Questions tagged [altitude]

The height of an object or point in relation to sea level or ground level.

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How can I fix Error 1 "side location conflict" using clip raster by mask layer?

I've been trying to fix an error for days now and unfortunately I'm getting nowhere. I use QGIS version 3.34.3 and Windows 10. what I did so far: I downloaded the data from COSMOS Europe here: https:/...
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Is it possible to request GML using WFS-T for ZM type geometry? (Point ZM, LineString ZM, Polygon ZM)

I'm a newbie here. I'm not sure whether my question is good or not... But, I want to ask something. To use Transactional Web Feature Service (WFS-T) to insert an object of a Point type, I sent a ...
janghs17's user avatar
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QGIS update point location from NMEA

Can a point in a layer have its X, Y, and Z coordinates defined by a live NMEA string? What I'd like to have is a point that is constantly moving during an edit session based on the incoming GNSS ...
GISKon's user avatar
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What is the importance of altitude in coordinates (WGS84)

I have these parameter in my system. <AirportReferencePoint>N27584300 E034233600 43.586400</AirportReferencePoint> What is the use of the altitude 43.586400 in these parameters?
mahmoud youssef's user avatar
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Convert ERA5 data on zero degree level into meters above sea level

I am trying to calculate the zero-degree isotherm (altitude in which temperature is at 0 degrees) in meters above sea level. I used ERA5 data by ECMWF for this and I noticed that the values decrease ...
Phil's user avatar
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Is there an altitude measurement that would be negative with 5 digits and 10 decimals?

We received a data file that has altitude listed, but the format is unexpected. Here is the format: -######.########## Is there any altitude measurement like this? Or is this possibly a conversion ...
THE JOATMON's user avatar
1 vote
2 answers
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Best approach to calculate altitude based on multitude of points whose altitude is known

I developed a free and open source Geo API for Portugal and now I am trying to output also the altitude based on official values provided by the government considering official geodesic marks. Right ...
João Pimentel Ferreira's user avatar
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155 views

Mobile phone GPS altitude decreases when measured from high rise buildings

I am using my mobile phone (Motorola G30) in which I had installed GPS Test app, to measure altitude. I am coming across something really weird. Attached is the screengrab comparing the altitude ...
karthikeyan's user avatar
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Mapping series of points in CSV file [closed]

I've got a CSV file with bird-tracking data in. Each bird has its own unique ID, and has 1 or more unique flight IDs. Each flight ID has several timestamped lat/long points (digital degrees) and it's ...
Birdtracker98's user avatar
3 votes
1 answer
226 views

Finding highest point relative to point data

I'm very much a beginner with QGIS (3.10.4) and I'm still learning terminology etc so my understanding is currently quite basic. I'm trying to find out the highest point of a hill relative to a point. ...
Anni's user avatar
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Recording GEOID altitude instead of ellipsoid

The Trimble receiver is capable of outputting the geoidal height. But for the whole thing to work, I have to do the conversion with Qfield. so far so good - the display shows the correct altitude. I ...
Christian Volgger's user avatar
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Sudden change in altitude during measurement with GNSS

We work For some time now we have been working with QField and the GNSS receiver from Emlid. We get the accuracy via bluethoot from the receiver to QField. Lately, however, the measurements have been ...
Céline's user avatar
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2 answers
86 views

Including height information when exporting images from SlantView 2

I have a set of images that were collected with a slantrange multispectral sensor (S3P). To include the radiometric calibration information from the sensor, I use SlantView 2 (Ver. 2.17.4). I will ...
Jose Luis Landivar S's user avatar
4 votes
2 answers
888 views

Flight visualization in QGIS

In the CSV file I have accurate data on location, altitude, and time. In Google Earth point by point I manage to create the following visualization, is it possible to create the same visualization in ...
Nikolay Yordanov's user avatar
3 votes
1 answer
310 views

Obtaining area modified by altitude using PostGIS

How to change area calculation, making use of altitude? I am supposing that at Z=0 is the default (geoid surface) for PostGIS. So we can expect different area when Z=800 or Z=8000... But, using the ...
Peter Krauss's user avatar
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sunAngle() calculation in R giving wrong results

I need to find the hourly sun angle (angle at which the sun strikes the Earth) for a particular position (latitude, longitude) for a given day in Belgium. I used sunAngle() from "oce" ...
anna's user avatar
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Which height data is correct? [closed]

I own the following device - https://interrex-tracking.com/lego-small/ the device is attached to a bird, and every day I receive information about time and date, X and Y locations, altitudе and geoid ...
Nikolay Yordanov's user avatar
1 vote
1 answer
1k views

Uncorrected pressure altitude to WGS84 altitude

I'm trying to convert the altitude returned by an ADS-B receiver into its WGS84 altitude. It's been a wild ride trying to determine which type of altitude is returned from ADS-B (I get completely ...
Sittin Hawk's user avatar
2 votes
1 answer
193 views

Trying to delineate areas (riparian zones) from a DEM, with same height difference to a polyline (reach)

I'm trying to delineate riparian zones. The idea is to define a mean depth of the drainage net (constant), and then, draw a buffer around the reaches that will include all the terrain within this ...
Pablo Navarro's user avatar
2 votes
2 answers
268 views

Relation between Solar Radiation and Elevation: Satellite Data

I used DSR (Downward Shortwave Radiation) data from MCD18A1 product and GHI (Global Horizontal Irradiation) data from SOLARGIS to create solar maps: Using this elevation map: I see that the solar ...
Just_4n0th3r_Pr0gr4mm3r's user avatar
1 vote
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755 views

QField: get the altitude into an attribute

I'm trying to collect the altitude from the GPS of my phone in the a field a create. Here's the situation: A have a point geometry file saved in a gpk A field "Altitude", type double And in ...
Broady's user avatar
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Getting altitude with Trimble TDC 100 and QField

In our company we got Trimble TDC 100 and install QFlied for data collection. We collect points and polylines. Our aim is to get vertex and points while saving their altitude (height above the mean ...
herbert pondi's user avatar
2 votes
1 answer
136 views

Generating new data in curve (polyline) by interpolation of existing data in this curve

I am trying to add altitude data on the vertex of a polyline in QGIS. I have extracted points from the vector layer of the polyline to update the Z-value. I have altitude for some points, new points ...
kFly's user avatar
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3 votes
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How to properly point the Sun in CesiumJS?

I prepared a Cesium sandcastle example based on this answer from @FSimardGIS, but something is going wrong: only one of many rays correctly points to the Sun, the other appears random. What's wrong ...
jumpjack's user avatar
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Seeking maps to use on iPhone/Android app

How can I get data of the earth map on the iOS sdk "Swift" containing data altitude too? I would like to use all world map, gps position (but I think that's not a matter) and altitude of all ...
NinjaOwl's user avatar
2 votes
1 answer
373 views

Get altitude value from WMS

If I load a WMS service into QGIS I could query with the selection tool for every pixel the altitude value. Where does QGIS get this altitude value from? A WMS does not normally have any altitude ...
Dominik's user avatar
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Altitude information for European highways

I need to calculate the gradient in major European highways. Fot this I need altitude data for each highway, let's say every 100 meters. Are there such kind of data publicly available? If not, I am ...
eblOnSO's user avatar
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1 answer
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Speed of reading a GeoTIFF using geotiff.js

I am have created my own API to return elevations from GeoTIFF files using geotiff.js (https://geotiffjs.github.io/), but it is slow compared to public APIs. For example, table below shows the tests ...
Kissenger's user avatar
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Why is QGIS not recognising altitude from CSV file?

I used the Google Earth method for creating a KML file of points with latitude, longitude, and altitude as necessary information. After that I converted the KML file to GPX and then to CSV, through ...
Shianne Valencio Harvey's user avatar
3 votes
1 answer
276 views

GPS: what limits the _rate_ of change in altitude?

I have a GPS tracker/transmitter I use in rockets. I use it to locate and recover a rocket. I realize that Altitude is not the strong suit in GPS, and don't expect it to be really accurate. Neither do ...
jddj's user avatar
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3 votes
0 answers
876 views

WSG84, GPS, GEOID and other altitudes

INTRO A bit of tool introduction, but the problem is not related to this directly. I have an app in CesiumJS. I am using Cesium World Terrain, and get altitude using Sample Terrain Most Detailed ...
Crocsx's user avatar
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2 votes
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364 views

Correcting slope of river bed on DEM using QGIS or ArcGIS

I have a DEM that has incorrect value of altitude/slope in the river bed area. This is a result of the interpolation of elevation value that are close to the river and creates lots of errors. In fact ...
Giulio Donati Sarti's user avatar
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2 answers
265 views

Android app to get altitude of places to use in field visit?

I want to verify the height of the ground which is provided to me with the help of an app if available. Of course, I am aware an app will not give me exact value but for me, it works if it shows ...
MapQuest's user avatar
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-1 votes
1 answer
1k views

Extracting data from ASCII file? [closed]

I have ASCII files for a country that map altitude. I'd like to extract information on slopes for specific cities in my country. My goal is to have at least a rough idea of physical constraints in ...
JRPV's user avatar
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2 votes
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TIFF to KMZ passing altitude data

I am currently trying to create a KMZ from a GeoTIFF by using gdal_translate. This Works fine and I am accomplishing this by using by using this command gdal_translate.exe -of KMLSUPEROVERLAY c:\in....
Drew's user avatar
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5 votes
2 answers
15k views

WGS84 to MSL and opposite

I am using CesiumJS to create point in a map using World Terrain to get the elevation of my points. The point in Cesium are using WSG84. When I calculate the altitude using sampleTerrain I retrieve ...
Crocsx's user avatar
  • 123
2 votes
1 answer
158 views

Altitude differences in different CRS

Currently I am working on a project in Kosovo. After gaining autonomy the country "invented" their own CRS, which is driving me crazy sometimes. It doesn't even have an EPSG-Code, it goes by "Kosova ...
Erik's user avatar
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1 vote
1 answer
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Adding Altitude to a marker in WebGLEarth

Im trying to add an altitude to a marker in WebGLEarth but i cant figure out how to do it. I cannot find anything in documentation either. The idea is that my markers act as satellites so i need the ...
Owen's user avatar
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1 vote
0 answers
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Qneat3 / shortest distance calc sensitive to altitude?

I'm trying to calculate shortest distance using Qneat3 (using both the shortest path and OD-matrices for different purposes). And am wondering if there is any possobility to factor in altitide (it is ...
Frida_L's user avatar
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0 answers
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Convert MSL to WGS height

I need to find the coordinates for a given location in WGS coordinates. This mean geodetic latitude, longitude, and altitude (with respect to the reference ellipsoid). I was informed the coordinates, ...
Mefitico's user avatar
  • 101
0 votes
1 answer
183 views

Focal length vs Principal point

I have set of areal imagery. One of a parameters I get with images is camera's Principal Distance , what I'm looking for is Focal length, but I don't have Focal length at the moment I tried to ...
Toren's user avatar
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3 votes
1 answer
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How to plot a point on the highest elevation of a raster on a polygon. QGIS

I have a shp with more than 1700 polygons on a elevation raster. I need to plot a point that represents the highest altitude location within the polygons, and then export those points as a new shp.
Luna's user avatar
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0 answers
63 views

Why is my aspect not displaying the full data?

I am trying to get the slope aspect for the altitude shown above. Can someone please advise me on why this may not be working properly?
Billy Gardener's user avatar
2 votes
1 answer
1k views

Is kml altitude mode "absolute" equivalent to altitude over WGS84 ellipsoid?

I am working with an aviation software which outputs points with altitudes over WGS84 ellipsoid. Now I want to represent those points in Google Earth, writing a kml file. I know I have to convert the ...
Daniel Viaño's user avatar
0 votes
1 answer
564 views

GPS Altitude uncertainty and postional uncertainty in Lat/Long [closed]

I'm working on flight sensors for a project and I'm supposed to model GPS device noise. I looked a lot for it online and could not get a convincing answer. I need the uncertainties of altitude and ...
controlfreak's user avatar
6 votes
2 answers
5k views

Choosing datatype for holding Latitude, Longitude and Altitude in PostGIS?

I'm trying to take advantage of the many functions available in Postgis for dealing with latitude and longitude coordinate systems. However, I would like to add some altitude information to my ...
Fernando's user avatar
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0 votes
0 answers
121 views

ISA Model and GFS data

I have a newbie question... I always used the International Standard Atmosphere model whenever I needed to calculate the temperature in a given altitude. It always looked accurate to me... However,...
guilhermecgs's user avatar
2 votes
0 answers
2k 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 ...
newbie_girl's user avatar
5 votes
2 answers
9k 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 ...
newbie_girl's user avatar
3 votes
2 answers
626 views

Does Magnetic Deviation depend on altitude? [closed]

Magnetic declination, sometimes called magnetic variation, is the angle between magnetic north and true north. Declination is positive east of true north and negative when west. Magnetic ...
Federico Gentile's user avatar