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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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26 views

What does “Pixel Value” mean? And the formula will lead to a single value, how would I then adjust Min and Max of my elevation file? [on hold]

This is the Min and Max of my elevation file https://i.imgur.com/rcQMXVo.png I'm doing somethingaboutmaps.com's "Creating Shaded Relief in Blender" https://somethingaboutmaps.wordpress.com/blender-...
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16 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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22 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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11 views

How to read 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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1answer
19 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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122 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
27 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
33 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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14 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 ...
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1answer
69 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
16 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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22 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
38 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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37 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
76 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
18 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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77 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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34 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 ...
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1answer
39 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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28 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 ...
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1answer
62 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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2answers
57 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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28 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
84 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
56 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 ...
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1answer
32 views

Calculating elevation at point on line using ArcGIS Pro?

I have two line layers showing stormwater and sanitary sewer pipes. The attribute tables for both layers show elevations for the upstream and downstream ends of each pipe. I have a point layer ...
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64 views

Filling in holes in heightmap with lower resolution heightmaps?

I have this elevation map of the Verdal area in Norway, from the Norwegian mapping authority. The first one has a 1m resolution, but has some holes in the data. I'd like to fill in those holes with ...
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1answer
50 views

Downloading digital elevation model of United States?

I would like to download a digital elevation model of the United States, where can I do this? It doesn't need to be super detailed. But it would be nice, if was clipped at the country borders – ...
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1answer
210 views

Importing elevation data into prexisting KML in Google Earth Pro?

I am working on a project where I need the z value (elevation) of a set of data points. Is there a way to assign elevation data to a KML in Google Earth without doing it manually for each point? I ...
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1answer
29 views

ArcGIS REST API ElevationSync result is empty?

I would like to use the ArcGIS REST elevation service. Providing a list of locations I would like to receive a list of elevations relative to these locations. After some struggling with the syntax I ...
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1answer
35 views

Image Overlay 3D Adapt in Google Earth

When adding an image overlay (specifically a GeoTiff exported from QGIS), the image looks great until you turn on 3D buildings or terrain. These features pop through the image overlay, and disrupt the ...
3
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1answer
44 views

How do I bring the Z value to attribute table?

I have a shapefile exported from a hydraulics software that I use. The file is exported as polylines. I convert it to a point layer using the "Extract Nodes" function. The remaining piece of ...
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1answer
69 views

User-Scaled Color Relief Map to Google Earth from DTM

I have a DTM file, and my goal is to load it up onto Google Earth as a color relief map, with the colors gradient at levels I chose. I have successfully done this with RAS MAP using HEC RAS software, ...
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112 views

How to plot elevation charts from a GPX file that has elevation data

Is there a service or package that converts a GPX file into an elevation chart? I need either a CLI, a Web API, or a library/other software that could be wrapped up as a small service. The GPX ...
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33 views

Getting elevation value of point from TIFF Image in GeoTrellis

val path: String = "data/imgn19w065_13_geotiff.tif" val geoTiff: SinglebandGeoTiff = GeoTiffReader.readSingleband(path) val point : Point = Point.apply( -64.858043,18.332479); How I can read the ...
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45 views

Combining Bathymetric and Elevation Data using R?

Here is some elevation data of some islands. I wish to add depth info to the water. With the generous help of @Spacedman at Overlaying elevation data and bathymetry data in R? I get: To resolve the ...
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1answer
64 views

Overlaying elevation data and bathymetry data in R?

I have two layers that cover approximately, but not exactly, the same area. One is land elevation of some islands. The other is the depth of the water around the islands. I can resolve the vertical ...
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2answers
101 views

Adding elevation to point in PyQGIS?

I am trying to add elevation to a 2D point in a QGIS 3 plugin, preferably in a concise and straightforward way. Not finding this easy. I think part of the problem is that in QGIS 3, fromPoint() has ...
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1answer
313 views

How do I add elevation data to my layer

I have a layer showing elevation curves and I'm trying to create an elevation profile using the Terrain Profile plugin. However, I only get a flat line. My guess is that I need to add Z values to the ...
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40 views

How to open G.L.O.B.E. DEM files from NOAA

I need to open a free GLOBE DEM. I have downloaded some tiles from: https://www.ngdc.noaa.gov/mgg/topo/gltiles.html, but I don't know which software should I use in order to open those files. Is ...
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20 views

Fetching elevation of one point from MapQuest API in Leaflet

I am trying to get elevation of clicked location via fetching elevation values from MapQuest elevation profile API https://developer.mapquest.com/documentation/open/elevation-api/elevation-profile/...
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1answer
163 views

GIS dataset with latitude, longitude, and elevation

Websites such as this one: https://gisgeography.com/best-free-gis-data-sources-raster-vector/ have many references to elevation data. They are all in *.jpg or other image format, however. What I need ...
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19 views

Where do I find the date for a specific NED raster?

I am looking at stream height and flooding. As there are seasonal differences in flood severity, knowing what month or general time of year of the image(s) is essential. I downloaded a 3m National ...
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24 views

New York buildings - XYZ altitude map

I am looking for a source of buildings elevation, preferably stored as 2D images (for each pixel, the intensity corresponds to the altitude in that XY). Considering the case of NY, it would be a XY ...
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1answer
83 views

Find higher elevation (10m) perpendicular point from stream network at regular interval

I have a stream network and for that network, I want to find the points at regular intervals which lie at 10m distance perpendicular from the stream.The final goal is to find the buffer of that 10m ...
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0answers
102 views

Calculating elevations using Mapquest elevation API?

I have a Leaflet map that contains options for users to draw lines, i need to enrich the drawn lines with elevation data from Mapquest elevation API. here is my code: drawData = drawnItems....
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0answers
56 views

Route creation with specific length and elevation change [closed]

I'm currently working on a project for my computer science study. The goal is to make a service that allows the user to enter a distance and elevation change which will then result in a random route (...
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2answers
137 views

QGIS: How to store the GPS coordinates in the attribute table? [duplicate]

I got vector points on a map. I already have the elevation information in the table for each vector point and the point-id. Now I want to get the GPS coordinates for each point stored in this ...
3
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1answer
52 views

Copy elevation from points to line

I have a vector line, but it has no z-dimension. I have some points along the line, which have the elevation included. Can I add the elevation from the points to the line at that specific point? ...