User Manual - pancroma

Digital spectra are recorded for minerals, flora, and various man-madesubstances as well as snow and ice. The individual spectra contained in thedatabases constitute an electromagnetic “fingerprint”. Matching remotely senseddata to a DS can give indications of the presence of the target minerals orsubstances. The DS for the mineral Muscovite is shown below.The PANCROMA TM LSA is a semi-automated utility for searching Landsatmultispectral data for spectral fingerprints. The user sets the search criteria foreach multispectral channel. The LSA then interrogates the six Landsatmultispectral channels to determine which if any pixels match the fingerprint data.It then displays each “hit” as a red pixel on a gray band image. An example willmake the use of this utility clearer. This example will look for something not veryexotic – Lawn Grass. We will use a subset of a Row 23 Path 39 Landsat sceneof Louisiana near the town of Abbeyville. Lake Peigneur is at the lower right.I subsetted the scene for faster processing, although you should have noproblem processing full Landsat scenes with computers with more than 2GB ofRAM. The band 123 (BGR) image is shown below.236