Geographic Information Systems

Questions tagged [rivers]

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A river is a flowing body of water

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1answer
50 views

Calculating area in QGIS, defined as zone with relative elevation compared to a river

I’m trying to do the following in QGIS. When creating a 3D map, I want to follow a line or area of interest, such as a river, and create an area which is measured perpendicular to the line of interest,...
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0answers
65 views

Ordering points along river in QGIS

I found data on water treatment facilities in the EU (labelled in green on the map) and stations that control for water quality in rivers (labelled in black). I'd like to get a list of treatment ...
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28 views

Interpolated Line shows in EPSG:4326 but disappears in others

I'm trying to stylize rivers but it's impossible since Interpolated Line ("tapered line") shows only in EPSG:4326 but disappears in EPSG:3857 and EPSG:25835. I have no idea why is that.
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11 views

How to download NHDFlowline data for the Lower Colorado (area 15)

https://www.epa.gov/water-data-and-tools/nhdplus-lower-colorado-data-vector-processing-unit-15 doesn't seem to have a download link. Maybe https://nhdplus.com/NHDPlus/NHDPlusV2_15.php has them but ...
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39 views

Does most topographic data come with Z Coordinates, and if so how do you put them in a QGIS map?

I am trying to create a map of the rivers in a large catchment. When I try to 'fill the sink', mine makes it as if the surface is flat. My rivers are just squiggly lines. It doesn’t look like it has ...
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22 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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40 views

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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16 views

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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0answers
57 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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1answer
358 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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41 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 ...
3
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1answer
143 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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1answer
79 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 ...
2
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1answer
68 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 ...
0
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1answer
62 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
90 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
2
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2answers
199 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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0answers
294 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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23 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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51 views

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 ...
1
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1answer
138 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 ...
3
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0answers
72 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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1answer
99 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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0answers
106 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 ...
1
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1answer
179 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 ...
2
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2answers
557 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
73 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 ...
2
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0answers
308 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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1answer
331 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 ...
3
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2answers
392 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 ...
2
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1answer
256 views

Forcing left to right order of cross section lines of river using QGIS

Based on "Generating a series of cross sections (profiles) along a line?" post, how can I force the cross-section lines to be created, thus collecting elevation data, from LEFT to RIGHT ...
0
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1answer
96 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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0answers
62 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 ...
2
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1answer
195 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 ...
2
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1answer
324 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 (...
0
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1answer
616 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 ...
0
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2answers
80 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. ...
3
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2answers
181 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 ...
1
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1answer
299 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 ...
1
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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 ...
2
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0answers
39 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 ...
2
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1answer
100 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/...
3
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2answers
280 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 ...
2
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1answer
452 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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0answers
267 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? ...
0
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1answer
372 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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0answers
41 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,...
0
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0answers
44 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 & ...
5
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1answer
430 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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