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The map images on the CD are digital scans of DLI (formerly DOLA) and Geoscience Australia’s (Royal Australian Survey Corps) 1:50,000 topographical and cadastral map series that covers part of South West W.A. When available, the DLI’s Topo/Cad maps (with 10m contour intervals) have been used but in areas where no coverage from this series was available, the RASC maps were used. The Survey Corp maps do not show cadastral (land boundary) data and have 20m contour intervals shown.
The maps have been scanned at 200dpi and then compressed to ECW format so that all the 283 maps could fit onto one CD. Each map sheet generally covers an area of 15' longitude by 15' latitude which corresponds to approximately 25km x 25km. Some combined sheets cover a slightly larger area.
The date when the original maps were first printed varies considerably but ranges from about the late 70’s to the late 90’s. Some are now out of print and unavailable for purchase. The maps are the most detailed available in digital raster format over this entire area and show all significant natural features (lakes, swamps, rivers, creeks, hills, coastal features etc) along with cultural features (tracks, roads, highways, towns, dams etc ) present at the time the data was collected for use to draft the maps.
The Maps on the CD has been specifically created for use with the popular OziExplorer GPS Mapping Software. Calibration files are included on the CD so users can start using the maps immediately. Calibration data is also supplied within the ECW files allowing geo-referencing data to be displayed while using other ECW viewing software (such as the ER Viewer supplied on the CD or ArcView) but the accuracy of this information is much lower than available when using OziExplorer.
Now compatible with Trackranger (GPS Mapping program like OziExplorer) and also most GIS programs (eg Arcview).
A place name database for use with OziExplorer is also provided allowing users to search for the location of named features that occur anywhere in WA. An OziExplorer compatible Index map also included.
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