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Questions tagged [rivers]

A river is a flowing body of water

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To and from nodes in stream network using Whitebox Tools (in R)

I am experimenting with the WhiteboxTools via the WBT library in R. This is to design a scriptable and open-source workflow to extract stream networks from a digital elevation model (DEM). From ...
RJPS's user avatar
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Create an i graph object with sf objects using the i graph package in R to perform a network analysis

I would like to create an i graph object out of two sf objects. The first one includes the edges represented by polylines, in that case rivers. The second one includes vertices that lie on the river ...
IchmagNuss's user avatar
2 votes
2 answers
73 views

Curved labeling of rivers in QGIS doesn't always work

I need to label some rivers using curved placement. Sometimes the labels appear, sometimes they do not. I'm sure part of my problem comes from the rivers being divided up into short sections as ...
Joshua E. Vines's user avatar
-1 votes
1 answer
57 views

MULTI RING BUFFER VECTOR LAYER TO RASTER [closed]

I have a line vector file in qgis in which I run the multi-ring buffer command to divide the area into 200m zones from the river because I want to make a flood hazard map. So I have a multi ring ...
Rafaela Zylali's user avatar
0 votes
1 answer
42 views

How to find a specific distance upstream from a point

I am trying to find a simple way to map sections of a river which are covered by a Mink trap. So I have a river layer and a points layer for where the traps are placed. I want to select all rivers (...
Owain's user avatar
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1 vote
1 answer
30 views

Repeating label of line shapefile does not work

In QGIS, I have a river which I want to label multiple times. When changing the settings in the placement section of the label setting, it does not make a difference. It still displays the label once. ...
Lina's user avatar
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2 votes
0 answers
167 views

ERROR 010658: Failure in distributed raster analytics operation. Error when using hydrology tool 'Fill'

I'm currently doing a watershed delineation and river morphology computation using ArcGIS Pro. I have the DEM of the area and started with the hydrology tool "Fill" but it keeps having an ...
zxz_341's user avatar
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Reclassifying polygon ID in vectorized raster according to different layer

Goal: I am trying to create a lookup table for depth according to three discharge levels of a river, 250 cfs, 800 cfs, and 1500 cfs. I have raster files for all three that I have vectorized into ...
Lauren Diaz's user avatar
1 vote
1 answer
65 views

Minimized distance between points while staying INSIDE of a designated polygon

I am a fisheries student and am currently tracking fish movement in a lake. I am trying to assess their optimum/minimized distance moved between each sequential location for each fish. However, I can ...
Marcus Prull's user avatar
0 votes
1 answer
55 views

For each segment in a polyline, I need to calculate the sum of an attribute for all objects upstream [closed]

I have a river network in polyline format and I want to accumulate an attribute in the direction of flow. For every single polyline object (stretch of river), I’d like to calculate the sum of an ...
Ben_123's user avatar
  • 53
1 vote
2 answers
239 views

How to get centerline of the mask images

I am working on the centerline extraction, I have tried skeletonize, RivGraph and several other methods but could not get a good centerline. First the line on the ends are not following the center and ...
H Tai's user avatar
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I have tried to generate river network but it is not according to reality. Instead it shows very small lines?

I want to show river network on DEM data of a region. The procedures that I have followed: Downloaded the DEM data of area and add it to QGIS Clipped the study area out of it through Raster tool ...
M Suraj's user avatar
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0 answers
141 views

How to calculate the polyline area in QGIS

How to calculate the polyline area in QGIS?I have the width and length and I want to calculate the area of the river using that information so I can redraw my river using the area size calculated. ...
Nurul Nabilah Mahmud's user avatar
4 votes
3 answers
344 views

Calculating minimum river width for a route within the river in PostGIS/Python

I have a complex ancient river system containing islands and multiple channels. I also have line segments defining a vessel's path along the river: I use PostGIS to hold the data, the river system is ...
ronix75's user avatar
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1 answer
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Looking for automation tool for editing polyline to follow LiDAR layer

I have been tasked with editing lines to more accurately follow rivers according to a LiDAR layer. I am currently editing the vertices that are not accurately aligned but there is just way to many ...
jimbybob1's user avatar
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0 answers
247 views

How to extract contour lines from bathymetry profiles (mainly cross sections)

I need to extract contour lines from surveyed bathymetry profiles. The profiles are .csv files with multiple points and X, Y and Z coordinates. There are cross sections and a single longitudinal ...
tukanium's user avatar
  • 211
3 votes
1 answer
157 views

Adjusting flow direction of river based on DEM in QGIS

I have a huge vector layer as a line, that represents the river. The problem is that the flow direction is sometimes wrong (goes uphill). But I can't correct that manually, cause the layer is too big. ...
katagena's user avatar
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1 vote
2 answers
187 views

QGIS Tapered rivers for entire landmass

I have a huge river network on my hands (see screen capture below), and would like to style its vector lines to get tapered rivers. Some tutorials out there explain how to taper rivers (see links ...
CyanideBaby's user avatar
1 vote
2 answers
314 views

Why are my channels generating straight lines?

I'm having a rather horrible issue where my rivers decide to be straight lines instead of following the DEM I am using. Can someone explain why this is happening, and what I can do to solve this ...
Meep the Changeling's user avatar
0 votes
2 answers
59 views

Showing historic path of river using ArcMap [closed]

I am trying to create something similar to the image below for Molonglo River in the ACT using ArcMap with several TIF tiles I have mosaicked together but no luck thus far. Does anyone have any ...
Halena's user avatar
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0 votes
1 answer
377 views

Determining maximum capacity of river using HEC-RAS

Is there a practical way to determine the maximum hydraulic capacity of a river in HEC-RAS? I would like to know for each cross section of my 1D model what the maximum flow rate will be before ...
ZKB's user avatar
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2 votes
0 answers
98 views

Bringing river bed to the same height as surrounding ground in QGIS

I have a DEM containing the current flow networks in an area. I also have a shapefile showing the same flow network. I would like to derive a new river network to see how water would flow if the ...
Sofia's user avatar
  • 21
1 vote
1 answer
218 views

Split seamless polygon representing river banks into separate polygons using center lines

I have a polygon that represents river banks. This polygon is seamless for all rivers. And I also have lines of each river. Here is the example of one situation: Is there a way to split the seamless ...
Andrius's user avatar
  • 53
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1 answer
72 views

Ordering points along rivers in ArcGIS

I have data on the location of water treatment facilities in the EU (green in the map) and of stations that control for water quality in rivers (blue in the map). I'd like to get a list of treatment ...
Sven Christens's user avatar
0 votes
1 answer
162 views

Changing placement of label to be underneath curved line ArcMap Maplex label manger?

I'm working on a labeling rivers in an ArcMap project. For rivers but one the standard river placement works but I need a way to place the label of one river below the river not above like the ...
Nick C's user avatar
  • 37
3 votes
1 answer
479 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,...
quoteunquote's user avatar
2 votes
0 answers
202 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 ...
Sven Christens's user avatar
0 votes
0 answers
52 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.
zero signal's user avatar
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0 answers
44 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 ...
Danielle's user avatar
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0 answers
37 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 ...
Jacqui's user avatar
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1 vote
0 answers
335 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 ...
Melissa Vanderheyden's user avatar
3 votes
1 answer
257 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 ...
neubert's user avatar
  • 370
1 vote
1 answer
2k 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 ...
Linkr1's user avatar
  • 11
5 votes
0 answers
119 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 ...
Handriyanti's user avatar
3 votes
1 answer
1k 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 ...
Blizzard's user avatar
  • 197
2 votes
2 answers
335 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 ...
Will's user avatar
  • 31
2 votes
1 answer
261 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 ...
Jack M's user avatar
  • 131
0 votes
1 answer
132 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 ...
Dan's user avatar
  • 1
1 vote
2 answers
367 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
Amanda's user avatar
  • 19
2 votes
2 answers
605 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 ...
KaiserJohaan's user avatar
2 votes
1 answer
1k 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 &...
davehughes87's user avatar
0 votes
0 answers
102 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 ...
Katherine Jacka's user avatar
0 votes
0 answers
144 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 ...
Olivier's user avatar
  • 105
1 vote
1 answer
426 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 ...
ynxblx's user avatar
  • 358
7 votes
1 answer
215 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 ...
RiversAnalysis's user avatar
0 votes
1 answer
148 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 "...
BallpenMan's user avatar
  • 1,217
3 votes
0 answers
192 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 ...
Sven Christens's user avatar
1 vote
1 answer
340 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 ...
Stockfisch's user avatar
3 votes
2 answers
2k 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 ...
TheKutKu's user avatar
0 votes
1 answer
153 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 ...
MarcM's user avatar
  • 1,156