Geographic Information Systems

Questions tagged [hydrology]

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The study of the movement, distribution, and quality of water on Earth and other planets, including the hydrologic cycle, water resources and environmental watershed sustainability.

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Vector map (rivers) to Raster. [ **ERROR 1: Wrong value for -outsize parameter.**]

I want to transform this vector map: To something like this I only tried to convert the vector map through Raster> Conversion> Rasterize But I get this Error: QGIS version: 3.6.3-Noosa QGIS code ...
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1answer
29 views

Quicker function than dissolve and difference

I'm on QGIS (v. 3.6) trying to create a map of Florida's hydrography using the NHD "Water Areas" shapefile. Methodology is to fix any invalid geometries in the NHD data, dissolve the layer, and then ...
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29 views

Extract longest flow path in ArcGIS pro

I did calculate Hydrology with Spatial Analysis tools==> Hydrology and now, I have streams and Watershed. In each watershed, I need to extract the longest Flow as a polyline for calculate slope. What ...
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41 views

SAGA: could not initialize data objects (QGIS 3.6, Mac 10.14)

I was trying to generate a catchment area from a DEM and got the error message: The following layers were not correctly generated.<ul><li>/var/folders/ft/rbsnpzy96r76t8rkj5fdtzc40000gn/T/...
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19 views

Flow Distance Not Calculating for Entire Raster

I am trying to calculate the height above the nearest stream for an area. The problem is, it only does so for a portion ( the colored area below) of my area of interest. In the pic below, the black ...
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19 views

Creating symbols between connecting lines to represent line boundaries

I am trying to figure out a way to create markers as seen from the attached image where an angled line (in dark red) is created between the lines to represent a connecting stream. With the data I am ...
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13 views

Calculating SCS curve numbers using DSM instead of DTM

Are the curve numbers (calculated by SCS Curve number method) through DSM (Digital Surface Model) valid? Most of the SCS curve number studies focus on calculating curve numbers through a DTM (Digital ...
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22 views

Measuring relative discharge in QGIS?

I have marked several points on a stream (distant 500m) and then calculated each point elevation using a DEM data. On a stream there are two gauge station to measure the flow rate (discharge value). ...
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1answer
94 views

Finding glider reachable area / catchment area with custom slope?

I'd like to produce maps for gliders in mountains. I'm looking to display the reachable area by a glider taking off from a given point (obviously with the corresponding DEM). For a first approach I'...
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16 views

Install SWAT hydrological model on Ubuntu [duplicate]

I am trying to go back using Ubuntu in my work as hydrologist. Is there any way to install the SWAT model, and in particular QSWAT on Ubuntu?
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37 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 ...
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1answer
18 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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1answer
32 views

How can I find the elevation a set distance upstream and downstream from a layer of crossing locations

I have a channel network which I've intersected with a proposed road network to produce crossing locations. I need to find the channel slope averaged over a 20m stream length. I also have a raster ...
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1answer
34 views

Watershed layers that drain to ocean?

I have been searching for a watershed layer for California or for the entire US that encompasses all upstream area from ocean outlets (e.g. the entire catchment draining into each ocean output). I ...
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28 views

Is there a way to produce a line on a raster, which direction is based on cell values?

I am looking at a raster layer where each cell has one of 8 values, indicating where flow from the cell is directed. Is there a way to select any given cell, and have a line drawn which will follow ...
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36 views

Whitebox GAT branch depression big raster

I'm trying to run the tool Brunch depression form Whitebox GAT but the process doesn't work probably because the DEM is oversize For generate that raster i converted the single quadrant in the ...
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35 views

Channel network from high resolution DEM for flat areas

I'm working on channel network extraction from a LiDAR DEM (square grid max resolution 0,25 cm), and my area of study is vary flat with some part below the sea level. I applied the classical valley ...
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2answers
225 views

Fill sinks until a known value

I have a DEM and I want to fill every sink with a Value of 2 meter. If a sink is less than 2 meter, it is filled full and if it is bigger, it is filled until it reach 2 meter. The problem is that ...
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1answer
29 views

GRASS Error: WARNING: segment zero_fill(): Unable to write (No space left on device)

I was trying to define the drainage patterns and to delineate some catchments based on a 30m DEM using r.watershed --overwrite elev=DEM accumulation=Accum drainage=Drainage -m but grass would ...
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1answer
57 views

Shifting entire river channel in HEC-RAS?

This question is specific to the HEC-RAS software. I'm trying to use the software to shift a river channel. I've used the Geometric Data Editor for the Cross Sections to edit the positions of the ...
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1answer
46 views

How can I reduce the size of shapefile (.prj, .shx, .shp) up to 8 MB? [closed]

It is sub basin photo which I want to upload to CHRS so that I can to download satellite precipitation data (https://i.stack.imgur.com/EQt3v.jpg)
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1answer
189 views

Choosing parameters for SAGA Wetness Index?

I've been working with SAGA GIS to calculate the Topographic Wetness Index of an alpine catchment. I am using the tool Terrain analysis > Hydrology > SAGA Wetness Index because, compared to ...
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2answers
128 views

Define catchment boundaries with GIS using R

Using a DEM, I want to define catchment boundaries for a given location on a river. Basically, what area drains into this point. In ArcMap, I can do that with flowacc and other tools; but I'd like to ...
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28 views

Split single polyline network at a point feature to make unique fields with unique distances

I am working with a large river network polyline shapefile. I am trying to calculate a dendritic connectivity index using a point shapefile representing locations. The river network shapefile has a ...
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1answer
45 views

arcpy fails to get spatial reference in hydro script

I have an ArcPy script that extracts a stream network from any chunk of terrain. It takes the terrain and if it's in a GCS, it projects it to the correct UTM zone prior to further processing. Though ...
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1answer
101 views

Selecting or highlighting upstream elements

I would like to use the information from the Swedish SMHI related with their hydrological model elements (catchment areas) that have a Containment hierarchy structure, each element has the information ...
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1answer
177 views

tauDEM flow accumulation (D8 or D-infinity) results is NA-values for some major rivers

I am having some trouble with tauDEM that I am hoping someone can give me some advice on. I'm running tauDEM via command line through R-studio. I am working with some 30m resolution SRTM DEM data in ...
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1answer
394 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
63 views

How to Create SCS (now NRCS) Curve Number Grid using GIS with European map (ESDAC dataset)?

After finishing the watershed delineation, and after creating the HMS schematic in Arcmap, i was trying to include the land use map and soil map in the process, by using the CNgrid preparation by ...
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1answer
32 views

Choose between two points with same name but different attributes in ArcGIS

I have a dataset of thousands of points, made by the intersection of flowlines with waterbody polygons. Each polygon has two (or sometimes more, if the waterbody has multiple tributaries) points made ...
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1answer
85 views

Find minimum downstream flow distance from each polygon to any polygon in other feature class

The Problem: I have two polygons feature classes, let's call them "SourceAreas" and "DangerAreas". For each SourceArea, I need to know if water could flow to any DangerArea and if so, what is the ...
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430 views

Displaying flow direction using arrow in ArcGIS Desktop?

I created a flow direction raster out of a DEM using ArcGIS Spatial Analyst Tools/ Hydrology, so the directions are coded in raster values as displayed below. [http://desktop.arcgis.com/de/arcmap/10....
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33 views

Automatically locating endpoints (river sources) in a stream network

I have a stream network in ArcGIS 10.2.2 and I would like to know if it is possible to automatically add endpoints based on the stream network. The network is pretty big and doing this manually ...
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1answer
71 views

Assigning land cover type (in shapefile) to hydrologic soil shapefile in QGIS?

I have a land cover and a hydrologic soil group shapefiles which cover my watershed. They have different polygons. For example, a forest type land cover (one polygon in land cover shapefile) may ...
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1answer
66 views

TauDEM Model Availability

I'm trying to find the TauDEM Model Builder Models toolbox. I'm teaching myself how to use TauDEM to delineate watersheds. After running through some examples I started putting the modules together ...
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1answer
175 views

Flow accumulation algorithm open source code in C++ on Windows

I'm looking for flow accumulation open source implementation ( C++ or C# would do, Python no), on Windows, preferably the source code comes with Visual Studio project files so that I can just build ...
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0answers
58 views

Seeking open source alternative to RivEX (add-in for ArcGIS designed to process vector river networks) [closed]

I wish to process a river network - for the assessment of hydrological potential. RivEX is one addin (not free) which could be used with ArcGIS. Is there any alternative to this?
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2answers
53 views

Acquire direction between points along route

How can I generate a directionality attribute between two points along a route/line? Currently I am using Network Analyst to determine closest facilities, but I need a direction (upstream/downstream) ...
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1answer
55 views

Cumulative distance along a raster stream network

I am looking to calculate the cells along a stream network from starting points to a maximum distance and stopping points. I need something like r.cost in GRASS (https://grass.osgeo.org/grass75/...
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2answers
127 views

How can the flow accumulation in a hydrological model/stream network be maintained across tiles of a large area of interest?

My study area is too large to be processed in its entireity by any hydrological modelling software I have found yet. I will have to break it up in to smaller areas, but there will be flow across these ...
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1answer
200 views

Calculating floodplain for river section using DEM only in ArcGIS Desktop?

I'm looking to create areas where water might go when a river floods its banks. I have a pretty good resolution DEM (5ft^2 for each "square"). I'm not looking for anything super accurate or precise ...
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3answers
424 views

Locate wet patches using DEM

I'm searching for a way to determine the location of wet patches, after rainfall, in a DEM. By this, I mean puddles. We are investigating the best locations to locate paths for recreational use. ...
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0answers
547 views

Qswat in newer version of QGIS

How can I setup QSWAT in newer versions of QGIS ? The link here says QSWAT requires QGIS 2.6. I tried installing QSWAT in new versions and it couldnot be done. Is there a way to install QSWAT in new ...
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35 views

SAGA Maximum Flow Length problems with the Coordinate systems

I'm new to SAGA. I've got a srtm data set from europe and want to charge the maximum flow length especially from the river Elbe. The data is in WGS84 So first I ran the tool "Fill Sinks"(Wang & ...
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2answers
109 views

Interpreting GLDAS 2.1 precipitation data

I am trying to use the GLDAS 2.1 3-hourly precipitation datasets available at: The dataset is documented here: https://hydro1.gesdisc.eosdis.nasa.gov/data/GLDAS/README_GLDAS2.pdf The data is ...
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313 views

SAGA functions not writing output raster using QGIS 3? [closed]

I'm using QGIS 3.0, using a SRTM 1 Arc Second to perform hydrological analysis using some of SAGA functions (such as Fill Sinks), if I choose temporary output, it works fine; if I choose to save to ...
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2answers
166 views

Performing Weighted Flow Accumulation in GRASS?

I would like to calculate a weighted flow accumulation raster with GRASS. I have a DEM and a rainfall raster. I am looking to calculate the rainfall accumulated downstream. Basically, it is similar in ...
4
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1answer
133 views

Calculate Polygon Centerline with a LeastCostPath approach

I'm working on deriving the centerline of a polygon, similar to this question or this one, using a different approach. I'm 90% done with the task, but cannot reach the final step. My approach is to ...
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1answer
116 views

Hydrological conditioning using stream vector in GRASS?

I would like to make an hydrological conditioning of a DEM using an available stream network in vector form. I know r.hydrodem but it doesn't allow to use the stream vector. I need something to burn ...
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1answer
37 views

Find all polygons upstream of a set of points? [closed]

Given two datasets 1) polygons for global river basins and 2) points for global hydro power dams; how can I determine the upstream basins for each dam? Not sure where to start with this, looking for ...

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