June, 1999 (Vol. 28, No. 1)
Refereed Papers
Metternicht, G.I. (1999) Current Status and Future Perspectives of Radar Remote Sensing for Cartographic Applications, Cartography, Vol. 28, No. 1, pp. 1 - 17.
Featherstone, W., Galloway D., Goulding P. and Reit, B.G. (1999) Transformation Between Australian Datums Using a Modified Transverse Mercator Projection, Cartography, Vol. 28, No. 1, pp. 19 -31.
Chong, A.K. (1999) Orthoimage Mapping Bases for Hybrid, Multimedia, and Virtual Environment GIS
, Cartography, Vol. 28, No. 1, pp. 33 - 41.
Current Status and Future Perspectives of Radar Remote Sensing for Cartographic Applications.
Graciela I Metternicht
School of Spatial Sciences
Curtin University of Technology
GPO Box U 1987
Perth 6845, Western Australia
Abstract
The use of radar satellite sensors for environmental mapping and resource management has been the subject of much investigation in recent decades. Following the
introduction of space-borne Synthetic Aperture Radar in the 1990s (ERS1/2, JERS-1, ALMAZ, Radarsat), much research has been conducted on detecting and
assessing features related to forest, agriculture, wetlands, rangelands, land cover inventory, and urban and topographic mapping.
This paper presents a brief historical review on radar developments, with an overview of the characteristics of the radar systems that are currently operational. After
presenting several examples of existing and potential SAR applications in fields such as agriculture, forest, land degradation, urban and topographic mapping, and
monitoring tasks, the paper concludes with some research issues, trends and developments in the use of radar imagery for mapping purposes.
Transformation Between Australian Datums Using a Modified Transverse Mercator Projection
Will Featherstone, Dominic Galloway and Phil Goulding
School of Spatial Sciences
Curtin University of Technology
GPO Box U1897 Perth WA 6845 Australia
Bo-Gunnar Reit
Geodetic Research Division
National Land Survey
SE-801-82 Gävle Sweden
Abstract
The introduction of the Geocentric Datum of Australia (GDA94) in the year 2000 will undoubtedly require the transformation of a large amount of coordinate data in
Australia. This paper presents a modified transverse Mercator (MTM) map-projection such that the latitude and longitude on one datum are projected so that they
closely agree with the transverse Mercator easting and northing on another datum. This approach will allow the introduction of the GDA94 whilst preserving Australian
Map Grid (AMG) coordinates. Conversely, the MTM projection can be used to transform coordinates directly from the Australian Geodetic Datum (AGD) to the new
Map Grid of Australia (MGA94). In order to test these two approaches, MTM parameters have been computed from 82 co-located GDA94/MGA94 and
AGD98/AMG84 coordinates that comprise the Western Australian STATEFIX geodetic network. When using the national seven- and three-parameter datum
transformations, the maximum differences between observed and transformed coordinates are 2.04m and 2.21m, respectively. When using the transformation by MTM
projection, the projected coordinates agree with the observed coordinates to less than 2.04m.
Orthoimage Mapping Bases for Hybrid, Multimedia, and Virtual Environment GIS
Albert K Chong
Department of Surveying
University of Otago
Dunedin, New Zealand
Abstract
Recently, there has been an increase in the number of discussions on the usage of digital image maps in multimedia GIS and virtual environments. There are a number of
factors which have made digital image maps superior to conventional cartographic maps or equally acceptable for the role of a GIS mapping base.
In this paper, benefits of digital image mapping bases for GIS are discussed. Additionally this paper includes a discussion of the impact of recent developments in three
dimensional real world object display, virtual reality and multimedia approaches in GIS, and examines the potential of an image mapping base implementation.
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