Vicmap Position - AGD66 and GDA94 Transformation Sample Point

nonGeographicDataset: TRANSFORM66_94
The test data set can be used to test high accuracy coordinate transformation (for compiled GIS data) and coordinate conversion in and around Victoria in relation to the Geocentric Datum of Australia. The test data can be used to compare outputs from software that: · Claims to use the official Intergovernmental Committee on Survey and Mapping (ICSM) high accuracy combined 7 parameter/distortion model transformation process and incorporating or derived from file data contained in called National 66 (13.09.01).gsb (refer to (http://www.anzlic.org.au/icsm/gdatm/) which is provided in the National Transformation Version 2 (NTv2) grid file format. · Claims to perform conversions between coordinate types relating to the Australian Geodetic Datum and Geocentric Datum of Australia including: - Geographicals: Latitude and Longitude coordinates (ie AGD66 and GDA94), - Universal Transverse Mercator (UTM) grid coordinates (ie Australian Map Grid 1966 (AMG66) and Map Grid of Australia 1994 (MGA94)) and - Custom Lambert conformal conic projection coordinates relating to the Land Victoria Vicgrid66 and Vicgrid94 projection specifications as they apply to Victoria (refer to www.giconnections.vic.gov.au)
 
Citation proposal Citation proposal
(2022)

Vicmap Position - AGD66 and GDA94 Transformation Sample Point

Department of Transport and Planning
 

Description

Title
Vicmap Position - AGD66 and GDA94 Transformation Sample Point 
Alternate title
TRANSFORM66_94 
Resource Type
Non geographic dataset  
Purpose
Validate software and data used to transform Land Victoria's data from AGD66 to GDA94 datum. 
Credit
The data set selection, test design, software management and output validation is credited to: Geoff Parkes Land Information Group Ross Honeyman Land Information Group Dr Philip Collier Department of Geomatics Melbourne University Martin Hale LIG 
Supplemental Information
Related Documents: None 
Status
Completed  
 
 

Temporal

Time period
2002-07-012003-07-01 
 
 

Spatial

Spatial representation type
Text, table  
Code
4283 


 

 

Maintenance

Maintenance and update frequency
As needed  
 
 

Format

 
 

Contacts

  Point of contact

Cited responsible party  

No information provided.
 
 

Keywords

Topic category
  • Geoscientific information
 
 

Resource Constraints

Use limitation
The test data is not to be referred to by users as verifying compliance with NRE or ICSM standards. 
Classification
Unclassified  
 
 

Lineage

Statement
Dataset Source: The data was processed initially in June 2002 by the Land Information Group and later verified by, the Department of Geomatics, University of Melbourne in the same month. Dataset Originality: Primary 
 
 

Metadata Constraints

Classification
Unclassified  
 
 

Quality

Attribute Quality
Comments
1:1 
Positional Accuracy
Comments
Datum transformation and coordinate conversion was verified at the submillimetre level. 
Conceptual Consistency
Comments
submillimter 
Missing Data
Comments
The data set covers the state of Victoria and immediate surrounds and consists of 160 points spread across the state of Victoria and includes 60 points sourced from the (ICSM) 'Sample AGD66 - GDA94 Transformation' points set contained in the file Transtest.xls found in the GDA Technical Manual (http://www.anzlic.org.au/icsm/gdatm/). The sub set of ICSM points are located in and immediately around the state of Victoria. Completeness Verification: This data set was generated by Land Victoria staff using FME (Build 444) configured to use the AGD66/GDA94 NTv2 grid file 'A66 National (13.09.01).gsb'. The starting data were AGD66 geographicals in decimal degrees to 15 decimal places. The actual values supplied as input to FME were the latitude and longitude coordinates expressed in decimal degrees. These were computed from corresponding degrees, minutes seconds values prior to being fed into FME. Coordinate pairs were then computed directly from these AGD66 geographical values using FME's @eproject function. The FME outputs were then verified by a member of the Department of Geomatics, University of Melbourne by comparison with GDAit and GDAy transformation software (refer to ICSM GDA web site at www.anzlic.org.au/icsm/gdatm/index.html) and formulae derived from first principles as follows: 1. Geographical coordinates The GDA94 latitudes and longitudes produced by FME were compared to results from both GDAit and GDAy. A perfect agreement to 9 decimal places of degree resulted. The number of significant decimal places for mathematical comparison was selected to ensure reliable backwards and forwards transformation processing could be performed such that the position solution would not degrade after many transformations between datums at the submillimetre level. 2. Universal Transverse Mercator Projection coordinates The MGA94 coordinates produced by FME were then compared to the results from GDAit and GDAy with small discrepancies ranging up to about 0.3 mm between all three solutions. It is believed that these differences are likely to be the result of a small rounding affect caused through the conversion from geographicals to map grid. These differences are not considered to cause concern for users. 3. VicGrid Vicgrid66 transformations where verified by comparing FME results with results obtained via ESRI's ArcInfo project file command. Vicgrid94 transformations were verified by comparing FME results with Phil Collier's testing process. Agreement was verified at about 0.1 mm. (refer to www.giconnections.vic.gov.au for vicgrid parameters). 
Excess Data
 
 

    Overviews

Graphic Overview of Data Footprint

  Provided by

  Share on social sites

         

  Views Views

Read here the full details and access to the data. Read here the full details and access to the data.

  Associated resources

Not available