Fisher Massif Mapped from Landsat 7 Imagery.Entry ID: LANDSAT_FISHER_FEATURES
Abstract: Fisher Massif Features Mapped from Mosaiced Pan Sharpened Landsat 7 Imagery.
An unsupervised classification was run on the final image to create an image with 12 distinct grey scale values. An automated feature extraction process was then performed in ERDAS to automatically select and extract areas of Rock and Snow. These areas were then compared with the true colour image mosaic ... and the boundaries were manually adjusted where necessary. All other feature types were mapped in ESRI's ArcGIS by manually tracing along and around features using a stream digitising technique. Relevant linear features were then polygonised.
The accuracy of the mapping was within +/- 30m for 95% of mapped features. This is a relative accuracy as there were no control points available to provide an absolute image orientation.
The datasets were converted to double precision ArcInfo Coverages in UTM Zone 42. ESRI?s ArcGIS Desktop and Workstation were used to process the vector data.
The Rock and Snow features which had been automatically extracted from the image were generalised using a distance of 40m with the bend simplify option of remove redundant vertices. The lines were then splined with a grain tolerance of 20m to smooth them.
The line feature coverages were cleaned with a tolerance of 0.1m. ArcEdit was then used to tidy the line work in the resultant coverage. Arcs were extended where required and overshoots were deleted. The resultant coverages were built for line and polygon topology.
The polygons were attributed using the Landsat image as a backdrop. The features were then extracted into separate feature coverages. The data were attributed according to the AADC Feature Type Catalogue. The individual feature coverages were built and checked for errors. A further visual check was then performed to check the features corresponded to the image.
The absolute accuracy of the features mapped is +/-280m, with a relative accuracy of +/-30m.
The individual feature coverages were projected to Geographicals (WGS84).
After discussions with Mike Verrier, from the AAD on 30 April 2003, it was decided that ridgelines would only be picked up where there were major variations in the surface and not where there was a small hollow in which snow was settling.
Data Set Citation
Dataset Originator/Creator: Harris, U.
Dataset Title: Fisher Massif Mapped from Landsat 7 Imagery.
Dataset Series Name: CAASM Metadata
Dataset Release Date: 2003-08-25
Dataset Publisher: Australian Antarctic Data Centre
Version: 1Online Resource: https://data.aad.gov.au/metadata/records/LANDSAT_FISHER_FEATURES
Start Date: 1999-12-27Stop Date: 1999-12-27
Latitude Resolution: 30 Metre(s)
Longitude Resolution: 30 Metre(s)
Quality The data were mapped from a Pan sharpened Mosaiced Landsat 7 Image. An automated feature extraction process was performed in ERDAS to automatically select and extract areas of Rock and Snow. These areas were then compared with the true colour image mosaic and the boundaries were manually adjusted where necessary. All other feature types were mapped in ESRI's ArcGIS by manually tracing along and ... around features using a stream digitising technique. The mapped data were converted to ArcInfo coverages. Coverage clean up and editing was performed using ArcEdit and ArcInfo. The coverages were built for lines and polygons. Attribute assignment and management was performed using ArcMap and conforms to the Feature Type Catalogue. The digitised data were mapped in UTM Zone 42 (WGS84) and converted to Geographicals on WGS84. The Relative accuracy of the mapped features is +/-30m. The absolute accuracy of the referenced Landsat 7 imagery is +/-250m. Hence the absolute accuracy of the mapped data are +/-280m.
Access Constraints Data available via the web as shapefiles (refer to links).
Use Constraints This data set conforms to the CCBY Attribution License
Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=LANDSAT_... when using these data.
Data Set Progress
Distribution Media: HTTP
Distribution Size: 16 MB
Distribution Format: shapefiles
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: +61 3 6232 3519
Fax: +61 3 6232 3351
Email: gis at aad.gov.au
Australian Antarctic Division 203 Channel Highway
Province or State: Tasmania
Postal Code: 7050
Extended Metadata Properties
(Click to view more)
Creation and Review Dates
DIF Creation Date: 2003-08-25
Last DIF Revision Date: 2019-04-08