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Global Change Master Directory (GCMD)
Macquarie Island AIRSAR DEM (Digital Elevation Model)
Entry ID: macca_dem_gis


Summary
Abstract: A digital elevation Model (DEM) of Macquarie Island with a five metre grid interval, and held in UTM Zone 57 , WGS 84 coordinates. Heights are referenced to mean sea level. 5 metre contours to the 5 metre level were derived.

This metadata record is related to the metadata record Macquarie Island and adjacent islands 1:50000 Coastline GIS Dataset.

The DEM was improved by Dr Michael Roach, Lecturer in Geophysics, School of Earth Sciences - CODES, University of Tasmania, Hobart, Tasmania, Australia and a copy provided to the Australian Antarctic Data Centre in January 2006. This improved version is the dataset available for download.

Details about the processing done by Dr Roach are available from the link below.

Related URL
Link: View Related Information
Description: DEM derived from AIRBORNE Synthetic Aperture Radar images acquired on August 16, 2000 (ArcInfo interchange file)


Link: View Related Information
Description: Macquarie Island AIRSAR DEM (Digital Elevation Model)


Link: View Related Information
Description: Related Metadata: Search for "Macquarie Island georeferenced satellite image negative 1:200 000"


Link: View Related Information
Description: NASA Airborne Synthetic Aperture Radar


Link: View Related Information
Description: Download further documentation for the DEM


Link: View Related Information
Description: Processing information for Macquarie Island satellite image data


Link: View Related Information
Description: Citation reference for this metadata record and dataset


Link: View Related Information
Description: Macquarie Island AIRSAR DEM (Digital Elevation Model)

Geographic Coverage
 N: -54.47483 S: -54.78643  E: 158.96393  W: 158.76343

Data Set Citation
Dataset Creator: Brolsma, H.
Dataset Title: Macquarie Island AIRSAR DEM (Digital Elevation Model)
Dataset Series Name: CAASM Metadata
Dataset Release Date: 2006-05-12
Dataset Publisher: Australian Antarctic Data Centre
Version: 2
Online Resource: https://data.aad.gov.au/metadata/records/macca_dem_gis


Temporal Coverage
Start Date: 2000-08-16
Stop Date: 2002-02-01


Location Keywords
OCEAN > SOUTHERN OCEAN
OCEAN > SOUTHERN OCEAN > MACQUARIE ISLAND
GEOGRAPHIC REGION > POLAR


Science Keywords
LAND SURFACE >TOPOGRAPHY >TERRAIN ELEVATION >CONTOUR MAPS    [Definition]
LAND SURFACE >TOPOGRAPHY >TERRAIN ELEVATION >TOPOGRAPHICAL RELIEF MAPS    [Definition]
LAND SURFACE >TOPOGRAPHY >TERRAIN ELEVATION    [Definition]


Platform
Aircraft    [Information]
SATELLITES    [Information]
Aircraft    [Information]
SPOT-3 >Systeme Probatoire Pour l'Observation de la Terre-3    [Information]


Instrument
AIRSAR >Airborne Synthetic Aperture Radar    [Information]


Quality
The Australian Antarctic Division (AAD) DEM is based on a DEM produced by Horizon Geoscience Consulting Pty Ltd (HGC) from AIRBORNE Synthetic Aperture Radar images acquired on August 16, 2000 by NASA PACRIM Mission 2. Heights in the AAD DEM were referenced to Mean Sea Level.

The HGC DEM was processed as follows:

1. AAD AIRSAR Mosaic - processed TOPSAR DEM and C-band VV-data files from mosaic of AIRSAR scenes TS1197 and TS1188. Data were acquired on 16th August 2000. DEM data from each scene were mosaicked to minimize the loss of data from the effect of radar shadow. C-band VV-polarization brightness data are also mosaicked because the phase information used to generate the DEM are acquired from the C-band VV-polarization signals.

2. AAD SPOT - processed images from SPOT PAN/MSS scene recorded on 22nd December 1994 and supplied by AAD.

3. AAD TS1188 - processed images from AIRSAR flightline Macquarie 13-1 acquired on 16th August 2000. Data were acquired in a south-to-north direction with the AIRSAR antenna sytem looking west towards the island. Therefore can expect east-facing steep slopes preferentially oriented towards the incident signals to be very bright and often saturated while west-facing slopes may be in radar shadow with no signal available.

4. AAD TS1197 - processed images from AIRSAR flightline Macquarie 193-1 acquired on 16th August 2000. Data were acquired in a north-to-south direction with the AIRSAR antenna sytem looking east towards the island. Therefore can expect west-facing steep slopes preferentially oriented towards the incident signals to be very bright and often saturated while east-facing slopes may be in radar shadow with no signal available.

5. ArcView Contour Files - contour files ready for displaying in an Arc environment. Contours have been generated for 5 metre intervals for a height range of 5 to 410 metres. Refer to the metadata record 'Macquarie Island contour data derived from Airborne Synthetic Aperture Radar images captured August 2000' for a link to download the contour data.

Processing of the AIRSAR data.

1. Radiometric corrections - each strip had the following processing sequence applied:

a. Masking to remove null values including out-of-range Finite values, Non-Numbers and Infinite Values.

b. Antenna pattern correction to normalize the intensity across the swath from near to far range.

c. Adaptive filtering to suppress speckle and electronic noise in the data.

2. Geometric corrections:

a. Radiometrically-corrected data were rotated to be aligned to the direction of acquistion - ie 13 and 193 degrees.

b. Using the locator information collected during the acquisition phase by on-board precision navigational systems including INS and EGI instruments, the data were further rotated, scaled and transformed using a 1st order polynomial fit to a Universal Transverse Mercator projection (Zone 57 South) and WGS 1984 Horizontal Datum. Comparison of the processed data with the geolocated SPOT imagery (rescaled to 5 metre pixel resolution) demonstrated a 1-to-1 correlation.

The DEM is for Macquarie Island only and does not include Judge and Clerk or Bishop and Clerk islands.

Usually mapped to a Universal transverse Mercator projection, zone 57, units metres, spheroid GRS80, Datum WGS84.


Access Constraints
The DEM is stored in ERMapper format.
It is available for download in ArcInfo interchange or ArcInfo ascii formats.

Further documentation about the DEM is also available for download at the provided URL.


Use Constraints
This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).

Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=macca_de... when using these data.


Keywords
AIRSAR
CONTOURS
DEM
GIS
DIGITAL ELEVATION MODEL
MACQUARIE ISLAND
SPOT


Data Set Progress
COMPLETE


Originating Center
Australian Antarctic Division


Data Center
Australian Antarctic Data Centre, Australia    [Information]
Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DATA OFFICER AADC
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: metadata at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia



Distribution
Distribution_Media: HTTP
Distribution_Format: shapefiles, word, text
Fees: free


Personnel
HENK BROLSMA
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia


Extended Metadata Properties
(Click to view more)

Creation and Review Dates
DIF Creation Date: 2002-02-19
Last DIF Revision Date: 2019-01-25



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