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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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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data.frame and get_elev_points. Error in locations$elevation[idx_s[i]:idx_e[i]] <- unlist(resp$height) : replacement has length zero

I am trying to use the function get_elevation_points in a data frame, but keep getting the same error: > #get the API key : et an API Key from https://mapzen.com/developers. Since elevatr will ...
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428 views

Converting elevation from EU-DEM (ETRS89) to WGS84

I'm having a hard time trying to use elevation data from EU-DEM. This data is in ETRS89 (EPSG:4258), according to their site. Now, when I extract the elevation for a shore, I get 0 meters of ...
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Web page that dynamically draws contours at user specified elevation?

How might I setup a web page that will draw dynamically contours and/or hypsometric tints at a user specified starting elevation and/or interval? Example scenario: flood hazard modelling. The web ...
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215 views

Are there any web services that return an elevation raster given a bounding box?

I have an application that uses raster elevation data extensively in its computations. I would like to have a tool that allows users to define the minimum and maximum latitude-longitude coordinates (...
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Elevation from GPS Vs. Query Elevation from Static TOPO database like SRTM

As far as I understand the GPS determines Elevation by real time calculations. What I don't understand is how? For example let's assume perfect (errors free) Lat/Lon fix by GPS. So I can query static ...
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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 ...
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148 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 ...
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456 views

How to get elevation of a coordinate given a dtm file out of a PostGIS?

What would be the best way to get elevation of a coordinate out of a PostGIS database (SQL/plpgsql) given a GeoTIFF dtm file? Importing as PostGIS Raster (which seems more costly) and calling ...
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Programmatically download NED, Landcover, etc. data from USGS [duplicate]

What are my current options for downloading geodata (NED, landcover, etc.) from the USGS programmatically?
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125 views

How do I determine the subsidence of land in Manila, Jakarta and Bangkok?

Can I see how these cities have lost elevation using digital elevation models? Is there a digital elevation model which data are updated? Or are there other methods?
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How to select a subset of a DEM in ArcScene?

I'm using ArcGIS 10.0 and trying to open a digital elevation model in ArcScene. I'm working on a project and got the DEM data from official sources which is quite huge. The resolution of the DEM is 1 ...
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742 views

How to calculate buildings shadow areas

Is it possible to calculate shadow areas of buildings or simulate shadows of buildings in a city using e-cognition software, with the DSM of the buildings and the sun angle and azimuth known?....If ...
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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 ...
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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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ArcGIS elevation? [duplicate]

I would like to get the elevation of different point in the digital elevation model means around 4000 points would any one please tell me how can it be possible.
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How to decrease elevation values of DEM using open source GIS sotware? [closed]

I am newbie in QGIS, but I was wondering how to decrease elevation dem DEM using QGIS? Can QGIS do that? Or anyone of you can tell me any open source GIS software to perform that?
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max elev value from raster [on hold]

data: raster (srtm) polygons a. (1 degree grid) polygons b. buffer from polygon a. (1 degree grid with outer buffer 8 km.they overlapped) HOW to take: max elevation in every polygon a. max ...
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Is there a way to linear reference a line in QGis [duplicate]

Iv'e seen a number of plugin's that do things like create grids of points and such like, but what I need to do ideally is to create a line of points that follows a line geometry, and then drop those ...
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60 views

Elevation Data in form of a database or colored Map

I am new to the GIS Topic and I hope someone can help me in the following. I am looking for elevation data for the whole world in the form of a database (Latitude; Longitude; Elevation(Level over ...
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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 ...
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32 views

Seeking contour (topo) lines for United States?

I can find five foot contours for most areas, where can I find 1 foot or 2 foot contour lines? Prefer ArcGIS or AutoCAD but will take anything I can get.