June 2, 2016

LiDAR

scanning

NZAM has had significant experience in LiDAR (Light Detection and Ranging) acquisition of data collected throughout since 2005. The growing awareness of the results that can be achieved has justified the recent purchase of their system, the Leica ALS80. The system has an integrated GPS/IMU and medium format digital camera.

LiDAR, also known as airborne laser scanning (ALS), is a cost-effective alternative to conventional ground surveying for medium to large scale terrain modeling projects and accuracies achievable are far superior to photogrammetric mapping. Dense sets of discrete elevation points are captured that represent a sampling of the surface. Light is transmitted out to the target which is reflected back to the instrument where it is analyzed. The change in the intensity of the light enables some properties of the target to be determined. The time for the light to travel out to the target and back to the LiDAR is used to determine the range to the target.

Terrain shaded relief

Terrain shaded relief

LiDAR DEM

LiDAR DEM

DEM with Ortho Overlaid

DEM with Ortho Overlaid

LiDAR data is used to produce:

  • Spot heights
  • DEM, DTM, DSM
  • Contours
  • Feature extraction.
  • Building footprints and heights.
  • Vegetation measurements.
  • Breakline definition.
  • Road center-line location and road surface modeling.

There are a number of LiDAR products available on our Sample Data page.

And produces value-added products such as:

  • Hydro-logically enforced terrain models.
  • Data fusion.
  • Viewshed.
  • Virtual reality / augmented reality.
  • 3D fly-through.

The applications possible from LiDAR include accurate flood modeling, corridor mapping, wireless network planning, road and engineering design, power line mapping, hazard clearance, natural resource assessment, demographic profiling and urban planning, to name a few.