An Introduction

A CORS Network is a virtual RTK correction broadcasting network comprises of several permanent ground located high accuracy GNSS receivers. These networks are commonly called NRS or VRS networks. Availability of these types of network eliminates the necessity of having ground marked reference points for control surveying.

Location data observed by several high accuracy GNSS receivers, commonly known as CORS are being processed at a central server. Processed data will be broadcasted to RTK Receivers via GPRS allowing users to obtain high accuracy positioning coordinates.

Today, CORS Networks are operating in many countries over the world, such as the US, Canada, UK, Ireland, Germany, Spain, Hong Kong and parts of Australia, just to name a few. CORS Networks can vary in size, from small local networks consisting of one or only a few reference stations, to dozens of reference stations covering large areas.

Users who want to engage in RTK, GIS, and Post Processing surveying have simply login to the network with their GNSS receivers using pre purchased login credentials. Once logged in, differential corrections will be received via GPRS to the users’ device making the working mode into Fixed or RTD.

We guarantee RTK & Static accuracy as mentioned below. For subscriptions please follow New Connection.

What is CORS?

Continuous Observation Reference Station - CORS is the world’s cutting edge GNSS survey technology. A ground located high accuracy GNSS receiver coupled with a Choke Ring Antenna is used to obtain location data from GNSS and processed in Real Time making the station a reference station. By connecting several stations, a network is formed to act as a virtual reference network for clients to log in and obtain RTK corrections to increase the positional accuracy.

What is CORSnet?

CORSnet is a rapidly growing network of GNSS CORS, providing fundamental positioning infrastructure for Sri Lanka that is accurate, reliable and easy to use. The network aims to support the spatial community and provide stimulus for innovative spatial applications and research using satellite positioning technology. It provides Differential GNSS, single-base Real Time Kinematic (RTK) and Network Real Time Kinematic (NRTK) positioning services, and RINEX data for post-processing applications. CORSnet is built, operated and fully owned by Suleco (Pvt) Ltd.

Benefits of CORS network

  • Possibility of Fast & Efficient Surveying
  • Eliminates the need and especially the cost for another receiver which acts as a base
  • Eliminates the resource time associated with equipment setup at the base site
  • Reduces the need for permanent monumentation on ground level
  • Enhance reliability is ensured
  • Minimization of Labour Requirement


Static GNSS Surveying
Base line < 30km
  • Horizontal - 2.5mm+0.5ppmRMS
  • Vertical - 5.0mm+0.5ppmRMS
Base line > 30km
  • Horizontal - 4.0mm+0.5ppmRMS
  • Vertical - 9.0mm+0.5ppmRMS
Real-time Kinematic Surveying
Single base < 30km
  • Horizontal - 10mm+1ppmRMS
  • Vertical - 20mm+1ppmRMS
Network RTK
  • Horizontal - 8mm+0.5ppmRMS
  • Vertical - 15mm+0.5ppmRMS