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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13 views
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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1answer
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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1answer
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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45 views
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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2answers
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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1answer
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 ...
2
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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
...
2
votes
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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1answer
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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0answers
44 views
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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1answer
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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1answer
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 ...
0
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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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1answer
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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0answers
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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0answers
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 ...
0
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1answer
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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2answers
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
...
2
votes
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 ...
0
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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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0answers
19 views
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 ...
3
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1answer
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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1answer
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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2answers
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?
0
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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/...
2
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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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0answers
44 views
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 ...
2
votes
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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0answers
29 views
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 ...
0
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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'...
2
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0answers
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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0answers
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 ...
0
votes
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 ...
1
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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 ...
