site2gps - calculate a dummy gps data file

Overview

site2gps is a program to create a data file of "dummy" GPS observations between stations in a coordinate file. This can be used to assist in network design before carrying out a survey.

The typical usage would include the following steps:

Create a SNAP coordinate file with the stations to be surveyed and their approximate coordinates.

Run site2gps to generate a data file of vectors between the stations. This can either generate specific vectors, or all possible vectors between the stations. Usually this would include the vectors in the proposed survey.

Edit the generated data file to specify the expected accuracy of the GPS observations.

Create/edit a SNAP command file using the station file and data file. This will include specifications of which stations are to be fixed. This will typically be a "network analysis" mode adjustment.

Run SNAP to determine the expected accuracies of the surveyed points.

Analyse the output with snapplot, snapspec, or by reviewing the listing file to see whether the required coordinate accuracies are achieved.

Running site2gps

The program requires as input a SNAP coordinate file and optionally a file listing the proposed observations.

The proposed observation file is a simple text file on which each line contains a set two or more station codes (separated by space characters). site2gps can generate either a multistation data set including each station in the set, or a set of vectors between each pair of stations.

To run the program use the command

site2gps [options] coord_file line_list_file output_file

or

site2gps -a [options] coord_file output_file

The program can take the following options: