Geographic Information Systems

Questions tagged [elevation]

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

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Query pixel value at specific location using arcgis image service?

I am interested in USGS elevation and slope data and I found arcgis service that serves this data. I want to query elevation or slope data at specific location using arcgis image server, so that data ...
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43 views

How to calculate elevation angle between two GPS coordinates?

I have two gps coordinate points (longtitude,latitude, altitude). Within range of 1 or 2 km. I would like to know if it is possible to calculate the elevation angle between these 2 points. simple tan ...
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Select first valid datasource in VRT

When reading data from a VRT, gdal appears to interpolate values from all available rasters. Is there a way to configure the VRT in such a way that it selects the first valid raster in the dataset, or ...
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61 views

Creating line that follows lowest elevation on contour map in QGIS

I have a shapefile of contours that I generated from LiDAR data on QGIS. I'm trying to create a line that follows the lowest point of elevation across the entire map that follows a ditch (it's a long ...
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1answer
63 views

Elevation data for settlements

I'm new to QGIS, and I'm trying to plot settlements on a map with their elevation data (using Openstreetmap). Problem is, I find most of the villages/ towns have their 'ele' data missing in the ...
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102 views

Extract morphologic characteristics of mountains from DTM in QGIS

I'm looking for some algorithm/script that allows the automatic extraction of peaks from DTMs into a point shapefile (including their morphologic characteristics such as key col, prominence, and ...
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1answer
41 views

Get elevation for multiple lon and lat using Earth Engine in Python [closed]

I'm new at Google Earth Engine and I need it for one simple task for research purposes, I have a list of nodes like this node1:[lon,lat] node2:[lon,lat] node3:[lon,lat] I would like to get the ...
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2answers
36 views

Populate Elevation Data in GPX using FME

New to FME, and I have now spent more time than I would like to admit on this and need some pointers. I have a GPX file that was made from a Shapefile. It has no elevation data. I have the Terrain50 ...
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25 views

Using Python to return elevation at arbitrary XY, from contour vector file [closed]

I want to write a Python3 script to calculate the elevation difference between a 3D surface (supplied as a DXF of contours) and a long list of XYZ coordinates (supplied as a CSV). The script should ...
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1answer
54 views

Merge Contour Boundary for Polygons QGIS

Hoping this is fairly simple but haven't been able to find much online. I am trying to create some elevation polygons from a DEM model. Right now I am getting this after getting the contours, ...
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Geotiff files - Zoom into a specific zipcode/latlong/apn

I am new to Geo tools. I am trying to assess the DSM/DEM of buildings in specific cities. So far, I could obtain a geotiff file from https://earthexplorer.usgs.gov/ and plot maps of the entire earth ...
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1answer
34 views

What algorithms can be used to create a DTM from a DSM TIFF file i.e that will reduce or exclude features such as trees and buildings

I am using Python and QGIS. I have obtained - purchased - a 1m DSM photogrammetry data file - a TIFF. I could purchase a DTM from the same company, but they are 5m grid, and so they lose some data I ...
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27 views

Importing a simple elevation raster to ArcGIS Online

I have a very simple elevation raster that I want to bring in to AGOL for use in a web map or web scene. I need to preserve the elevation data. I have tried to bring it in as a tile service but I lose ...
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1answer
33 views

Generating extent of 1 ft rise in floodplain using ArcMap

I have a polygon layer that represents the max inundation extent along a stream for the one-year storm event (generated in hec ras). If this floodplain was theoretically raised by one foot, what would ...
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25 views

Contour lines from AutoCAD to QGIS: how to automatically assign the right value to the Z

I have a plate of contour lines made on AutoCAD (contour lines do not have a Z). The Z is indicated only for some curves but in a text format. If you import the table in QGIS the situation is this (...
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1answer
25 views

Change pixel values of the open Sea to noData values

I want to calculate, which land areas of my elevation raster data set are under a specific elevation height. The open sea with pixel values of 0 should not be included in the analysis. I want to ...
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28 views

How to calculate the slope of my polygons using DEM

I downloaded elevation data (DEM) of my study area from NASA and I converted it to slope. How do I calculate the slope of each farm at my study area? I have a shapefile containing the polygons of the ...
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45 views

Simplify/generalize vector geometry with side bias

I have contour polygons as vector geometry with attached elevation attributes. Is there a method to simplify vector polygons while preserving topology and elevation bias? By elevation bias I mean that ...
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59 views

Making profile graph in ArcGIS Pro with 2 Rasters

I am trying to compare 2 bathymetric elevation rasters collected using different methods. I am using ArcGIS Pro 2.5.2 and I have 3D and spatial analyst extensions. All data is in WGS 1984. I have ...
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40 views

Interpolating Z at polyline vertices between known Zs

I have polyline strings with vertices of known elevation / z height and intermediate vertices with null/zero height. Known Zs are spread throughout the line. I'd like to be able to populate the z of ...
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109 views

Flatten/smooth/reduce noise in SRTM elevation maps

Is it possible to "flatten" some areas in an elevation map using GRASS? For example I have an elevation map of Iraq. I'd like to smooth out the mostly flat areas while still keeping things ...
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1answer
33 views

Raster Images in Python to be ported to Swift in the future [closed]

I am working with a grey scale image from a DEM. No matter how much Googling or reading I do I can NOT find a solution for Getting elevation values from a raster images pixels. It should be as simple ...
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1answer
58 views

QGIS Raster layer query elevation at point

In QGIS 3.14 I try to get elevation data from denmarks elevation model using "kortforsyrningen" plugin. The elevation model (layer name = 'DHM/Terræn') is added as a raster layer (...
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1answer
65 views

How to query elevation data from “Digitales Geländemodell (DGM) NRW”, maybe using WCS?

I use street network data originating from OpenStreetMap, stored in PostGIS, and want to add corresponding height/elevation data from "Digitales Geländemodell (DGM)", available for North ...
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89 views

Cesium Terrain generated using DSM is way higher than the base map

Is there any way I can clamp the terrain to the base-map's height? Is the problem with the vertical datum for the data. I tried changing ellipsoid's radius-- but I learnt that the height is relative ...
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38 views

Getting characteristic high points from DEM

I use QGIS 3.14 and I have a DEM file which I'd like to use to get a point layer with most characteristic high points from that DEM. So every top of the mountain, hill, hillock, low etc should be ...
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51 views

Including elevation information while temperature interpolation

I am working on ArcMap 10.5 for temperature interpolation. I am using IDW for interpolation. I need to compare the results with and without elevation data. However, I am unable to understand how to ...
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1answer
34 views

Elevation lines label positions (select manually?) in QGIS

I have a layer of elevation lines in QGIS. Now I want to create a map that shows a certain extent of this layer and shows the labels for certain lines (ideally once for every line). So far, this isn't ...
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2answers
31 views

I need to export DXFs with a certain Z value

How do I do that? Right now it says it's including a Z dimension but I don't know where to input it.
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15 views

Create a histogram from a raster with no attribute table

I converted an ASCII file to a raster. I had to use the float raster because it is continuous elevation data so there is no attribute table. I need to make a histogram in GIS of the elevations to ...
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45 views

Why measure height relative to geoid instead of ellipsoid?

Why do we measure elevation relative to sea level? I understand that water settles to a level surface, but why not just measure relative to an ellipsoid and dodge all the sea level rising, geoid, and ...
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1answer
92 views

Extract elevation by longitude and latitude

I have a large file of coordinates on the map of New Zealand, by longitude latitude. I want to find the approximate elevation at each point. Starting with just one area, I have found a raster with the ...
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2answers
331 views

Elevation Profile with labels on waypoints (QGIS, Python)

I would like to plot many elevation profiles with labels on specific waypoints (Points of Interest). In the end it should look like this: Or like here: https://www.birdandhike.com/Hike/Mt_Char/...
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1answer
134 views

Interpolate drawn line in Leaflet

Is it possible to interpolate points between multiple points on a drawn line in leaflet? I am creating a site where users can draw running routes and see an elevation chart, but currently only where ...
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1answer
38 views

How could I classify every county in this US as flat, hilly, or moderate? [duplicate]

I'm looking for a VERY rough label for every county, so low-res data is fine here. Is there data on existing elevation change per county? Or should I get an elevation layer of the US and do a zonal ...
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1answer
32 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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1answer
49 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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78 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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1answer
116 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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71 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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91 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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1answer
81 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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122 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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183 views

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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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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1answer
42 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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13 views

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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123 views

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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1answer
55 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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146 views

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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