Remotely Sensed Data EMP 580 Fall 2015 Dr. Jim Graham Materials from Sara Hanna Remotely Sensed Data Remotely Sensed data is: Acquired remotely from the observer This makes it different from field surveys
Acquired by: Satellites Airplanes UAVs/UAS/Drones Automated Stations? Active vs. Passive
Sensors can be active or passive Active sensors send out a signal and measure the returned signal: LiDAR Radar Passive sensors measure energy emitted by another source, usually the sun Most of the data we use (except DEMs) are from passive sensors so well be talking about them from now on
For more information, see GSP 216 Earth Observing Satellites Landsat 8 King Fire True Color Landsat 8 - King Fire False Color (Red Shortwave Infrared, Green NIR, Blue
Visible) Landsat 8 - King Fire False Color (Red Shortwave Infrared, Green Shortwave Infrared, Blue NIR) Landsat 8 King Fire October 5, 2014 Landsat Timeline
Landsat Orbit http://www.youtube.com/watch?v=P-lbujsV a2M Landsat The Landsat satellites have carried six different sensor types Return Beam Vidicon (RBV) Multispectral Scanner (MSS) Thematic Mapper (TM) Enhanced Thematic Mapper (ETM)
Enhanced Thematic Mapper Plus (ETM+) Operational Land Imager (OLI) and Thermal Infrared Sensor (TIRS) Enhanced Thematic Mapper Plus (ETM+) Enhanced Thematic Mapper Plus (ETM+)
Landsat 7 Band 1 Band 2 Band 3 Band 4 Band 5 Band 6 Band 7 Wavelength
Where to obtain data? USGS EarthExplorer http://earthexplorer.usgs.gov/ USGS Global Visualization Viewer - GLOVIS http://glovis.usgs.gov/ USDA Geospatial Data Gateway http://datagateway.nrcs.usda.gov/ What data products are
available? Landsat Archive MODIS Aerial photos Historical NHAP/NAAP/NAIP
Digital Elevation Models Climate Data Watershed Land Use/ Land Cover Soils File Sizes MODIS Image -11,127,225 pixels (7 bands, 500m resolution) Landsat Panchromatic - 234,404,221 pixels (1 band,15 m resolution)
Landsat Multispectral - 58,532,901 pixels (7 bands, 30m resolution) NAIP Image - 261,532,200 pixels (4 bands, 1 m resolution) What format ? Most data is downloaded in a compressed format Large file sizes Level 1 Data Corrected for radiometric and geometric accuracy GeoTIFF data format Separate file for each band
Commercial SPOT 1986-2014 (1.5 20m) IKONOS 1999 (1 -4 m) Quickbird 2001 (0.60 - 2.4 m) World-View-2 2009 (0.46 1.84m)
WorldView-3 2014 (0.31 3.7 m) Disaster Monitoring Constellation (DMC) 2002-Present Five satellites, 30-40 m in 3-4 bands Electromagnetic Radiation Most remotely sensed data is derived from Electromagnetic Radiation (EMR). This includes:
Visible light Infrared light (heat) X-Rays Radar Etc. To use RS data we need to review some information on EM
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