Questions tagged [rivers]

A river is a flowing body of water

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18 views

Adding multiple sources to geometric network using ArcMap

I am using ArcMap. I would like to identify all points that are on a river within 10km downstream of a starting point. I have multiple starting points and would like to do this from each of them. I ...
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ArcGIS Pro interpolation point data along a line (river depth)

I'm analyzing habitat suitability using river depth data. However, my data are pretty basic: point data of the water levels at measuring stations (so literally points, not cross sections). First, I'm ...
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Can anything be inferred if NHD doesn't name a stream but the local municipality does?

Case in point: https://watersgeo.epa.gov/watershedreport/?comid=5781291 It shows up in the NHD as not having a name but I'm pretty sure that the local municipality that that creek is in (City of ...
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47 views

Working with the FlowDir in the national hydography dataset

In the National Hydrography Dataset there's a FlowDir field. According to https://www.townofnewipswich.org/sites/g/files/vyhlif4766/f/uploads/dataset_dictionary.pdf the two possible values for FlowDir ...
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96 views

Calculating distance between points within river network using ArcGIS Pro

I have a shapefile of a river, and the coordinates of several points. I am interested in calculating the pairwise distance between each of those points along the river network. Is there any way to do ...
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32 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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1answer
48 views

Rendering raster with fine structure at low resolution in QGIS

I have a raster showing a map with a lot of fine-scale structure (water depths and rivers) in QGIS, and I'd like to make the structure visible when the plot is low resolution. Up close, I have ...
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64 views

An application for measuring river length?

I'm aware of the coastline paradox and its application to rivers in that the measured length of a river depends on the resolution of the measurement. Is there an application that calculates the centre ...
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1answer
59 views

Detecting automatically where rivers flow, directly into the sea or into another river

I am using this dataset of rivers in France. I'd like to automatically distinguish between rivers flowing directly into the sea versus rivers that flow into another river and draw a map of only those ...
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1answer
52 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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2answers
59 views

Buffering river but it came out as circle

I'm buffering a river using QGIS 3. I am using 30 meters for my buffer. My problem is the buffers came out as a circle, not following the lines. This is what happens during my buffer
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127 views

Finding rivers from GeoTIFF files with GDAL

I've grabbed a bunch of .tif-files (from http://dwtkns.com/srtm/) and I am trying to render it in 3D as terrain. I've converted it to a 16-bit heightmap successfully but I am curious is there any way ...
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175 views

Converting River Channel Cross-Section Data to Bathymetry

I have multiple surveyed cross-sections of river channels and need to convert this data into 3D polylines (shapefile) for use in a hydraulic model. The cross-section data is typically supplied in &...
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19 views

Looking for rivers data of South Italy

I am working on a twelfth-century description of South Italy (Calabria, Apulia and Campania) which describes rivers that are now dried up. I am attempting to create maps which reflect the description ...
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River flow accumulation: % upstream deforestation area as input

I am trying to create a 'flow accumulation' raster whereby each river pixel tells me the % upstream area that has been deforested. This screenshot shows the HydroSHEDS Flow Accumulation dataset. I ...
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97 views

Understanding DEM of difference results in ArcGIS Pro [closed]

I am looking at channel change in a river in the UK and am using three DTM rasters to observe change over time. One of the methods I am using is to simply minus one DTM from another. I have got the ...
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56 views

Counting upstream dams along river network in QGIS

I am working on QGIS. I have a river network where each segment is a line with ID from the upstream one (if any) and the downstream one (if any). I also have information on: location of dams location ...
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9 views

Detecting how far a river runs along a boundary between two administrative regions when digitisation errors mean they do not coincide

I am trying to find the lengths of rivers within and on the boundaries of administrative areas ("districts"); I need to distinguish between the length within districts and the length along boundaries (...
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88 views

Help with Anita Graser's guide on making tapered rivers. River shapefile has “width” field but expression is not working

https://anitagraser.com/2017/04/17/better-river-styles-with-tapered-lines/ This is her expression CASE WHEN "GEW_GRKL" = '< 10 km2 Fluss' THEN 0.2 WHEN "GEW_GRKL" = '10 km2 Fluss' THEN 0.4 WHEN "...
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91 views

Measure distance to coast along river

I have a dataset on rivers and a dataset on the location of dams. I want to calculate the distance from the dams to the river’s mouth at the coast along the river (not the shortest distance) for those ...
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1answer
156 views

Connecting river segments with R riverdist package

I have imported river courses from OpenStreetMap into QGIS in order to recreate the Rhine river system for analysis in R with the riverdist package. In order to calculate distances between sampling ...
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2answers
271 views

ArcGIS Pro: Create polygons from outlines of unclosed lines

First a disclaimer: I have very little experience with ArcGIS, I usually use QGIS and only recently started using ArcGIS Pro. I have a River dataset from the Natural Earth Site, then made its ...
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1answer
60 views

GRASS GIS: creating raster with a certain gradient and extent

Constraints - Use only GRASS GIS - Automated using pyGRASS Input DEM River raster OR river as vector (both are computed) gradient of the valley (as a float) vector line with direction and magnitude ...
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29 views

Interactive tool for editing TIN data

I created TIN to generate DTM using Mass points from Lidar data and river data that I made from stereoplotting. TIN results show there are several locations where the river elevation floats. So I have ...
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224 views

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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235 views

Removing bridges and dams from DEM

Is there anyway to alter elevation of DEM where there are bridges and dams for the flood routing of the River? I have to calculate discharge of the River from ancient times so at that time there ...
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2answers
300 views

GRASS GIS: Computing center line of raster feature representing a river

My goal: Convert a raster layer representing a river feature (see picture) to the center line of the river stored as a polyline feature. Limitation: The whole process has to be automated. I can ...
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1answer
76 views

Linearized map of rivers - what is this called? [closed]

I am looking for a "linearized overview" map (as in the figure below) of the Brahmaputra river. I don't know the exact name of this type of map. Do you have any suggestion on what I should look for, ...
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56 views

Determining distance to nearest location along stream network by each cell using GRASS?

I have a river network in raster and locations of many dams on the river. In the image above, the BLUE point represent one random cell. Dam 1 is downstream to the cell. I am looking to calculate ...
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1answer
168 views

Calculating Distance from Outlet to Dam(s) using ArcGIS Desktop?

I am trying to carry out what should be a relatively simple analysis of river network fragmentation by dams. Similar questions have been asked as: Obtaining length of river upstream of points up to ...
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1answer
285 views

Simplifying stream network based on grid using QGIS?

I have a river network (blue line in the below image) and I need to simplify this based on a grid. I basically need to snap the river to the closest vertex or middle-of-side of the grid cell's bounds (...
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1answer
542 views

Cartopy lakes and rivers are clipped

I'm trying to produce a map showing water bodies like oceans/rivers/lakes polygons for purposes of plotting vessel voyages using cartopy. Ultimately I'm looking to create a sea mesh grid using the ...
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2answers
65 views

Calculating percentage (or length) of stream network that is multiple channel streams using ArcGIS Desktop?

I have a polyline stream network of all channels within a drainage basin (which is 1.1 million square km) A number of the rivers in the basin alternate between single thread and multichannel (i.e. ...
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2answers
172 views

Select a specific line length after and before a point

As you can see from the attached image, I have a shapefile of river network (line) and a point shapefile (this one represents the middle point of transects carried out in the area). I'm trying to ...
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1answer
250 views

Rainfall-weighted flow accumulation

I am perfoming a geospatial process whereby I want to use the flow accumulation (as an input for discharge proxy) in calculating stream power. I am using ArcGIS 10.2 So far I have: 1. Valley/channel ...
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1answer
49 views

storage in dams on a river system above specific points

I want to find the storage in dams snapped to a set of polylines defining rivers above specific points on each river. Using ArcMap 10.3 I have the polylines representing rivers, the points denoting ...
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37 views

Assure the continuation of rivers (raster dataset)

I am creating a cost surface raster for identifying least cost paths for road constructions. One of the factors influencing the cost is water cover. I am using Landsat based Global Surface Water ...
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1answer
83 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
248 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
397 views

Calculate mileage river network

We have a river network which doesn’t correspond to the reality shown by the orthoimage. Each river has the same route number (see attribute table). Every route number has several segments (see ...
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166 views

DEM provided contains high elevations (trees) that I wish to remove - is this possible

I wish to remove trees off my 3D aerial (high elevations). The files provided are .tif - unfortunately the trees are causing quite a bit of noise. Is there a way to set an elevation to remove them? ...
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1answer
334 views

Building walls to correct channelized flow in ArcHydro

My current project entails burning in a known river network into a high resolution (10x10m) DEM. In doing so, I'm attempting to build walls to correct for channelized flow in the DEM, in order to ...
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36 views

Can I determine hydraulic load on river bank with hec-ras? [closed]

I want to calculate the force exerted by wave action on river bank. If I know the discharge, flow rate and water level, can I calculate the hydraulic load acting on river bank with hec-ras? If not,...
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41 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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1answer
364 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
459 views

Calculate river distance to headwater for every pixel?

I already posted a similar question a few weeks before. But since my dataset changed and I still havent solved it, I thought its good to post a new question instead of editing the old. Using ArcGIS ...
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1answer
117 views

Extract polygon from stream line

I would like to delineate the polygon of a basin from an already delineated stream work. In the example, I want to extract an approximate polygon from the selected stream network in yellow without ...
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1answer
244 views

River network distance from each raster cell

I have a river network shape (or raster) and need to calculate the distance (river, not straight line!) for each pixel (or if not possible for lets say every 10 meters or for a random set of points) ...
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1answer
902 views

Distance from one point to multiple points WITHIN a shapefile [duplicate]

I am looking to calculate the distance from a main point to multiple points WITHIN shapefile. In other words: I have a main point at the mouth of a creek. I have about 1,200 points at various ...
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1answer
138 views

Counting points B downstream of point A along polyline using GRASS?

How do I determine how many barriers are downstream of each sampling location on a river network using GRASS? Resources I have ~20,000 points, soon to be ~600,000 points, falling on or near a river ...