Remote Sensing Basics | August, Fieldwork Review

Remote Sensing Basics | August, Globe Program Field Protocol Missing 3 compasses, 3 MUC field guides

Remote Sensing Basics | August, Compass Readings Declination Calculator: sphttp:// sp Corpus Christi, 8/5/07 = 4º 52’ E True N = magnetic N + declination (E+/W-) To make a NE (45º) line: –stand exactly over pixel center –move adjustable compass ring to 45º + 5º = 50º –Line compass needle up with the small red arrow in center –Walk in the direction that the large red arrow is pointing; be sure to keep compass needle inside the small red arrow

Remote Sensing Basics | August, Locating Pixel Corners Pixel = 30 m Side A = 30 m Side B = 30 m a 2 + b 2 = c = c 2 c= m Center to corner = 42.42/2 = m NWNE SESW

Remote Sensing Basics | August, t Green cover =52% Brown cover = 18% Sand = 30%

Remote Sensing Basics | August, Landsat Resolution Landsat 5 and 7 have a 16-day repeat cycle (they are 8 days out of phase with each other) Data is quantized to 8 bits (256 shades of grey) Platform: “free-flyers;” instruments (MSS, TM, ETM+) on Landsat satellite

Remote Sensing Basics | August, ASTER Resolutions »Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) has a 60 km swath and 14 channels (3 VIS - 15m, 6 SWIR - 30m, 5 TIR - 90m) »Radiometric resolution = 8-bit »Temporal resolution = pointable, VIS = 24º, SWIR & TIR = 8.54º, only collects on demand »Platform: Terra ASTER, May 10, 2000 Palm Springs, CA

Remote Sensing Basics | August, MODIS Resolutions Moderate Resolution Spectroradiometer (MODIS) acquires near- daily global data at 3 resolutions: –250 m (2 bands) –500 m (5 bands) –1000 m (29 bands) All spectral data are calibrated and quantized at 12 bits (4096 digital numbers) Platforms: Terra/Aqua MODIS 250 m & 500 m Ban d Wavelength (μm) Descri p Red Near IR Blue Green Mid IR Mid IR Mid IR *MODIS data products

Remote Sensing Basics | August, Data Cubes ENVI Tutorials (requires registration)