# Questions tagged [ecef]

Use this tag when referring to ECEF - earth centered, earth fixed when using a geographic coodinate system.

32 questions
Filter by
Sorted by
Tagged with
56 views

### Geodetic to ENU conversion

I am trying out geodetic to enu conversion. I tried this pymap3d's geodetic2enu function: import pymap3d as pm lat0 = 37.7749 # deg lon0 = -122.4194; # deg h0 = 10.0 # meters lat = 37.7750 # ...
• 111
1 vote
129 views

### Converting geodetic coordinates to ENU coordinates

I am trying to understand conversion from geodetic coordinates to ENU coordinates. As per this wikipedia page, its two step process: geodetic to ECEF coordinates and then ECEF coordinates to ENU ...
• 111
1 vote
139 views

### When do permanent RTK base stations need to update their advertised ECEF coordinates to account for continental drift?

I have recently setup an L1/L2 RTK base station in the UK, with the data served via rtklib, NTRIP and rtk2go.com. With a matching rover I am getting reliable 10mm fixes with excellent repeatability ...
• 191
1 vote
58 views

### Transform TEME TLE derived positions of a GPS satellite to the WGS84 coordinate system for comparison

I am trying to compare TLE derived x,y,z positions of a GPS satellite with those derived from precise GPS ephemerides (NGA). However, I am having some trouble getting the coordinate systems and ...
196 views

### Calculating ECEF position of gps satellite?

I am calculating the ECEF positions of satellites but the results are not what I expected.I'll show my code below but I'm following the gps specification(converting to radians from semicircles and the ...
167 views

### Difference in variation of ECEF X and Y data from GNSS

I am logging ECEF data from multiple GNSS receivers and notice that there is always more variance in the the Y (latitude) axis than in the X axis of a scatter plot. Attached is a plot showing the ...
1 vote
120 views

### Convert a body vector relative to an aircraft, to a vector in ECEF space

I am trying to solve for a problem where an observer is on an aircraft with a given pitch, roll, and yaw. The observer is looking at an object which produces a line of sight vector that is measured ...
• 111
3k views

### Converting Velocity ECEF to NED or LLA/Geodetic

I'm able to get a correct position from ECEF to Geodetic to NED with a relative footpoint and can verify using online conversion tools: https://www.oc.nps.edu/oc2902w/coord/llhxyz.htm https://www.ngs....
1 vote
462 views

### Converting from Lat Long Altitude to Geocentric to Topocentric using modern PROJ C++

I'm trying to use Proj to perform lat long alt to geocentric to topocentric transforms. I've been able to do this fine in python, but the API pyproj uses underneath is apparently very old. I want to ...
• 111
1 vote
2k views

### Relationship between ECEF and WGS84

What’s their relationship or difference? I’ve read that WGS84 uses ECEF, but they can be converted between one another. If not mistaken, they are both geographic coordinate systems and not projected ...
• 416
168 views

### Getting displacement in meters from "XYZ ECEF" or "NMEA" data

I am new to this field. I am working on a GNSS receiver that gives me live location data in NMEA and XYZ ECEF format. The receiver is mounted on my rover and I wish to use this data to get the rover's ...
• 101
610 views

### Transform height position from ECEF (EPSG:4978) to RH2000

I'm a novice regarding coordinate system and projections, and I'm trying to transform ECEF coordinates (projection adopted by Cesium) to the Sweref99 projection including the RH2000 height system (for ...
383 views

### Comparing two point clouds, one in WGS84 and the other in ECEF

I'm really a newbie and this task seems over my head. Suppose you have one cloud from LiDAR (a LAS file) with coordinates in WGS84 and another cloud, obtained from structure-from-motion, in ECEF. They ...
1 vote
854 views

### Import 3D tracking data in ECEF coordinates from a Google Earth Studio project as a layer of of points into a WGS 84 QGIS project

In addition to the rendered frames, Google Earth Studio has the option to generate a .jsx or a .json file with the 3D tracking information. (for information see https://earth.google.com/studio/docs/...
• 41
3k views

### What is the height reference point when using Longitude, Latitude , Height coordinates?

I'm using a library to convert LLH(WGS84) to ECEF coordinates. Does height (for corresponding longitude and latitude) denote height above/below the designated earth radius (I'm using 6378137.0m) or ...
• 173
967 views

### ECEF coordinates to geodetic coordinates: Where is error in calculation?

I know, there are several questions to this topic, but I am just searching for the error in my own equations. I have no deeper geodetic background, but I am trying to understand these formulas instead ...
• 73
1 vote
594 views

### ECEF elevation to LLH height

I have an ECEF position as: x: 1776694.9644800487, y: 5759463.252896432, z: 2079310.7706825584 Using some online ECEF to LLH converters, this value is transformed to: 19.152548, 72.855909, 8.00 I ...
• 153
542 views

### How can you convert between geographic data from and to 3D data in PostGIS?

Is there was a way to convert a geography value to a 3D geometry value (in ECEF, for example), and vice versa? I know how to convert between geography using a 2D projection, but not a 3D reference ...
1 vote
585 views

### Can we say ECEF datum like in Geodetic datum?

Commonly we use geodetic datum to describe the geoid, a distorted ellipsoid model of the Earth, but is it correct to say Earth-Centered Earth-Fixed (ECEF) datum? Because we are applying ECEF to a ...
• 125
3k views

### Treating latitude/longitude as a pair of polar coordinates

I have latitude longitude coordinates covering the whole globe that I wish to perform arithmetic operations (mean, interpolation) on without concern for ambiguous points and wrap around and without ...
10k views

### Local ENU point of interest to ECEF

I have a local ENU coordinate system on the surface of the Earth (similar to this question: GPS coordinates to XYZ on relative grid). I know the lat,lon,alt of the local ENU origin, and thus I can ...
• 123
955 views

### ECEF to relative displacement in meters

I have GPS NMEA (National Marine Electronics Association) data that I collected being stationary and I can see the displacement of 4 meters just by looking at GPX data uploaded to google maps. I am ...
• 103
5k views

### Units for LLA to ECEF conversion

I wish to implement this formula from Wikipedia to convert LLA to ECEF coordinates: where and a and b are the semi-major and semi-minor axes respectively. My question is: what units will this ...
• 105
1 vote
2k views

### Using local mean sea level (LMSL) as altitude for converting latitude longitude altitude to ECEF

I am new in Geographic area and would like to convert latitude and longitude coordinates into ECEF x,y coordinates so that I could do some linear calculation of line or circle equation. I was able to ...
• 113
219 views

### Using Tissot's Indicatrix Validate Conversion to ECEF

When using NED & ECEF as CRS: https://www.mathworks.com/help/map/ref/ned2ecef.html?requestedDomain=true Am I should worry from getting 'classical' projection issues? For example when x,y are ...
• 1,799
1 vote
706 views

### Parametric equation with latitude and longitude

I have an arc described by three points: arc center, starting point, ending point. In order to calculate intermediate points of the arc, I would normally use the parametrized equation. x(t) = x(...
• 135
1k views

### Using PROJ.4 to convert from 3D Cartesian ECEF coordinates to Lat/Long coordinates with inverse Icosahedral Snyder Equal Area (ISEA) projection

I have a set of X, Y, Z coordinates in the Earth Centered Earth Fixed (ECEF) geocentric system. I need to convert them from ECEF coordinates into Latitude/Longitude coordinates using an inverse ...
522 views

### Importing ECEF WGS84 into ArcGIS Desktop?

I have a file in ECEF WGS84 in meters. I want to import these points in ArcMap 10.5 as point layer. The file to import is in Excel format. I can import them with Excel to layer tool. I can see all ...
1 vote
796 views

### How can I project earth centered cartesian coordinates (EPSG:4978) to lat lon within Geoserver?

I have a PostGIS database with X, Y, and Z ECEF coordinates and I want to create a layer in Geoserver that displays these coordinates as points in OpenLayers. In Geoserver's create layer page there is ...
• 365
1 vote
1k views

### Perform Calculations in Cartesian Frame (NED/ECEF) Vs. Geodetic Frame

I'm recording robot's path (using INS) in Cartesian frame coordinates (x,y,z) relative to origin point. So essentially I've created NED coordinate system. Origin point has exact (in advance measured) ...
• 1,799
8k views

### How much error should occur when converting WGS84 to ECEF coordinates?

The method is not recommended for distances larger than 4km. I am getting reasonable accuracy in terms of the east and north bearings, but for the up direction I am getting error upwards of 1km for ...
• 121