During the process of preparing the photographs, the original images taken from the aircraft are rectified so that distortions relating to the camera position and land surface are minimised. The photographs are then effectively stretched over the spatial land model we use in TUMONZ (using the NZ Map Grid projection).

TUMONZ can display national data sets from four different sources simultaneously;

1. Topographic (vector),
2. Cadastral or Properties (vector),
3. National & Regional Aerial Photograph sets (raster), &
4. Sea Contours (vector)

Each of these data sets are effectively independent and the fact that they superimpose well within TUMONZ is a credit to the NZ Government, Local Government and other agencies who own and maintain them.

If you have the Property Boundaries module (set property boundaries to show on photos via the Map Legend), you will likely see differences between property boundary lines and corresponding points within the photographs. The photographs are of sufficient resolution to make these noticeable. There are a number of sources of error to be aware of, for instance:

• fence lines may not be on true legal boundaries,
• resolution error within the photos,
• resolution error within the Property Boundaries line work (some of the lines are from old digitized maps rather than recent survey data - LINZ will replace these lines with more accurate definition over time), and
• the apparent displacement of tall objects on the land which is really just to do with camera angle.

Given the above cautions, the Property Boundaries module can be very useful in quickly developing a property map. Just a left click on the property and 'Make editable' will make your own copy of its boundary. You can then edit its display properties and shift it if you wish.

Note. If you require a definitive answer on the location of legal boundaries, then you should use survey marks and or the services of a registered surveyor.

Terms & Conditions
The Rodney District Council colour aerial photos described here are the Intellectual Property of Rodney District Council (hereafter RDC) and are made available subject to these standard Terms & Conditions.

In installing and using the RDC colour aerial photos (hereafter called Rodney District aerial photos module ) you are required to read and agree to the following Terms & Conditions.

1. Not to sell, offer for sale or otherwise part possession with the Rodney District aerial photos module nor allow any third party to use, possess or have the benefit of the Rodney District aerial photos module;
2. not to remove any proprietary notices incorporated in or on the Rodney District aerial photos module;
3. not to copy, reproduce, translate, adapt, vary or modify the Rodney District aerial photos module in whole or in part; and
4. to ensure that the Rodney District aerial photos module is protected at all times from unauthorised use or access by third parties.

In addition, RDC disclaims all warranties regarding the Rodney District aerial photos module (whether express or implied) to the full extent permitted by law, including any implied warranties of merchantability or fitness for purpose. The RDC does not warrant that the Aerial Photography is free of errors or omissions.