Questions tagged [strahler]

Horton–Strahler number

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29 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 ...
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43 views

Classifying a GeoJSON LineString type file based on Strahler Order with Python

I am working on a Python project working with a GeoJSON file (Linestring type). The aim of this project is to classify lines based on Strahler Order (Wikipedia : https://en.wikipedia.org/wiki/...
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2answers
115 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 ...
2
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0answers
37 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 ...
1
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0answers
116 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 ...
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2answers
82 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 ...
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0answers
159 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 ...
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0answers
26 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 ...
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0answers
46 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 ...
2
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0answers
102 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 ...
0
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1answer
534 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....
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0answers
34 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 ...
10
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1answer
519 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?
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1answer
72 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 ...
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0answers
293 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 ...
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0answers
1k 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)...