GDA Converter is the program that is
comprised of three utilities:
1. Converting MapInfo files to GDA,
2. Converting MapInfo tables from GDA to AGD66
or AGD66 and,
3. Converting coordinates stored in columns
Converting MapInfo files
The process to convert files to GDA is
to build a list of files that require conversion by selecting
files or folders through an input form. By selecting the "Convert"
button all files in the list passing the checks are converted.
After the conversion, a list reporting the outcome for each
file (converted or not converted) is presented through the
The Input Form
The concept of the input form is to build
up a list of MapInfo files that are to be converted to a GDA
coordinate system. Files can be added by clicking the "Add
File/s" button which will provide a dialogue where files
can be selected to add to the list (see screen example below).
If an entire folder of files is required
to be included in the list, click on the "Add Folder"
(see screen example below). A folder or drive can be selected
and all of its subdirectories will then be searched for MapInfo
tables, workspaces or geosets.
Records in the GDA conversion list
can be sorted by clicking on the column headers.
After files have been added to the GDA conversion
list, the GDA Converter checks whether each file needs converting.
For example, the file will not be converted if it already
in GDA format or the file is in a read only state. Click here
for preconversion checks performed by the software prior to
converting each file to the GDA coordinate system. The Convert
column will be ticked only if the file is able to be converted.
After the files have been processed, a report
is produced displaying the outcome of the attempted conversion
to the GDA coordinate system for each file. Files which were
not able to be converted to the GDA coordinate system will
result in an error code and message.
Use the "Copy to Clipboard" button
to transfer the list to your clipboard so that it can be pasted
into other applications such as a spreadsheet.
To produce a hard copy report, use the "Print
Preview" button so that list can be sent to a printer.
There are a host of settings within the print preview that
can be used to format the report.
The GDA Converter software provides backup and
processing options, allowing customisation to suit user needs
(see screen example below).
GDA Converter works directly on the MapInfo
table and copies the original to a backup folder. Only the
originals of successfully converted files only are placed
in the backup folder. Any other files will remain untouched
and left in their original locations.
The original files may be placed in the
backup directory according to 3 possible naming options:
1. Files are placed directly under the
backup folder. There is a risk using this option if two files
with the same name but in different folders are converted
that one will wipe over the other.
2. Files are placed in the backup directory under a directory
called the same name as your user logon. There is a risk using
this option if two files with the same name and logon account
but in different folders are converted that one will wipe
over the other.
3. Files are placed under the backup directory in a folder
with the same name as the original. For example, if the original
folder and file was c:\data\example.tab and the backup directory
c:\temp, the backup file will be called c:\temp\data\example.tab.
There is a risk that if a file is converted with the same
folder and name but on a different drive that they could override
each other. The chances of this loss occurring would usually
be low, consequently it is recommended that this be the preferred
The "Overwrite" checkbox safeguards
any files that may already exist in the backup directory with
the same name as the file being converted. By ticking this
option, the file will not be converted and an appropriate
error will be recorded in the output.
GDA Converter provides the following processing options:
||Conversion of unprojected latitude
and longitude files. The default MapInfo projection is
unprojected latitude and longitude. You can use the conversion
of unprojected latitude and longitude files option to
assume these coordinates are on the AGD84 or AGD66 datum.
||Conversion of tables in workspaces
to GDA projection when the workspace or geoset is converted.
||Conversion of tables referenced by
seamless tables when selecting seamless tables for conversion
to the GDA coordinate system.
||Add a metadata tag to the converted
MapInfo table. The tag name is called "GDA Conversion"
and the date, time and username is recorded.
Converting tables from
GDA to AGD66 or AGD84
This process is very similar to converting
tables to GDA as described above however instead of converting
tables to GDA it will convert them back to AGD66 or AGD84.
stored in columns to GDA
Use the GDA Columns command to convert
coordinates stored in columns in a MapInfo table to GDA coordinates.
Select an open MapInfo table from the list and the projection
you require it to be converted from. Also choose the columns
where the coordinates are stored.
When using this command, the coordinates in
the table are updated directly without saving. Use the standard
save command in MapInfo to keep the changes.