AHD meaning in Earth Science ?

Answer: What is Australian Height Datum mean?

The Australian Height Datum was introduced in 1971 as the official vertical datum for Australia, and thereby serves as the benchmark to which all height measurements are referred. The Australian Height Datum is an amalgamation of decades of spirit levelling work conducted by numerous state and territory authorities across the country, and was corrected to align with the mean sea level observations of thirty tide gauges positioned around the entire coastline. While it still remains the published vertical datum for all surveying and engineering operations performed throughout Australia, newer technologies have uncovered numerous deficiencies, offsets and distortions within the Australian Height Datum, leading to discussions about defining a new Australian vertical datum.

reference

Full Form	Category
Academic Honors Diploma	Business
Arehada Mining Limited	Business
Amalgamated Holdings Ltd	Business
Argon High Density	Chemistry
Amber Helm Development	Community
Association for Humanitarian Development	Community
Affordable Housing Developers	Community
Affordable Housing Database	Computing
Automate Help Desk	Computing
Audio Hardware Driver	Computing
Australian Height Datum	Earth Science
At Home Dads	General
ANC1 Homology Domain	General
Along Hole Depth	General
Acquired Hepatocerebral Degeneration	General
Administrative Hearings Division	General
Attack Hold Decay	General
Acoustic Hailing Device	General
Analog High Definition	General
Advanced Help Desk	General
Acieries Hachette Driout	General
Analogue High Definition	General
American Heritage Dictionary	General
Animal Husbandry Department	General
A Harmless Deed	General
Audio High Density	General
AHERWADI	Indian Railway Station
Advance Health Directive	Medical
Attention Hyperactive Disorder	Medical
American Hospital Directory	Medical
American Health Decisions	Medical
Atherosclerotic Heart Disease	Medical
Adenovirus Hemorrhagic Disease	Medical
Academic Health Department	Medical
Additional Health Data	Medical
Arteriosclerotic Heart Disease	Medical
Autoimmune Hemolytic Disease	Medical
Analyzing Hospitalization Data	Medical
Alveolar Hydatid Disease	Medical
Advanced Hardware Development	Military and Defence
Anti-handling Device	Military and Defence
Advance Help Desk	Softwares