Archive for December, 2007

What is Remote Sensing?

Friday, December 14th, 2007

Lillesand et al. (2004) define remote sensing as “the science and art of obtaining information about an object … through the analysis of data acquired by a device that is not in contact with the object.” This includes sensors that measure gravitational, magnetic, or electric forces; sonic devices; and optical and microwave imagers that ...

What are the Types of EMR Systems?

Thursday, December 13th, 2007

• Active EMR Systems: Radar (RAdio Detection And Ranging): Synthetic Aperture Radar(SAR) and InterFerometric SAR (IFSAR) LIDAR (LIght Detection And Ranging) • Passive EMR Systems: o Non-imaging radiometers (a.k.a., spectrometers) o Optical EMR imagers (some are imaging radiometers): Single-band imagers, e.g., panchromatic (PAN) Shortwave multispectral (MS) imagers: e.g., blue-light (BL), greenlight(GL), red-light (RL), ...

Is a Good Image Good Enough?

Monday, December 10th, 2007

Even the best looking natural color or color infrared images do not show the full extent of the information that can be extracted from a MS image data set. Making a “good-looking” image does not require highly-analytical operations. But, producing accurate and consistent information always requires highly analytical and precise, knowledge-based operations. Many analysts rely ...