Geographic Information Systems

Questions tagged [rivers]

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A river is a flowing body of water

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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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11 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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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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31 views

How to remove 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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10 views

Modeled quickflow data per pixel

community! I'm running a hydrological model called Seasonal Water Yield from InVEST, based on monthly precipitation rasters, monthly ET rasters, a land use raster and watershed shapefile. One of the ...
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2answers
70 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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34 views

Calculating elevation difference along river using ArcGIS Desktop?

I am working on a project to calculate the hydropower potential of a river using ArcGIS Desktop. I have derived a river flow raster and now need elevation difference in order to calculate pressure ...
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1answer
69 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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51 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
72 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
145 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
225 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
41 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
119 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
111 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
40 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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30 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
56 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
135 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
198 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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56 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
149 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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26 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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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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1answer
143 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
239 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
86 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
125 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) ...
2
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1answer
435 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
95 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 ...
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1answer
92 views

Stream order from flow accumulation raster

I am looking to get Strahler Stream Order vector from a flow accumulation raster of a river network. I only find solutions with an elevation or direction raster. Can I do this with GRASS?
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1answer
305 views

Making rivers with higher Strahler/stream order wider in QGIS?

I have a river network and the Strahler order of all rivers in it. Now I would like to create a map similar to this one http://www.hydrosheds.org/, i.e. with rivers of a higher Strahler order being ...
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1answer
138 views

Finding distance from river outlet to points, following river, using ArcGIS Desktop?

I have a line (the river (in blue)) and a shapefile of points (plants colonies (in orange)) and I need to find the distance between the river outlet and many points along the river instead of "as the ...
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1answer
28 views

Is there a United States waterbody index number available?

In searching for this, I see that in some countries they have a waterbody index number, a unique ID for each water body. Does such a system exist in the US and is it available online or from any ...
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2answers
89 views

Creating DEM using ArcGIS Desktop?

I am new in this field and I am having a problem with my DEM, (SRTM 30M). When I calculate flow accumulation a straight line appears if I fill the DEM. And rivers are not connected if I don't fill ...
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1answer
265 views

Obtaining length of river upstream of points up to next point using ArcGIS Desktop?

I am carrying out a study which aim is to come up with a list of priority obstacles to fish migration to be removed based on those where more extra habitat would be created after the modification. I ...
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1answer
49 views

Number points along polyline while keeping information on preceding point

I'm working with river networks and need to create ID for points along it. Trick is that points need to have its own ID and also keep the ID of the preceding point (in two separate columns of course)....
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1answer
195 views

Missing/inconsistent River Thames map data in Overpass Turbo

I have noticed the River Thames cut off quite abruptly when applying the following query to Overpass: ( way["natural"="water"]({{bbox}}); ); out body; >; out skel qt; The resulting data is ...
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0answers
62 views

Inland shipping GPS data, flag upstream/downstream movement [closed]

In the context of greening the inland shipping industry I am analyzing GPS data on moving ships. For these ships I would like to separate the data for upstream/downstream movement (up/down river). ...
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0answers
801 views

DEM Reconditioning / Stream Burning with ArcHydro [closed]

I have a specific question concerning ArcHydro. I'm using ArcGIS 10.4.1. My goal is to burn water/streams (a shapefile) 2 meters into a DEM that I have acquired from USGS (see image). The cell size ...
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80 views

Create junction raster from stream and road rasters

I have converted two vector polyline datasets to raster format. One represents streams, and one represents roads. I need to create a third raster layer that contains cells where there are stream ...
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1answer
162 views

R or ArcGis: average per polygon of the shortest distance to a river from each point in that polygon

All the shapefiles necessary can be found here. These are shapefiles of lakes, and rivers. Downloading one shapefile as an example should be enough to get me on the right track. The nuts file can be ...
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1answer
807 views

How to interpolate raster data using computer vision (OpenCV)?

Background A raster file collected via LIDAR records the topography of a watershed. To properly model the watershed, the river must appear continuous without any breaks or interruptions. The roads in ...
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1answer
256 views

How to perform an anisotropic Elliptical Inverse Distance Weighting (EIDW) interpolation in R?

River bathymetry is generally more variable in the transverse than the streamwise direction, so I need to use anisotropic interpolation technique like Elliptical Inverse Distance Weighting (EIDW) (see ...
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3answers
803 views

How to go about creating points at river confluences?

Working in ArcGIS 10.4. I have a rivers dataset, and I want to create a point wherever two rivers meet (tributaries join with other rivers, etc.). I tried the Intersect tool, but I think that tool ...
2
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1answer
31 views

Is there a standard way to show navigability of waterways?

Is there a standard (or common) way to indicate whether a river is navigable? Even better, are there standard ways of showing various grades of navigability (accessible to small craft only, ...
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32 views

Applying values to highest terminal segments in channel network using PostgreSQL?

I extracted a channel network from a dem but due to some technical difficulties the layer had some discontinuities. So after filling them, i suddenly realised that the Strahler orders it gave me were ...
2
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1answer
2k views

Seeking outline coordinates of bodies of water (lakes, rivers, ponds) for country? [closed]

I'm in need of acquiring the coordinates of the outlines of all the water bodies inside a country, with the exception of "Sea" or "Ocean" water. Right now, I'm manually outlining the lakes and rivers ...
4
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3answers
2k views

Get rivers from a DEM raster

I am new to spatial analysis and even newer to hydrology. I have a 30arc DEM elevation raster and I was wondering if I can use it as an input to get the approximate presence of rivers in a ...
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1answer
58 views

Looking for data on river flow speeds

I'm looking for sources containing data on measured river flow speeds, any / all locations worldwide, in any format or language. Googling didn't help much.

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