The vertical distance of a point or object above or below a reference surface or datum (generally mean sea level).

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2
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0answers
22 views

How to get the most accurate elevation reading for the ground floor of a building?

I am looking into a way to calculate the elevation of the ground floor of many buildings in a study area. My plan is to run the building centroids against an elevation grid to get an elevation ...
0
votes
2answers
211 views

Calculate mean elevation over a region

For the purposes of spatial interpolation, I have created a grid using "Create Fishnet" in ArcMap10.2 (I use the "label points", which have a spacing of 0,00833333 degrees). For every point (label ...
1
vote
1answer
17 views

Free Digital Elevation (Terrain) Model of Europe or Germany

Is there any free (or not expensive) source of Digital elevation model of Europe or Germany with the resolution of 10 meters or better and vertical accuracy of +-5m or better? Thanks!
1
vote
0answers
24 views

I have a .adf file and want to select an elevation range [closed]

I'm super new to GIS. I downloaded a USGS 30m resolution map of a bay, and now I want to specify all areas that are between 0m and -30m elevation. I need to find where a defined area contains 0 and ...
1
vote
1answer
18 views

How do I extract elevation data from a DEM using points I have in a CSV?

So I have a CSV with a lot of fields. The first 3 fields are the ID, longitude, and latitude. I have already converted to decimal degrees, and said to display XY data. (Is there something else I need ...
1
vote
0answers
28 views

How to create buffers having regard to topography with QGIS

I want to create buffers of 25 kilometers around points in a point-shapefile with q gis. So far so good. My problem is that I don't need an air-line distance of 25 km around the points, but a "real ...
0
votes
1answer
28 views

How do you identify cuttings / crevices from a DTM or DSM using ArcGIS?

I am trying to identify where cuttings and crevices exist by using a DTM or DSM. My ultimate aim is to find where roads and rail lines sit within a cutting i.e. the land either side of them is higher ...
2
votes
1answer
22 views

Setting elevation data for tie points in Pix4D

I am currently working in Pix4D and am trying to assign elevation data to my selected tie points. I have aerial images taken using a camera with GPS from an aircraft and am working with a fairly ...
1
vote
0answers
56 views

Discovering highest point in area using QGIS?

I'll preface by saying I've never used or even heard of GIS software previously, so I'm sorry for being very clueless. My goal is to find the highest point in Highgate (in London, England). I have ...
0
votes
1answer
65 views

Reset a base elevation in Pix4D?

Does anyone know how to set a baseline elevation in Pix4D, or is that something that has to happen on the drone-capturing side? The reason is that I have an area which is flown with LiDAR, several ...
1
vote
1answer
196 views

How to obtain elevation value from given SRTM data on mouse click in web browser?

I need JavaScript code for obtaining elevation data from SRTM tiff image. I have used Google APIs, but I need for downloaded SRTM tiff image. (SRTM file is being loaded on a base layer, and both ...
1
vote
1answer
751 views

Using GDAL to read dted files

How do I get the elevation at a certain point using gdal to read in a dted file? I don't see much useful information out on the web. I'm sorry I should have been more specific. How would I ...
1
vote
1answer
984 views

How do I add elevation data to a GeoJSON line from a GPX file?

I understand that elevation can be added as an optional third value in Coordinates (lat, long, elev) in a geojson file, but I can't find a way to actually do that from a gpx file. I've used ogr2ogr to ...
-2
votes
0answers
19 views

Elevation data sources [migrated]

I need to know for example, heights of bridges/fly-overs from the land surface (just to know there is an elevated structure). How and where from can I get this data (preferably for EU)? Any open ...
1
vote
1answer
69 views

How do I assign elevation labels to a custom set of points in QGIS?

Im trying to create topographic surveys using georeferenced images from a drone and a DEM/orthomosaic which has been created using Photoscan. I've managed to create contours and label them with ...
4
votes
1answer
597 views

How to give elevation information to a polygon feature class using existing TIN file ? (geological mapping)

I'm an ArcGIS 10.1 user. My issue: I have a printed form of a map which depicts geological bodies being surface rock occurence. Additionaly, there are elevation contour lines. I digitized the map by ...
1
vote
0answers
16 views

Importing DXF - Polylines with elevation data

When importing a DXF file (containing 3D contour data) to QGIS, none of the various methods described elsewhere are retaining elevation data as an attribute. e.g. DXF2SHP, GRASS v.in.dxf, opening ...
1
vote
0answers
21 views

How to create a numerical mask file with the elevation points of an area with QGIS

I'm using QGIS and I have to create a mask file (.txt) as an input for a hydrological model. The file should be a numerical grid map that represents the elevation points of a catchment area, like the ...
1
vote
0answers
40 views

Elevation Profile Google

I am creating a longitudinal profile in Google Maps. For this, I created a function that lets you draw a line and when it disappears just drawn. So far there is no problem, but when I return to view ...
0
votes
1answer
30 views

Intersect elevation interpolated from CAD file in ArcGIS

I have two datasets - contours and vector (water, roads,...) Vector layers were used as breaklines to generate the contours. Then the contours were generalized a bit. For quality check I need to ...
2
votes
1answer
71 views

How to find a point with highest elevation in area using ArcObjects

Is there a way to find a point with highest elevation in specified area by using ArcObjects? Let's say that I have a raster with DEM and I would like to establish some areas of interest in this ...
0
votes
2answers
53 views

digital elevation model data help?

I know little about geographic data. I am trying to get a file of elevation data for the United Kingdom so that I can import it into a CAD program and convert it to an *.stl or *.dxf format. I ...
2
votes
1answer
208 views

Performing viewshed analysis with Dutch AHN files in QGIS?

i downloaded the new (dutch hight data) AHN files, and was trying to perform a viewshed analysis at some point near UTRECHT. The plugin (grass plugin) works ok, i tried it before with a dem map. ...
5
votes
4answers
2k views

What's the difference between hypsography and topography?

I've recently come across some data that has been labeled "hypsography". I looked it up and it sounds like topography. But this data source has data labeled "topography" separate from its ...
1
vote
1answer
44 views

Getting elevation readings at any lat,lon from shapefile with scattered irregular points

I have a set of x,y coordinates, each of which I'm trying to get an elevation reading for. The elevation data source, however, is not a regular grid, but consists of a shapefile containing scattered, ...
1
vote
1answer
75 views

Making DEM from contours without elevation data?

I got a shapefile with contours, but no elevation data is present. We can assume as known info, that the contours mark elevations at known steps (say, 20 m). Is it still possible to restore the ...
2
votes
2answers
86 views

Generate TIN from elevation data in Python (no Arc)

I would like to generate a 3d terrain model of an area, and I am stuck on creating the TIN (which I will convert to an STL). I know there are plenty of ways to use ArcGIS, QGIS, 3DEM, and various ...
1
vote
2answers
119 views

Determining Min and Max elevation in Python using GDAL? [closed]

I have a DEM file and shape file of specific area ,and i want to Create a module in Python that writes name of each area which is shows in the picture, with the greatest differences in altitude on ...
1
vote
2answers
46 views

Changing height/interpolation/shape of raster layer

I am kind of a beignner in ArcGIS and thought about and googled this problem for two days now. I am working in ArcScene making a 3D visualization of a bedrock surface of a town. I have a polygon ...
1
vote
1answer
37 views

How large is the entire ASTER Global DEM on disk?

I see from various online sources (including GIS.SE's own How to download the entire ASTER GDEMv2 dataset?) that the ASTER GDEM has 22'000 tiles, each 1°×1° and 3601×3601 pixels (each pixel being ...
1
vote
1answer
39 views

Regarding Atmospheric correction and Elevation DEM Projection system

I am trying to conduct atmospheric adjustment of Landsat 8 image bands using 6s algorithm (i. atcorr grass gis tool). It seems, in the input section, an elevation raster map should be provided. In my ...
18
votes
4answers
7k views

How to download the entire ASTER GDEMv2 dataset?

In October 2011, NASA released the new ASTER GDEM global dataset (30m) and I have been wanting to get my hands on it. The only problem is that it takes forever to download and I do not feel like ...
6
votes
1answer
300 views

How to create a chart of elevation using points?

I am using shapefiles with basic information including the x-, y- and z-coordinates. I want to see how the objects (in this case points, which are finds from an excavation) are scattered along the ...
1
vote
1answer
52 views

Calculating ground cover along a path

I'm trying to figure out an efficient way of pulling data about ground cover along a specific path, where I know the starting lat/long and the end lat/long. I've found that the USGS has ground cover ...
23
votes
5answers
1k views
0
votes
0answers
20 views

Predicting Potential Areas of Eagle Nests based on Slope and Elevation using Mean +- 1 Standard Deviation?

I am trying to predict Potential Areas of Eagle Nests based on Slope and Elevation using the Mean +- 1 Standard Deviation as the potential range that eagle nests could occur. I have data about known ...
0
votes
0answers
19 views

How to connect slope values from dem to polyline layer in ArcGIS?

Is it possible to connect those elevation data from raster to polyline layer? I need to create a network analysis for the best way with the smallest elevation difference. Cheers, Kate
4
votes
1answer
2k views

What is the highest obtainable resolution of FREE elevation data in the UK?

I am seeking closure with this question guys. I am aware of various sources of free elevation data ~30+ m, and I have been searching for higher resolution FREE data for a while now. This already ...
29
votes
7answers
20k views

Choosing colour-ramp to use for elevation?

This is maybe rather subjective as it concerns style, but I would like to have a few decent colour ramps for my DEM when it is layed over my hill-shading. I have created the Swiss hillshade model as ...
1
vote
1answer
49 views

MapServer & Raster picking / Elevation data

I have some GeoTIFFs with elevation data, displayed in OpenLayers or Leaflet via WMS from MapServer. I need to be able to request (from the client) the elevation at some point clicked by the user. ...
1
vote
0answers
43 views

Getting Z values from source points to transfer to points digitized from them?

I have a set of points that I bring into ArcMap as a shapefile, these contain X/Y coordinate data as well as Z data (Elevation). I am using this to digitized from so when I make a new point file I ...
2
votes
0answers
55 views

High-level method for offline future road elevation data

I am new to GIS, so please do not hesitate to call me out in providing limited information. I have a .tiff Terrain (elevation) data file for the east coast of the US and a .osm.pbf OSM file for ...
1
vote
0answers
20 views

Export 3D data dxf file problems with elevation value

I have the problem that i can´t export a shp file into DXF and include the eleveation value I make all the procedure explane on "export 3D data dxf file 4" but each time I have the folow error: ...
1
vote
1answer
121 views

QGIS elevation and relief shade

I am trying to generate a map with terrain and elevation in QGIS and as a beginner I have followed tutorials on how to generate contours and hill shades succesfully. However, I don't know what are the ...
0
votes
0answers
52 views

Help creating a 3D elevation map using ASTER DEM .TIF image

I am trying to figure out the whole process behind creating a 3D elevation map of a region that I have downloaded ASTER DEM data for. Any help with this would be much appreciated! Thanks
5
votes
1answer
4k views

Labeling contour lines in ArcMap [duplicate]

Can anybody give me advice on how to label contours as shown in Figure 2 below? I would like to be able to put the label "on" the line, which is easy enough. But I'd also like for the contour line to ...
0
votes
0answers
42 views

Terrain elevation in QGIS

How can I get started with creating a map with elevation just like this one: Basically I need a map that looks like the one above. Can someone tell me where can I get the data, and how do I process ...
2
votes
1answer
60 views

Adding elevation data to a network dataset

I am trying to add elevation data to my road network to more accurately calculate walking distance to and from schools. I have figured out how to do the network with out elevation, but for the life of ...
1
vote
1answer
145 views

SRTM vs Google Earth Pro elevation data

I am working on elevation data for an area in Sudan. Between Google Earth Pro and SRTM elevation data, which one is more reliable?
0
votes
0answers
30 views

Convert .adf file to grayscale heightmap

I have downloaded a zipped folder containing multiple .adf files with elevation data from http://viewer.nationalmap.gov/. I want to create a 16 bit grayscale heightmap (tif) from the downloaded files ...