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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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Convert a RGB LiDAR raster image to a greyscale height map in QGIS [closed]

I am fairly new to the world of GIS and also using QGIS. I normally use a greyscale height map to create a 3D terrain in external 3D software. I have a location where I only have access to a RGB ...
Karen Gazzard's user avatar
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Google Earth Pro not saving elevations

I have terrain turned on, and tested all options for altitude but each time I save the track the elevation is set at zero. I simply use Notepad to examine the output file. Simple test to check what ...
J R Spigot's user avatar
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49 views

I need to simplify contour lines and find relevant spot elevations from a Raster in QGIS [closed]

I am trying to simply the contour line generated from a raster in the following manner: this image describes how the contour is simplified without cutting away from the terrain, only adding , like a ...
Enache Stefan's user avatar
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deck.gl GeoJSON point layer not extruding

I have a GeoJSON layer in deck.gl which I'm trying to extrude based on the elevation property. E.g. { "type": "Feature", "geometry": { ...
guest_231213's user avatar
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1 answer
28 views

Min/ Max Elevation per Polygon (Delaware)

I need to find the min/ max elevation per pressure zone (polygon layer). I'm struggling to find good input data - DEM or Elevation or... what should I use? Also, are there available tools in ArcGIS ...
CatchE's user avatar
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USGS slope less than 30° excluding water bodies (Earth Engine)

My goal is to get the land with less than 30deg of slope and exclude water bodies. The USGS/3DEP/10m dataset in Earth Engine produces a slope of 0 for water bodies (e.g. lakes, or ponds). I'm curious ...
bernatfortet's user avatar
1 vote
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112 views

How to get Orthometric (or geoid) Elevation in QField?

enter image description hereHow to get Orthometric (or geoid) Elevation in QField? Is it possible to import Geoid model in QGIS? Or calculate by some function? Because in QField I can only get ...
Jokubas's user avatar
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Raising/lowering extracted contour layer using QGIS

Is there a way to raise/lower an extracted contour layer? I've scoured the properties panel and have tried to raise/lower "elevation" menu, but when I make changes there nothing happens to ...
VSA's user avatar
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Elevation profile tool never "finishes", or creates the section?

I am struggling with the elevation profile tool in QGIS, trying to get it to "finish". I draw a line through my focus area, but no results appear in the section window. It should be noted ...
VSA's user avatar
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159 views

GRASS r.horizon returns nonsense

I am trying to calculate the horizon profile from a point on a mountainside, through the appropriate DTM elevation file and the GRASS function r.horizon.height (via QGIS). However, the output looks ...
elevation_modeller's user avatar
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Is it possible to request GML using WFS-T for ZM type geometry? (Point ZM, LineString ZM, Polygon ZM)

I'm a newbie here. I'm not sure whether my question is good or not... But, I want to ask something. To use Transactional Web Feature Service (WFS-T) to insert an object of a Point type, I sent a ...
janghs17's user avatar
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Satellite ground station site selection

I want to carry out suitability of a few identified Area of Interests to set up satellite ground station. The main requirement of the ground station is: it needs to have visibility above 10 degree ...
Cheki Dorji's user avatar
1 vote
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62 views

QGIS Elevation profile using Point Cloud and Polygon layer with Z value

I'm trying to use the Elevation profile tool with a point cloud and a polygon layer (with Z values). I wish to use the "capture curve" to view a section and I expected to see the polygon ...
nir 's user avatar
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1 vote
1 answer
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QGIS Map Atlas Expression - How to refer to atlas_pagenumber in an expression for elevation symbology

Can anyone point me to an example of how to refer to the current page number of QGIS Map Atlas layout within an expression for elevation symbology (which doesn't seem possible) or alternatively how to ...
dawrightau's user avatar
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151 views

When loading a DEM in Google Earth Engine, it doesn't load the full map extend

I want to download a digital elevation model for a major part of Europe. Last time I tried it with the "NASA NASADEM Digital Elevation 30m", wich can be found here: https://developers.google....
Mark's user avatar
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Implementation of below equation in jupyter or gee

Explanation for the equation: where A is the azimuth of the search direction, (xi , yi )are the coordinates of the cell of interest, and (xy , yy )are the set of all cell coordinates located along the ...
AAZIM YOUSUF's user avatar
2 votes
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Getting distance between DEM's zero elevation and earth's center [closed]

I'm using the DHM25 DEM available here: https://www.swisstopo.admin.ch/en/geodata/height/dhm25.html EPSG:21781+5728 (Swiss CH1903 / LV03 + LN02 height) I need to use the earth's radius under ...
fariadantes's user avatar
1 vote
0 answers
76 views

QGIS, metes and bounds, and elevation

I'm using QGIS and the azimuth and distance plugin to create features from metes and bounds descriptions found in old deed and land grant records. This is not forming closed polygons, I suspect due ...
L23's user avatar
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2 votes
1 answer
176 views

Generate shortest straight path between points and a given elevation in QGIS

I'm trying to do terrain analysis in QGIS. I have a vector layer with equally spaced points along a slope, and these points are somewhat parallel to the coastline of a fjord: I'm interested in ...
Will's user avatar
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159 views

How to interpret values of elevation standard deviation statistic (and not elevation mean) from DEM

I am trying to interpret the standard deviation of elevation to understand the topographic landform of my study area. We have 2km*2km grids in the study area for which we extracted certain landscape ...
RashmiSRana's user avatar
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30 views

QGIS update point location from NMEA

Can a point in a layer have its X, Y, and Z coordinates defined by a live NMEA string? What I'd like to have is a point that is constantly moving during an edit session based on the incoming GNSS ...
GISKon's user avatar
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60 views

How to detect the ridgeline of a gully with small scale data (>1m) in ArcGIS Pro

I'm having trouble finding the outline of a gully in my DEM with a very large resolution. I've tried the How to identify ridgelines from a DEM method but it does not work with my data, I presume ...
William's user avatar
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51 views

3D web map to QGIS

There is this 3D scan of Curitiba and I would like to know if there is a way to import the elevation data to QGIS. I’m looking to extract some elevation data of a specific area to make a physical ...
Leonardo Moreno's user avatar
4 votes
1 answer
144 views

Finding/highlighting significant elevation change

I am quite new to QGIS, so pardon if I use the wrong terminology etc. I am scouting terrain to find new bouldering/climbing locations. My goal is to find significant elevation differences and ...
exksalted's user avatar
1 vote
0 answers
88 views

Reclassify raster data based on specified values in a field

I am building a processing plugin that uses elevation values from a shapefile to reclassify a raster data file. Desired Table Group Condition A: every unique value is treated as a group, and assign ...
Beginner's user avatar
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65 views

Set elevation profile to CSV on ArcGIS Pro 3.x

I want to export my elevation profile analysis from ArcGIS Pro to CSV. I am able to export it, but it seems that I cannot edit the interval of elevation values exported to CSV. I want to have an ...
mtzendy's user avatar
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89 views

Resolution (?) changes when zooming in local scene ArcGIS Pro

I've made a polygon feature with varying Z-values on the different vertices. It's based on sea level changes in different areas, and I intend to display elevated shorelines in a larger region. The ...
skuol's user avatar
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2 votes
1 answer
207 views

Problem with creating elevation cross sections using R and terra

The terra::extract function samples raster data from the top to the bottom and from left to right. This creates an issue if you're using a line to sample a raster with plan of plotting the data as a ...
Adam C's user avatar
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1 vote
0 answers
114 views

Calculate height of point on line in an elevation profile

I have a line of an elevation profile and a ground layer below it. Is there a possibility to get the height above ground for every position (not waypoint) on the line? My height profile in the built-...
qgisAsker082018's user avatar
2 votes
1 answer
60 views

Filtering elevation changes in time on a point layer in QGIS

I have a point layer extracted from a GPX file that contains a series of points representing elevation and time, as on the following image: This huge amount of points means that, in many cases, the ...
Trikelians's user avatar
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0 answers
35 views

Colour interpretation on ASTER GDEM files

I'm trying to understand the data in both the grayscale and colorized versions of the GDEM samples provided here: https://asterweb.jpl.nasa.gov/gdem.asp I haven't found (looked hard enough) a ...
FleetMüller's user avatar
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0 answers
34 views

Height profile ArcGIS in wrong order

I am creating an experience in ArcGIS Online with GPX data. As input I am using the shapefile of the polyline of the track. When this track is represented on the elevation profile, it puts the ...
Jane's user avatar
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0 votes
1 answer
222 views

Create an interactive elevation map starting from GPX files in ArcGIS Online [closed]

I just went on a trip and have GPX files of my hikes. Along with that I have "tracks" (without elevation data) and "track points" located on the same route but with elevation data. ...
Jane's user avatar
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0 votes
1 answer
446 views

Calculating highest elevation within drawn circle using Google Earth

I understand that you can obtain an elevation profile for path & line measures, and you can also do this for a circle's circumference. However, is it possible to obtain the highest elevation point ...
John Campbell's user avatar
2 votes
1 answer
92 views

Switch begin and endpoint in profile graph - ArcGIS Pro

I created a profile graph in ArcGIS Pro. The TIF file that I use to create the profile, via the function "Interpolate Shape", contains the elevation in Europe. The line that I created starts ...
Foeke Boersma's user avatar
0 votes
2 answers
305 views

Trying to get topography via elevation package Python

So I'm trying to get some topography. In Detail some parts of the panama canal. I tried using the elevation python package. Here is my code so far: import elevation min_lat, max_lat = 8.0, 9.5 ...
schobbe's user avatar
-1 votes
1 answer
67 views

Changing Font Size of QGIS Profile Tool Plugin

I have used this plugin often in the past but always wished to enlarge the font size on the graph scale, and make it darker. Does anyone know how to tweak the code to do this or suggest another way in ...
Dan R's user avatar
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1 vote
1 answer
489 views

How to extract elevation using contours in Google Earth Engine?

I want to extract the elevation values and generate contour lines from SRTM DEM at a 100 m intervals. However, I was able to create the contour lines using a code available here. But I am not able to ...
CESCRA IARI's user avatar
1 vote
1 answer
202 views

geotiff.js - Elevation at point in DEM raster seems to be null or zero

When reading COG (Cloud Optimized GeoTIFF) or original GeoTIFF of a DEM/DTM (elevation map) file using Geotiff.js directly or geoblaze, elevation at a point through conversion of coordinates to pixels,...
Michael Jernil's user avatar
0 votes
1 answer
460 views

Google Earth Engine - slope

I am trying to use the pre-built function of GEE for calculating the slope of the terrain, but I cannot really understand how the function works, since the documentation is also not really helpful. ...
Gaiagruu's user avatar
2 votes
0 answers
175 views

Algorithm for calculating line of sight [closed]

I've been working on implementing a Line of Sight calculation tool, but the results often appear incorrect. I am unable to use other libraries or tools to do the calculations, so please do not ...
Acorn's user avatar
  • 129
4 votes
1 answer
468 views

Creating color physical map using SRTM V2 GeoTIFF tiles in QGIS

Trying to make a physical map (don't pay attention to the colors, I'm experimenting). The map is based on DEM SRTM V2. But I have experienced some trouble with making a smooth transition between ...
GeoEth's user avatar
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0 votes
1 answer
103 views

Exporting binary file from Google Earth Engine

For a hobby flight simulator C++ project, satellite RGB and elevation data is needed. Since a few days I am trying Google Earth Engine. It is amazing at showing the data as a map. I see GeoTIFF export ...
Merlijn Janssen's user avatar
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1 answer
399 views

Which online APIs return elevation data without the height of trees and buildings?

I work on applications that generate topographic maps and analyze GPS tracks. My main concern is the presence of "bumps" due to the height of trees and buildings returned by the elevation ...
Guillaume's user avatar
1 vote
0 answers
173 views

Convert unit vector from body to ECEF coordinate system

I have an Android phone using local coordinate system as shown on the picture: "Азимут" is azimuth. "Угол места" is elevation. "Крен" is roll. Azimuth is measured from ...
Maxim's user avatar
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3 votes
1 answer
410 views

Calculating slope using the 3*3 window approach for elevation data

I have some DEM grid data (25x25, 625 pixels) and I am trying to figure out the correct formula for calculating slope for each pixel. Some googling gave me a bunch of different formulas, but I've ...
frodolicious's user avatar
0 votes
0 answers
189 views

QGIS z value, MSL vs HAE

I have been using Qfield to collect field locations (x,y & z) with a GNSS receiver. I can correct for the antennae height within the app (trimble mobile manager), so that that when QGIS records ...
JP2-squared's user avatar
0 votes
0 answers
76 views

Get elevation from multiband GeoTIFF

I got this multi-band GeoTIFF from a government agency explicitly mentioning it referred to elevation in meters. But how do I combine the values of each band pixel into the elevation? What's the ...
João Pimentel Ferreira's user avatar
1 vote
0 answers
123 views

Creating a heightmap from hillshade/radar data?

So there are several threads explaining how to create a hillshade map from DEM. Does anyone know of a method to do the opposite? Essentially all I have is unidirectional radar data which functions ...
Ike Fardy's user avatar
1 vote
2 answers
213 views

Error: Computed value is too large, while trying to extract all the elevation values in GEE

I am trying to extract all the elevation values of a region using the NASA SRTM Digital Elevation 30m data set as a CSV file. But it is showing the error FeatureCollection (Error)Computed value is too ...
nawra parveen's user avatar

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