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Mapping of Poa litorosa and Carex trifida in the Handspike Point area at Macquarie Island 28 March 2003

Entry ID: ASAC_1015_MIGPS03

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Summary

Abstract: Current positional data for Poa litorosa and Carex trifida at Handspike Point area (Macquarie Island) were collected using Global Positioning System (GPS) equipment and standard observational techniques. Different techniques were employed, depending on available expertise and equipment. These techniques are described in detail below. Areas were free from overhead obstructions and therefore ideally ...

Related URL

Link: GET DATA

Description: Download Carex trifida GPS data

Link: GET SERVICE

Description: RiSCC Biodiversity Database

Link: VIEW PROJECT HOME PAGE

Description: Public information for ASAC project 1015

Link: VIEW RELATED INFORMATION

Description: Citation reference for this metadata record and dataset

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

N: -54.5

S: -54.5

E: 158.89

W: 158.88

Temporal Coverage

Start Date: 2003-03-25

Stop Date: 2003-03-28

Location Keywords

OCEAN > SOUTHERN OCEAN

OCEAN > SOUTHERN OCEAN > MACQUARIE ISLAND

GEOGRAPHIC REGION > POLAR

Data Resolution

Latitude Resolution: 1 m
Longitude Resolution: 1 m

Science Keywords

BIOSPHERE > TERRESTRIAL ECOSYSTEMS > ISLANDS

BIOSPHERE > VEGETATION > INDIGENOUS VEGETATION

ISO Topic Category

BIOTA

Platform

FIELD SURVEYS

FIELD INVESTIGATION

Instrument

GPS > Global Positioning System

GPS RECEIVERS

Quality Current positional data for Poa litorosa and Carex trifida at Handspike Point area, Macquarie Island were collected using Global Positioning System (GPS) equipment and standard observational techniques. Different techniques were employed, depending on available expertise and equipment. These techniques are described in detail below. Areas were free from overhead obstructions and therefore ideally ... suited to GPS data collection.

The collection of positional data for Poa litorosa at Handspike Point, Macquarie Island, was undertaken on the 25th March 2003. Leica SR530 survey grade dual frequency receivers were utilised, operating in both rapid static and kinematic modes.

The receivers are capable of centimetre accuracies over 1-10 km baseline lengths. The survey was divided into two components. Firstly, three new permanent marker locations were surveyed using the rapid static GPS technique. These three permanent markers (metadata) serve as reference points. The GPS reference station for this survey was the Macquarie Island 'MAC1' GPS site which is part of the Australian Regional GPS Network (ARGN) (Twilley and Digney 2001). The datum for the survey was ITRF2000 expressed at epoch 2000.0. The three sites were observed multiple times over durations of 1-5 minutes with the observation rate set to 10 seconds. The second component involved the collection of positional data for individual Poa litorosa colonies. A kinematic GPS observation technique was utilized for this survey, enabling the operator to continually move the roving receiver around the delineation of each colony. The kinematic observations were recorded over a four hour period with several static initialization sessions throughout the survey. The observation rate was 10 seconds. Digital records (photographs and video footage) were also taken in conjunction with positional data, adding a substantial amount of information to mapped data.

Collection of positional data for Carex trifida at Handspike Point, Macquarie Island was undertaken on the 28th March 2003, using a Trimble GeoXT CE series handheld GPS unit. The GeoXT units are mapping grade, single frequency receiver capable of decimetre accuracies over short baselines (less than 5 km). The observation rate was between 30 and 60 seconds. The operator moved the roving receiver around the delineation of each colony. A Trimble ProXR receiver operating as a base station was used. At Macquarie Island it was positioned at the Macquarie Island ANARE Station on the isthmus. The baseline distance between the mobile receivers and field site was less than 5 km. The base station logged data at 5 second intervals.

The Leica SR950 data were post-processed using Leica SKI-Pro software (Leica Geosystems SKI-Pro Software 2002). Phase ambiguity resolution was successful for all data processed resulting in conservative accuracy estimates at the 5 cm and 10 cm level in both the horizontal and vertical components respectively. The GeoXT data were post-processed using Trimble GPS Pathfinder Office (2002). The estimated accuracy for the GeoXT data are at the 25 cm level in both the horizontal and vertical components. Results from both GPS processing suites were imported in Arc View (2002) and projected onto the Australian Map Grid.

The data collection was overseen by Dana Bergstrom of the Australian Antarctic Division and carried out by Paul Boland of DPIWE, Tasmania (Poa litorosa) and Perpetua Turner of the Australian Antarctic Division (Carex trifida).

Access Constraints The rover GPS data for Carex trifida, both uncorrected and differentially corrected data, is available for download from a Related URL.

The metadata record 'Macquarie Island survey, Voyage 6 March 2003' with Entry ID: survey_v6_2003 has links from which the following can be downloaded:
1 The differentially corrected Poa litorosa data in shapefile format; and
2 The base station data used to differentially correct the Carex trifida GPS data.

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=ASAC_101... when using these data.

Ancillary Keywords

ALTITUDE

CAREX

Data Set Progress

COMPLETE

Data Center

Australian Antarctic Data Centre, Australia

Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DAVE CONNELL Phone: +61 3 6232 3244 Fax: +61 3 6232 3351 Email: dave.connell 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 Size: 274 kb

Distribution Format: Trimble GPS

Fees: free

Personnel

DANA BERGSTROM

Role: INVESTIGATOR

Phone: +61 3 6232 3209

Fax: +61 3 6232 3351

Email: dana.bergstrom at aad.gov.au

Contact Address:

Australian Antarctic Division

203 Channel Highway

City: Kingston

Province or State: Tasmania

Postal Code: 7050

Country: Australia

PERPETUA TURNER

Role: TECHNICAL CONTACT

Role: DIF AUTHOR

Phone: +61 3 6232 3163

Fax: +61 3 6232 3351

Email: perpetua.turner at aad.gov.au

Contact Address:

203 Channel Highway

Australian Antarctic Division

City: Kingston

Province or State: Tasmania

Postal Code: 7050

Country: Australia

Creation and Review Dates

DIF Creation Date: 2004-12-09

Last DIF Revision Date: 2012-10-11

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