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Airborne Survey Report
Airborne Survey
These six test sites have been flown during summer 2000, using the HyMap airborne
hyperspectral imaging spectroradiometer operated by HyVista Corporation (126 bands in the
450 - 2500 nanometers range). The sensor, installed on board of a Dornier 228 from DLR,
was flown at an altitude of 2000-2500m above ground level and a speed of 270 Km/h,
enabling a 5m ground resolution and a 2500m swath with a 20% strip overlap.
The HyMap sensor on board of the Dornier 228
The airborne spectrometer system consists of the following equipment:
 | The HyMap scanner , built by Integrated Spectronics Inc of Sydney,
Australia, has four spectrometers in the interval 0.45 to 2.45 nanometers excluding the
two major atmospheric water absorption windows. The bandwidths are not constant, but vary
between 15 and 18 manometers. The scanner has also an on-board bright source calibration
system, which is used to monitor the stability of the signal. The signal/noise ratio
measured outside the aircraft with a sun angle of 30° and a 50% reflectance standard is
more than 500/1 except near the major atmospheric water absorption bands. The scanner is
operated via a touch screen from a Pentium computer controlling all data acquisition
functions. One band is continually displayed on the operator screen and a number of
diagnostic parameters are available and monitored. The scanner is mounted on a
hydraulically actuated Zeiss-Jena SM 2000 stabilised platform. The platform provides +/- 5
degrees of pitch and roll correction. The yaw can be offset by +/- 20 degrees with +/- 8
degrees of stabilisation. The platform provides a residual error in nadir pointing of less
than 1 degree and reduces aircraft motion effects by a factor ranging from 10:1 to 30:1. |
| Geolocation and image geocoding is achieved with DGPS and an integrated IMU (inertial
monitoring unit): |
| The differential GPS is applying an Omnistar service that updates its
readings every second and allow interpolation to ten readings per second. |
| The Inertial Monitoring Unit (IMU) samples at the frequency of the GPS,
i.e. ten samples per second. |
The Dornier 228 from DLR
Aerial photographs
Simulatneaous acquisition of aerial photographs was performed during the survey, using
a Zeiss-RMK A 15/23 aerial camera, in view of the production of accurate Digital Elevation
models.
The Zeiss-RMK A 15/23 aerial camera on board of the Dornier 228
Quick look
Data Set Preview of hyperspectral airbone surveys:
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