This is an app to check the 2024 geoid height value in Japan and the previous value (2011).

Enter the latitude and longitude and use the Calc button to calculate.
*Units are latitude and longitude in decimal notation (e.g. 35.12345678)

Alternatively, load a text file containing a list of latitudes and longitudes,
From that file, you can generate a list of geoid heights.

The text file for input is compatible with Geoid 2024 of the Geospatial Information Authority of Japan.
Forms compatible with the "Geoid Height Calculation Program" are available.
*Units are latitude and longitude in decimal notation (e.g. 35.12345678)
[Link to reference information]
https://www.gsi.go.jp/butsuri/data/manual_GSIGEO2024beta.pdf

Calculation results can be shared externally via email, messaging apps, etc.

*In preparation for the geoid height in Japan being updated to the 2024 version,
A simple calculation app that allows you to easily check old and new values.

*As soon as the official Geoid Model 2024 is released by the Geospatial Information Authority of Japan,
This will be addressed in a future update, so please be careful when trying it out.
(As of January 2025, the first version is the trial version of Geoid Model 2024)