VICROADS ELECTRONIC MAP IMAGES

Introduction

This CD-ROM contains images from the VicRoads Corporate Map Bases at six scales ranging from 1 : 10 million to 1 : 25K. It includes indexes appropriate for use with the VicRoads Country Street Directory (VCSD).

The CD-ROM is made available to authorised users for uses including web pages, printed maps, GIS backgrounds etc.

VicRoads acknowledges that the material on this CD-ROM cannot be guaranteed error free. VicRoads is not under any liability for any loss or damage (including consequential loss or damage), however caused, which may be suffered or incurred or which may arise directly or indirectly from the use of the material contained on this CD-ROM.

Contents

The directory structure of this CD-ROM is shown below, along with an explanation of the data in each folder.

Documents

This folder contains explanatory documentation (including this document) outlining the contents of the CD-ROM and how it can be used.

Indexes

This folder contains a series of indexes for features in the electronic map images.  These indexes contain basically the same information as is included in the VCSD Edition 5, but may contain some updated information not included in Edition 5.  The indexes are held in databases in dBase format.

Indexes are provided for the following features:

·         Road Names (vcsd_index_roads.dbf)

·         Towns & Place Names (vcsd_index_places.dbf)

·         Caravan Parks (vcsd_index_caravan_parks.dbf)

·         Health Care – Emergency Hospitals (vcsd_index_health_emergency.dbf)

·         Health Care – Other Medical Care (vcsd_index_health_other.dbf)

·         Local Government (vcsd_index_local_government.dbf)

·         National Parks (vcsd_index_parks_national.dbf)

·         State Parks (vcsd_index_parks_state.dbf)

·         Other Parks (vcsd_index_parks_other.dbf)

·         RACV Services (vcsd_index_racv_services.dbf)

·         Snow Fields (vcsd_index_snow_fields.dbf)

·         TAB Outlets (vcsd_index_tab_outlets.dbf)

·         Tourist Information Centres (vcsd_index_tourist_info_centres.dbf)

·         Weighbridges (vcsd_index_weighbridges.dbf)

·         Wineries (vcsd_index_wineries.dbf)

Each index contains a range of information specific to each particular feature type.  All indexes contain the following fields which refer to map references in the VCSD:

·         map – Map number

·         Hg – Horizontal grid reference (letter)

·         Vg – Vertical grid reference (number)

·         mapref – Combined grid reference

·         tw_name – Township name (this field will only have an entry if the feature is on a township map)

·         map_town – Combined grid reference and township name

NOTE:  The map_town field is the field which should be used as the unique reference for each feature.  These map_town references specify a particular unique grid square on either the green 1:250K, cyan (pale blue) 1:100K or red 1:25K map pages.

Lat_Long_GDA94 / Pseudo_AMG / Vicgrid_AGD66 / Vicgrid_GDA94

Data on this CD-ROM is provided in four projections.  A projection is a way of representing the curved surface of the earth on a flat map.  The projections used on this CD are:

·         geographic latitude and longitude (using the Geodetic Datum of Australia 1994 – GDA94)

·         pseudo-AMG (using the Australian Geodetic Datum 1966 – AGD66)

·         Vicgrid66 (AGD66)

·         Vicgrid94 (GDA94)

The data on the CD-ROM is divided up into four sub-directories, one for each projection.  The sub-directories are named Lat_Long_GDA94, Pseudo_AMG, Vicgrid_AGD66, and Vicgrid_GDA94 respectively.

Details of each projection are provided below.

NOTE:  The re-projection of many of the images has resulted in these images having triangles around the outside.  To display these images as tiles, set the colour black - 0,0,0 (RGB) - to transparent.

Grids

This folder contains a set of shapefiles which represent the grid squares from the VCSD.

Shapefiles are a format used for data that comes with ArcView.  They are a simple, non-topological format for storing the geometric location and attribute information of geographic features.

The following grid shapefiles are provided:

·         town_grids_<projection name> - grid squares for the 1:25K town maps

·         100k_grids_<projection name> - grid squares for the 1:100K cyan edged maps

·         250k_grids_<projection name> - grid squares for the 1:250K green edged maps

·         all_grids_<projection name> - combined grid squares for the 1:25K, 1:100K and 1:250K maps

The attribute table for each shapefile contains the same map reference fields as the indexes, including the map_town field.  This allows you to search for a particular feature in the index, then locate and zoom to its grid reference in the shapefile.  If you are using the grids to locate a particular feature in one of the indexes, you should use the all_grids_<projection name> shapefile, as it contains all the grid squares with a unique map_town reference for each.

Images

This folder contains all of the VicRoads Electronic Map Images.

The raster images are all in 256 colour TIF format and tiled where necessary to maintain the number of pixels to less than 4200 x 3000.

Images are accompanied by ESRI Worldfiles. For pseudo-AMG images, image catalogs have been created.  The image catalogs can be loaded in ArcView, and allow you to view all tiled images as one theme, rather than loading each individual image as a theme in a view.  There is a catalog for each of the 6 scales.

The images are divided up into the following sub-directories, depending on their scale.

·         10_Million (1:10,000,000 images)

·         2_Million (1:2,000,000 images)

·         1_Million (1:1,000,000 images)

·         250k (1:250,000 images – green edged maps in VCSD)

·         100k (1:100,000 images – cyan edged maps in VCSD)

·         25k (1:25,000 images – township maps in VCSD)

A table of suggested scales for display of the images is provided below.

Greyscale images are provided only for the pseudo-AMG images.  These images use 256 shades of grey rather than full colour, and are useful to use as a backdrop when displaying coloured vectors.  The greyscale images are stored in the Greyscale folder under the Pseudo_AMG\Images\ sub-directories.

An ArcView 3.3 project (.apr) is included for pseudo-AMG colour and greyscale images.

Mapinfo V6.5 and Above

This folder contains Mapinfo TABs for the images in the Lat/Long projection.  Please refer to the Using VicRoads Images in Mapinfo.htm document for further information.

Tiles

This folder contains a set of shapefiles which represent the outlines of each tiled image.

Tiles are provided for the 1:1 Million, 1:250K, 1:100K and 1:25k image scales.

The attribute information for each shapefile includes the name of the tiled image which each outline relates to.

The image below shows the relationship between the 1:250,000 tiles and the green edged maps in the VCSD.

Sundry

This folder contains various additional electronic map images.  Unlike the other electronic map images, these sundry images are not geo-referenced (ie. they do not sit in the correct geographic location in space).

The sundry images include:

Interstate_Images

This folder contains images of interstate country town maps shown in the red section of the VCSD.  These images are not geo-referenced.

Oblique_Images

This folder contains images of the freeway interchange diagrams shown in the VCSD.  These images are not geo-referenced.

Other_Maps

This folder contains miscellaneous images from the VCSD which were not geo-referenced.  These other maps include:

·         Travel Time Map

·         Distance Guide

·         Melbourne City and Docklands Maps

·         Access & Bypass and Through Routes Maps

·         sundry tiles covering parts of the ocean off Victoria's coast.

This folder also contains a HTML file containing a chart of distances between major towns in Victoria.

Currency

There is a close relationship between the information in these images and the information contained in the VCSD Edition 5, although the images may contain updated information not included in Edition 5.