Data Acquisition:

The Aerial Photography over this area was acquired using the UCXp and

UXC camera systems on the following dates:

29-Dec-10

19-Feb-11

10-Mar-11

11-Mar-11

12-Mar-11

29-Mar-11

30-Mar-11

1-Apr-11

The data was collected flying 1900 - 2100 metres above lowest ground.

These settings were selected to create a dataset with 0.125mGSD.

NZAM used a number of LINZ geodetic marks, Geosystems iBASE and

NZAM geodetic marks for the collection of GPS basestation data during the

aerial data acquisition. Detail of these will be provided in the final project

report.

Independent of the aerial survey work Opus International Consultants

Limited surveyed a series of ground control points for use in the Aerial

Triangulation of the raw images, and for QA of the final orthophotos.

Data Processing:

The sensor positioning and orientation (POS) was determined using the

acquired GPS/IMU datasets and Applanix POSPac software. This work was

all undertaken in NZGD2000 geodetic reference system using the data

collected at the LINZ geodetic reference marks for the differential processing.

The POS data was combined with the ground control in Aerial Triangulation

(AT) to geo-reference the raw photography in NZTM map projection. This

process was undertaken using Microsoft’s UltraMap AT and Leica’s ORIMA

software.

AT data, raw images and processed LiDAR DTM data were supplied to the

orthophoto production team for Orthophoto Generation. All subsequent data

processing steps were undertaken using Inpho’s OrthoVista, PCI and Socet

Set processing software.

The final orthophotos were checked for completeness of project coverage,

general appearance and accuracy.

The positional accuracy of the data has been checked by overlaying the Opus

field surveyed features on the dataset. The data was found to fit well in

position. The project specified positional accuracy of +/-0.3m (90%

confidence) has been met.