Aerial photography has been the backbone of forest mapping in New Zealand for nearly 90 years. While the technology behind it has evolved dramatically, the core principles remain remarkably consistent. Wenita GIS and Data Specialist Connie Galaz explains below.
The concept is straightforward: an aircraft flies at a set height along a straight path, capturing a series of overlapping images of the land below. These images are then stitched together during post production to create a continuous mosaic. Crucially, this mosaic is tied to a precise location on Earth through a process known as georeferencing, ensuring spatial accuracy for mapping and analysis.
In recent years, drones and satellite imagery have become increasingly popular and accessible. They provide excellent complementary data – but they have not replaced the aircraft. There are good reasons for that.
Aerial photography still offers unmatched advantages, including:
High quality detail that captures subtle features across large forested areas
Efficient coverage that allows vast regions to be mapped far more quickly than if using drones
Reliability – even though flights depend on weather windows
If you see me flying overhead, give me a smile – I’ll spot you later when I’m processing the photos!