Transcript Slide 1
ESS 421 - 1st half topics covered in class, reading, and labs Images and maps - (x,y,z,l,t) Temporal data - Time-lapse movies Spatial data - Photos and interpretation Spectral data Electromagnetic spectrum Absorption and Beer’s law (t=e-kz) Transmission Reflection Scattering and Lambert’s law R=Io(cos i)/p Interaction of light and materials Electronic processes (VNIR) - electron transition (VIS), sharing (UV), crystral field (NIR) Vibrations and overtones (SWIR-TIR) Gas, liquid, glass, crystalline Spectra of common materials leaves, soil, water, clouds, snow, iron oxides, hydrated minerals ESS 421 - 1st half key areas for midterm (Tuesday, 9 February 9:30-10:20) Questions may be drawn from labs, lectures, text Basic remote sensing parameters irradiance, radiance, and their units the electromagnetic spectrum thermal emission Atmospheric effects and scattering processes Scattering and reflection from surfaces Spectroscopy fundamentals Spectra of common materials Thursday 4 February Class 10: Earth-orbiting satellites and Review No Reading Last lecture: Spectroscopy, mineral spectra Orbit Platform Sensor C-130 Sputnik Sputnik 2 with Laika 1957 Sputnik 1999 EOS Airborne platforms – test beds, flexible paths SEBASS Hyperspectral TIR sensor in a Twin Otter Orbits Key elements: - eccentricity - inclination - periapsis Inclination Low inclination High inclination Hubble Space Telescope – low inclination most Shuttles low inclination Exception: SRTM i=58º High-inclination orbits Special case – Sun-synchronous orbit (i ~ -81º) Satellite is overhead at same local solar time all year Why would you choose - late morning? - mid afternoon? - early morning? Global coverage Sensor characteristics - spatial resolution and field of view - spectral resolution - spectral coverage - number of bands Spatial resolution depends on experiment high – spatial detail, less emphasis on spectroscopy moderate – environmental monitoring low – weather, oceanography Spectral resolution panchromatic multispectral hyperspectral (imaging spectroscopy) Spectral coverage Optical reflected sunlight thermal infrared LiDAR Microwave passive Radar Gamma ray, X ray, geophysical (magnetic, gravity fields) Thematic Mapper LANDSAT – SUN-SYNCHRONOUS ORBIT Tuesday class: • Midterm