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GPD file format
The GPD (Geophysics Pasi Data) format is the proprietary format that is used by the PASI
Polares 32 system for storing and exporting electrode geometry data and measured
electrical data related to a measurement session and stored in files. The features of the
protocol are described below with the aim of allowing the reading of the results files of a
measurement session produced by Polares 32 and their processing with third-party
systems for analysing the results.
The GPD format is the only proprietary output format for files produced by the Polares
32 system for which Pasi agrees to provide a definition, so any instrument that wishes to
provide analysis functions for data produced by the instrument should work on files
produced in GPD format.
During normal operation of the Polares 32 system, the results obtained from the
measurements are stored in proprietary binary files with BPD (Binary Pasi Data)
extension for which no documentation is provided. To obtain a file in GPD format that
can be used for export to third-party analysis systems, the following procedure must be
followed:
•
from the main page press the "Measurements session" button and open the BPD
file to be exported;
•
press the "Save session" button;
•
navigate to the directory where the output file is to be saved, write the name of the
desired output file, select the GPD format in the drop-down menu and press OK.
The following describes the GPD format in its version 1.
NOTE: It is advised not to manipulate GPD files manually using a text editor as this may
render the file unreadable and therefore unusable.
General structure
The GPD format is an ASCII text file consisting of lines terminated by an end-of-line
character (Line feed, 0A hexadecimal), which in turn are composed of strings separated
by horizontal tab characters (Horizontal tab, 09 hexadecimal). The information is given
in the format "Parameter name" - "Parameter value", or if it is tabular information in the
format "Line with parameter name for each column" - "Line with parameter value for
each table element".
The file can then be viewed using a normal text editor and understood by a person.
The GPD file consists of five sections:
POLARES 32
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