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14. OzEnter DATA ENTRY
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14. 1 Introduction
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Most data are entered into OzGIS as external data files. Examples are Census
data and Census digitised boundaries. These files come from Census Bureaux,
Mapping agencies, data supply companies or your own data-base systems.
Some data can be prepared or modified with word processors or spreadsheets.
This chapter describes the formats of external data files required by
OzGIS and shows how to enter the example file provided with the system.
The files are entered into the system via the OzEnter program which checks the
data and writes them to internal files.
All data files must have names that finish with the extension DAT.
e.g. LONDON.DAT, SALES.DAT
Often data files will need further processing by the OzData program before used
for mapping e.g. attribute data may need manipulating by arithmetic expressions
geographic line segments may need thinning and forming into polygons.
Future versions of the OzGIS system may have incompatible internal file formats
so always keep important data files.
The system comes with many of the system files already entered e.g. device
files. The data files are also provided.
C