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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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1answer
2k views

Set the minimum and maximum values for an elevation raster in R

I have a raster that displays elevational values at a global scale. I would like to set the minimum and maximum values based on the values I would like to choose. > elev class : RasterLayer ...
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1answer
2k views

Contour lines (*.shp) into XYZ

I downloaded a TIFF image from USGS Earth Explorer from which I determined the contour lines and saved them in a shapefile (see tutorial http://www.qgistutorials.com/en/docs/working_with_terrain.html)....
5
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2answers
313 views

Converting sign for a 32-bit GeoTIFF with an open source tool?

I have a 32-bit GeoTIFF that represents floating point elevation values, and I'd like to change the sign so that the values are negative instead of positive. What is the easiest way to do this using ...
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3answers
770 views

How to quickly download all GMTED2010 data?

Is there a way to automatically download all the tiles in GMTED2010 data? From: https://topotools.cr.usgs.gov/GMTED_viewer/viewer.htm I can only seem to be able to download by double-clicking tile ...
0
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1answer
79 views

Using points of elevation stored as Google Fusion Table to draw elevation profile

I recently extracted a huge number of elevation data from government plans and has inputted to Google Fusion Table. Now I wish to obtain a elevation profile from these data along a route, e.g. a bus ...
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1answer
212 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 (...
3
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1answer
291 views

Counting pixels on raster image

I have a raster file that show forest cover, very simple, where there is a green pixel there is forest. I need to count how many of this pixels fall under a certain elevation. I have the elevation ...
1
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1answer
988 views

QGIS Elevation Classification by Intervals

I am trying to classify the elevation of the information on a raster by intervals. Right now I am only able to produce a continuous band of color. How can one display the elevation information like ...
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2answers
434 views

Algorithm for smoothing DEM without losing max and min elevations

I am looking for a method/algorithm for smoothing a DEM raster similiar to something like lowpassing, however I want to keep the highest and lowest points, resp. peaks. Latter often are only ...
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0answers
303 views

How to get elevation data from XYZ source in Openlayers 3?

I have an XYZ file. For each pair of latitude and longitude values, there is an elevation value in meters in the file. How do I get those elevation values in Openlayers 3? Basically, my map will ...
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2answers
6k views

Extracting elevation data from DEM files using QGIS [duplicate]

I know how to generate contour lines from a DEM file once the file is loaded in QGIS and I also know how to open the attribute table for the contour lines which show elevation against IDs. Is there a ...
2
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0answers
708 views

Correcting incorrect altitudes of points recorded by my Android or how to calculate Geoid Height in QGIS

I tried to edit my question with more details and I also think that lot of people can benefit from this question! I was recording a track with my Android and later I found out that I end up having ...
4
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2answers
4k views

Inaccurate altitude GPS data with my Android?

I've been recording tracks with GeoTracker on my Android. In places I have points that have altitudes higher than the peaks of a mountain. Like one altitude difference is 46 m. How is it possible to ...
2
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0answers
507 views

How to calculate elevation of the point?

I have two points: A ( x1 ( latitude ), y1 ( longitude ), z1 ( elevation ) ) and B ( x2, y2, z2 ). x1,y1,z1 and x2,y2 are known, also I know the distance between A and B. How can I calculate z2 ...
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0answers
215 views

ArcGIS create profile graph from existing point feature

I have a dataset of X,Y points (with a spacing of 20m between the points) that represents a flowline along a glacier. Next to dat, I got another point dataset of the glacier height with X,Y points and ...
0
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1answer
266 views

Line feature with elevation points?

I need done seems to be a simple task, but I cannot find out how. I want to create grid lines for a specific area at a specific angle (which is the easy part). Now I want on every gridline to be ...
5
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1answer
493 views

Determining if shapefile has elevation or z coordinate values stored using ArcGIS Desktop?

I have a water main (line feature) that I wanted to get the elevation. As this is a subsurface feature I can't use any surface file to find these calculations. I wanted to use the calculate geometry ...
6
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1answer
1k views

How to calculate the difference in elevation between two datasets of points?

I have two datasets of different points in the same coordinate system, which describe the same line (road), so I want to see the difference in elevation between them. I've been told that I should ...
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3answers
2k views

Elevation info for multiple lat long coordinates

I have a list of 100 lat long pairings that I wish to get the elevation data for. I am familiar with Google Earth and I can plot each of these points but when I check the properties there is no ...
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0answers
68 views

Filling missing pixels of ASTER DEM

I need to perform hydrological analyses and map design purposes (hillshade creation) on a region far north. It is too northern to be covered by the SRTM DEM, therefore I am using the ASTER DEM. ...
2
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1answer
239 views

ArcGIS: how to obtain an average elevation for grid squares superimposed on a DEM? [duplicate]

Given the DEM of a certain Country, and a fishnet that is superimposed on it, I need to compute the average elevation and slope corresponding to each square in the fishnet. [I am using ArcGIS 10.3.1, ...
2
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1answer
88 views

What is elevation relative to in EPSG:2284?

I have some locations in EPSG:2284: (3669486.63386,11293013.10592,709.08004), (3669559.13811,11292972.72831,711.60055), (3669639.51308,11292851.48264,712.22258), (3669800.62304,11292949.38118,714....
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1answer
167 views

Finding highest path of DEM or contours file within area using ArcGIS Desktop?

I would like to create a polyline from one specified point to a target point. In between, I'd like to the vertices to fall on the highest point of elevation of that Y coordinate. Essentially, this ...
4
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2answers
763 views

Looking for the simplest way to get elevation for a give wgs84 coordinate

I started a project and write an application in java using geotools. I have an simple geoobject with the attributes latitude, longitude and altitude. Now i have to determine, wheather the geoobject is ...
2
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1answer
2k views

Terrain() function for computing slope and aspect from elevation data always returns NA

I'm facing a problem with the terrain() function in the raster package (in R) since yesterday. I'm working with elevation data and coordinates in Lambert 72 (espg registry : "+init=epsg:31300"). Here ...
2
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1answer
437 views

Locating flooded area by creating buffer with elevation around points using ArcGIS Desktop?

I have a shapefile with points, that each have an elevation in their attribute tabel, based on how high the water level is, at a given return period. I need to create a buffer around these points at ...
0
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1answer
3k views

Getting elevation at particular coordinate (lat/lon) programmatically (but offline)?

I would prefer something in python (but I would settle for any programming language) and something that I could install on my own server so the only limitations would be hardware (no throttling, no ...
3
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2answers
69 views

Selecting based on distance and change in elevation

I am trying to find areas near a series of roads that are withing 500 ft of the road, and have a change in elevation of +50 ft. I have been provided a 2 ft contour of the area, and a centerline layer ...
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0answers
48 views

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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0answers
284 views

How to elevate cross-sections in HEC-RAS 5.0.3?

Then creating the cross sections in HEC-RAS it appears that all of the cross sections are in the same elevation. I have tried to change each elevation then creating each cross section, but I get ...
0
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1answer
217 views

Elevation profile extraction to excel using ArcGIS from DEM in a tiff format

I have an SRTM image in .tiff format downloaded from USGS website and I want to extract elevation along a path to a Excel file in the form of distance vs elevation or lat,long. vs elevation. Can ...
2
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1answer
62 views

Elevation profile and chemical concentrations

I have a IDW layer showing the pattern of a chemical concentration. I have also created an elevation profile across the same area. Is there any way to include the IDW measurements with my elevation ...
1
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1answer
124 views

Method to buffer points using euclidean distance and change in elevation [closed]

I am looking for a method to buffer a set of thousands of points with known elevations by 150m Euclidean distance, and then limit the area in each buffer to 50m higher or lower in elevation than each ...
2
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1answer
435 views

Google Maps Elevation license

I would like to use Google Maps Elevation API to query elevation data for my future free and open source script. What I would like to know is what is the exact text which I need to include in my ...
0
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1answer
616 views

Height map free API

I need to recreate a landscape in 3D or real World areas by using WebGL technology. The typical area I need to get height map for is about 1km x 1km and resolution should be as much accurate as ...
1
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1answer
76 views

Effects of lower-resolution data?

I'm working on a project to get the maximum elevation along a 10-mile wide corridor. To accomplish this I've loaded raster elevation data into a PostgreSQL database, and used the PostGIS extensions to ...
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0answers
193 views

Making 3D “wall” from elevation points using ArcGIS 3D Analyst?

I went for a jog around the block using my GARMIN GPS. Then, I downloaded the GPX file and converted it to a feature class. The attributes for the points contain lat/lon & elevation (feet). I ...
1
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1answer
312 views

Finding xy coordinates of high and low elevation values in DEM

I have a 32-bit floating point GRID containing elevation data created in Hazus 3.2. The area defines the elevation of a specific boundary for a flood study. I need to find the xy data for the high and ...
3
votes
1answer
277 views

Postgis Self-intersection on geometry<->raster comparison

I am rather new to postgis and try to get a (weighted) average height of an area around a point. I am running Postgresql 9.5.5 with Postgis 2.2.1 on Ubuntu. I have imported ASTER GDEM elevation ...
1
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1answer
129 views

How to show elevations within a 5% slope or less in ArcMap 10.4?

I have a vector contour shapefile that shows elevation lines (i.e. USGS topo contours). I want to highlight areas that have a slope of 5% or less. I was wondering if someone could explain how to do ...
1
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0answers
304 views

Postgis Geo Elevation Raster: Get average Elevation

I am running Postgresql 9.5.5 with Postgis 2.2.1 on Ubuntu. I have imported ASTER GDEM elevation information as a raster and query it for elevation using geo coordinates. Currently I use ...
5
votes
2answers
5k views

Does Google Maps Elevation contain buildings, trees, and other structures?

Does anyone know whether Google Maps Elevation data removed buildings, trees and other non-terrain related structures from its elevation data? I checked their pages, but couldn't find an answer to ...
3
votes
1answer
249 views

Elevation profile using linear shape in ArcGIS Desktop?

I'm working with ArcMap 10.2. So, it's not a duplicate of "Displaying elevation profile and storing DEM elevation back to KML line using QGIS?". I have a linear shapefile that has only one element (a ...
2
votes
1answer
163 views

GDAL's Gnomonic projection — where do I set the elevation?

I have an existing application that uses a Gnomonic projection where the elevation at the origin is added to the earth radius that is used in the projection calculations (6378137 plus elevation in m). ...
1
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1answer
44 views

Converting polyline to raster with varying cell value along shapes?

I have a polyline file with start and end elevations. I'm trying to convert this to a raster which will have as values a gradient between the start and end elevations along the line. Is there any ...
2
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0answers
267 views

DSM and buildings height

How can I create a Digital Surface Model in order to collect the height of buildings and what's exactly needed to create a Digital Surface Model? Any software provide creating it (ENVI or PCI ...
2
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0answers
131 views

Is elevation MCDA possible in QGIS? [closed]

Taking into account topology and existing building heights, would it be possible to do a MCDA and examine where densifying through new construction would be most profitable*, assuming that new ...
3
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2answers
105 views

Exporting grid line nodes with ELEV attributes as data frame? [closed]

I would like to have a data frame of nrow x ncol where nrow = rows of my grid lines and ncol = col of my grid lines. The purpose is to use the ELEV data for 3D topography modeling in R. This is what ...
2
votes
1answer
2k views

Querying Elevation Data in Postgis

Problem: I have a bunch of raster data (DTED) and I want to use this to make elevation queries using PostGIS (if it makes sense). E.g. I want to ask the question "what is the elevation at (lat1,lon1), ...
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0answers
46 views

Getting the elevation of 400 million points in the US, how to get the elevation of these points from a dataset? [closed]

I'm a software engineer working on a game concept that would create the United States in the form of a grid, each grid being 200m x 200m in size with an elevation attached to each corner to create a ...