surface reflectance formula
November 13th, 2020

What kind of overshoes can I use with a large touring SPD cycling shoe such as the Giro Rumble VR? The paper mentions its using a surface reflectance as well for this formula. My question is, is this formula wrong? Mediterranean Mountainous Site." How to place 7 subfigures properly aligned? Thanks for contributing an answer to Geographic Information Systems Stack Exchange! Why were there only 531 electoral votes in the US Presidential Election 2016? Transmittance and reflectance are closely related concepts. What is this part which is mounted on the wing of Embraer ERJ-145? surface will rarely be found. Difference between Albedo and Surface Reflectance, Landsat8 DN to TOA Reflectance (minus values). bertian surface, identically illuminated and viewed (Woodham and Gray, 1987; Yang and Vidal, 1990). Thanks a lot, that is very helpful. How did a pawn appear out of thin air in “P @ e2” after queen capture? Or does some other processing need to be done to my Earth Explorer Surface Reflectance Product. Asking for help, clarification, or responding to other answers. Landsat TM, ETM+ Imagery and the SPOT VEGETATION Albedo Product in a It makes sense now and I can get some plausible results. Why Is an Inhomogenous Magnetic Field Used in the Stern Gerlach Experiment? The inside of the integrating sphere was painted with several coats of a matte white metal spray paint Cloud 33. An 8.5 inch by 11 inch aluminum panel was treated with the same paint and used to … When I calculate NDWI using the original images, the lakes and surrounding area can be distinguished clearly. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. Convertion of spectral indices formulas from Landsat to Sentinel. Why do I need to turn my crankshaft after installing a timing belt? Albedo = 0.493Band2 + 0.203 Band + 0.150 Band5 + 0.154Band, Or does some other processing need to be done to my Earth Explorer Surface Reflectance Product. The material of interest in this study is the painted metal surface used in the integrating sphere. The equation you listed is just a quick approximation, which should give you a general idea of how albedo changed. What's the implying meaning of "sentence" in "Home is the first sentence"? fectly diffusing surface, and for the materials. The flux received on a surface depends on its orientation with respect to the light source. https://landsat.usgs.gov/landsat-surface-reflectance-high-level-data-products. The project is to measure albedo changes for the tongue of a glacier and I'm using R programming to do it. Do other planets and moons share Earth’s mineral diversity? How to use Landsat surface reflectance pixel quality band? To learn more, see our tips on writing great answers. Lovecraft (?) How do rationalists justify the scientific method, What would result from not adding fat to pastry dough, Solve for parameters so that a relation is always satisfied. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. However, the values for these cells are higher than expected, around 2000 depending on the band. I'll have a look at that paper tomorrow and maybe see which equation works best. Are landsat 8 SR and TOA rasters calibrated/corrected data or the data to be used for calibration/correction? So if you are just using this for a simple comparison, I would say it’s good enough, as long as you are using surface reflectance (instead of TOA). It is a measurable de- scriptive of the reflection characteristics of the surface and in- variant to the atmosphere or topography. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. story about man trapped in dream. So I got my data from earth explorer and went for the surface reflectance product in order to save some steps. When light passes through any surface or material, it can be transmitted, reflected, or absorbed. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. See this document for more details: https://landsat.usgs.gov/sites/default/files/documents/ledaps_product_guide.pdf, Converting Landsat surface reflectance data to albedo is actually much more complicated than applying a single equation. Why is it easier to carry a person while spinning than not spinning? Surface reflectance is also understood to be specifically limited to a narrow waveband or single wavelength. My question is, is this formula wrong? The general expression for reflectivity is derivable from Fresnel's Equations.For purposes such as the calculation of reflection losses from optical instruments, it is usually sufficient to have the reflectivity at normal incidence. Making statements based on opinion; back them up with references or personal experience. "Comparison between Snow Albedo Obtained from The paper mentions its using a surface reflectance as well for this formula. http://yceo.yale.edu/how-convert-landsat-dns-albedo, The Landsat reflectance data you downloaded from USGS has been scaled using a scale factor of 0.0001. I will be watching for a trend through time, so their accuracy is not terribly important to me. How to efficiently check if a matrix is a Toeplitz Matrix. In a multiwire branch circuit, can the two hots be connected to the same phase? 2006). What modern innovations have been/are being made for the piano. Is a software open source if its source code is published by its copyright owner but cannot be used without a commercial license? Normal Reflection Coefficient The reflectivity of light from a surface depends upon the angle of incidence and upon the plane of polarization of the light. A quantitative treat- The necessary data field is re-ment of a physically more realistic duced from two dimensions to one Numerical examples are included. The transmittance of a surface or material is defined as the part of the light that moves through the other side of the surface. A Lambertian surface is a surface where reflected radiant flux is constant at any angle throughout the surface (Jensen 2009). band name for landsat surface reflectance product. It only takes a minute to sign up. Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. Pimentel, Rafael, et al. It does seem too simple, but I think for my purposes it will work. If you are really interested in this and want to know more, you can take a look at this paper: http://www.sciencedirect.com/science/article/pii/S0034425711001477.

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