HySpex is presenting an integrated solution for hyperspectral drill core imaging. The system’s mineral mapping capabilities are presented in close cooperation with renowned academic and industrial partners through the Center to Advance the Science of Exploration to Reclamation in Mining (CASERM) led by the Colorado School of Mines and Virginia Tech. Utilizing HySpex cameras covering the spectral range between 400 and 2500 nm, the system is capable of scanning full core boxes in seconds. Using Prediktera’s new Breeze-GEO Software, real-time mineral mapping of the highest quality is achieved. Apart from different interactive qualitative and quantitative data analysis tools offered by Breeze, the platform includes the publicly available USGS Material Identification and Classification Algorithm (MICA) for mineral identification, as well as the Minimum Wavelength Mapping (MWL) algorithm. The scanner’s capabilities are demonstrated using drill cores from the LaRonde-Penna deposit. The deposit is located within the Archean Abitibi greenstone belt of Ontario and Quebec, Canada, which is home to numerous Volcanogenic Massive Sulfide (VMS) deposits. LaRonde-Penna contains an endowment of 71 Mt of ore grading on average 3.9 g/t Au and economic grades of Zn, Cu and Pd. Because the deposits have been studied extensively over the past decades, cores from the deposit open up a unique opportunity for research and development.
The HySpex Mjolnir-1024 hyperspectral camera provides a unique combination of small form factor and low mass combined with high performance and scientific grade data quality. The camera has spatial resolution of 1024 pixels, spectral resolution of 200 bands within 400 nm to 1000 nm wavelength range and F1.8 optics that ensures high light throughput. Rugged design with good thermal and mechanical stability makes Mjolnir-1024 an excellent option for a wide range of scientific applications for airborne UAV operations and field applications. The optical architecture is based on the high-end ODIN-1024 system and features a total FOV of 20 degrees with approximately 0.1 pixel residual keystone effect and even smaller residual smile effect after resampling. With a total mass of less than 4 kg including hyperspectral camera, data acquisition unit, IMU and GPS, the system is suitable for even relatively small UAVs. The system is generic and can be deployed on a wide range of UAVs with various downlink capabilities. The ground station software enables full control of the sensor settings and has the capability to show in real time the location of the UAV, plot the flight path of the UAV and display a georeferenced waterfall preview image in order to give instant feedback on spatial coverage. The system can be triggered automatically by the UAV’s flight management system, but can also be controlled manually. Mjolnir-1024 housing contains both the camera hardware and a high performance onboard computer. The computer enables advanced processing capabilities such as real-time georeferencing based on the data streams from the camera and INS. The system is also capable of performing real-time image analysis such as anomaly detection, NDVI and SAM. The data products can be overlaid on top of various background maps and images in real time. The real-time processing results can also be downlinked and displayed directly on the monitor of the ground station.
The HySpex ODIN-1024 is an airborne VNIR-SWIR hyperspectral imaging system which advances the state of the art
with respect to both performance and system functionality. HySpex ODIN-1024 is designed as a single instrument for
both VNIR (0.4 to 1 μm wavelength) and SWIR (1 to 2.5 μm) rather than being a combination of two separate
instruments. With the common fore-optics of the single instrument, a more accurate and stable co-registration is achieved
across the full spectral range compared to having two individual instruments. For SWIR the across-the-track resolution is
1024 pixels, while for VNIR the user of the instrument can choose a resolution of either 1024 or 2048 pixels. In addition
to high spatial resolution, the optical design enables low smile- and keystone distortion and high sensitivity obtained
through low F-numbers of F1.64 for VNIR and F2.0 for SWIR. The camera utilizes state of the art scientific CMOS
(VNIR) and MCT (SWIR) sensors with low readout noise, high speed and spatial resolution. The system has an onboard-calibration
subsystem to monitor the stability of the instrument during variations in environmental conditions. It features
an integrated real-time processing functionality, enabling real-time detection, classification, and georeferencing. We
present an overview of the performance of the instrument and results from airborne data acquisitions.
KEYWORDS: Short wave infrared radiation, Data acquisition, Calibration, Sensors, Cameras, Data modeling, Spatial resolution, Data processing, Georeferencing, RGB color model
HySpex ODIN-1024 is a next generation state-of the-art airborne hyperspectral imaging system developed by Norsk Elektro Optikk AS. Near perfect coregistration between VNIR and SWIR is achieved by employing a novel common fore-optics design and a thermally stabilized housing. Its unique design and the use of state-of-the-art MCT and sCMOS sensors provide the combination of high sensitivity and low noise, low spatial and spectral misregistration (smile and keystone) and a very high resolution (1024 pixels in the merged data products). In addition to its supreme data quality, HySpex ODIN-1024 includes real-time data processing functionalities such as real-time georeferencing of acquired images. It also features a built-in onboard calibration system to monitor the stability of the instrument. The paper presents data and results from laboratory tests and characterizations, as well as results from airborne measurements.
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