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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21 views

Highlighting terrain only between defined elevation range [closed]

I am trying to highlight terrain between two elevations in order to highlight where certain plants could be found. For example if a plant in found in a certain valley between 600-1200m, I'd like to be ...
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21 views

QGIS Profile Tool: What do the table values represent?

I am currently playing around with the elevation profile tool plugin for QGIS. I am trying to utilize the table that is creates as a part of the profile but I am having trouble identifying what the ...
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Getting elevation profiles for all US roads in OpenStreetMap [closed]

I'm exploring a project where the objective is to find all significant climbs on roads in the United States in an unsupervised and comprehensive manner. To get started I need two datasets, one for ...
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33 views

Splitting DEM based on elevation using ArcMap?

I am trying to split a DEM TIFF file into three separate shapefiles (upland, middle and lowland) on ArcMap 10.6. I have used natural breaks to classify the DEM into three elevation categories. How do ...
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43 views

Finding distance of line segment considering elevation in QGIS?

Normal distance can be easily computed in QGIS. But how can I do it for a line feature in 3d space, simply saying how to to find the line's distance noting its elevation. For example, if a polyline ...
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37 views

Earth engine - ee.Terrain.slope() output at wrong resolution after DEM mosaicking

The big picture: I'm using Google Earth Engine (Javascript) to do a terrain correction on Sentinel-1 imagery, as in Andreas Vollrath's work. However, I want to use a higher-resolution Canadian digital ...
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47 views

How to get the value of specific pixels in Google Earth Engine

I want to extract the value of some pixels. I have already select the pixels that I want to extract the value with this code: var pixel_snowcover = glacierfilled_M1.select('albedofill1').map(...
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42 views

Transform height position from ECEF (EPSG:4978) to RH2000

I'm a novice regarding coordinate system and projections, and I'm trying to transform ECEF coordinates (projection adopted by Cesium) to the Sweref99 projection including the RH2000 height system (for ...
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61 views

Storing elevation for hiking paths as polylines

I need to store the z value for hiking paths. I have the GPS coordinates (points) and the tracks (polylines). I know I can store elevation data easily with the points but are there any ways of storing ...
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105 views

Downloading elevations in different resolutions using worldwind

I'm new in NASA worldwind and I want to download elevation with NASA worldwind and then use it offline. I have a bbox as follow: int minX = 20; int maxX = 80; int minY = -80; int maxY = 80; I'm using ...
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How to add Elevation to a QGIS 3.12 attribute table for shapefile points

What code do I use in the Field Calculator of the Attributes Table within QGIS 3.12 to generate the elevation of shapefile points in feet?
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Global Mapper - How can I export point elevation from file .kmz or kml?

I want to get point elevation from file like pic below? Anyone know about it! Thank you!
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quite different results in spatialEco::tpi with circular and rectangular window

In R, I have an elevation raster. I want to calculate the topogographic position index using the spatialEco::tpi function. The CRS of the elevation raster is "+init=epsg:5677"; the CRS unit ...
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27 views

Export 3D DXF elevation line with multiple Z-values to points each with a discrete Z-value

We are using a new program that outputs DXF lines with elevation data. I need to compare this data over multiple time-series, but I don't know how to extract it. If I use the identify tool, I can see ...
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Creating line profile graph in ArcGIS Desktop 10.6 with 3D Analyst for multiple line features

I'm looking to create profile graphs for approximately 150 streams in a 3D feature class. I made a sample profile graph but I'm not sure how to automate the process to run through the remaining lines.
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How to add elevation data to tif to create DEM (SRTM satellite data)

I have a .tif created from the SRTM satellite data. The tif should already be DEM data as it was collected from the SRTM satellite. When I open the tif in ArcGIS, I don't see any height or z data, ...
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32 views

Elevation statistics NUTS-3

I downloaded European-wide DTM from https://land.copernicus.eu/imagery-in-situ/eu-dem/eu-dem-v1.1/view I obtained the NUTS level 3 shapefile from: https://ec.europa.eu/eurostat/de/web/gisco/geodata/...
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How to add z value vertices from a point layer to a line in QGIS?

I created a point layer from a line using Vector geometry/Extract vertices in the Processing toolbox. The purpose is to extract the elevation from a DEM into the points corresponding the vertices and ...
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39 views

Empty result layer was created by raster calculator

I'm a new user of QGIS and learning some tips from this book https://www.amazon.com.au/Learn-QGIS-Andrew-Cutts/dp/1788997425. I'm currently practising how to use raster calculator to find areas at ...
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Undevelopable land European Union [duplicate]

I would like to calculate how much of the land in the European Union exhibits slopes above a certain threshold (let's say 15%) in order to have a precise measure for undevelopable land. I'm working ...
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39 views

Enrich a featurecollection with more data

I have generated a vector feature collection which is great but I would like to add to this data before saving it out as a CSV. So the data is areas of forest loss in the county of Gwent and I want to ...
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72 views

Compute elevation and azimuth from lat, lon, and altitude

Given the latitude, longitude and altitude of two points (in my case satellite and ground antenna) I would like to compute the azimuth and elevation angle between the two points from the ground ...
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23 views

How to replace an ArcGIS elevation service with a GeoServer elevation service

I'm trying to remove a dependency on ArcGIS in our system and I'm trying to replace ArcGIS's ImageServer with a counterpart on GeoServer. Here's what I did so far: Downloaded a sample elevation ...
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1answer
25 views

Do elevation measurements differ between Coordinate Reference Systems? If so, can they be converted?

I have global elevation data captured in relation to the WGS84 ellipsoid, and a local elevation dataset which uses the OSGB 1936 CRS. Would one expect the values to be different, given that the two ...
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129 views

Assign elevation data to GPX from LIDAR data

I am totally new to this, so sorry for the basic question. I have some GPX files which have elevation data, but I am aiming for greater accuracy. Currently I have used OS benchmarks to correct the ...
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32 views

Adding elevation data to OSRM

I need to route heavy trucks using OSRM and I want to be able to take into consideration the elevation difference in a route in order to avoid steep climbs. How should I go about this? I tried ...
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43 views

Are WGS84 LatLon coordinates and EGM96 LatLon coordinates the same and difference for [LatLonEle] is elevation only?

Does WGS84 LatLon coordinates and EGM96 LatLon coordinates are the same? Is difference for [Lat;Lon;Ele] is in elevation only? If I have, for example, a [Lat;Lon] point in WGS84, I can take ...
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28 views

Error when converting contour.tif file to shapefiles using

I'm following the process in Contour relief maps using mapnik to insert contour data into a database. I've collected the data I require using the following bounds to create a .tif file: eio clip -o ...
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1answer
52 views

Getting elevation data from DEM

I'm trying to extract elevation data from a DEM file but I can't make it work. I want to extract contour lines from a given area, and label those lines with the proper elevation value. The problem I'...
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24 views

How to get elevation value in CSV format in R from raster SRTM DEM file?

I am trying to get elevation value in meter using R programming. I have loaded raster library in rstudio: elevation <- getData("alt", country = "BD") How I can get those value with lat lon? ...
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66 views

QGIS Wrong “ELEV” values from contour

My problem is that I'm trying to extract contours and elevations from a DEM map. Everything else looks fine, but I think that the "ELEV" values I'm getting are not the real elevations, maybe I'm ...
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39 views

How can I create GeoTIFFs from OS Terrain 50 data?

I'm playing around with R Rayshade, which creates lovely 3D terrain images using GeiTIFFs. I've been testing it out with SRTM 1 Arc-second images from USGS, but these are quite low resolution. OS ...
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1answer
145 views

Speed of reading a GeoTIFF using geotiff.js

I am have created my own API to return elevations from GeoTIFF files using geotiff.js (https://geotiffjs.github.io/), but it is slow compared to public APIs. For example, table below shows the tests ...
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Is there an API or Dataset for retrieving Lunar elevation from coordinate?

I'm looking for the "final" product, where the data available has been cleaned up and the data missing has been estimated. I tried using the Lunar Orbital Data Explorer set, but even with some ...
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67 views

Flow accumulation on grid in R

I would like to calculate the number of cells from gridded elevation data that drain into a particular cell. First, I calculate the flow direction by selecting the cell with the steepest slope from ...
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37 views

Define Terrain/Elevation textfile data format

I have a program that can visualize terrain/elevation data but will only recognize files in the below format. It has the extension .map but it is not recognized by QGIS or GDAL so I believe it may be ...
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1answer
57 views

Table of Latitude and Longitude with Associated Elevation

I need to create a table that allows me to retrieve the elevation value for a given GPS coordinate pair. Currently, I am just doing this for New Zealand. I'm working in QGIS using a GeoTIFF file, and ...
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1answer
17 views

What do the response values from ArcGIS Rest API Elevation Profile function represent?

So I am trying to use the ArcGIS API and asked it to profile a route between two lat/longs: (52.106505, 1.186008) (52.113621, 1.246862) My results are a series of points between the two and they ...
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23 views

Extract elevation profile for an existing polyline using ArcGIS API

We are trying to generate an elevation profile for an existing 3D line published in ArcGIS as a feature service and map service. We have followed below link: https://developers.arcgis.com/javascript/...
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1answer
47 views

Getting elevation of surface in a specific point from DEM?

In my python code, I have to get elevation of surface in given coordinates. I know about Extract values to points tool in ArcMap, but I can't use that since it is very time consuming for me because I ...
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1answer
44 views

Getting the raster file of elevation UK with 1 km grid?

I am trying to get raster file of elevation UK with 1 km grid? The EU-DEM has an elevation of 30 meters and 25-meter grids. I could not find any source for 1 km.
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1answer
107 views

Reading Elevation Data from a DSM file using Python

I am new to GIS processing and I have a DSM file with a .tif extension. I would like to read the elevation data from this file using python or QGIS. I can view this file on the delair web ...
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1answer
85 views

Changing elevation values of DEM

I am no expert in QGIS and I've already spend quite some time to find an answer to this, but I could not. Could anyone tell me how to change the elevation value of DEM? The one I have has been ...
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1answer
45 views

What is meaning of scale on x and y axis of image using matplotlib

I am finding elevation of a region using richdem. Can somebody tell me what is the meaning of the scale which is on the x and y axis of the image? import os import numpy as np import matplotlib ...
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1answer
64 views

Using DTED file as raster elevation source at ArcGIS SDK for Qt?

I am using ArcGIS SDK for Qt 100.7 for development and I was getting elevation from the code ArcGISTiledElevationSource* elevationSource = new ArcGISTiledElevationSource(QUrl("https://elevation3d....
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68 views

Align labels on a vertical line

I have a series of contour lines with relative elevations (Z value). I am trying to align the labels so that they are all on the same imaginary line. It's a process that I usually do with Autocad ...
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50 views

Why does no line appear when using Interpolate Line in ArcMap?

I'm attempting to make an elevation profile from a DEM in ArcMap using the Interpolate Line tool. I've done this before, and it has worked great--basically I just draw a line with Interpolate Line, ...
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34 views

Obtaining elevation data for each grid cell in raster image using QGIS

I am obtaining a raster image from the internet for elevation data. There are two-three files available for a single location : National Elevation Dataset 3 Meter, 1 map, National Elevation Dataset ...
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88 views

Getting elevation data or Z value of point using QGIS

I know that there is 3d drawing in QGIS. However, I want to learn that how it converts 2d map to 3d. Is there a way to get height value of points or does it convert longtitude, latitude to xyz ...
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53 views

Is there any elevation profile plugin working in MVC5?

I have MVC5 project where I use Mapbox maps to display hiking trails (based on geojson file). Lately, I decided to add elevation profile of these trails to the bottom of the map. However, thats easier ...

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