Modern Remote Sensing: Imagery, Capabilities, Possibilities Paul F. Hopkins phopkins@syr.edu phopkins@syr.edu 315.470.6696 Workshop on Advanced Technologies.

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<ul><li> Slide 1 </li> <li> Modern Remote Sensing: Imagery, Capabilities, Possibilities Paul F. Hopkins phopkins@syr.edu phopkins@syr.edu 315.470.6696 Workshop on Advanced Technologies in Real-Time Monitoring and Modeling for Drinking Water Safety and Security </li> <li> Slide 2 </li> <li> Paul F. Hopkins Remote SensingWater Safety and Security Workshop Presentation Content Basic principles of remote sensing Traditional and modern imagery resources Digital image processing Preprocessing Information extraction Accuracy assessment Additional topics in image processing Modern approaches to information extraction Change detection Data fusion A few examples </li> <li> Slide 3 </li> <li> Paul F. Hopkins Remote SensingWater Safety and Security Workshop What is Remote Sensing? Remote distant or without physical contact Perceiving or studying interesting properties and objects without physically contacting them Sense perceive, feel, or study properties or objects </li> <li> Slide 4 </li> <li> Paul F. Hopkins Remote SensingWater Safety and Security Workshop Remote Sensing Process Three general stages Acquiring image data Processing image data to produce information Communicating and using information Expectations must be reasonable Information providers and users need to be knowledgeable We understand the capabilities of the traditional image data sources and applications Much less understanding about recent remote sensing technologies </li> <li> Slide 5 </li> <li> Paul F. Hopkins Remote SensingWater Safety and Security Workshop Energy-Surface Interactions When energy strikes a surface, three interactions can occur: Reflection Absorption Transmission Generally, in remote sensing, reflection is of most interest Reflectance Degree of reflectance varies with wavelength For visible energy, spectral reflectance produces the colors we perceive </li> <li> Slide 6 </li> <li> Paul F. Hopkins Remote SensingWater Safety and Security Workshop Presentation Content Basic principles of remote sensing Traditional and modern imagery resources Digital image processing Preprocessing Information extraction Accuracy assessment Additional topics in image processing Modern approaches to information extraction Change detection Data fusion A few examples </li> <li> Slide 7 </li> <li> Paul F. Hopkins Remote SensingWater Safety and Security Workshop Traditional Remote Sensing Aerial photography and expert processing image interpretation (photointerpretation) Image measurement (photogrammetry) Satellite digital imagery of moderate resolution and computer processing Weather satellites, Landsat, SPOT, and IRS Image processing procedures Enhancements and transformations Spectral pattern recognition Data continuity </li> <li> Slide 8 </li> <li> Paul F. Hopkins Remote SensingWater Safety and Security Workshop Modern Remote Sensing (data) High spatial resolution digital imagery On the order of 1m or better resolution Exceptional spatial detail but many new challenges High spectral resolution imagery Dozens, if not hundreds, of spectral bands Fundamental changes in processing data High temporal resolution imagery Radar (microwave) digital imagery Operational advantages Information content very different than others Lidar </li> <li> Slide 9 </li> <li> Paul F. Hopkins Remote SensingWater Safety and Security Workshop Idea of Spatial Resolution 1 meter pixel 30 meter pixel </li> <li> Slide 10 </li> <li> Paul F. Hopkins Remote SensingWater Safety and Security Workshop Comparison of Spectral Resolutions MULTISPECTRAL Number of Bands: Tens Bandwidth : Wide (micrometers ( m)) (micrometers ( m)) Spectral Resolution: Medium HYPERSPECTRAL Number of Bands: Hundreds Bandwidth: Narrow (nanometers (nm)) (nanometers (nm)) (Narrower in reflective region than in emissive region) Spectral Resolution: High ULTRASPECTRAL Number of Bands: Thousands Bandwidth: Very Narrow (</li></ul>

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