Files In Gtz Or Gz Format - GPS TrackMaker Reference Manual

2.3 Files in GTZ or GZ Format

Files in GTZ or GZ format created by GPS TrackMaker® are compressed GTM files. Files in GTZ or GZ format
maintain the same accuracy as GTM files, but with half of the size of GTM files. Basically they are appropriate for
those Users who want to transfer data to the Internet or save disk space. The compact data storage of GTM files
reduces the risk of data corruption when downloading files from the Internet.
GTZ or GZ files can be opened directly in GPS TrackMaker®, No decompression program is needed.
The Author suggests using the GZ format for saving GPS TrackMaker® files on the Internet. This procedure,
reduces the size of the GTM file, and also will reduce the probability of data corruption when downloading the file.
2.4 Files in Text Format
One of the great features of GPS TrackMaker® program is the ability to save files in text format ( TXT ). This
format is useful for those who want a detailed analysis of data, as well as making it easier to interface with
another program, once data recognition becomes an easy task.
Text file output is in the following format:
Version
The version of text file is the first data to be saved. The version of text file is separate, and may not coincide with
the version of the Program.
Datum
The datum is the second data to be saved in text file, as shown below. The name comes first, and its function is
purely indicative. The program will only recognize the index number that follows the comma. The internal datum
table used by GPS TrackMaker® can be seen in the
Datum Name, index number, Semi-axis of Earth (m), Flattening, DX, DY, DZ
When reading the Datum, the program only recognizes the field index number . The other fields are kept only to
illustrate.
User Grid
GTM PRO uses this field® to register the characteristics of an user defined coordinate system. It will be present
only if the data is saved in Use Grid .
USER GRID, Grid Number, Central Meridian, False Easting, False Northing, Scale
Datum Table .
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