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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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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26 views

EA DTM - profile tool Y axis scale

I am using EA DTM squares as input layers into the profile tool. I have created a polyline and am using this as selection layer. A profile shape is correctly created. The X axis is in meters and ...
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Elevation profile add-in for ArcGIS not producing graph

I am trying to create an elevation profile graph using a river line shapefile and the add-in (with ArcMap 10.4.1). So I select my feature, click the "Create a profile for the selected feature" ("...
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25 views

Seeing heights in Landsat 8

I have downloaded some DEM from Landsat 8 from usgs website. when I opened the compressed file I saw some Tiff files and two text files. I opened the txt file using ArcGIS 10.7 and it contains many ...
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19 views

Using HEC-Geo RAS

i have got some weird problems with HEC-RAS 5.0.7. and i dont know why. Actually the heihgts are complety wrong. My terrain heights are rigth but for example my cutlines are completly useless. My OS ...
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Can Elevation Layers in WCS be Combined?

Some weeks ago, I began an effort at my company that required me to delve into the world of GIS. I've learned a lot since then, but there is one thing I'm not entirely clear on: is there is a way to ...
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26 views

Elevation profile for MultilineString (Shapefile) in QGIS

Is there a way to create elevation profile for multilines? I tried to use many methods like r.profile and plugins like Profile Tool, qProf and DataPlotly but it did not work as expected. These works ...
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81 views

Obtaining elevation data for points using QGIS [closed]

I am new to QGIS. I have points uploaded to QGIS that were collected from a GPS, and I need to get elevations for each point (I don't trust the elevation estimations of my GPS). What is the best ...
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48 views

Is there a tile server for DEM data?

I'm new to GIS and I'm using QGIS 3.4.5. I've been downloading individual SRTM tiles containing DEM data and merging them together in order to see the elevation of every point in a given area (such as ...
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9 views

Add elevation to contour vectors using sequential numbering by drawing a line

I have several contour lines and I want to add the elevation as attribute. I found a tool in ArcGis Pro that would do exactly what I need, select the contours with a line, specify the starting value ...
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1answer
76 views

Line of Sight between sets of two points each

So I have a list of points with their longitude and latitude (Lon_A, Lat_A and Lon_B, Lat_B). I also have a DEM layer from the SRTM for the relevant location. I need to check if line of sight exists ...
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1answer
56 views

How accurate are Ordnance Survey MasterMap topography spot heights?

The spot heights in the Ordnance Survey MasterMap sample data over Exeter with feature code 15404 are presented as an integer value in metres. But how accurate are these spot heights? I had assumed ...
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49 views

WSG84, GPS, GEOID and other altitudes

INTRO A bit of tool introduction, but the problem is not related to this directly. I have an app in CesiumJS. I am using Cesium World Terrain, and get altitude using Sample Terrain Most Detailed ...
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1answer
93 views

How to digitize a feature to include elevation data and interpolate slope in QGIS

I would like to take this archaeological drawing and use QGIS to create a something similar to a DEM or TIN, so that depth/elevation values can be quickly and clearly understood. I do not know what ...
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29 views

How to normalize elevation of GeoTIFF file data stored as unsigned integers?

I have a GeoTIFF file where the pixels are stored as unsigned 16 bit integers. I am using C# Gdal bindings to read the GeoTIFF file, using the Band.ReadRaster method, in order to produce an array of ...
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Effectively applying cpt-city colour ramps to elevation in QGIS3

There are lots of nice topography and bathymetry colour ramps provided by cpt-city in QGIS. However, I cannot find a straightforward way of specifying the transition from blue (below sea level) to ...
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48 views

How to find elevation profile or elevation changes between two GPS coordinates?

I have GPS coordinates of two locations namely A and B. If I have a great circle path or straight line path between these two locations A and B, I need data of how the elevation changes along the path ...
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124 views

Python: Convert DEM to 3D array organized as [lat, long, elevation]

I'm trying to convert a .tiff DEM to a numpy array using python. Ideally the array will store latitude, longitude (or some coordinate alternative), elevation). I'm using Gdal but currently it only ...
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21 views

Converting Historic Elevation into a TIFF or DEM file for 3D mapping

I am working on a project that shows the development and geological changes to a stretch of coastline around St. Augustine, FL over the past 160 years. I hope to create a series of map scenes that ...
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33 views

How do I add elevation data to a shapefile in the attributes table?

I'm using ArcGIS to create a DEM/DTM for a viewshed analysis. I have an existing DTM created from UK OS Terrain 5. I'm attempting to add the elevation data to the UK OS Open Map shapefiles for ...
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1answer
28 views

Adding building/woodland elevation data to existing OS Terrain 5 DTM in ArcGIS Desktop [closed]

Would someone be able to give me the stepped process showing how to add building/woodland elevations to an existing DTM raster in ArcMap? I seek this in order to prepare a surface model for a ...
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18 views

Problem with weird values in DTM and not showing correct elevation

I am still new to Gis and don't know if I understand what is wrong. I am working in a ocean survey program with point clouds. As seen on the picture the minimum depth is 1,92 and maximum 12,02. I ...
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62 views

filterBounds() error in Google Earth Engine

I wanted to clip the ALOS elevation model to an ROI. This is the code I wrote. var dem = ee.Image("JAXA/ALOS/AW3D30_V1_1"); var geometry = /* color: #ffc82d */ /* displayProperties: [ {...
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1answer
56 views

Points along lines at set elevation intervals [closed]

I am looking for a way to create points along lines (roads) at set elevation differences (0.5m height differences) using QGIS.
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1answer
36 views

Exporting masked image?

In this script, I take an image and mask off everything below certain elevation. The result looks really interesting as one can still see the names of the towns and roads where the image is masked ...
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38 views

DSM - DTM = -ve value

I want to calculate the elevation of a particular feature. I have both DSM and DTM as input data, both with the same cell size and same number of columns and rows (same resolution). For the DSM, min = ...
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39 views

Reading ushort and uint data using gdal C# Band.ReadRaster method

I am using C# bindings for gdal in order to get elevation data from GeoTIFF files. The API contains a Band.ReadRaster method. This method supports a lot of data types, but for reading unsigned ...
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36 views

Getting Elevation Data for Elevation Attribute using ArcGIS Pro

In ArcGIS Pro, how can I insert the elevation data into an attribute table? There is already an elevation field created, and the feature class is set to where all features are on the ground, so you ...
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161 views

How to exaggerate the elevation in QGIS 3.6?

I´m using QGIS 3.6 to create a Thematic Map with a basemap (STRM). So, to do that, I downloaded the STRM file (*.TIF) in this site: https://earthexplorer.usgs.gov/ File Name: s11_e040_1arc_v3 ...
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2answers
48 views

Why does Blender not accept DT2 file (elevation data from EarthExplorer)?

Trying to do the Creating Shaded Relief in Blender tutorial https://somethingaboutmaps.wordpress.com/2017/11/16/creating-shaded-relief-in-blender/ Got the file from SRTM 1 Arc-Second Global. Got ...
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1answer
60 views

Selecting coordinates of points below DEM (DTM)

I have a DEM file and a big list of X,Y,Z point (about 1M). Each of them can be below or above the DEM file. Is there a quick way to select the x,y,z points below the DEM file using Python? I did ...
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Extracting relevant data from CAD format into a PostgreSQL database

I have received some survey information in the format of a .DWG (AutoCAD file) and I am trying to extract the data from this file into QGIS and then into a PostgreSQL database. In the .DWG file there ...
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116 views

What are the X Units for an elevation profile and how can I change them to meters?

The question: How do I get a simple elevation profile for a line using QGIS 3.4 with height/distance in either meters or feet? The problem: I have the same problem using both Profile Tool and qProf ...
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1answer
21 views

Quality of SRTM 4.1 vs 2.5

In recent years I have used this source https://dds.cr.usgs.gov/srtm/version2_1/SRTM3/ to retrieve elevation data from files in .hgt format. The problem is that these data have holes, so I'm looking ...
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34 views

Stripes in TPI from SRTM 30 DEM

The TPI is calculated with a 150 to 300m annulus in Google Earth Engine. The underlying Elevation-Data from SRTM does not show such striped. I did use raw SRTM from GEE for elevation, no reprojecting ...
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44 views

How to obtain elevation info from VRT file?

I have a VRT mosaic file I made from thousands of ESRI GRID files. It looks something like this. <VRTDataset rasterXSize="111831" rasterYSize="94785"> <SRS dataAxisToSRSAxisMapping="1,2"&...
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42 views

Android app to get altitude of places to use in field visit?

I want to verify the height of the ground which is provided to me with the help of an app if available. Of course, I am aware an app will not give me exact value but for me, it works if it shows ...
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1answer
251 views

Creating elevation profile using ArcGIS Pro?

I have one road shapfile and one raster which has surface information How can I combine them and create elevation profile?
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1answer
23 views

Stack for creation local shaded elevation tiles

I wish to create a local osm tiles with elevation information. I wish to display elevation info like a contour lines and shaded places linked with contour line values. I know about this source/...
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1answer
105 views

Elevation Profiles Using QGIS vs. Google Earth

I have several routes I am calculating elevation stats for. What I want is Total Ascent/Cumulative Gain, where all ascents and descents are accounted for. As opposed to solely the difference between ...
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Cross section profile distance not providing accurate distances?

I have created a DEM file, which I am using to draw a cross section along a line to see the variation of height from point A to point B along land seen below. When it use the Profile tool on the ...
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1answer
58 views

Getting startAsciiWriting (x, filename, …) error in R?

I am new to R. I am trying to transform elevation data in R for input into MaxEnt. Returned: Error in .startAsciiwriting (x,filename ...): x has unequal horizontal and vertical resolutions. Such ...
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Combining/getting elevations from .asc files or .tiff with x and y locations [closed]

I am new to R and still getting to know the environment. I am doing a project in animal movement. I have x and y locations (plus IDs, dates, hours) in an Excel table, converted into .csv as well. I ...
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1answer
77 views

Finding lowest elevation in multiple polygons using DEM? [closed]

I have a polygon layer with six polygons. I need to have the lowest elevation point in each polygon using a DEM. The following explanation https://support.esri.com/en/technical-article/000011761 (...
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1answer
302 views

WGS84 to MSL and opposite

I am using CesiumJS to create point in a map using World Terrain to get the elevation of my points. The point in Cesium are using WSG84. When I calculate the altitude using sampleTerrain I retrieve ...
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2answers
97 views

Substracting raster values from 2 rasters with different cell sizes

I am working with two raster files. The first is a DEM and the second an elevation-correction file. Both files display the same geographic region. My problem is that the cell sizes of both files aren'...
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48 views

HGT Elevation vs Calculated Elevation

I wondering how to interpret the elevation calculation. Per example. We are in Canada and I use SRTM3 files. I use the GDAL library to extract my elevation, everyting is ok, except: Why (or how) the ...
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21 views

Elevation Map from Slope and Aspect Rasters

I am trying to create an elevation map (e.g., recreate a DEM) from the following input data: Slope Raster Aspect Raster ASCII file containing XYZ data points (Easting, Northing, and Elevation for ...
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1answer
173 views

Reading in AW3D30 GeoTIFF files and processing them in Python?

I am new to GIS processing, and I am using Python 3.6 to do so. My current task is to read in several files of geographic data (specifically tiles of elevation data from JAXA), combine them for my ...
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2answers
66 views

Lunar DEM elevation data scaled by 2

I am working with a DEM of the lunar south pole in QGIS. I have currently set the projection to "no projection", or Cartesian co-ordinates (origin at the pole). The horizontal locations of features ...