Questions tagged [elevation]

The vertical distance of a point or object above or below a reference surface or datum (generally mean sea level).

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Extract Elevation data from DEM and add Z-Values to Polyline file

Is there an efficient way to add elevation data from a DEM Raster to a polyline shapefile? I am attempting to add elevation data to a city roads shapefile to map out flash flooding issues. The streets ...
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QGIS Apply Correction to Elevation Datum

I am wanting to apply a blanket correction to a bathymetry layer i.e. add 2m to every DEM cell. I assume I do this in the Raster Calculator but I'm unsure of the command line to use.
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In QGIS change DEM elevations values from positive to negative

I have a DEM that currently has positive elevation values for bathymetry and negative values for those above sea level. How can I convert these cell values to negative for bathymetry and positive for ...
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How to add Height to specific coordinates in meter in the attribute table in QGIS 3.22.4

I would like to add the height/elevation of a specific topographic point into my attribute table. I calculate x- and y- coordinates as well as the dms-coordinates in the field calculator by code and ...
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Why is the Elevation Z Data not showing in the bottom tool bar along side the coordinate data in QGIS?

I have been using Globalmapper for around 10 years and just recently started exploring the capabilities of QGIS to compare if QGIS has any major advantages. Mostly our work is with DEM and LiDAR Point ...
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Extracting/Filtering of string data based on z Coordinate

I have been supplied with a complex 3D file of a historic mine in .dxf format. The plan is made up of a series "slices", each slice captured at a specific elevation. I have successfully ...
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CORDEX and CanRCM4 data lapse rate

I am using CanCRM4 data from the CORDEX model for modelling ice cap mass balance. I was wondering if anyone had any information about the type of lapse rate used in this data set and if it can be ...
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Locating / identifying depressions on a DEM (QGIS)

I have a 1m DEM and on this DEM I want to locate the surface depressions. For a reforestation project I would like to know the surface depressions because of the effect they can have on soil moisture ...
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elevation has correct range in metadata, but shows 0 for pixel values

IMG elevation raster lists correct maximum and minimum values (811.958, -410.72) and average (110), but no matter which type of symbology is chosen, all pixels display as 0. What do I need to do to ...
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Elevation .img showing 0 for all pixel values

IMG elevation raster lists correct maximum and minimum values (811.958, -410.72) and average (110), but no matter which type of symbology is chosen, all pixels display as 0. What do I need to do to ...
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How do you calculate area within separate 100m elevational bands from a DEM in R? [closed]

I am trying to calculate the area within each 100m band of a digital elevation model (DEM) raster in R. Does anyone have suggestions on how to do this?
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Finding elevation of polygon [closed]

I am trying to find the elevation of a flood polygon. Is it possible to do either using ArcGIS or QGIS or in Python? I understand that for the point feature, we can find it but what about multiple ...
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Incorporating bridges into DEM for route profiles

I'm using ArcGIS Pro. I'm making transit route elevation profiles to see how the topography changes over the course of certain bus routes. The data I'm working with: DEM of the study area GTFS tables ...
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Finding minimum elevation along the edges of polygon

I am using ArcGIS Pro. I have a polygon and a raster, and I would like to know what the lowest elevation is along the edges of the polygon. I would want each polygon to have a field that has the ...
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Calculating the mean elevation of a DEM in QGIS

I have a DEM for a specific region and I want to know the mean elevation of this DEM (the average Z value of the whole raster). I'm working with QGIS with GRASS. This seems like a really easy question,...
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Calculate the distance between points and contour lines

Is there a way to calculate the distance between points and contour lines with a minimum elevation value ? Context: I have data from vegetation plots in island that is mostly flat, with the exception ...
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Geting elevation data from online services in QGIS?

Is there a way to add an elevation data provider in QGIS - something like XYZ tiles connections? There are many providers available online (like this one - Terrarium elevation data) When I add them as ...
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Calculating percentage of polygon area that is greater than an elevation of a polygon from a diffrent layer in QGIS 3.14

Working with QGIS 3.14. I have a layer of 7000 Wetland Polygons each with a maximum elevation attribute. I also have a layer of watershed polygons that each of the 7000 polygons are within. I also ...
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Merging DEM elevation attributes with streets shapefile

I have a DEM and a separate shapefile of all the roads within the bounds of the DEM. I want to combine the elevation data with the road data so that I can have the roads displayed with a graduated ...
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How can you create a polygon in QGIS which covers a certain elevation range?

I am trying to isolate 3 different elevation ranges in QGIS (200-1200m, 1200-2200m, 2200-3200). I have made contour lines for each elevation but I want to make them into separate polygons so I can ...
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Applying elevation correction to DEM raster in QGIS (using landcover classification vector)

I'm a wildlife ecologist attempting to correct a digital elevation map (DEM) generated from UAV data. As expected, I encountered a positive bias in my DEM elevations in areas of dense vegetation. I ...
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Filter DEM image collection for elevation band value greater than 0, to show land only - Google Earth Engine

I'm trying to display only the land areas of a DEM image collection, by filtering the image collection for values greater than 0. I am not sure how to write the arguments properly. There is only 1 ...
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QGIS "Profile Tool" Plugin inaccurate reading

I'm getting an inaccurate reading from QGIS "Profile Toll" plugin as you can see in the image below. Not only is showing incorrectly which of these two peaks is the highest, but also the ...
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2 votes
1 answer
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Lowering GeoTIFF raster by fixed value using QGIS

I'm trying to find a way to lower a GeoTIFF raster file by a fixed value. I will try to describe my process so far. I start by downloading a GeoTIFF from the usgs webviewer, these are in CRS "...
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Is it considered best practice to project a raster before computing zonal statistics?

I have DEM data that is in a GCS (NAD 1983 (CSRS)) with vertical units in meters. My understanding is that before doing any processing on a raster, the horizontal and vertical units should be made to ...
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Creating Contour Lines in QGIS 3.16 with a distance of 0,10 m

I would like to create Isohypses (Shape) ("Create contour lines") with a distance of 0,10m in a Digital Terrain Model (Shape File). While processing the command, there are some errors poping ...
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Creating 3D base for map (like extrusion into negative) using ArcGIS Pro

Using ArcGIS Pro 2.8, I created a raster of a 120x120 m forest quadrat, and projected it onto an elevation surface containing elevation data for the quadrat. I now want to add a 3D base to the map, to ...
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Exporting terrain shape vectors

I'm trying to export from QGIS a physical map, with terrain info (shades from green to brown so to speak). I managed through Contour tool to have the single lines altitude map and export to SVG, but I'...
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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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Identify real world elevation for digital elevation (DEM) GeoTIFF

This seems like it should be simple, but I have been struggling to figure out the best way to identify the real world minimum and maximum elevations from a GeoTIFF I downloaded from the National Map. ...
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How to get ICESAT-2 ATL03 elevation photons over range of dates?

Anyone familiar with Open Altimetry? I'm trying to download all available elevation (ATL03) data for an AOI. I'm interested in seeing if I can interpolate a DTM from the photon data. The trouble is ...
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Vector Ruggedness measurement output ranges from negative to extremely low value

I have an elevation map of the states of Wisconsin, Michigan and Minnesota (pretty flat states in general), with elevation ranging from 174 to 642.739m above sea level. Using the Archydro tool of ...
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Frontal Area of buildings using QGIS

I have to calculate the frontal area index of buildings in a city (λf) which is the total area of buildings projected into the plane normal to the wind direction (Aproj) divided by the ground plan ...
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Level curves in ArcGIS map - elevation - topography

I am using the ArcGIS web map and need to add a contour map (level curves for Uruguay) to perform a topography analysis. I have seen that in the ArcGIS Online search engine there are some maps of this ...
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Seeking SRTM 90m data

I'm looking for 90 meter resolution SRTM data to coverage a large state in the Western US. I used to use Derek Watkins' awesome tile grabber for SRTM90: https://dwtkns.com/srtm/ but as he explains on ...
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Elevation profile that takes into account earth's curvature

My class doing some experiments with push to talk radios and line of sight. Google Earth Pro has an option that displays the elevation profile between two points (really cool btw), but I'd really love ...
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Choosing Window Operator for 1-D Elevation Data

Have an interesting theoretical question here: Say you have a swath of elevation data that is essentially a line of densely spaced points. The data is noisy, so a simple median filter is something I ...
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1 answer
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How to get Copernicus DEM GeoTIFFs for a bounding box using Python

Background According to AWS's Copernicus Digital Elevation Model page, The Copernicus DEM is a Digital Surface Model (DSM) which represents the surface of the Earth including buildings, ...
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How to connect the points (bus stops) to the near closest points on lines (height profile) to determine their height profile

I am doing my bachelor thesis with QGIS program and I need some help please. I have tried until now to get the elevation profiles of the bus stops. But these are outside the bus line as shown in the ...
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3 votes
1 answer
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Adding elevation data to line using ArcGIS Pro

I am using ArcGIS Pro. I want to draw a line at the starting and ending of elevation, and then use straight line interpolation to assign the rest of the line an elevation.
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Comparing polylineZ elevation to DEM at various points along the line, not just the vertices

I have a polylineZ feature that represents sewer lines. I am looking for areas where points along the line may be above ground elevation, representing aerial lines. The problem is that I need to ...
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Extracting elevation data from DEM with Python [duplicate]

I have downloaded a DEM model for a given region. I use rasterio like this: import rasterio dem_path = 'path_to_dem.TIF' list_of_points = ((42.136097, 24.742168),) def get_offline_elevation(...
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2 votes
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R Error in sp::CRS(SRS_string = "4326") : no arguments in initialization list

When trying to use the get_elev_raster from the elevatr package, I am running into an error which seems a few libraries deep. As a basic reprex: library(sf) library(elevatr) luxembourg <- readRDS(...
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Getting ArcGIS Pro's default elevation data (z-value) as layer

ArcGIS Pro displays coordinate values and z-values (elevation) as part of its basemap when moving the cursor across a 3D scene. This information is supplied by the WorldElevation3D/Terrain3D elevation ...
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Converting 3D model to heightmap in form of image

I have got about 20000 small 3D models in form of .glb files. Is there some way to project them onto heightmaps with GDAL or other software?
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Adding height from xyz-layer to points in Vector layer in QGIS

My task is to put the height from a DGM1 model in Germany to some points on an other vector layer with attribute table. I don't know how this possible. Any ideas?
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3 votes
1 answer
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Displaced elevation SRTM files in QGIS

1) The problem: I'm downloading layers for some work and I realized the elevation files (SRTM 90m) are displaced, I mean, the zero value is not the same I guess. I'm attaching photo below. They are ...
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2 votes
2 answers
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Relation between Solar Radiation and Elevation: Satellite Data

I used DSR (Downward Shortwave Radiation) data from MCD18A1 product and GHI (Global Horizontal Irradiation) data from SOLARGIS to create solar maps: Using this elevation map: I see that the solar ...
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-1 votes
1 answer
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Calculating average elevation from given points layer and DEM

I am using QGIS 3.18. I have a point layer showing population estimates at the administrative center points and an aster digital elevation map. I'm trying to calculate the average elevation of these ...
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Adding Z (elevation to image when georeferencing with gdal_translate and gdalwarp via gcps)

I have been trying to georeference an image with given gcps (X-Y coordinates and Z (elevation) coordinates). However, when I add gcps via gdal_translate it adds elevation Z but as soon as I use ...
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