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Last update:
01 03 2017
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Fast, flexible and accurate technology
Equipment

Helimap System SA uses only its own equipment, designed in-house and protected under the Helimap System® name. The system is an evolution from joint research conducted at the laboratories of photogrammetry and geodetic engineering of the Swiss Federal Institute of Technology of Lausanne .
Helimap System® is based on the combination of airborne Laser scanner and high resolution digital camera with direct georeferencing technology (GPS-INS). Helimap System® integrates high tech sensors into a single original modular handheld unit. The technical specifications are the following:
    Riegl Laser scanners permiting the measurements until 275'000 point/sec with a field of view (FOV) of 60, and several pulses in the air
    Hasselblad Color or CIR digital camera 50 Mpix with FOV of 57 and PhaseOne 80-100 Mpix with FOV of 55
    IXBLUE Navigation grade Inertial measurement unit (IMU)
    Dual frequency GNSS receiver (GPS-GLONASS)
    Thermal Camera Flir SC655
    Up to 4 additional oblique cameras (45) 18-24 Mpix
    Up to 6 additional 4K synchronized GoPro video (360 video)

Helimap System SA owns 5 LiDAR-photogrammetric equipments that can be mounted on either helicopters or ultra light aircraft and one mobile mapping system.
The 5 equipments allow us to be on very short notice everywhere around the world.

    HS1 (2005): Riegl LMS-Q240i + iMAR FSAS + H1D 22 Mpix
    HS2 (2008-2014): Riegl VQ480i + IXSEA AirINS + H4D 50 Mpix
    HS3 (2012): Riegl VQ580 + IXSEA AirINS + PhaseOne iXU-R 1000
    HS4 (2015): Riegl VQ480U + IXSEA AirINS + PhaseOne iXA-R 180
    HS5 (2016): Riegl VUX-1LR
    Mobile System IGI-SAM (2013): Riegl VZ400 + 2xFARO Focus 3D + IMUIIe + AVT3000
 

The combination of Laser and imagery brings several advantages on classical airborne technique:

    The multiple echoes permit to measure points trough vegetation
    Automated DSM/DTM measurement
    High density point clouds
    Imagery completes the information for orthoimages and interpretations
The the flexibility of operation of the systems provides fundamental advantages on conventional airborne systems:
    Easy and affordable deployment, anywhere on the planet
    Independance from the helicopter type (usable with SA318, AS350, AS355, AS365, EC155, EC135, EC 145, A109, MI-8, MI-17, Kamov KA-32, Gazelle, Bell212, Bell205, Bell412, R44, R66)
    Installation possible on ultralight aircraft such as gyrocopters, airplanes
    Full STC on AS350/AS355 helicopter and on all helicopters equiped with hoist
    No calibration required
    Oblique or vertical mapping within the same flight, ensuring a constant accuracy whatever the slope
    Short setup time (30min) between the time the helicopter arrives and we take off


                  Vertical configuration                     Oblique configuration

Performance

The performance of the system can be described in terms of mapping accuracy (at the ground level)

    Mapping accuracy

    The mapping accuracy is given by comparing the measurements with ground control points (GCP). Photogrammetric mapping accuracy refers to residuals to check points on ground. As accuracy is highly correlated to flight height, the following table shows the possible mapping accuracy vs. flight height. Laser point cloud accuracy is divided into a relative and absolute component. The relative precision refers to the inner noise within the point cloud (trajectory independant), while absolute refers to GCP's comparison. The estimated accuracy refers to hard surface accuracy (1 sigma).

    Flight height [m]
    LiDAR XY acc. [cm]
    LiDAR Z acc. [cm]
    Ortho Acc. [pix]
    Relative LiDAR acc. [cm]
    100
    3-5
    3
    2
    1
    300
    5-7
    5
    2
    1-2
    500
    10
    5-7
    2
    1-2
    700
    15
    10
    2
    2-3

Helimap System SA 2008 - 2017