|
A comparative study of results from GPS data processing software
Softwares used for comparison of results
This paper attempts to make a comparative study of the results from the GPS data processing software: GPSurvey Version 2.35, TGO Version 1.5 and Bernese Version 4.2. For this purpose the Bhuj data collected in February 2002 is considered, and independent processing of this data is done using all the above software. The steps involved in post processing of different softwares are listed below.
- GPSurvey Software Version 2.35
GPSurvey is vendor-supplied software, specifically suited for hardware supplied by Trimble Navigation Ltd., USA. It has a program called DAT2RIN, which brings hardware dependent DAT files to RINEX format that can be processed with other GPS data processing softwares. The main modules in GPSurvey are:
| GPLOAD |
: |
Downloading the data from the hardware |
| WAVE |
: |
Processing of baseline |
| TRIMNET |
: |
Adjustment of the Network |
| The steps involved in relative mode data processing are: |
| PROJECT |
: |
TO create new or open existing project |
| LOAD |
: |
To load data from DAT/RINEX file |
| PROCESS |
: |
Processing baselines, add files to WAVE module |
| WAVE processor |
| EDIT |
: |
Station Position (check base station "fixed control"
coordinates) |
| PROCESS |
: |
Setup (only to alter processing controls) Combinations of baselines to be processed |
| UTILITIES |
: |
Project report is generated. Coordinate transformations can also be done over different combinations of reference frame (Trimble GPSurvey Manual, 1998). |
- Trimble Geomatics Office (TGO) Software Version 1.5
The Trimble Geomatics Office software integrates data from a variety of surveying techniques, including GPS (Real Time Kinametic and post processing), conventional/optical instruments (including servo and robotic), levels, and lasers. The Trimble Geomatics Office software is useful for, GPS baseline processing, survey network adjustment, processing of GPS and conventional topographic survey data, quality assurance and quality control of data (QA/QC), road design data import and export, survey data import and export, Digital terrain modeling and contouring, datum transformation and projections, and GIS data capture and data export
The Key features of Trimble Geomatics Office (version 1.5) software are:
- Survey and plan view, displays project data in the graphic window
Project bar organizes commonly used tasks as shortcuts in the main graphics window
View filters allow observation types to be displayed or hidden
Import of data collected from GPS receivers and/or conventional total stations
DAT checking dialog allows checking and editing of raw GPS data before import
Properties window helps to view and edit all related information for points, as well as all observation types
Multiple edit dialog is for quick editing of multiple entities
Professionally presented output report in HTML format is generated
Standard and custom report formats can be prepared (Trimble, User Guide, 2001).
|
|
