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Cape Denison and McKellar Islands GIS dataset from Ikonos satellite imagery

Entry ID: gis41

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Summary

Abstract: A GIS dataset of around Cape Denison and part of George V land created from two IKONOS satellite images.
Layers created from digitising directly from the imagery include: mapping extent, continent, building, refuge, coastline, reef, offshore rocks, sea, snow, sheet, island, birds, rock, moraine, sea ice, lakes
- The mapping extent layer represents the edge of the IKONOS imagery.
- The continent ...

Related URL

Link: GET DATA

Description: Download point for the shapefiles

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

N: -66.9

S: -67.1

E: 143.1

W: 142.5

Temporal Coverage

Start Date: 2001-01-26

Stop Date: 2001-01-31

Location Keywords

CONTINENT > ANTARCTICA > Cape Denison

GEOGRAPHIC REGION > POLAR

Data Resolution

Latitude Resolution: 1 metre
Longitude Resolution: 1 metre

Science Keywords

LAND SURFACE > TOPOGRAPHY > LANDFORMS

ISO Topic Category

ELEVATION

IMAGERY/BASE MAPS/EARTH COVER

Platform

IKONOS

Quality The data were digitised from two IKONOS 1 metre Pan sharpened Multispectral images. The image reference numbers were 2001013123204820000011627275 and 2001012623380410000011623143. The images were supplied as georeferenced band interleaved by line (BIL) multiband image files. Features were digitised in ArcMap version 8.1 as shapefiles and converted to ArcInfo coverages using ArcInfo version 8.1. ... Coverage clean up and editing was performed using ArcEdit and ArcInfo version 8.1 commands. Attribute assignment and management performed using ArcMap and ArcView 3.2.

- The frame line represents the edge of the IKONOS image and was digitised directly from the image.

- The Continent polygon was formed using the coastline digitised from the images and bounded by lines representing the edge of the images.

- Buildings were located using spatial information provided by Ursula Ryan and visual identification by Henk Brolsma.

- Refuges were visually identified by Henk Brolsma.

- Coastline was tagged as being either rock or ice as identified from the imagery.

- The reefs were difficult to confidently identify from the IKONOS imagery and in many cases it was difficult to distinguish between wave action and actual reef. An area bounded by 67 degrees 01 minutes South, 66 degrees 57 minutes South, 142 degrees 36 minutes East and 142 degrees 42 minutes East was scanned with care at 1:2,000 scale and anything that appeared to be a reef at that scale was captured as approximate reefs. There are an infinite number of small white objects that appear at larger scales. It was not possible to distinguish if these were rocks/reefs or waves. There was no value in capturing them all as this would indicate that the whole area was covered by regularly spaced reefs. Definite reefs were assigned a class value of DEFINITE and others were assigned a class value of APPROXIMITE. There is no guarantee that all the reefs in this area have been located or that the digitised approximate reef features are in fact reefs.

- The sea polygon was formed using the coastline digitised from the images and bounded by lines representing the edge of the images. Island reef and offshore rock features were removed from this sea polygon to create holes.

- Snow and ice polygons were digitised using image analysis techniques in Erdas Imagine. The highly detailed snow/ice shapefiles created by Erdas were converted to Arc/Info coverages and cleaned to remove the excess noise created by the image processing techniques. Fuzzy tolerances of up to 3 metres and dangle tolerances of up to 20 metres were used. Inland snow areas and islands of less than 1000 square metres were also removed to reduce the vast number of isolated drifts. The hand digitised coastline was integrated with the snow polygons to ensure consistency between layers. The edges of some large polygon areas were hand digitised to reduce the complexity of the automatically generated linework.

The digitised data and imagery were georeferenced to UTM Zone 54 (WGS84) and converted to unprojected coordinates on WGS84 using the Arc/Info project command.

- Penguin colony polygons were digitised from the images. Data were checked and corrected by Eric Woehler, Ornithologist, AAD. Additional colonies on the continent and on the Mackellar Islands were supplemented from aerial photography taken in 2001/02 by MacIntyre expedition.

In April 2010 the coastline near Lands End was edited, a reinterpretation of the satellite image prompted by feedback from Chris Henderson, an expeditioner to Cape Denison with the Mawson's Huts Foundation in 2008/09 and 2009/10. This editing resulted in changed coastline, continent, island, offshore rock and rock data.

Usually mapped to a Universal Transverse Mercator projection, Zone 54.

Access Constraints Stored data format: ArcView shapefiles
Available format type: ArcView shapefiles. Stored as geographicals with a projection file.
Access constraint: ArcView shapefiles are available on the web. Refer to the URLs below. Conditions apply.

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 the URL below when using these data.

Ancillary Keywords

ANTARCTICA

CAPE DENISON

Data Set Progress

COMPLETE

Originating Center

Consultants to AADC

Data Center

Australian Antarctic Data Centre, Australia

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

Fees: free

Personnel

URSULA HARRIS

Role: INVESTIGATOR

Role: TECHNICAL CONTACT

Phone: +61 3 6232 3519

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

ANGELA BENDER

Role: DIF AUTHOR

Phone: +61 3 6232 3246

Fax: +61 3 6232 3351

Email: gis at aad.gov.au

Contact Address:

Australian Antarctic Division

203 Channel Highway

City: Kingston

Province or State: Tasmania

Postal Code: 7050

Country: Australia

Creation and Review Dates

DIF Creation Date: 2002-09-02

Last DIF Revision Date: 2010-04-16

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