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Introduction to Remote Sensing
Published in Caiyun Zhang, Multi-sensor System Applications in the Everglades Ecosystem, 2020
In addition to NASA’s airborne hyperspectral imaging sensors, several imaging sensors exist in the market for research applications including Compact Airborne Imaging Spectrometer (CASI), HyMap, and AISA. These sensors are operated by commercial companies, and data are often not free to the public. CASI collects data over the VNIR portion with 288 bands at about 2.5 nm interval. Flown on a standard fixed-wing aircraft configured for aerial surveys, CASI can achieve a spatial resolution in the range of 0.25 m to 1.5 m. HyMap collects data over 450 nm to 2500 nm with 126 bands at a spatial resolution of 3 to 10 m. The sensor is currently operated by the HyVista Corporation. Figure 2.16 shows an image collected by HyMap in the Kissimmee River area. AISA is a hyperspectral sensor collecting high-quality hyperspectral imagery covering VNIR (380–1000 nm), SWIR (1000–2500 nm), and thermal Long-Wave Infrared (LWIR) (7.6–12.4 µm) spectral ranges (www.specim.fi/). The AISA hyperspectral products include AISA Eagle for collecting data covering 400 nm to 1000 nm, AISA Hawk for collecting data covering 970 nm to 2500 nm, AISA Dual for simultaneous acquisition of VNIR and SWIR, and ASIA Owl for collecting thermal hyperspectral imagery. The configuration of these airborne sensors is summarized in Table 2.7.
Airborne hyperspectral characterisation of hydrothermal alteration in a regolith-dominated terrain, southern Gawler Ranges, South Australia
Published in Australian Journal of Earth Sciences, 2021
A. S. Caruso, K. D. Clarke, C. J. Tiddy, M. M. Lewis
HyMap airborne hyperspectral imagery was collected by HyVista Corporation in 2011 as part of a South Australian Government program to obtain hyperspectral data from prospective regions across South Australia. The HyMap sensor contains 124 bands across the visible, near-infrared and shortwave infrared regions of the electromagnetic spectrum (420–2450 nm) (Table 1). This imagery comprised 10 swaths, each approximately 2.5 km wide, over 415 km2 (136°0′–136°9′E; 33°44′–32°42′S). Atmospheric corrections were performed by HyVista using HyCORR software followed by Empirical Flat Field Optimal Reflectance Transformation (EFFORT) polishing pass (HyVista Corporation, 2003). The imagery was delivered as a georeferenced image mosaic calibrated to apparent surface reflectance with a spatial resolution of 4.6 m (Cocks et al., 1998; Hussey, 2015).