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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10 views

Adding F_ZLEV and T_ZLEV to road network - do I make all ground roads 0?

I am trying to create a network dataset from TIGER for a very small city. Of course there is no elevation/Z data. I am watching a tutorial that shows how to add Z values (1 for bridge, 0 for ground, -...
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31 views

Calculation of elevation data from raster file(.Tiff) in QGIS

I am trying to find elevation data of a particular coordinate(lat/long) from a raster file(EPSG:4326) using QGIS C++ APIs. I am able to render a raster file on QgsMapCanvas, which means GDAL is ...
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Depth level GeoServer

I have a NetCDF file containing 5 depth levels of a sea area. On my GeoServer I've enabled the elevation property and The getCapabilities function returns this information: <Dimension name="...
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ArcGIS ElevationSync no longer working?

I was using the ArcGIS REST elevation for a year or longer. However it stopped working, giving http 400 responses. According to documentation nothing changed. Anybody had a same issue or some further ...
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44 views

Detecting cliffs higher than X meters from DEM

Using QGIS, and the 'Raster > Analysis > Slope' tool, I could easily detect cliffs from my DEM. I can identify all cliffs, and can color areas where slope is above a certain threshold. Since ...
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20 views

Open-Elevation API Accuracy

How accurate is the Open-Elevation API? I'm trying to follow this example (except with s=1000 to get high-accuracy data), and get the following elevation profile: However, using Google Earth Pro, I ...
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Seeking Elevation Data [migrated]

I'm trying to get elevation data and I have no idea where to look. I'm basically trying to get where land is above a certain elevation. I'm primarily concerned with where land is above X' in ...
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How can I define a threshold or outlier for the elevation difference between two different time period taken in rock, that should be zero?

I am doing the geodetic mass balance of a glacier and I have the elevation difference that was produced in the glacier, but now I have to correct this data but making the mean of the elevation ...
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58 views

Extracting specified elevation value from mid point of valley along cross section based on DEM using ArcMap

I am using ArcMap. I need to extract the intersection point of the cross section line (blue line) where it intersect with the height variation value of 5m in both sides of the section from the mid ...
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1answer
68 views

How to use contours to create polygons around hills? [closed]

I have a shapefile with contours for a Brazilian state. The contours give me the elevation across that particular state. My goal is to use the contours to identify hills. Ultimately, I would like to ...
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Spheroid Flattening Impact on Elevation

I am importing points containing elevation from a survey controller into a GIS. The survey template on the controller contains a projection using a HT2 Geoid model, in NAD 83 Canada UTM. I can match ...
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Swath profile plugin

im trying to install the toolbox Swath profile, but the program send me an error "NameError: name 'Line_shapefile' is not defined". How can i install it?
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How to request GeoServer elevation data from GeoServer to PNG file with the minimum loss of precision

I'm requesting alt data on GeoServer from a layer group as a PNG file. The colormap of the style associated with the layer is the following : <ColorMap> <ColorMapEntry color="#...
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42 views

Seeking tool to generate topographic profile from points

I'm trying to generate a topographic profile, but not the typical terrain profile. To do this, I generate a grid of points uniformly distributed on a surface of a DEM. From these points (from which I ...
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Merge raster data

I merged four rasters using raster>miscellaneous> merge. (I did not specify any not data values. and it is set as 'Not set'). When I check my four separate rasters, elevation ranges are -6.6 to ...
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How to get elevation raster data at custom scales for a specific region?

I'm new to GIS and trying to obtain elevation data for a specific region, transformed to raster data with a custom cell size of 10 meters. My first attempt was to download a TBDEM dataset from USGS ...
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1answer
43 views

Manually changing elevation data of DEM using QGIS [duplicate]

I'm looking to do personal modifications to a DEM (Aster global elevation model). I want to select an rectangular area & reduce its recorded elevation by 20m. There are other parts on my map I ...
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32 views

Calculating height in raster layer pixel wise using QGIS C++ API

I am making a custom QT application using QGIS 3.14 C++ APIs. I am able to render a raster input file(.Tiff). But sometimes Raster file can be of DTED type(with .tiff extension)(DTED file). How can I ...
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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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1answer
99 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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1answer
70 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
67 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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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
85 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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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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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
68 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
44 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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1answer
34 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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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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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
28 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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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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55 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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94 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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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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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
36 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
77 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
90 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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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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2answers
58 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
36 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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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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0answers
50 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
114 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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