SNAP & CONCORD Downloads

SNAP

SNAP (Survey Network Adjustment Package) is a suite of programs for adjusting the coordinates of stations in a survey network to best fit the observed data. It can use horizontal angles, zenith distances, slope and horizontal distances, azimuths, projection bearings, levelled height differences, GPS data (baselines or multistation), and latitude and longitude observations.

SNAP runs on most recent versions of Microsoft Windows.

From here you can download the SNAP installation file snap_install.msi in a zip file. To install SNAP extract and run the installation file.

Some of the utility programs supplied with SNAP require the perl interpreter to be installed on the computer. This is can be obtained from the Activestate website.

CONCORD

CONCORD is a component of SNAP that converts coordinates between various different coordinates systems such as New Zealand Map Grid coordinates, Meridional Circuit Coordinates and NZGD49 or NZGD2000 latitude and longitude coordinates. CONCORD is an DOS command line program (run from a windows DOS box).

CONCORD that can be downloaded separately from the SNAP suite. To install it extract the contents of the zip file into a folder, and set the PATH environment variable to include that folder.

Downloads

 

Download and use of these software applications is taken to be acceptance of the following conditions:

1. LINZ does not offer any support for this software.
2. The software is provided "as is" and without warranty of any kind. In no event shall LINZ be liable for loss of any kind whatsoever with respect to the download, installation and use of the software.
3. The software is designed to work with MS Windows. However, LINZ makes no warranty regarding the performance or non-performance of the software on any particular system or system configuration.

Download other geodetic software or check LINZ datasets, downloads and software.

Program updates

14 October 2009
Fixes a bug in SNAP causing it to require dates to be supplied for observations even if the adjustment does not include a deformation model.

6 October 2009
The NZGeoid09 geoid model has replaced the previously used unofficial NZGeoid05 model in concord and SNAP. Also a number of functional enhancements to SNAP.

18 March 2009
Fix to snapspec when assigning orders using a posteriori statistics. Update to concord to include Darwin Glacier Lambert Conic coordinate system.

31 July 2008
Update to the import GDB stations function to work with the restructured LINZ website.

29 April 2008
Added listgps program to SNAP distribution, which was previously omitted.

8 February 2008
Removed system limits on the number of stations and parameters in a SNAP adjustment, previously limited to 32,000. Note that SNAP binary files generated used by this version are incompatible with previous versions of SNAP.