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
254 views

TIN interpolation errors and weird lines [Qgis 2.18]

I want to create an elevation model in EPSG 4326 from 2 shapefiles [img0] : elevation lines [Altimetria linee Antrodoco] and elevation points [Altimetria punti Antrodoco], both obtained by the ...
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1answer
94 views

Including elevation values in polyline (to export it as ASCII table)?

I'm using a code to simulate flood events and I need to build two main files: one with the river channel width and another one with the bed elevation (both in ARC-info ascii raster format). I've ...
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0answers
173 views

Which STRM resolution Srtm2Osm.exe uses?

The piece of program Srtm2Osm uses SRTM elevation model from NASA to produce countour lines in OSM format. Does it use the SRTM1 at 30m or SRTM3 at 90m?
2
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1answer
246 views

GRASS GIS: Interpolate DEM from irregularly spaced coastal survey data

I am attempting to interpolate the elevations of data sets of cross-shore survey transects. The data set size range from 50k to 300k points with ~100m between the transects and 1-5m between the points ...
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1answer
136 views

Convert elevation

I have a big trouble with a DTM. I have original DTM with SR WGS84/32633. Now I want merge at it a new DTM create from LiDAR data, but this (new DTM) have elevation that is 40/42 meters high that ...
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2answers
621 views

Get values of terrain elevation of roads in QGIS?

I have one DEM raster layer with elevation values and one vector layer of the roads; same size, extension and CRS. I want to do what this guy did here: http://youarealegend.blogspot.de/2012/07/...
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0answers
412 views

Reading SRTM30 Plus data with Python

From How to extract elevation from .HGT file? I know how to get the elevation from SRTM1 and SRTM3 files. But how to get elevation from SRTM30 Plus ftp://topex.ucsd.edu/pub/srtm30_plus/srtm30/data/ ? ...
2
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1answer
56 views

Handling an irregularly shaped elevation raster file

We are trying to process a set of elevation rasters of increasing resolution. We have a 30m resolution file that covers a large area, and a 5m resolution file that looks something like this image. ...
3
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1answer
119 views

Assigning elevation to reclassified raster in ArcScene or ArcMap

How it it possible to make a 3D view of reclassifed raster map in ArcScene or ArcMap? I have identified a potenial avalanche area using DEM in ArcMap and now I want to have this map in a 3D view in ...
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2answers
736 views

GPS Elevation height

I want to calculate the height of an object based on nearest ground surface. I have GPS coordinates and GPS elevation(which I assume is ellipsoid height) as an input in WGS84 coordinate system. I read ...
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0answers
78 views

Align approximately colocated vector points for comparison

I have a more general, methodological question and do not have much knowledge about GIS techniques. I have 6 topographic survey ([x,y,z] point clouds), each representing the same dune/beach system ...
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1answer
93 views

Conversion of elevation from Wusong Datum to Chinese 1985 National Datum to WGS84

I want to combine/compare raster data from a digital elevation model (EarthEnv-DEM90) with surface water level data from China. Unfortunately the water level data is given in a vertical Datum with ...
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1answer
1k views

Extracting values from raster to get elevation values in R?

I am trying to generate an isoscape using IsoriX in R. Here how my data looks: > head(dataC) siteID long lat animalID species tissue.value 1 A -5.88 53.82 CC1_33.2/1_15 ...
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0answers
65 views

Deriving Topographic Information from Geotagged Photos?

I wish to extract elevation data from geotagged photos? I have worked with DEM's and the open source CLI program: GMT for my graduate studies. I own a DJI Phantom 3 and used the trial version of ...
14
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1answer
400 views

Creating Buffer Polygon following Elevations using ArcGIS Desktop?

What I'm looking to do is put a 100 m buffer on a polygon, but rather than the buffer being at a fixed width "as the crow flies" I want it to follow the slopes of my Lidar DEM. I have ArcMap (with 3D ...
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0answers
243 views

Obtain elevation from a request lat,long with a map .tif

I am trying to get the elevation between two points in a route of Spain using APIs with HTTP request. I am using OpenStreetMap to get the routes, but I don't know how extract elevation with other tool....
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3answers
272 views

In DEM data there the elevation ranges from - 156 to 3877. What does this mean?

The elevation of that (project) particular landform cannot be negative (I think). Does this mean the DEM data is wrong?
4
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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)....
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2answers
336 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 ...
3
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3answers
951 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 ...
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1answer
84 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
232 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
311 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 ...
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1answer
1k 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 ...
2
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2answers
483 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
321 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 ...
1
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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
800 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
596 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
235 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 ...
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1answer
300 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
558 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
3k 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
71 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. ...
3
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1answer
280 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
93 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
185 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
906 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 ...
3
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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
456 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
4k 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
71 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
50 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
307 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
260 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
70 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
132 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 ...