Consolidated dataset of hydrographic surveys at Macquarie Island, 1999-2019, ITRF2000

Brief description

The AADC (Australian Antarctic Data Centre) is in the process of converting all internally held spatial datasets to the ITRF2000 horizontal datum. This consolidated dataset consists of surveys HI623_alatB_gg, HI625_alatB_GG, HI632_alat_B_gg, HI632_alat_C_gg, LADSII_MMI20756_HSDB_T0001_SD_100029052_op, LADSII_MMI20756_HSDB_T0001_SD_100029053_op, LADSII_MMI20756_HSDB_T0001_SD_100029054_op converted to ITRF2000 horizontal datum with Z conversion values for multiple height datums. The data was provided to the AAD by Paul Digney of Jacobs consulting in March 2021.

Included survey datasets:
• HI623_alatB_gg
• HI625_alatB_GG
• HI632_alat_B_gg
• HI632_alat_C_gg
• LADSII_MMI20756_HSDB_T0001_SD_100029052_op
• LADSII_MMI20756_HSDB_T0001_SD_100029053_op
• LADSII_MMI20756_HSDB_T0001_SD_100029054_op

All data are in horizontal datum ITRF2000 and have been combined into a single ESRI geodatabase feature class titled AHS_Surveys_Macca_ITRF2000.

Attribute data shows quality information, conversion factors (shift in metres) for multiple datums and the MSL orthometric height:

Column Name Alias Meaning
Easting Easting Easting ITRF2000
Northing Northing Northing ITRF2000
LAT_to_GRS LAT_to_GRS LAT (Chart Datum) to GSR80
LAT_to_Mac LAT_to_Mac LAT to Macca MSL
Z_To_GRS80 Z_To_GRS80 Height to the Ellipsoid
Z_To_Macca Z_To_Macca Local MSL orthometric height
Vertical_U Vertical_U How good is the Vertical Position
Horizontal Horizontal How good is the Horizontal Position
Uncertaint Uncertaint Uncertainty Comments
Depth_Comm Depth_Comments

Vertical uncertainty ranges from 0.5 to 1.2 m and horizontal uncertainty ranges from 2 to 5.5 m. Null values indicate unknown uncertainty.

See the attached document ‘Metadata_Record_Macqaurie Island Final.xlsx’ for further details.