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Questions tagged [strahler]

Horton–Strahler number

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QGIS Strahler Order Too Many Stream Channels

I have this DEM file and I'm trying to extract possible rivers/streams from it. However , when I run Strahler Order as tutorials on youtube indicate, the output shows too much lines that aren't really ...
cheesetrap's user avatar
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0 answers
38 views

How to extract channel network from DEM file in QGIS and avoid mixing stream from road [duplicate]

I am a bit new to QGIS world and want to extract catchment area and channels from a high resolution DEM file. I tried Strahler Order method available in my QGIS 3.22.9 but the results are not ...
Link_tester's user avatar
2 votes
1 answer
308 views

What does SAGA's flow connectivity show?

In the 'Channel network and drainage basins' algorithm from SAGA in QGIS, a couple of maps are generated. I can't seem to find any documentation on the different output maps. Am I missing something?
PMouton's user avatar
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1 vote
1 answer
210 views

Stream order data for Canadian streams

I am researching streams and I want to select 1st-3rd order streams in North America. The NHD Plus V2 Flowline Network contains stream order (Strahler) in the packaged data and I was wondering if ...
QuestGIS's user avatar
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Merging river network features which should belong to same tributary of certain stream order in ArcMap without using Dissolve tool

I processed the DEM data through Arc Hydro to get the vector data of the river network. I recently tried to calculate the Horton-Strahler ratios and suitable flow accumulation threshold of it, yet ...
Fuqa Ringcan's user avatar
1 vote
0 answers
623 views

Outputs of "Strahler Order" and "Channel Network and Drainage Basins" different despite same threshold

I ran the Strahler Order and the Channel Network and Drainage Basins tools both with threshold at 8 and using the same filled DEM. The results differ as shown below. Strahler Order raster (only ...
BallpenMan's user avatar
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5 votes
0 answers
116 views

Error message while running Strahler order for river delineation

I wanted to make river network using Strahler order in SAGA with filled DEM as the input, but there is an error message keep appearing: QGIS version: 3.14.0-Pi QGIS code revision: 9f7028fd23 Qt ...
Handriyanti's user avatar
3 votes
2 answers
3k views

Obtain channel/stream network from a DEM in QGIS

This might sound like a basic question, but running SAGA's Strahler order won't do the job for me. The lengths of the streams look way too short and this is quite a mountainous area. The result makes ...
Sep's user avatar
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2 votes
0 answers
117 views

Short streams and tiny basins | QGIS-SAGA

After watching a lot of tutorials and trying all approaches I still somehow manage to get streams that are too short over my DEM, resulting in very small basins. I do it the standard way: Get a DEM ...
Sep's user avatar
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1 vote
0 answers
618 views

How to avoid error in "SAGA Strahler order"-process when running it on a merged terrain model file

I am trying to create a catchment in QGIS 3.8 following this tutorial: https://www.youtube.com/watch?v=2fvy9xtAHc4 However, my terrain model is originally divided into 4 overlapping tif-files. I can ...
Marteens's user avatar
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3 answers
895 views

Strahler stream order

I have a layer of line objects representing stream channels. These have been generated at 50K scale but do not have a Strahler order designation. The tutorials I've seen using the SAGA extension in ...
Craig Westell's user avatar
1 vote
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760 views

Strahler Order Error

I'm using QGIS (Zanzibar) for a project in my university and that includes finding the stream order and some shape parameters. So I tried using the strahler order to calculate the stream orders and ...
Samten Phelgay's user avatar
2 votes
0 answers
50 views

Strahler calculation ignoring large rivers

I have a DEM of a portion of the Yukon. I merged numerous DEM rasters then selected a subset for my AOI. I filled the sinks and then calculated the Strahler, but it seems to be ignoring large streams ...
user166432's user avatar
1 vote
0 answers
97 views

Why am I getting a straight flow path (stream) in obviously varying terrain -QGIS

Does anyone have suggestions on why the streams are sometimes represented as longer straight lines, even though the hillshade and contours generated from the same DTM (filled) clearly indicate that ...
BruceT's user avatar
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2 votes
0 answers
152 views

Visualizing Strahler-Order bigger than a specific value

I try to visualize the Strahler-Order bigger than 8 using raster calculator. I changed the style of the raster by changing the render type to singleband pseudocolor and, in the colors selector, I ...
Mohamad Reza Salehi Sadaghiani's user avatar
0 votes
2 answers
807 views

Calculating Stream Order Classification for NHD High Resolution vector data

So I am trying to calculate stream order using the Strahler method. I have vector data from NHD in high resolution and was wondering if anyone has ideas on how to assign stream order using vector data....
ABaut's user avatar
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1 vote
0 answers
36 views

Applying values to highest terminal segments in channel network using PostgreSQL?

I extracted a channel network from a dem but due to some technical difficulties the layer had some discontinuities. So after filling them, i suddenly realised that the Strahler orders it gave me were ...
Moreau Colin's user avatar
10 votes
1 answer
664 views

what is the stream order coming to next given map

I am following Strahler's method for stream ordering. Is the green colored stream 4th order, according to this method?
rsiddi raju's user avatar
0 votes
1 answer
81 views

uDig Spatial ToolBox NetworkAttributeBuilder - strahler order [closed]

I just upgraded my OsGeo4W, which upgraded uDig, I was hoping that would solve my issue with NetworkAttributeBuilder -stating it created stream order, but hung up of Pfafstratter.. Console output ...
als's user avatar
  • 51
1 vote
0 answers
381 views

Method for identifying upstream segments

I need to add to the attribute table of a stream network layer a column that can identify all upstream segments that contribute to the segment (for each segment). My best idea at the moment is to ...
user1650538's user avatar
3 votes
0 answers
2k views

Stream Order: Strahler vs Shreve

I am writing a research paper on watershed delineation and I am looking for experiences/opinions/authoritative answers on: What guides a hydrologist when it comes to choosing between Strahler's (1952)...
Avishek Dutta's user avatar