Since Landsat's launch more than 30 years ago, everyone from agriculturists to utility executives have looked to airborne and satellite spectral imagers to lift the veil of mystery surrounding natural resource exploration and development.System developers have promised that spectral imaging holds the key to previsual detection of diseases in crops and trees, the location of valuable minerals and schools of commodity fish, and a host of other applications above and below the Earth's surface.Some of those promises have come to true. Others have swollen into blackeyes on the face of a complex technology that intimidates even the initiated. Photonics Spectra looks at the issues surrounding spectral imaging technology, including value added consultants, research, technical developments and end-user access…