Building Earth Observation Cameras

251

8

Hyperspectral Imaging

8.1 Introduction

The cameras we discussed so far have spectral selection either in one broad

spectral band, usually covering the visible–near infrared (NIR), which is

known as the panchromatic band, or in a number of narrow spectral bands

at specic thematic locations in the visible–infrared (IR) region, which is

referred to as multispectral imaging. Thus, the IRS PAN camera takes imagery

in 0.5–0.75 μm, whereas LISS-3 collects data in four spectral bands (0.52–0.59,

0.62–0.68, 0.77–0.86, and 1.55–1.70 μm) within the visible to shortwave infra-

red (SWIR) spectral region. In multispectral imaging, we are sampling the ...