Introduction to SNAP - Part 2

Introduction to SNAP – Part 2


The NZIS Positioning Stream has developed a two-part webinar aimed at those interested in learning more about how to use LINZ’s freely-available SNAP software. SNAP is widely used in New Zealand for geodetic and engineering surveys and is currently the only software that uses New Zealand’s deformation model to rigorously calculate NZGD2000 coordinates. It uses least squares to calculate coordinates and uncertainties, enabling rigorous testing against both relative and absolute accuracy standards. It can consume all common survey data types, including GNSS, levelling and traverse data.

The first webinar will start at the beginning for those who have either not have used SNAP before, or who may need a refresher.

The second webinar will focus on some more advanced analysis techniques involving multiple data types and datums (eg NZGD2000 and NZVD2016). It will also introduce the user-definable SNAP csv format. This webinar will suit those who have attended the first webinar, or who are already using SNAP in their business and are interested in extending their knowledge of the software.

Both webinars will use practical demonstrations of the software to illustrate the concepts.

Introduction to SNAP – Part 2 (90 minutes) – Nic Donnelly

  • SNAP csv file formats
  • Classifying observations and coordinates
  • Auxiliary parameters (bearing swings, scale errors and reference frame transformations)
  • Applying commands to subsets of data (eg spatial selection, date selection)
  • Testing against accuracy standards
  • Example using multiple data types (GNSS, levelling, horizontal angles, ellipsoidal distances etc)
  • Example suitable for meeting NZIS Professional Entrance requirements.

Presenter: Nic Donnelly – Manager Geodetic Infrastructure - Land Information New Zealand

Nic Donnelly is the Manager Geodetic Infrastructure within the Positioning and Resilience group at Land Information New Zealand. His responsibilities include the recovery of the geodetic system after significant earthquakes, developing procedures for least squares adjustments of geodetic data and helping manage New Zealand’s datum. Nic is a representative on the Australia/ New Zealand Permanent Committee for Geodesy, is the International Federation of Surveyors’ Special Liaison to ISO/TC211 and Chair of the International Federation of Surveyors’ Commission 5 3D Reference Frames working group. He has 15 years experience using the SNAP software, primarily as a tool for calculating the coordinates that are published in the Geodetic Database.

Date: Thursday October 26th

Time: 1:00pm to 2:30pm

Duration:2 Hours (2 CPD Point)

NOTE: If you have registered as an individual y our CPD points will automatically be added to your Dashboard after the event takes place. If you have booked via a group booking registration you will need to update your CPD points manually.

Registration Fee: Members:$100.00 + Gst - Non-members:$130.00 + Gst

NZIS Event Registration Form.pdf

For more information please contact Vanessa Delegat on 04 471 1774 or email:

  • 0.00
  • 26/10/2017 - 26/10/2017
  • 13:00 - 14:30
  • Online   Online   NZ
  • $115.00Members $149.50Regular
  • Register