Questions tagged [altitude]

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

23 questions with no upvoted or accepted answers
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Height of the geoid in ECEF coordinates

I know that the relationship of geoid height N and ellipsoid height h to orthometric height H is defined by H = h - N, but what if I have some position in Earth-Centered-Earth-Fixed (ECEF) coordinates?...
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158 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 ...
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0answers
162 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 ...
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0answers
62 views

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....
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0answers
1k 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 ...
2
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0answers
989 views

Height above sea level measurement

I would like to use height above sea level in the gravity equations. What is the source for getting it? Can i use altitude measurements from Altimeter or GPS 'z' measurement? For your kind information,...
2
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0answers
79 views

Three-Dimensional Routing

I have created a route by hand using the Tracing Tool available in QGIS, placing the waypoint on top of an Open Street Map layer. I wanted to export all the coordinates to another program, so I saved ...
2
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0answers
1k views

GLONASS speed and altitude limitations

I'm looking for some info about the possible limitations for the GLONASS navigation system, something similar to the GPS COCOM limits. Is there any limitation on speed AND/OR altitude for this ...
2
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0answers
1k views

Determine lat/lon intersection on earth from point in space along 3d line

I have a known point in space with a lat,lon,alt. It has a camera with a line of sight and a angle of field of view. I can take the central point and calculate each corner vector of the field of view, ...
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0answers
106 views

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 ...
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0answers
50 views

Use of Airbus WorldDem altimetric values (EGM2008)

In France, the altimetric values are issued from a mesure of heights above the sea level based on the Marseille's tide gauge. If i didn't mess it up, the system is named NGF - IGN69 for mainland (See ...
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0answers
34 views

Faulty altitude point between contours

I have point(picket?) between 2 contour lines with even number altitudes. Now i got these new 5 meters steps contour in between. As you see, this point between red lines was OK, but now that this 175 ...
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0answers
330 views

How to include altitude using QGIS for field surveys capturing lat/long for utility locations?

I am using QGIS with a USB GPS to capture lat/long of utility locations. I have created a .csv file with a few fields e.g. address, cross st, id number, etc. and made it "editable". When I locate a ...
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0answers
701 views

Setting the correct zoom level from Sector bounds for flat map using WorldWind SDK

This is not coming out correct for me. Setting the zoom level based on some other code I got on here using the EarthFlat model, which does not set the correct zoom for the placemarks within a sector ...
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0answers
4k views

Calculating Accurate % Grade from GPS Coordinates

I am trying to calculate % Grade from GPS points. I am using the basic equation of (Rise/Run)×100 The problem is I am getting spikes in my GPS data (example 1 meter rise for 3 meter run), I am ...
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62 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 ...
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31 views

Get altitude through Trimble TDC 100 and Qfield

Good morning every one, 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 ( ...
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30 views

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 ...
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18 views

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 ...
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0answers
66 views

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 ...
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511 views

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, ...
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36 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?
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97 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,...