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OSNI Open Data - BenchMarks - Height provides point data showing the location of survey benchmarks and their associated height values in metres above mean sea level. The dataset is published by the Government Digital Service for OpenData under an Open Government Licence. The data is not maintained, and users are advised to use a Global Navigation Satellite System (GNSS) and the latest geoid model for orthometric height in Northern Ireland.
Users must agree to abide by the LPS Open Government Data License. The Esri Rest API endpoint will not open directly in a web browser but can be used in desktop and web mapping applications.