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Our digital satellite image products are primarily visual aids offering a photographic perspective of the coast and inland areas.
NATMAP Raster Maps
NATMAP Raster maps are exact digital copies of the Australian Government's NATMAP topographic maps. They cover the whole of Australia at 1:250 000 scale and are current to December 2004. There are two products - NATMAP Raster and NATMAP Raster Premium.

If you have a DVD-ROM drive in your computer, we suggest you buy the premium version.

Reams of product and technical info is provided here - if you want to skip all this, scroll to the bottom of the page where you can buy the product.

NATMAP Raster maps have a wide variety of professional and recreational uses, including ...

*real-time navigation with global positioning systems (GPS)
*route and adventure planning
*as backdrops in geographic information systems (GIS), where other information is overlaid and analysed
*map-based presentations
*a convenient and compact method of storing maps

NATMAP Raster contains all the software needed to use the maps on the Microsoft Windows 98, ME, 2000 or XP operating system and Internet Explorer 5.5 or better.

Major Features
*Includes all published 1:250 000 scale NATMAPs up to December 2004.
*Load maps by selecting from more than 310,000 place names, co-ordinates, NATMAP name or by using the index map.
*Over 100 new maps added.
*Measure distances on-screen.
*Display coordinates as latitude/longitude or grid coordinates, on either the GDA or AGD datum.
*Image resolution to 200dpi.
*Overview windows provide convenient indication of the location of the map on display in relation to the surrounding region and Australia.
*Includes software to select, view and manage the digital maps.

*Compatible with GPS software such as OziExplorer or TrackRanger.
*Compatible with most GIS and graphics packages, either by direct viewing or by exporting to GeoTIFF, TIFF, JPEG, Bitmap, or PNG formats.
*Print maps for area of interest.
*Dynamic scale bar changes as you zoom.
*Ideal for laptop or desktop computers.

Contents of NATMAP Raster (CD-ROM)
*All 513 of the 1:250 000 scale NATMAPs plus one inset (SD51-11 Browse Island) are provided as separate mapsheets on the Cartesian coordinate> *Map Grid of Australia 1994 (MGA94) - suitable for measuring distances and areas.
*All 1:250 000 scale NATMAPs including the inset joined into a seamless map mosaic at 1:250 000 scale (Geographic/Equirectangular projection) - suitable for location based activities.
*Small scale reference maps at 1:5 000 000 and 1:20 000 000 scales.
*2002 Landsat Satellite image of Australia (50 metre pixel size).
*Natmap Raster Viewer software (version 1.5).

Contents of NATMAP Raster Premium (DVD-ROM)
*Eight MGA94 maps provided as single mosaic for each UTM zone (UTM zones 49-56) - suitable for measuring distances and areas.
*All 514 mapsheets joined into a seamless map mosaic at 1:250 000 scale (Geographic/Equirectangular projection) - suitable for location based activities.
*Small scale reference maps at 1:5 000 000 and 1:20 000 000 scales.
*2002 Landsat Satellite image of Australia (25 metre pixel size).
*Natmap Raster Viewer software (version 1.5).

What are the differences between NATMAP Raster and NATMAP Raster Premium?
NATMAP Raster Premium has higher quality images than NATMAP Raster. Premium edition images have lower compression rates applied and in some cases smaller pixel size.
NATMAP Raster Premium is supplied on 2 DVD-ROMs whilst NATMAP Raster is supplied on 4 CD-ROMs.
NATMAP Raster has 514 individual maps based on MGA94 (UTM projection). In NATMAP Raster Premium, these maps have been mosaiced into separate UTM zone maps i.e. zone 55 contains all s*55** numbered maps as a single map image.
Map content and software operation is identical between versions i.e. NATMAP Raster and NATMAP Raster Premium operate in exactly the same way.
NATMAP Raster Premium Landsat satellite image has 25 metre pixel size, whereas the NATMAP Raster satellite image is coarser with 50m pixels.

What features have been updated in the 2005 versions?
*Inclusion of 109 new maps released after September 2003.
*Grid based (e.g. MGA94) and Geographic based images (Latitude and Longitude) both available on the same package (no need to purchase 2 versions).
*Improved installation and software setup.
*Simplified configuration tool (Raster Map Manager replaces the RasterViewer Configurator) allowing you to easily specify where maps are stored.
*The ability to measure map distances by tracing on the screen with a new Measure Distance tool.
*Reference scalebar and scale ratio now displayed on the map window.
*Higher Image quality DVD based Premium version available.

Are upgrades available for users of previous versions?
If you want the updated maps and functionality found in NATMAP Raster, 2005 Release, you will need to buy the new version. No upgrades are available for this product.

System Requirements - Recommended Minimum
CPU Intel 2.0 GHz Pentium 4 or faster (or equivalent) Intel 333 MHz Pentium II (or equivalent)
RAM 256 MB or more 64 MB
Free Disk Space Raster: 2.7 GB
Raster Premium: 9 GB 40 MB (Viewer only, maps run from CD/DVD)
Display 1024 x 768 with true colour 800 x 600 with 64K colours
Optical Drive Raster: CD-ROM 20x or faster
Raster Premium: DVD-ROM 4x or faster Raster: CD-ROM
Raster Premium: DVD-ROM
Web Browser Internet Explorer 6.0 Internet Explorer 5.5
Operating System Microsoft Windows XP Microsoft Windows 98, ME, 2000 or XP

If your system does not meet, or is incompatible with, the Minimum or Recommended system requirements described above, you may be unable to operate the product or experience functional problems when using the product.

Product Components
NATMAP Raster 2005 Release consists of the following components.
*Product User Guide and associated documentation.
*Digital map images (*.ecw format). These are organised into layers, with each layer equivalent to a specific map series, scale or product. The number of map images you receive will depend upon which version of NATMAP Raster you have purchased. Further information on the images that make up each layer may be found in Map Layers and Image Specifications.
*Software for viewing, exporting and data management. The NATMAP RASTER VIEWER is the software that is used for selecting and viewing maps. The stand-alone RASTER EXPORTER can be used to export the ECW map images into other graphic formats such as GeoTIFF, TIFF, JPEG, Windows Bitmap (BMP) and PNG. The RASTER MAP MANAGER allows you to manage where your maps are stored, so you are not restricted to storing all maps in the one location. For example, if you had limited disk space you may wish to have some maps stored locally on your hard drive, whilst others are stored on CD-ROM or network drives.

Map Layers
*Landsat 7 Satellite Image of Australia - Layer Name in the Raster Viewer: Satellite-Mosaic
The Landsat 7 Picture Mosaic of Australia was produced by the Australian Greenhouse Office (AGO), as part of their National Carbon Accounting System (NCAS), from data acquired by Geoscience Australia in 2001 and 2002. For more information on the Landsat satellite, refer to the Satellite Remote Sensing pages.
*1:250 000 scale Topographic Map Series
Layer Name in the Raster Viewer: "250K-Maps" and "250K-Mosaic"

The Data
The NATMAP 1:250 000 scale maps included in NATMAP Raster have been produced by Geoscience Australia's National Mapping Division and its predecessor, the Australian Surveying and Land Information Group (AUSLIG), in conjunction with the private sector. This is the largest scale at which published topographic maps cover the entire continent. The maps have been revised using a variety of data sources, including SPOT and Landsat satellite imagery, other government agency information, and data supplied by private companies and individuals. Production of the new NATMAP series began in the early 1990s, and concluded in 2003. This map series continues to be updated.
The 250K Maps layer includes individual maps based on the MGA94 projection (GDA94) - on the Premium edition these maps are joined together into a UTM zone mosaic. The 250K Mosaic has all maps joined into a single mosaic based on the Geographic projection (GDA94).

Accuracy and Reliability
The 1:250 000 scale map images used in NATMAP Raster are constructed from digital topographic data with a basic horizontal accuracy of approximately +/-140 metres. Therefore, the accuracy of positions reported by the software should approach that of the original paper map.
Topographic information included in the map images has been checked from multiple sources including satellite imagery. Most maps have not been field checked, so some information may not be accurate or up to date, especially rapidly changing features such as telecommunication towers and homestead names.

Gazetteer data (Place Name Search)
The Gazetteer of Australia 2004 Release is a compilation of more than 310,000 geographic names of Australia as of December 2003, provided by members of the Committee for Geographic Names in Australasia.

Creation Process
The images used in this version of NATMAP Raster are derived from the most current edition of the respective maps available from Geoscience Australia as at December 2004.

Raw raster images were created from the digital EPS files used to produce the new NATMAP paper map series. Where digital EPS files were not available, the paper map was scanned to generate the raw raster image. Each raw raster image was transformed to be positionally accurate and encoded with coordinates and projection information before being compressed in the final ECW image.

Why are some features not shown on 1:250 000 scale NATMAPs?
Some features on maps, especially small scale maps, are subject to what is known as cartographic generalisation. It refers to a group of techniques used by map makers which allow the level of information to be retained, while the amount of data shown on the map is reduced. These techniques include:
*pre-selection of representative features
*reshaping or smoothing lines
*removing small features
*aggregating many small features into a few large features, such as showing a group of buildings as a single building
*selecting certain features that maintain an overall shape, such as reducing the number of streams in a stream network without *losing the overall pattern of drainage
*enlarging important features which may otherwise be too small to show
*moving features relative to each other (displacement)

More on Displacement
Closely adjacent features may be located on the earth’s surface in such a way that they cannot be separated at the scale of the map. To make sure that the map is readable, one feature is kept in its true position, and the rest are displaced.
On NATMAP maps, the following list of features may be displaced when one or more are adjacent. The higher a feature is on the list, the more likely that it has been held in the correct position over those lower on the list.
*hydrographic lines such as coastlines, watercourses and lakes
*principal roads
*secondary roads
*minor roads
*vegetation boundaries
If two features need to be offset relative to one another and neither is listed above, the position of the feature with greater landmark value will be maintained.

For example, if a railway and road are coincident at the scale being produced, the road would be displaced. Where two or three features are close and adjacent, one may be displaced by up to 225 metres at 1:250 000 scale. In the worst case when all these features are close together, one may be displaced by up to 675 metres at 1:250 000 scale. However, any features that have been displaced must maintain their relative position. See the image and map area corresponding below.

Generalisation is not a completely automatic process and some human judgement is required. Decisions are usually based upon the significance of the feature at the scale of the map being produced, upon the number of similar features nearby, and the purpose of the map itself.

One major impact of generalisation is when using maps with global positioning systems (GPS). When a GPS track is overlaid on a map, the track may not match the road as it is shown on the map, because of the displacement described above. This is not an error in the position of the road as such, but one of the consequences of trying to make the map clear and readable.

Feature Masking
If you have a close look at any recent paper NATMAP map you would see that most rivers can be seen "underneath" or "on top of" the roads. The digital process used to manufacture the map images in NATMAP Raster can only show one layer in each pixel (picture element) of the image, hence some features will be masked. The order in which the layering occurs is fixed, and in some maps this may produce some illogical results or effects that will not appear on the paper map. Significant illogical effects (such as canals covering roads) have been edited but may be incomplete.

Map Rotation (applies to the 250K-Maps layer in NATMAP Raster)
The map images in this layer appear tilted because they are geo-referenced to the Map Grid of Australia (MGA). Each map's boundaries are based on latitude and longitude, but these boundaries do not always correspond to MGA gridlines. In order to match the map image to MGA, the image has to be rotated and stretched. Note that the blue MGA gridlines on the map are orientated vertically and horizontally in the Viewer, whilst lines of latitude and longitude will be shown at an angle.

Join Lines
The Landsat Satellite image is made up of 369 individual images, or scenes. Most of these scenes are cloud free and, in order to achieve this images were taken at different times of the year. Whilst every effort is made to colour match the images, in some cases image matching is not perfect because of differences in ground conditions or time of year that the images were taken.

Bleed Edges/Overlaps
New NATMAPs are produced with what is known as a bleed edge. This is the overlap area along the top and right-hand side of the map which allows a map user to overlay neighbouring maps easily. These edges remain in the maps in the "250K Maps" layer, but have been removed in the "250K Mosaic" layer. This was decided upon to reduce processing time and the likelihood of features and text being cut off, and to improve joining. In some cases, this may mean that slightly older information has been retained in these areas; however, this has only occurred in a handful of places around the country. If you notice this problem in a particular area, please let us know about it so we can correct it in future editions.

Positional Accuracy
Each identifiable coordinate pixel should be within four pixels of the calculated position. The production of maps involves cartographic generalisation of features which adds additional inaccuracies into the images. A full listing of dataset accuracies is provided below.
*Dataset Image Resolution Positional Accuracy
*1M-Mosaic 0.00116 degrees 0.0047 degrees
*5M-Mosaic 0.00470 degrees 0.0220 degrees
*250K-Mosaic 0.00032 degrees 0.0012 degrees
*Satellite-Mosaic Raster 0.00050 degrees 0.0018 degrees
*Raster Premium 0.00025 degrees
*250K-Maps Raster 32 metres 127 metres
*Raster Premium 29 metres

Pixel Size
The size of a pixel in metres for any of the Mosaic layers varies with the degree of latitude.

NATMAP Raster is organised on the media as follows:

*NATMAP Raster (4 CDs)
*Disc 1 Raster Viewer Software and installation files
*User Guide files
*1:250 000 scale Maps for NT, TAS and WA (MGA94)
*1:20 000 000 map*
*1:5 000 000 scale map*
*Reference Map*
*Disc 2 1:250 000 scale Maps for ACT, NSW, QLD, SA and VIC. (MGA94) *Disc 3 Landsat satellite image of Australia (50 metre pixel size)
*1:5 000 000 scale Map of Australia
*Disc 4 1:250 000 scale mosaic of Australia

NATMAP Raster Premium (2 DVDs)
Disc 1 Raster Viewer Software and installation files
User Guide files
1:250 000 scale Mosaic of Australia
1:20 000 000 map*
1:5 000 000 scale map*
Landsat satellite images of Australia (25 metre pixel size)
Reference Map*
Disc 2 Maps of each MGA zone at 1:250 000 scale

Maps labelled * are part of the installation files, and become useable upon installation to your hard drive where they are visible in your chosen installation directory.

Maps (except for those labelled * in the table above) are stored in the RastersStandard or RastersPremium folder depending on which version is being used. Within this folder is another folder which is named with the appropriate layer name. See the table below.

RastersStandard > 1M-Mosaic > NATMAP-CD3
RastersStandard > 250K-Maps > NATMAP-CD1 and NATMAP-CD2
RastersStandard > 250K-Mosaic > NATMAP-CD4
RastersStandard > Satellite-Mosaic > NATMAP-CD4

NATMAP Raster Premium
RastersPremium > 1M-Mosaic > NATMAP-DVD1
RastersPremium > 250K-Maps > NATMAP-DVD2
RastersPremium > 250K-Mosaic > NATMAP-DVD1
RastersPremium > Satellite-Mosaic > NATMAP-DVD1

Satellite images - Read this first!
Our digital satellite image products are primarily visual aids offering a photographic perspective of the coast and inland areas.

The images are supplied in Lat-Long and non-Lat-Long formats. Put simply, Lat-Long images use GPS-friendly Lat-Long positioning in a decimal readout, but distance-measuring functions are compromised by distortion of the image to allow for the Lat-Long system, with distance accuracy worsening further from the equator.

The non-Lat-Long images provide accurate distance measuring and slightly better image quality, but position is supplied in a non-GPS-friendly metric format.

Buyers should therefore decide if Lat-Long positions or distance measuring functions and image quality are the main criteria for their purchase.

Note that all our satellite CD-ROMs are Lat-Long, while the DVD is available in Lat-Long and non-Lat-Long. The DVD also has an additional image of Australia in a water-highlighting colour scheme.

Lat-Long positions are supplied in degrees to two decimal places by the ER Viewer software.

All our satellite images are clean and do not have place names or any other text data on the images. There is scattered cloud cover over some of North Queensland.

We recently dropped the price of our Lat/Long DVD to $59.95.

Choose carefully, as Ozmapper only refunds digital products if defective.

Seafarer RNC (Raster Nautical Charts) and Seafarer Viewer are made by the Royal Australian Navy's hydrographic service (AHS).

Seafarer charts are high-quality digital copies of Navy charts supplied on CD-ROM.

The Seafarer Viewer below is a low-cost version of the full-blown Endeavour Navigator program for viewing digital charts charts. It provides the viewer with waypoints, zoom functions and other utilities.

The RAN charts can also be viewed and be used for navigation using an authorised software system (AlphaMap, CPlot95, Microplot, Navi-Sailor 2500 or Navmaster) which allows a link to a GPS unit to show real-time vessel position.

Seafarer users can perform traditional navigational functions such as bearing and distance calculation, and route planning.

From a small-boat fisherman's point of view, trips can be planned in advance by inputting routes and fishing spot GPS data from the Seafarer chart into a handheld GPS, all from the comfort of an armchair and desktop PC.

To run Seafarer RNC you need:
*Seafarer viewer or an approved navigation system
*a Pentium computer
*a set of Seafarer charts

If you choose to buy Seafarer your CDs and permits will be forwarded to your delivery address. You will also be sent a dongle which attaches to the serial port of your computer. You will only be able to use your charts on a computer carrying your specific dongle.

For mariners who wish to update their charts regularly there is an Update Service.

When buying charts be sure to buy the chart pack that covers your area of interest. You can buy a Day Pack (DAY) that will cover an area of local interest, a Regional Pack (REG) that will cover a broader area or an Australian Pack which includes all Australian charts.

IMPORTANT LEGAL NOTE: Your licence allows you to use the software under the terms of the licence - it does not give you ownership of the chart information.

OzMapper Shop Departments
PO Box 3195
Darwin NT
08 8981 0621

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