Airborne LiDAR/ALS

Aerial Surveys now operates a Teledyne Optech Galaxy Prime LiDAR system for surveys throughout New Zealand.   This system, with its 1000 kHz airborne laser terrain mapper and high altitude capability  is ideal for New Zealand conditions offering a range of options from high accuracy surveys to corridor mapping to larger area surveys for modelling. For details of the system specifications see:http://info.teledyneoptech.com/acton/attachment/19958/f-0278/1/-/-/-/-/Galaxy%20PRIME%20Brochure.pdf

The new ALTM Galaxy PRIME is the ultimate wide-area lidar sensor, with best-of-class collection efficiency, smallest form factor and highest quality data sets to meet rigorous USGS lidar standards. With a 6000m AGL collection envelope and 1-MHz “on-ground” collection rate, Galaxy is simply the most productive sensor available with the lowest SWaP for maximum application and platform flexibility.  In conjunction with the Galaxy Prime sensor we operate a PhaseOne IXM-RS150mp digital camera which is the latest in medium format camera technology delivering exceptional quality imagery.

The Galaxy’s PulseTRAK™ and SwathTRAK™ technologies make surveying simpler by providing unique innovative feature sets to maximize productivity, increase information content and reduce costs.  The PulseTRAK technology replaces conventional multi-pulse technologies for high PRFs at high altitude while the SwathTRAK technology dynamically adjusts the scan field of view during collection to maintain fixed swath widths and even point distribution, even in variable terrain.  With up to 8 returns per outbound pulse this sensor collects high density point cloud data suitable for any industry from utilities to forestry.

Aerial Surveys is still operating the H300 LiDAR system with its superior signal to noise ratio in conjunction with the Galaxy Prime sensor.

More About ALS

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AucklandAirport-DSM-2014 Airborne LiDAR has matured as an accurate and highly effective technology for the automated capture of terrain data through x, y and z points commonly referred to as point clouds.  The point clouds represent the simplest form of ALS data which can then be classified into a variety of products including digital terrain models, contours and above ground features.  ALS systems collect many more points than are necessary to define the terrain and hence generate large sized databases which are then filtered to create usable dataset sets.  Depending upon the area of interest, size, shape and type of terrain, the parameters within the LiDAR system (pulse rate, swath width and scan angle) are set to achieve the best solution for each project.

 

LiDAR DTM

Intensity Image

Unclassified Data

Ortho Image

Not only does the ALS system measure the time taken for each laser pulse to return to the sensor but it also measures the strength of the return signal.  This data is referred to as intensity data and when greyscale readings are applied to the measurements, an intensity image is created, effectively delivering a medium resolution black and white ortho image.  This greatly assists in validating classified datasets and identifying features in the surveyed area.

Elevation data provided by LiDAR is a perfect complement to high-resolution imagery, as it adds vertical dimension to enable 3-D modelling and much more.

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Download our LiDAR brochure from the home page for more information.

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