatar
3 votes
0 answers
39 views

LiDAR derived streams - map scale

Historically, streams were defined by the map scale. For example, for a map with a scale of 1:24,000 would mean that the streams identified on that map would be 1:24,000 streams. With streams that are ...
user15564926's user avatar
5 votes
1 answer
295 views

Stream Flow Arrow

I'm willing to know how to do these kind of arrows in QGIS. I'm trying to estimate "urban rivers" through urban areas and these tool seems to work for the purpose. What tool can do these? ...
Daniel Pi-Suñer's user avatar
2 votes
0 answers
92 views

Bringing river bed to the same height as surrounding ground in QGIS

I have a DEM containing the current flow networks in an area. I also have a shapefile showing the same flow network. I would like to derive a new river network to see how water would flow if the ...
Sofia's user avatar
  • 21
1 vote
1 answer
200 views

Calculate aspect for stream segments in R from 2D linestring and DEM

I would like to calculate the general aspect for stream segments in R. The stream network has been derived from the DEM and is in 2D. I have split the stream segments into equal parts of 100m (or less)...
user3386170's user avatar
  • 1,937
6 votes
2 answers
251 views

Removing additional lines from vectorized stream network

I have a large raster stream network (excerpt below) in QGIS that has been thinned using r.thin (light blue squares) and then vectorised using r.to.vect (pink lines). However, because some of the ...
Tom Brennan's user avatar
  • 4,612
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0 answers
139 views

r.watershed stream/rivers pixel size

I am using r.watershed to get a stream map (which I assume is rivers). However the output rivers is always 1 pixel wide. I would've assumed that if I run this on say Iraq I would see the Tigris and ...
KaiserJohaan's user avatar
1 vote
1 answer
903 views

Flow accumulation from r.watershed creates discontinuous stream network

I am interested in using r.watershed as integrated in QGIS for a course I teach, but am noticing discrepancies in the flow accumulation (facc) rasters and resulting stream networks that I get from ...
Trent Biggs's user avatar
1 vote
1 answer
82 views

How would I process and output every possible route of a stream network?

Starting with a stream network, I would like an output that includes every possible route from the lowest level stream to the highest level river as separate lines. Is this possible? I am using QGIS. ...
sreiny's user avatar
  • 21
1 vote
1 answer
349 views

Trace upstream/downstream for multiple pairs of points in ArcMap

I have two point layers, one is set of origin points and one is a set of destination points, each with 608 points. Object IDs match the origins to the destinations. The points are all snapped to the ...
lgs2131's user avatar
  • 11
3 votes
1 answer
690 views

QGIS: Burning stream network (catchment area)

I need help from stackexchange because of a DEM correction problem... I have a DEM with a 5 meters resolution where one of the main river is cut by a large highway. In order to delete that topology ...
Linda's user avatar
  • 341
3 votes
0 answers
279 views

Continuous colour gradient within line segments in vector layer

I am new to QGIS (using version 3.13) and my main objective with it is creating a line vector (multiple points, representing a river) in which the colour of the line changes based on a Continuous ...
Joeri K.'s user avatar
4 votes
1 answer
1k views

Faster, more efficient way to extract stream network from DEM

I am using QGIS and use r.stream.extract to extract the stream lines from a single DEM tile. However, this takes long (about 15 minutes) to complete, especially for a rugged terrain. I plan to extract ...
JAT86's user avatar
  • 922
1 vote
0 answers
130 views

Fixing Discontinuous Stream Networks using ArcMap

I am currently working on a project in ArcMap 10.6.1 involving urban sewershed delineation, however, I am stuck with a discontinuous stream network. I took a LiDAR DEM from NOAA and subjected it to ...
Josh Steiner's user avatar
1 vote
1 answer
3k views

Setting up WMS in ArcGIS Online?

I am looking for a method to export data (Feature Layers) from my Company's ArcGIS Online account. I see that there is a option to export data in various formats in the Gallery section, but we want ...
theMoreYouNgo's user avatar
0 votes
1 answer
180 views

Converting stream definition threshold to extract drainage network to metric scale?

I extracted two drainage networks from a DEM of 30 meters resolution with two stream definition thresholds: 1000 pixels and 500 pixels. Can you tell me what this thresholds represent in terms of ...
Bouram's user avatar
  • 165
0 votes
0 answers
424 views

Preserving Geometry of Shape file after merging edges using Networkx

I have a stream network and I want it to convert in a graph like data structure having vertices with only degree 1 and 3. The degree of the vertex is the number of edges incident to that vertex. The ...
Swapnil 's user avatar
0 votes
0 answers
52 views

Split line layer by another line layer

I have two line layers . One is the stream network (dissolved) and other is the point layer converted to line layer by converting each point into short line segments. I am using "Split by lines" tool ...
Swapnil 's user avatar
3 votes
2 answers
374 views

Creating contours based on polyline using ArcMap?

I would like to create a simple floodplain map. I have LiDAR data with 1 meter accuracy. I have clipped it to a small area of interest that my computer can handle processing the LiDAR. I want to ...
sparky's user avatar
  • 450
0 votes
0 answers
159 views

Merging Degree Two nodes in Stream Network using QGIS 3.4

I have a stream network and I want to convert it in graph like data structure, for which I need to have precise set of FROM and TO vertices.The geometry of stream network is not correct i.e. the ...
Swapnil 's user avatar
2 votes
0 answers
110 views

Finding Intersection Points in Stream Network using QGIS?

I have a stream network and I want to find the red points as shown below. I have tried using Q-chainage and Line Intersection feature in QGIS but it gives more than expected number of points. The red ...
Swapnil 's user avatar
0 votes
1 answer
216 views

Continuous buffer from individual polygons in QGIS

I have a stream segment for which I am trying to find a buffer around with criteria as 5m of elevation. So for each straight line within a stream segment, I have found buffer (polygon) for it. Now I ...
Swapnil 's user avatar
0 votes
1 answer
275 views

Estimate total stream length, frequency and order in ArcMap [closed]

I am new to GIS, and I want to calculate the stream frequency and Strahler stream order in a watershed. I have already processed the DEM and there are 20 sub basins. A sample map what I want to get is ...
khan's user avatar
  • 1
0 votes
0 answers
274 views

Howerive vector stream network from a DEM using D-Infinity Flow Direction algorithm?

I have been working with a 1m LiDAR derived DEM to create a vector stream network. Using the D8 flow direction, D8 flow accumulation, and a specified threshold, I was able to create a vector stream ...
sbhadra's user avatar
  • 143
2 votes
1 answer
298 views

Find higher elevation (10m) perpendicular point from stream network at regular interval

I have a stream network and for that network, I want to find the points at regular intervals which lie at 10m distance perpendicular from the stream.The final goal is to find the buffer of that 10m ...
Swapnil 's user avatar
2 votes
1 answer
306 views

Reading RINEX formatted streams

I'm playing around with a public NTRIP caster but I'm very new to all this. I'm using BKG Ntrip Client to read the stream and the file I get has around 45 lines for each sample. Each line begins with ...
John M.'s user avatar
  • 213
5 votes
1 answer
1k views

QGIS: Edit elevation in DTM to get correct slope of a river

I am new to QGIS and just need it to do a hydrolocic analysis of an area of which I later make a flow model with HEC-RAS 2D. I made it according to this tutorial: https://www.youtube.com/watch?v=Ro-...
Schneefux's user avatar
2 votes
0 answers
49 views

Determining if Runoff Sinks drain to stream or drain to road?

I've tried using the linked method to determine area that drains to stream vs drains to road. For some reason when I run the watershed tool on the the raster representing stream and road features, I ...
SamericaPA's user avatar
2 votes
1 answer
257 views

WMTS Grid Streaming using QGIS?

I've got a WMTS service that work well, but I would like to display a grid in qgis over it with X, Y, Z information how may I do that ? If QGis can't generate it for us, how may I generate this kind ...
Djabx's user avatar
  • 285
1 vote
0 answers
536 views

Can I stream GeoJSON data in openlayers, using Angular6+

I am using angular 6 and openlayers 5. Angular 6 combined with RxJS can easily create streams. I was thinking to use RxJS streams in order to feed GeoJSON data to ol5 vector layers. Why? Because ...
slevin's user avatar
  • 1,129