At this scale 1cm on the map represents 1km on the ground. Each map covers a minimum area of 0.5 degrees longitude by 0.5 degrees latitude or about 54 kilometres by 54 kilometres. The contour interval is 20 metres. Many maps are supplemented by hill shading. These maps contain natural and constructed features including road and rail infrastructure, vegetation, hydrography, contours, localities and some administrative boundaries. Product Specifications Coverage: Australia is covered by more than 3000 x 1:100 000 scale maps, of which 1600 have been published as printed maps. Unpublished maps are available as compilations. Currency: Ranges from 1961 to 2009. Average 1997. Coordinates: Geographical and either AMG or MGA coordinates. Datum: AGD66, GDA94; AHD Projection: Universal Transverse Mercator UTM. Medium: Printed maps: Paper, flat and folded copies. Compilations: Paper or film, flat copies only.

Geoscience Australia`s involvement in Papua New Guinea mapping includes managing the production of maps for select urban areas as part of a MOU between Department of Defence and PNG. In addition, Geoscience Australia distributes some (now aging) 1:100,000 scale maps produced by the Department of Defence for much of Papua New Guinea. At this scale 1cm on the map represents 1km on the ground. Each map covers a minimum area of 0.5 degrees longitude by 0.5 degrees latitude or about 54 kilometres by 54 kilometres. The contour interval is 20 metres. Many maps are supplemented by hill shading.

Geoscience Australia`s involvement in Papua New Guinea mapping includes managing the production of maps for select urban areas as part of a MOU between Department of Defence and PNG. In addition, Geoscience Australia distributes some (now aging) 1:100,000 scale maps produced by the Department of Defence for much of Papua New Guinea. At this scale 1cm on the map represents 1km on the ground. Each map covers a minimum area of 0.5 degrees longitude by 0.5 degrees latitude or about 54 kilometres by 54 kilometres. The contour interval is 20 metres. Many maps are supplemented by hill shading.

D53/B1-250 Vertical scale: 10

H55/B1-48 Vertical scale: 50

D53/B1-186 Contour interval: 10

60% coverage, central east missing D53/B1-195 Contour interval: 10

H55/B1-56 Vertical scale: 25

No abstract available

Niue Island, in the south Pacific Ocean, is a raised coral atoll with an area of 259 km^2. The original atoll rim is preserved as a peripheral ridge about 60 m above sea level, and the original lagoon floor now forms an internal basin about 35 m above sea level. Drilling has proved limestone of Miocene age to a depth of more than 200 m. Gravity and magnetic surveys indicate that the limestone probably overlies volcanic bedrock at a depth of about 300 m below sea level. The classical Ghyben-Herzberg freshwater lens does not exist on Niue Island. Results of electrical resistivity depth probes indicate that in the centre of Niue the freshwater layer is 40-80 m thick and beneath the former atoll rim it is 50-170 m thick. It decreases to 0 within 500 m of the coast, where salt water mixing occurs along fissures in the limestone. The irregular configuration of the freshwater layer is ascribed to permeability differences in the limestone. Considering the recharge conditions on Niue, the safe yield of a freshwater layer 50 m thick would be about 4000 m^3 of groundwater per year per hectare. Aquifer tests on two specially constructed bores indicate specific capacity (yield-to-drawdown ratio) of about 12 I/s per metre of drawdown, and a safe long-term pumping rate of about 8 I/s.