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

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0answers
8 views

Rendering elevation data of planet_osm_line in GeoServer?

I have created a postgres data from osm data of sachsen and from NASA srtm data extracted elevation data of the same region. I have multilinestring with varying elevation data for a single road, so is ...
1
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2answers
77 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
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0answers
22 views

Is it possible to build a route profile for a street with “real” heights considering tunnels and bridges?

Is it possible to build a exact route profile for a street with "real" heights considering tunnels and bridges in an easy way with free data? Of course it is possible to remove thy waypoint located on ...
1
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1answer
74 views

Extract height values from vector to CSV

I have generated a CSV file (using the MMQGIS plugin) expecting to obtain all the coordinates of a vector layer that I have created. But the output file only contains the latitude and longitude ...
0
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1answer
26 views

In R's raster::terrain function, which way is north?

The terrain function in R's raster package calculates slope and aspect from an elevation raster: see http://www.inside-r.org/packages/cran/raster/docs/terrain. With the unit="degrees" option, the ...
2
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1answer
209 views

Can I use the Google Elevation API for academic research (licensing)?

I would like to use the Google Elevation API to generate about 5 elevation maps for master's degree research on aircraft collision avoidance. The data would be meshed and used in simulation to ...
0
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0answers
11 views

Create and save profiles of lines automatical in QGis or Arcmap [closed]

I have one polyline vector with 700 polylines and one raster file. I would like to make the profile of all polylines automatically and save it as csv or xls file. Associated with one polyline I have ...
4
votes
1answer
3k views

How to display an elevation profile and store the DEM elevation back to the KML line?

When I draw a track in Google Earth, for example along a road, I can right-click it to "Show elevation profile", and it displays a 2D plot of distance vs elevation. However, if I save the KML, the ...
0
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2answers
60 views

How do I convert XYZ coordinates to another projection system

I am trying to convert between coordinate systems in QGIS. I have a point file in NZGD49 coordinates (EPSG:27200) (referenced to the geoid) which I am trying to convert to NZGD2000 coordinates (EPSG:...
13
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4answers
5k views

Calculating elevation profile along line from a DEM?

Given a DEM (Digital Elevation Model) and a line (x1,y1) --> (x2,y2) (paired coordinates (x,y)), how can one calculate the elevation profile or cross-section projected on that line? I am looking for ...
10
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1answer
28k views

Calculating elevation profile for a polyline in ArcGIS 10?

My elevation data is a floating point tif. I have a road for which I need to calculate the elevation profile, but I can't see the tools to do this. Can I do this with ArcGIS, with spatial analyst/3D ...
3
votes
1answer
25 views

Are there any tools that can identify ravines/steep elevation drops from contour line data?

I am trying to create polygons around rivers that extend all the way up to the top of the surrounding slopes. I am currently able to do this using stream data and contour data, but I would have to ...
0
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1answer
23 views

Google Earth - Color Coded elevation data

I don't know anything about Global Information Systems. I want to do something which should be extremely simple and extremely common sense I have Google Earth Pro. I just want to see a color-coded ...
1
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2answers
62 views

Extract elevation data from contour lines

I am working with QGIS. I used raster-extract-contour to get contour lines from a raster image. Now I want to break up my single vector file into multiple layers based on elevation. How do I do this?
1
vote
1answer
264 views

Generate 3D elevation points grid from 3D contour lines!

I have a shape file with 3D contour lines. I want that based on this information to generate for all this area a 3D grid of points with certain distance from each-other like every 50cm. I use ...
1
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0answers
35 views

Interpolating Temperature over Elevation on ArcMap

I need to overlay or create a new image file in ArcGIS that overlays temperature point data I have for California onto a 30m resolution DEM for that state. I have explored Co-Kriging, however I have ...
0
votes
0answers
12 views

How to render elevation polygons as concentric polygons with increasing order of their height at given point in geoservert

I have create a postgres database that contains the elevation polygons at various elevation heights of sachsen. I wish to render these elevation polygons in a similar manner as they appear in the open ...
0
votes
1answer
17 views

GPX to Feature loses elevation

I have been sent a GPX file to create a trails network on arcgis. When I run the GPX to Feature tool the elevation attributes are all zero, however when I view the GPX file on an online view, there is ...
5
votes
1answer
74 views

Update from/to Z from attributes using arcpy Update Cursor

Trying to update Z values onto some point and line features from the level attributes on each feature. My script works fine on points - the previous Z values of 0 now have the same values as the ...
0
votes
0answers
13 views

Referencing DEM tif to MSL using GDAL?

I have a single band DEM tif representing elevation. How can I reference it to a datum and convert it to MSL altitudes? I'm using GDAL command line tool but don't know where to start. I looked at ...
15
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4answers
11k views

Where to download free elevation data for Europe?

Where can I find free elevation data for Europe? Please mention the available resolutions and terms of use when posting a source.
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4answers
390 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 ...
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1answer
1k 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
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1answer
261 views

How can I calculate elevation from relief?

I have an SDE Raster that displays relief, but I want to display elevation. How would I go about doing this?
7
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2answers
3k views

how do you identify ridges on an elevation raster?

I was wondering whether anyone might be able to tell me in layman's terms how to extract or differentiate between ridges and hilltops from 10m elevation data using ArcGIS 10.1?
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1answer
27 views

How to find lowest elevation change using raster data and w.r.t muliple polygons

I am trying to complete a spatial analysis which yields areas (parcels of land) which are comprised of polygons (in an attribute table) that correspond to the lowest land slope regions or smallest ...
0
votes
1answer
76 views

GRASS 7 Cost surface and elevation points development

I'm a new to GIS and I'm trying to develop an optimal path across an area by using GRASS 7 features. It is very similar to the task given here. The problem is that I don't have any data with ...
1
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1answer
41 views

Where to get free seafloor elevation for Galapagos Islands?

I'm trying to find seafloor elevation around the Galapagos Islands. Something with resolution 30 - 100 meters. Or just shaded relief for this region.
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2answers
216 views

Where do I get Elevation Data for Scotland?

So I am new here and I arrived here because I have been searching for quality elevation data for the entire Scotland but I have not succeeded yet. Kindly help if you know where to get the data Raster ...
2
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0answers
65 views

How to show a 2.5D surface of raster above terrain layer in Cesium?

I'm developing an web application that will show surfaces of rasters and terrain. These rasters are on GeoTiff format. I learned from example cesium can show image overlays earth surface. The ...
1
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1answer
56 views

How to select lines affected by sea level rise?

I'm doing a part for my master's thesis where I'm trying to find out which sites located near the coasts of Sweden that will be affected by sea level rise. I got a DEM with height data and have to ...
0
votes
1answer
44 views

Creating an elevation profile along a KML road based on ASC files

I want to make the elevation profile of a road in KML. I've found this online tool but its does not gives accurate elevations. I already have .asc files of the whole area that includes the KML route ...
4
votes
4answers
183 views

Google Earth Polygon surface area to follow the curvature of the earth model

Question: When drawing a polygon in Google Earth with latitude, longitude and elevation values at each node, how do you ensure that the surface area of the polygon also represents the desired ...
1
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1answer
266 views

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

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
0answers
44 views

Averaging elevation for fishnet points in ArcGIS for Desktop? [closed]

I have a problem with adding average elevations for fishnet points. First of all I surveyed an area boundary of 16km2 using total stations. I got nearly 800 points to finish the boundary in this way. ...
3
votes
1answer
40 views

How to find elevation highest and lowest for a state or city

I am trying to find out the highest and lowest elevation for these types of geographical areas: continent (lots of ways to get info) country (lots of ways to get info) state (for the US states no ...
1
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0answers
97 views

How to request elevation data from ERDAS Apollo?

I'm developing a custom application(Desktop based using uDig SDK) where user have a provision to select the line feature on map to view its elevation chart. So far I can do this using Google ...
19
votes
4answers
8k 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 ...
1
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1answer
166 views

QGIS - Level curves - Voronoi Polygons

I am facing a difficulty in QGIS (2.8.2): I have three layers: layer 1: layer with points layer 2: layer of level curves (contour lines) layer 3: layer of Voronoi polygons obtained from the points ...
2
votes
1answer
53 views

How to calculate mean elevation in a DEM between a specific interval?

I have a DEM with different elevations between 100 m & 3828 m. I just want to calculate mean elevation higher than 1500 m? Can I do that?
2
votes
1answer
31 views

contour lines/ basement contour extraction

My purpose: getting out area between elevation contours (like b/w 600m and 700m). The contours could either be elevation ones or the basement contours. I got elevation contours using spatial analyst ...
1
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0answers
89 views

How to create an elevation profile in google earth from a kml?

I have a KML file of a stream that I originally created as a line shapefile in ArcMap (one stream extracted from a larger watershed data set). I need to create an elevation profile of this stream. ...
3
votes
1answer
76 views

Reading 1/3 arcsecond DEM data using C++?

I am writing my own application to use and present elevation data. So far, I've been easily using the three arc second SRTM data presented in ArcInfo ASCII format. But now I'm looking to use the ...
3
votes
1answer
65 views

Calculating median elevation for local authority areas using OS Terrain 50

I haven't been able to find anything that could comprehensively help me with my problem. I want to calculate median elevation for UK local authority areas. So far I've taken the OS Terrain 50 data ...
0
votes
1answer
59 views

Get Elevation of XY points [duplicate]

I am working with ArcMap 10.3. I have imported DEM files. When I imported the files they had the extension of .DDF. I would now like to be able to take a list of XY coordinates and, for lack of a ...
7
votes
4answers
950 views

Precision vs Resolution in elevation data

Update: A good example of something I am confused about: on the Wikipedia page for "digital terrain model" one can find the following statement about a satellite in the "See Also" section: TanDEM-...
1
vote
1answer
983 views

Using GDAL in python to read elevation at a point from 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 ...
2
votes
0answers
26 views

Does USGS 3DEP data use a hash or checksum?

I'm downloading some USGS 3DEP elevation data, e.g., the file at the following URL: https://www.sciencebase.gov/catalog/item/563afea8e4b0d6133fe7357b The "ID" of this file is given in both the URL ...
0
votes
0answers
53 views

Convert EGM96 gps elevation to WGS84 ellipsoid elevation.

I have GPS elevation data (300k points) in EGM96. These points are located on the East US coast. I realise i need to work out the difference between the EGM96 and WGS84 ellipsoid in this region to ...
1
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0answers
27 views

How to find roads with similar incline?

I have no prior GIS experience, so please bare with me. What I'm trying to do is find a road (or a portions of road) from one country that is similar to another road(or portion of a road) from a ...