Overview
What is a DGPS Survey?
Differential GPS (DGPS) is an enhancement to standard GPS that uses a network of fixed ground-based reference stations to broadcast the difference between GPS satellite positions and known fixed positions. This correction data, applied in real-time or post-processing, delivers centimetre-level horizontal and vertical accuracy far beyond standard GPS.
Why is it Required?
Standard GPS provides accuracy of only 5-10 metres, which is insufficient for engineering and land survey applications. DGPS corrects satellite errors, atmospheric delays, and clock variations to achieve 1-5 cm accuracy — essential for large-scale topographic mapping, control surveys, GIS data collection, and infrastructure alignment work.
Who Needs it?
Government survey departments, highway engineers, railway authorities, pipeline companies, large real estate developers, solar park developers, environmental agencies, and any organization requiring sub-decimetre accuracy over large areas.
Key Benefits
Our Survey Process
Site Visit
Initial site assessment to identify existing control points, plan receiver placement, and assess sky view obstructions.
Data Collection
Deployment of base and rover DGPS receivers, collection of raw GPS observations for post-processing.
Survey Execution
Systematic collection of all required points using RTK or static GPS methods depending on accuracy requirements.
Analysis
Post-processing of GPS data using professional software to achieve maximum accuracy and eliminate errors.
Report Preparation
Generation of coordinate lists, control point sheets, accuracy reports, and survey drawings.
Client Delivery
Delivery of coordinate files, control point descriptions, accuracy certificates, and CAD drawings.
Deliverables
Frequently Asked Questions
What is the difference between GPS and DGPS?
Standard GPS gives 5-10m accuracy. DGPS uses correction signals from reference stations to achieve 1-5 cm accuracy, making it suitable for engineering and survey applications.
What is RTK GPS?
Real-Time Kinematic (RTK) GPS is a DGPS variant that delivers centimetre accuracy in real-time, eliminating the need for post-processing. We use both RTK and static DGPS depending on project requirements.
Can DGPS work in forested or urban areas?
DGPS requires a clear sky view for best accuracy. In areas with obstructions, we supplement with Total Station measurements to ensure complete coverage.
What coordinate system do you use?
We deliver coordinates in WGS84, UTM (Universal Transverse Mercator), or local state plane systems as per project requirements and survey authority specifications.
How many control points can you establish per day?
Using RTK methods, we can establish 200-500 control points per day depending on terrain and point density requirements.
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