Base Layers for QLD TOM2 Map

May 20, 2012

Data, Geospatial

The Queensland Department of Community Safety (DCS) Total Operational Mapping (TOM2) map service is available to several thousand internal DCS staff, by typing “TOM” into their browsers in the internal DESPortal. TOM2 includes a variety of options for background layers.

[Note: The screen clips were taken during the initial rollout, the appearance of the viewer has changed slightly with the upgrade to TOM2.1 in March 2011 ]

Choosing a base layer

When the TOM2 Geocortex map viewer is first opened, a pre-selected base layer will be active . To select a different background click the small arrow next to the active layer which opens a drop down menu. The ‘best’ choice of background map is often a matter of personal preference, experience and user requirements. This may vary depending on the scale at which you are viewing the map and which other operational layers you display on top of the base-map.

Figure 1 Background Map Layers in TOM2

It is also possible to keep more than one base map can be visible at a time and use the toggles to change the transparency.

Figure 2 Changing base layers and transparency

The map backgrounds in TOM2 come from a variety of sources and are described below.

Background Map Layers with World Extent data

1. Aerial with Labels (Bing)

Bing Maps (previously MSN Virtual Earth) is a web mapping service provided as a part of Microsoft’s Bing suite of search engines. The Microsoft Bing Maps Web Map Services Worldwide orthographic aerial and satellite imagery is made available through ESRI Australia Pty. Ltd., using the Amazon Elastic Compute Cloud (EC2). Bing Maps imagery is provided by a variety of partners.

Figure 3 Aerial with Labels (Bing)

2. Street Map (Bing)

Within TOM2 users can browse and search Bing’s worldwide topographically-shaded street maps. Maps include certain points of interest built-in, such as metro stations, stadiums, hospitals, and other facilities. TOM2 displays Bing Road View vector imagery of roads, buildings, and geography.

Figure 4 Street Map (Bing)

3. Street Map (MDS)

Street Map is an external web mapping service provided by Map Data Services (MDS). The MDS Foundation Map is a ready-to-use cached map service with street information from the Public Sector Mapping Authority (PSMA).

Background Map Layers with Australian Extent Data

1. Topographic 250,000

The 1:250,000 Topographic base layer is based on 514 map sheets from NATMAP Digital Maps 2008 (previously NATMAP Raster) from Geoscience Australia joined into a seamless digital map mosaic based on GDA94 geographic projection. At this scale 1cm is equal to 2.5km. The maps have a horizontal accuracy of approximately +/-140 metres. The data in the 1: 250K Topographic maps has been revised using a variety of government and private data sources including Single Point of Truth (SPOT) and Landsat satellite imagery, other government agency information and data supplied by private companies and individuals. These maps contain natural and constructed features including road and rail infrastructure, vegetation, hydrography, contours (with intervals of 50m), localities and some administrative boundaries. Some maps are supplemented by relief shading.

Figure 5 Base Layer: 250K Topographic map layer from Geoscience Australia

2. World Aeronautical Charts (WACs)

A World Aeronautical /Aviation Chart (WAC) is a type of chart used for navigation by pilots flying primarily moderate speed aircraft and aircraft operating at high altitudes. The Australian charts in TOM2 are part of the International Civil Aviation Organisation (ICAO) 1:1,000,000 international series, designed for pre-flight planning as well as pilotage (approximately 1 inch = 13.7 nautical miles or 16 statute miles). WACs show topographic information, airports and radio navigational aids. Australian WAC charts are amended every 3 to 5 years.

Figure 6 Base Layer: World Aeronautical Charts (WACs) Map Layer

3. The BoM Satellite Image

The Bureau of Meteorology satellite image, available in the Layers Menu under the Bureau of Meteorology Operational grouping, can also be used as a background layer. Here it is shown over the top of the Street Map:

Figure 7 BoM Satellite Image

Background Map Layers with Queensland Extent

Four Base map layers in TOM2 cover all or part of Queensland. They are 1:25,000 Scale Topographic maps from Geoscience Australia, UBD 2010 Map Books, the Queensland Government Imagery and the BOM Satellite Image (found under BOM Operational Layers) which can also be used as a base layer.

1. Topographic 1:25,000 Line Maps

The DERM Topographic 25K Line Maps are traditional topographic maps where all features have been interpreted for the map user from aerial photography.

Figure 8 The1:25000 DERM Topographic maps covering Queensland (outlined in red)
Figure 9 Base Layer: 25K Topographic map from DERM.

2. The UBD 2010 (UBD is a division of Sensis)

The UBD 2010 layer includes the Queensland state map, normal UBDs and two zoom levels for the inner city. The images are the same as those in the UBD Cities and Towns Street & Travel Directory, 19th Editor. The UBD maps include Caravan Parks, Hospitals, Shopping Complexes, Police Stations, Lookouts, and Wineries.

  • State map at about 1:1,000,000K
  • Brisbane, Gold Coast, Sunshine Coast Metropolitan at 1:20000
  • Outer Areas Brisbane and Sunshine Coast 1:40000
  • Parts of Stradbroke Island 1:60000
  • Inner Brisbane 1:10000
  • Brisbane CBD 1:5000
  • The regional towns are done at a range of scales.

The UBD has two digital raster map products that can be used with mapping software such as OziExplorer and TrackRanger called: Australian City Streets and Australian Regional Cities and Towns.

3. Queensland Government Imagery

The DERM coordinates the purchase of tiled Queensland government imagery available in TOM2, which may include is a combination of high resolution aerial and satellite imagery and lower resolution satellite imagery. The imagery in TOM2 is updated as soon as it becomes available through the Queensland Government Imagery Coordination Program.

Figure 10 Queensland Government Imagery

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About yvonnert

Extensive experience working in government spatial data infrastructure. Over ten years as a bridge maker in emergency services, with strong partnering skills providing leadership for spatial information strategy.

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