Skip to main content

Questions tagged [egm96]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
0 answers
47 views

Converting vertical datum of Lowest Astronomical Tide (LAT) to EGM96

I want to model the impact of sea level rise (SLR) on the coast zone of an Asian country using a modified bathtub model. The SLR projections include AR6 results and extreme sea level (ESL) by high ...
Yuxuan Ye's user avatar
2 votes
1 answer
330 views

How to convert DEM with vertical DATUM DHHN2016 height EPSG:7837 to EGM96 height - EPSG:5773?

There is a lidar data source of digital elevation model of Germany. The spec of the lidar data is: Horizontal CRS: EPSG 25832 Vertical DATUM: EPSG 7837 I have anther DEM whose vertical datum is ...
Lion Lai's user avatar
  • 258
5 votes
2 answers
1k views

Convert Vertical Datum of GDAL file

I have 2 DTM datasets, the first has a vertical datum of WGS84, while the second has an orthometric vertical datum (maybe EGM96). gdalinfo seems to only provide the horizontal datum info: Size is ...
Daniel C Jacobs's user avatar
0 votes
0 answers
164 views

NAVD88 not in Vertical Reference drop down list of Drone2Map

I use the Propeller company's Aeropoint GPS tiles to collect ground control for drone flights. When trying to import my ground control points, the survey report provides the coordinate reference ...
Angie's user avatar
  • 21
1 vote
1 answer
1k views

How to get the EGM96 and EGM2008 elevations of a list of WGS84 lat/lng coordinates from a file using GDAL?

I'm trying to do the following: Given a list of WGS84 latitude / longitude pairs in a text file (one pair per line), I'd like to compute the EGM96 and EGM2008 elevations corresponding to those points ...
TCSGrad's user avatar
  • 141
3 votes
0 answers
128 views

What's this 8 byte "padding" in the EGM2008 data?

I recently downloaded the 1' earth gravitational model 2008 Und_min1x1_egm2008_isw=82_WGS84_TideFree dataset from here. According to the readme, the file consists of 233,301,600 32-bit floating point ...
Benny Jobigan's user avatar
0 votes
1 answer
854 views

Are WGS84 LatLon coordinates and EGM96 LatLon coordinates the same and difference for [LatLonEle] is elevation only?

Does WGS84 LatLon coordinates and EGM96 LatLon coordinates are the same? Is difference for [Lat;Lon;Ele] is in elevation only? If I have, for example, a [Lat;Lon] point in WGS84, I can take ...
filimonic's user avatar
  • 153
8 votes
4 answers
3k views

How does a Spatial Reference System like WGS84 have an elipsoid and a geoid?

I found out that WGS84 is an ellipsoid with a "geoid component", but I'm unsure exactly how that can be. This is from PostGIS in Action, Second Edition (pg. 64), but it seemed a bit vague. ...
Evan Carroll's user avatar
  • 7,091
6 votes
3 answers
546 views

Vertical datum query for coastal modeling

I have a USGS derived DEM with a vertical datum of EGM96 from NASA satellite data. My Bathymetry uses a lowest astronomical tide datum. Has anybody come across this or similar issue before? I need ...
SPG's user avatar
  • 191
17 votes
3 answers
40k views

How are EGM96 and WGS84 related to each other?

As far as I understand the EGM96 defines the Geoid, where as the WGS84 Standard defines the Ellipsoid. Is the ellipsoid defined in the WGS84 standard defined in a way to maximize the congruency with ...
oschrenk's user avatar
  • 643