PPT-Radiometry and reflectance

15463 15663 15862 Computational Photography Fall 2018 Lecture 16 httpgraphicscscmueducourses15463 Homework 4 is still ongoing Any questions I will try to go over project ideas tonight. The reflectance map depends both on the nature o the surface layers of th object being imaged and the distribution o light sources Recently a unified approach t the specification of surface reflectance in terms of both incident and reflected beam ge Ritva. A. Keski-Kuha, Charles W. Bowers, Manuel A. Quijada. NASA/Goddard Space Flight Center. James B. Heaney, SGT Inc. Greenbelt. Benjamin Gallagher, Ball. . Aerospace & Technologies Corp. Andrew McKay Northrop Grumman Aerospace Systems. Different colors correspond to different wavelengths of visible light. 665 nm. 630 nm. 600 nm. 550 nm. 470 nm. 425 nm. 400 nm. Today’s Lab. If we shine light on an object, some light is absorbed and some is reflected. Dan . Sauceda. Outline. Information on the Region. Data Information. Reflectance Equations. MODIS Images. NDVI. Conclusions. Information on the Region. Latitude: 0. ˚N, -12˚S. Longitude: -56˚. E, -72. Intercomparisons. Lessons Learned. K. Thome. 1. , N. Fox. 2. 1. NASA/GSFC , . 2. National Physical Laboratory. Summarize lessons learned during joint field campaigns to . Tuz. . Golu. , Turkey. 10 countries and 13 organizations. Seung. Hyun (Lucia) Woo. June 20. th. , 2013. Yale University. Outline . Negative Reflectance. Greater than 1 Reflectance. Cyan Pixels. Sensor Saturation. ENVI Service Pack 3 . Calibration Errors. Cirrus Band. and Model Performance. ATMS 792 – Remote Sensing. Outline. Data used / Domain of study . / Hypothesis. Model algorithm. How does this model perform for our region?. 2-D spatial . plots . Scatter . plots. Multiple scattering in cloud or aerosol layers. τ. =0. τ. =. τ. *. Fraction absorbed fraction transmitted fraction reflected = 1. REFLECTED. ABSORBED. TRANSMITTED. Direct & diffuse transmission. Eric . Vermote . et . al.. NASA . Goddard Space Flight Center Code . 619. Eric.f.vermote@nasa.gov.  .  . LCLUC Spring Meeting, April 12-14, Hilton, Rockville, MD. Home . page: . http://modis-sr.ltdri.org. Chengquan. Huang. 1,2. . Min Feng. 1,2. , . Joseph O. . Sexton. 1,2. , . Raghuram. . Narasimhan. 1,2. , . Saurabh. . Channan. 1,2. , Jeff . Masek. 3. , Eric . Vermote. 2. , . Feng. Gao. 4. , John Townshend. Cody . Anderson*, . Dennis . Helder. *, and Jeff Czapla-Myers**. *USGS EROS, **University of Arizona. Level 2 Surface Reflectance Product Validation Thoughts. Surface Reflectance Validation Thoughts (1). (from: METRIC: Mapping Evapotranspiration at high Resolution using Internalized Calibration). University of Idaho, Kimberly, Idaho. University of Nebraska-Lincoln. Landsat – Polar Orbiting. A new image each 16 days. GOES-R Algorithm Working Group Aerosol, Atmospheric Chemistry and Air Quality (AAA) Application Team. 1. Presentations. Suspended Matter/Aerosol Optical Depth Algorithm – . Istvan. Laszlo, STAR. Aerosol Detection Algorithm – . Carol J. Bruegge. Science driver: . The radiometric response of sensors change with time, and must be updated during the mission life. For example, Orbiting Carbon Observatory (OCO) requires 5% radiometric uncertainty in order to meet its XCO2 retrieval uncertainty of 1 ppm. Vicarious calibration provides this, but for sensors that view off-nadir, such as OCO, a necessary input is a model of the test site bi-directional reflectance factor (BRF)..