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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250 views

How to extract Z data from a shapefile from points on another separate layer QGIS

I have two layers; one with elevation data (m), and the other with roads (derived from points via points to polyines). I want to run a spatial query that basically extracts the elevation data from the ...
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2answers
2k views

Seeking Elevation Data for Scotland? [on hold]

I have been searching for quality elevation data for the entire Scotland but I have not succeeded yet. Do you know where to get the data in Raster or Vector formats? Accuracy is very important as ...
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1answer
411 views

QGIS estimate height of feature vertices from TIN

I have a TIN representing a digital terrain model, and another polygon layer representing features (e.g. building outlines) which is assumed to 'sit' on top of the DTM. How do I calculate the ...
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2answers
31 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
24 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
514 views

Understanding datum and elevation of NASA ASTER DTM?

I have downloaded some data from http://asterweb.jpl.nasa.gov/gdem.asp I would like to relate the elevations to some coastal data which is estimated to a specific ordnance dataum. Can anyone tell ...
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1answer
1k views

What functionality exists to calculate Cut and Fill for excavation?

Does qgis have the ability to compare and quantify existing versus proposed elevations?
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5answers
2k views

Elevation correction ASTER GDEM2 (+10m)

My ASTER GDEM2 has a average elevation error of -10m for my area. (I testet it using 90 defferential GPS reference points and compared it with old Topo25, SRTM, and GoogleMaps). I would like to ...
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0answers
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Free GIS data that doesn't require attribution for printing on products

I'm keen to make some products to sell with map graphics printed on them. As these are physical products (eg tshirt etc) I don't want to include the attribution in the design. Is there a good source ...
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1answer
15 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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0answers
63 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
35 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 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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0answers
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
59 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
57 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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1answer
29 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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2answers
47 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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0answers
21 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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3answers
4k views

Seeking alternative to Google Maps Elevation API?

The Google Maps Elevation API lets me pass a URL like https://maps.googleapis.com/maps/api/elevation/json?locations=39.7391536,-104.984703 along with a developer key, and get a result like { "...
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1answer
116 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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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
156 views

Clustering plots points into groups based on their elevation using QGIS?

I have a plots shapefile for a region (polygon)converted to centroid points. I have added the geometry column to it and also added elevation attribute to every point by sampling the plots vector file ...
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2answers
49 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
45 views

Showing roads that are below 10 ft elevations using ArcGIS Desktop?

I have point elevation data and road layers for a region. How do I show the road sections that are below 10 ft elevations? I am using ArcGIS Desktop 10.3.1.
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0answers
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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
48 views

Just need a lo-res & 8-bit depth elevation map either real or fictional (BMP?)

I am a software developer working on a strategy game in my spare time as a hobby. I still have very little knowledge of and experience with Geographic Information Systems and the different file ...
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1answer
45 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
163 views

Show elevation profile from linestring's z values

I have linestring geometries with z values and I want to display them in a nice elevation profile (with x/z scaling functions, several profiles to overlay, and so on). Is there any QGIS function or ...
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1answer
193 views

QGIS: Edit elevation in DTM to get correct slope of a river

I am new to QGIS and just need it to do a hydrolocic analysis of an area of which I later make a flow model with HEC-RAS 2D. I made it according to this tutorial: https://www.youtube.com/watch?v=Ro-...
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1answer
27 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
19 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 ...
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1answer
198 views

Georeferencing X Y (AND Z) with GCPs in QGIS

I have GCPs recorded to centimeter precision in lat, long, and elevation. I want to georeference my UAV-photogrammetry-generated GeoTIFF and DEM with these GCPs (since the GPS on my UAV is only ...
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1answer
41 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
52 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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1answer
153 views

Use DEM elevation attributes in vector polygon?

I am modeling glacier retreat scatching polygons on DEM surface trying to come out with 3D scatch. Is it possible to adjust "height" of polygon to follow elevation of DEM surface (eg. glacier height ...
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1answer
1k views

Load National Elevation Data into a WMS server?

We have an application that can pull WMS data from the National Elevation Data set (NED) and use it to perform a number of run-time calculations. We have been pulling it from NASA JPL WMS servers ...
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1answer
77 views

Volume estimation using multidate DEM

I have 10 multidate Cartosat-1 stereo pair derived raster DEMs of dates ranging over a decade over a river sand area. I want to derive volumes of sand deposited in that period within that area. Is it ...
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0answers
68 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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0answers
28 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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1answer
62 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 ...
2
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2answers
87 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
193 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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0answers
28 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 ...
2
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2answers
3k views

Modifying DEM elevation data in QGIS using a polygon

I've tried searching through the existing questions but am struggling to find a succinct answer to what I am trying to achieve. For background, I am running a flood model in TUFLOW to help support a ...
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0answers
17 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
115 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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0answers
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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1answer
77 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 ...