Technical Specifications

Landbase is a maintained, accurate, topologically correct geo-spatial database of New Zealand.

System

Landbase resides within a Smallworld GIS environment (An Object Orientated GIS Database System). Smallworld is a Version Managed Database, i.e. enables “long transactions to occur”. A long transaction is the ability to take data at a point in time, change it, update it with other changes going on within the system, potentially discard it or return it to the database, the system knowing what data it should update. This transaction can be based over days, weeks or even years.

Positional Accuracy

Major towns and city data have been captured to ± 0.5m by photogrammetric methods, minor towns and peri-urban areas ±5m. Data for rural areas <25m accuracy.

Data Supply

Customer supplies are delivered by two distinct methods. The first is by Smallworld replication. That is, the client uses a Smallworld database and the Terralink International Landbase sends updated data to the client via a VPN link, hourly, daily, or weekly. Data can also be sent back to the Terralink International Landbase by the client for ongoing data maintenance

The alternative method is data extraction by translators created by Terralink International, into all of the major GIS formats.

Maintenance

A dedicated team of GIS analysts are continually maintaining, updating and expanding Landbase data. Frequent data updates come chiefly from central and local government authorities, and client databases. When Terralink International creates new orthophotography it is used to check the spatial accuracy of existing Landbase data and the location of new data not yet received from other sources.

Where a client’s data is integrated into the Landbase data, it is checked and validated against existing Landbase data, before being replicated back to the customer’s GIS system.