Questions tagged [elevation]

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

2
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1answer
911 views

OpenLayers: line elevation profile with slider

I have an OpenLayers client displaying tracks from a vector source. I would like to display an elevation profile of the track. When hovering mouse on a point on the elevation profile, a marker should ...
-2
votes
1answer
109 views

Can I change the maximum elevation value of a DEM? [closed]

I have a DEM derived from photogrammetry using DroneDeploy and it has come out very nicely in terms of resolution, but the elevation values are all wrong. I know the exact elevation of the highest ...
1
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1answer
443 views

Getting average elevation in floating point format around NumPy point coordinate?

Based on How do I get the pixel value of a GDAL raster under an OGR point without NumPy?, I wrote the following python function to find elevation height values of given coordinates in a DEM file: ...
4
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2answers
326 views

How to form a V-Shape field of view from any given point (i.e. latitude longitude)

I want to visualize the V-Shape polygon which can be referred to field of view as well. So, far i have been able to find the latitude and longitude of a certain point when i give an input of latitude ...
0
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1answer
268 views

Assigning Z Value to DEM Raster

I am working on projecting a DEM raster in ArcScene to drape some 2D imagery over it, and ran into a snag. Upon further analyzing my DEM TIF file, it does not have an attribute table, which lead me to ...
0
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1answer
394 views

Convertion of a .dem file to coordinates and elevation

I have a .dem-file with elevation data of an area and I am looking to programmatically convert this data to coordinates and elevation in C++. After a lot of searching, it looks like GDALTranslate ...
1
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1answer
119 views

What is the elevation unit of the Natural Earth's Shaded Relief raster? [duplicate]

I need to use this raster data to extract elevation for points and polygons, but I am really confused about the unit of the pixel values http://www.naturalearthdata.com/downloads/10m-raster-data/10m-...
1
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0answers
34 views

How can I verify the z values of my countour line file in ArcGIS/QGIS? [closed]

I have a shapefile with countour lines and I want to verify if the z value for each countourline is correct when compared with their neighbors. How can I do that in ArcGIS or QGIS?
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1answer
1k views

How to show elevation on mouse hover in ArcMap?

I need to show elevation of a DEM on the bottom bar (or wherever) on mouse hover in ArcMap 10.2.2. Is it possible? I know I can access to it by opening "Identity", but that is not practical. It ...
0
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3answers
82 views

Is there a tool in GIS to find the surface of a profile section in a DEM?

For example I have a DEM of river bed over which we made several profiles – eg sketch: http://prntscr.com/cqwile Now in cross section, it will look like this http://prntscr.com/cqwx59 . Is there a ...
2
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3answers
87 views

Elevation graph shows all the profiles starting at the same point eventhough one of them starts farther inland?

I am trying to compare 3 interpolated lines to analyze sediment movement after beach nourishment. Two of the lines start at the same point, but a the 3rd one starts farther inland. However, when I put ...
2
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1answer
92 views

Contour vs elevation semantics

I accept I am being a pedant here, but feel the semantics are important.. If I were to drawn a path representing a 'route' between 3 random points on the earth's surface, then establish the nearest ...
4
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1answer
763 views

Converting elevations into correct units with pyproj?

I am converting a point from wgs84 into a state plane coord system (epsg: 32051, which is defined in US survey feet) using pyproj, but the transform isn't changing the z values into feet: point_4326 =...
-1
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1answer
149 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 ...
0
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0answers
85 views

Granularity of elevation in GMTED2010 data / understanding shapefiles

Following on from Records of shapefile do not contain every field, where @scruss provided some very helpful Python code. I seem to have a fundamental inability to understand a shapefile (reader ...
2
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3answers
3k 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 { "...
2
votes
1answer
230 views

Is there any difference between a stream's Longitudinal Profile and its Elevation Profile?

I have derived elevation profile of a river channel using USGS SRTM 1 ArcSec. I am interested to know whether Elevation Profile and Longitudinal Profile are synonymous?
1
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1answer
368 views

Calculating mean altitude of watershed for each cell of DEM?

I have a DEM of river basin, and I need to create a raster where the cell value will be the mean elevation of watershed of this cell. I have calculated watershed area (flow accumulation x cell area). ...
3
votes
2answers
149 views

GeoTiff Elevation Service

Is there a standardized web feature (WFS) or web processing query to get a single pixel value from a map? I don't need a whole tile, which seems to be what the WFS and WMS standards are designed for....
0
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1answer
164 views

Add height/elevation in generated sql files from osm2po

I am using osm2po to generate a routable network (by importing .sql files from osm2po into a PostgreSQL/Postgis database). This works great using the post process filters PgRoutingWriter and ...
0
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1answer
44 views

gdal and google earth (and my gps) not reporting the same value

I am playing with srtm files and I dont quite understand my results. I am testing a lat lon of N39 W77 or 39.0,-77.0. I have tested using the python script from this post: How to extract elevation ...
7
votes
2answers
120 views

How can I generate linear elevation raster?

I want to generate a raster for testing purposes. I'm using QGIS and I was hoping it would have the tools to do this but I couldn't find a way. The raster should be 1001 m x 1001 m in size with each ...
0
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2answers
625 views

1ft contour shapefile displaying in meters

I generated a shapefile that has 1ft contours. It works great when imported to QGIS except the elevation labels are displayed in meters instead of feet. I've found two places to select feet as the ...
1
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1answer
252 views

QGIS: Show line ELEV on hover or select?

I've installed the value tool plugin, but cannot figure out where it outputs. I tried map tips in qgis. How can I see the elevation of a line or selected point on hover or select?
1
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1answer
229 views

Google maps elevations

I found out that it is possible to get the elevation values for particular location, by using Google maps API: https://developers.google.com/maps/pricing-and-plans/#details What I couldn't find is ...
1
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0answers
237 views

Calculate elevation profile for a line from dem data [closed]

We are trying to implement a service which takes a line geometry as its input and calculates elevation profile along that line from dem data (img format). How could we achieve this using postgis or ...
2
votes
1answer
168 views

Is elevation (height relative to sea level) constant, despite sea level rising?

Is a 10,000' peak still a 10,000' peak if sea levels have risen a foot? Is it a 9,999' peak now, or is elevation just a constant? Seems odd that a patch of land a few feet above "sea level" could sit ...
1
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1answer
272 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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0answers
78 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 ...
2
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1answer
936 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 ...
1
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1answer
309 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 ...
1
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2answers
1k 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:...
2
votes
1answer
167 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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2answers
5k 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
528 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?
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0answers
350 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
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1answer
44 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
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1answer
175 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 ...
1
vote
1answer
50 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 ...
1
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1answer
989 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.
2
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0answers
330 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
338 views

Selecting 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
218 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 ...
1
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0answers
110 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
2answers
747 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 ...
2
votes
1answer
560 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
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1answer
57 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 ...
4
votes
1answer
2k 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. ...
2
votes
1answer
166 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
869 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 ...