Questions tagged [watershed]

Use this tag when asking a question about a watershed related to GIS environment.

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How to export selected pour points from a watershed raster into a point vector file in ArcGIS Desktop 10.1 [closed]

After having produced a watershed and executed a snap pour point on its output how can I export selected pour points values into a point vector file.
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72 views

Error while doing Watershed analysis using Python

I am trying to do watershed analysis using Python in jupyter notebook. Whenever I am passing commands regarding watershed delineation in Python I am getting output as raster matrix and when I am ...
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32 views

Finding a pour point in a polygon?

I have a polygon shapefile (created by someone else) that is a bunch of little watersheds. Unfortunately, it doesn't include any coordinates in the attribute table for the lat/long of the pour point ...
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45 views

Determining if species point data is upstream or downstream of artificial fish passes using ArcGIS Pro

I am working with ArcGIS Pro. I am working on a project to determine how to prioritize restoration of artificial fish passes. I have been supplied with species point data, point data of the artificial ...
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13 views

Void fill is subsuming separate lakes into one

I would like to find the watersheds of several lakes that are very close. When I use fill, a couple of the lakes fill into one. Its important that these are separate watersheds. Many soil and snail ...
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1answer
46 views

GRASS GIS change raster output size?

I have a large inut raster geotiff map of size 12000x9000. I am running r.watershed to output a stream raster map. However it is much lower resolution, only about 960x711. How do I make GRASS GIS / r....
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2answers
103 views

Why no need for “fill-sinks” when using r.watershed in GRASS QGIS?

I've seen a few places that when using the r.watershed function in GRASS QGIS, you do not need to use the "fill-sinks" procedure on the DEM before running the function. According to the ...
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23 views

Delineate watershed area for detention ponds

My study area has a series of small detention 'ponds' in the corner of fields. These are designed to capture runoff from the upslope contributing area (not from a discrete channel) during rainfall ...
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34 views

TauDEM: Missing cell area contribution

I have a terrain, that looks like the below: The geotiff file can be found here I run the geotiff file with the taudem, with the threshold value =10 1. PitRemove.exe Site6.tif 2. D8FlowDir.exe -p ...
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33 views

How to train or calibrate stream flow accumulation using observation data?

I need to calculate flowrate at designated coordinates (Point of interest - POI) in a watershed. I have real-world data from stream gauge stations along this watershed for each 50-150 km2 rainfall ...
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234 views

Watershed delineation using hydrological Python library

We would like to delineate watershed polygon for a given pour point using hydrological Python library. Until now, we have tried these libraries: pyshed Grass (r.watershed) Whitetoolbox We have ...
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12 views

How to improve “reach” in Watershed Segmentation?

How to improve "reach" in Watershed Segmentation? That is, I have a CHM (canopy height model) or similar image with objects that I want to cluster. Depending on contrast (?), the watershed ...
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9 views

How can I improve (Marker-Based) Water Segmentation results?

How can I improve (Marker-Based) Water Segmentation results? I've tried the ordinary Watershed first, then Marker-Based in ImageJ. While the Marker-Based seems like it could perform better, the ...
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1answer
23 views

How can I export a Seed Points layer as a image?

I have the Seed Points layer produced by Watershed Segmentation. I want to export is as a image (with background). How can I do this? I understand that I can do Project->Export->Export Map to Image. ...
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1answer
41 views

Is it possible to create specific-sized watershed in a GIS environment? [closed]

I used the GRASS gis module to design catchment area with a minimum size of 2 kmsq. However, I would like to know if, in addition to the minimum size, I can limit a maximum size of 5 kmsq for them. In ...
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2answers
442 views

Why does running the SAGA Upslope Area tool in QGIS result in a 0 (zero) to 0 (zero) histogram and an all black layer?

I am using QGIS in order to delineate a watershed, and am using 1/3 arcsecond DEMs. I have created a Filled DEM using the SAGA Fill Sinks xxl (Wang & Liu) tool. Next I ran the SAGA Channels and ...
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0answers
19 views

Stream Segmentation resulting in a grid of squares

I have been trying to run the Arc Hydro Stream Segmentation tool for the purposes of delineating catchment areas and watersheds for a wetland analysis in ArcMap 10.7. I have thoroughly read the Arc ...
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0answers
38 views

Watershed Delineation for Specified Streams

I have a set of streams (currently a shapefile (line)) which I need to delineate the watersheds for. I have attempted to use various QGIS tools, however, each tool I have tried is for delineation of ...
2
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1answer
258 views

Individual tree segmentation using R-package lidR [closed]

I have some questions about individual tree segmentation in lidR. I'm looking at using the function lastrees with algorithm watershed. My first question is how to apply it for large areas. How big ...
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18 views

Scale national economic data down to a watershed

Economic Input Output databases such as e.g. the World Input-Output Database by the European Commission contain economic (and often environmental) statistics. The spatial resolution of data provided ...
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273 views

Accessing watershed boundary for lakes in R

I have had success accessing unique database IDs and polygons for various lakes in the US. I'm now looking to get polygons for the watersheds associated with these lakes, but have stumbled a bit. ...
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1answer
66 views

Delineating small scale / subwatersheds using ArcGIS Desktop

I have a number of data points showing the placement of stream gauges. What I'd like to do is to delineate the subwatershed for each point, so that when rainfall events occur, I can see the drainage ...
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101 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 ...
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0answers
18 views

Variations in the number of Sub-Watersheds delineated by various tools [closed]

I have demarcated sub-watersheds using different tools like ArcHydro, ArcSWAT, and Hydrology tool (ArcGIS). The same input data have been used in all tools. There are 35 watersheds derived using ...
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1answer
35 views

basin layer from r.water.outlet Tool has values but is not rendering anything

I'm trying to deliniate a watershed with QGIS and used this tutorial to do so https://geogeek.xyz/catchment-delineation-with-qgis.html 1) r.fill.dir to create depressionless DGM 2) use r.watershed ...
7
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1answer
274 views

Rockfall analysis (Nearest neighbor downhill) in QGIS

I am working on a rockfall guide for QGIS and I'm currently stuck on one of the stages. I currently at a point in the guide where I have two point layers one "rockfall release point"-layer and "...
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1answer
34 views

Seeking quarternary watershed map of Eastern Ontario?

I am looking for a quarternary watershed map of Eastern Ontario. Where is the best place to look for this? I am currently using the ArcGIS Online basemap software to create my maps. I have a CSV ...
3
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0answers
55 views

What is the complexity (big / little o) of the ArcGIS watershed delineation algorithm? [closed]

I'm curious about the complexity, in terms of Big or little O notation, of watershed delineation algorithms that are implemented in ArcGIS. I imagine that these will be dependent on either the size ...
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1answer
180 views

Calculating distance between points following flow direction on ArcMap?

I delineated flow directions in a watershed on ArcMap (10m DEM). Then I want to calculate distance between two points 'following' the flow direction in each raster cell, not a straight line distance. ...
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34 views

What does the values of Watershed Accumulation, Basin, In QGIS indicates?

While performing watershed module in QGIS each output gives some value range while changing color palette. what does it actually means in accumulation , basin, stream flow. What does the value ...
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55 views

Watershed delineation by using QGIS with ifsar dtm 5m resolution of grid

I had some problems during running the channel and drainage basin with an IFSAR DTM, 5m resolution. I followed these steps, according to the guidance from website of QGIS: I reprojected the DTM to ...
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1answer
64 views

Using GageWatershed Function in TauDEM?

I have a D8 flow direction raster made from with TauDEM's D8FlowDir method and a point vector with an attribute 'id' for each. For some reason when I use these two as input in the GageWatershed ...
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0answers
1k views

Watersheds and Catchment delineation in Earth Engine only with included datasets

Is there a possibility to derive Watershed boundaries or catchment areas by using one or more of the integrated data sets in google earth engine? The available data sets are: WWF HydroSHEDS ...
2
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0answers
78 views

Why difference in delineation of watershed by two online watershed modeling tools?

I am using two online watershed delineation tools- eRAMs and Model My Watershed (MMW)- to auto delineate watersheds using water quality monitoring sondes as my outlet points. I have three pieces of ...
3
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1answer
99 views

Watershed a catalog RasterStack in place of RasterLayer in lidR?

I want to use watershed with lidR package on a catalog. I paste this command: rep <- "/home/lasfiles" new_ctg <- catalog(rep) lidR:::catalog_laxindex(new_ctg) opt_output_files(new_ctg) <- ...
3
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1answer
240 views

Tolerance setting in watershed segmentation(EBimage/lidR) in R

Can anyone here explain to me what the "tol" parameter in the watershed algorithm implemented in the BioConductor package EBImage (and lidR) does? I find the explanation in the EBImage help difficult ...
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0answers
45 views

Using minus in water drainage model

I'm doing a lab and I'm trying to understand exactly why I'm using the tool "minus". I have a raster which I'm calling "heights". I also have two rasters with water surfaces and watercourse. I have ...
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0answers
81 views

Using tool “minus” in height model?

I'm doing a lab and I'm trying to understand exactly why I'm using the tool "minus". I have a raster which I'm calling "heights". I also have two rasters with water surfaces and watercourse. I have ...
1
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1answer
755 views

DEM File “not found” Error when running r.watershed with Processing Toolbox in QGIS 3.4.2 with GRASS

I have downloaded a DEM from the NASA server with "SRTM Downloader". I want to find the watershed area, so I run the "r.watershed" function form the Processing Toolbox. However, I got a multi- "...
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0answers
44 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 ...
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1answer
113 views

how can interior basins be modified in the r.watershed GRASS function?

This is a follow up question to How does "Minimum Size of Exterior Watershed Basin" work in r.watershed command in qgis 2.18.12? I understood that the threshold parameter is used to ...
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1answer
347 views

Creating catchments/basins around stream feature class using ArcGIS Desktop?

I have a reasonably accurate steam network for a watershed. This network includes the main channel, major forks, and tributaries. Each channel, fork, and tributary are individual records with single ...
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1answer
1k views

Watersheds in SAGA Fill Sinks Wang & Liu tool

I'm delineating some coastal subbasins using open source software. I have asked a similar question before (Delineating coastal subbasins using SAGA GIS or GRASS in QGIS?). I found that using SAGA Fill ...
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1answer
283 views

Large Scale Watershed Delineation

Using QGIS,I attempted Africa's watershed delineation taking the following steps: Downloaded DEM from earthexplorer USGS (GTOPO30) Created a mosaic of the downloaded DEM Reprojected the mosaic ...
2
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1answer
1k views

DEM reconditioning?

I'm using ArcGIS Desktop 10.5 Arc Hydro Toolbox & encountered a problem while trying to delineate watersheds respectively drainage lines. The red lines indicate my obtained drainage lines, which ...
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1answer
972 views

Google Earth Engine, how to distinguish between rivers/streams and ponds/lakes in a water mask

I am trying to pull out every lake and pond in a region of SW Alaska. I have successfully identified all water features using the following code: // study area var rect = ee.Geometry.Rectangle([-168, ...
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0answers
66 views

Getting higher stream number for lower order stream in ArcGIS Desktop?

The fourth order stream is showing greater stream number then third order stream?
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1answer
782 views

How to create “AGREE Stream” for DEM Reconditioning in Arc Hydro tool?

I want to deliniate streams and watershed using SRTM DEM. for this I am using Arc Hydro tool. While performing DEM Reconditioning for DEM manipulation it asks AGREE Stream as a input. How to create ...
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0answers
73 views

How to create an inlet drainage basin layer

Using a point layer of 8,375 inlets and a DEM, how do I create an inlet drainage basin layer with contiguous basins, each delineating water drainage for and into each inlet? I used an integer DEM, ...
2
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2answers
355 views

How to create “roof line” for a general polygon area?

I have a polygon with an arbitrary shape ( assume that it is well-formed with no self intersection, no duplicated points etc), and I need to subdivide the polygon into sub-polygons like how one would ...