An 8.5 inch by 11 inch aluminum panel was treated with the same paint and used to … fectly diffusing surface, and for the materials. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. tation of the surface elements with respect to the direction of the incident 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. 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). I will be watching for a trend through time, so their accuracy is not terribly important to me. The paper mentions its using a surface reflectance as well for this formula. It only takes a minute to sign up. "Comparison between Snow Albedo Obtained from To learn more, see our tips on writing great answers. Why is it easier to carry a person while spinning than not spinning? It does seem too simple, but I think for my purposes it will work. Difference between Albedo and Surface Reflectance, Landsat8 DN to TOA Reflectance (minus values). If you are really interested in this and want to know more, you can take a look at this paper: Limitations of Monte Carlo simulations in finance. When I calculate NDWI using the original images, the lakes and surrounding area can be distinguished clearly. Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. 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. How to place 7 subfigures properly aligned? rev 2020.11.24.38066, The best answers are voted up and rise to the top, Geographic Information Systems Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. Also, this is really similar but uses TOA instead of surface reflectance: A Lambertian surface is a surface where reflected radiant flux is constant at any angle throughout the surface (Jensen 2009). 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. Or does some other processing need to be done to my Earth Explorer Surface Reflectance Product. Mediterranean Mountainous Site." Surface reflectance is also understood to be specifically limited to a narrow waveband or single wavelength. Why were there only 531 electoral votes in the US Presidential Election 2016? What if the P-Value is less than 0.05, but the test statistic is also less than the critical value? The flux received on a surface depends on its orientation with respect to the light source. When light passes through any surface or material, it can be transmitted, reflected, or absorbed. Thanks a lot, that is very helpful. The equation you listed is just a quick approximation, which should give you a general idea of how albedo changed. So multiplying the digital number by 0.0001 will give you a value between 0 and 1. My question is, is this formula wrong? It makes sense now and I can get some plausible results. It is a measurable de- scriptive of the reflection characteristics of the surface and in- variant to the atmosphere or topography. Is a software open source if its source code is published by its copyright owner but cannot be used without a commercial license? What is this part which is mounted on the wing of Embraer ERJ-145? an object, the reflectance factor is divided by π assuming the surface is Lambertian (Schaepman-Strub et al. What kind of overshoes can I use with a large touring SPD cycling shoe such as the Giro Rumble VR? What's the implying meaning of "sentence" in "Home is the first sentence"? In a multiwire branch circuit, can the two hots be connected to the same phase? The transmittance of a surface or material is defined as the part of the light that moves through the other side of the surface. Convertion of spectral indices formulas from Landsat to Sentinel. Thanks again. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. bertian surface, identically illuminated and viewed (Woodham and Gray, 1987; Yang and Vidal, 1990). So I got my data from earth explorer and went for the surface reflectance product in order to save some steps. 2006). Landsat TM, ETM+ Imagery and the SPOT VEGETATION Albedo Product in a Making statements based on opinion; back them up with references or personal experience. What modern innovations have been/are being made for the piano. How to use Landsat surface reflectance pixel quality band? The file contains original images and surface reflectance images. from the calibration curve supplied reflection from a surface that is not wit 1 104. h each diffusing at all. Calculating Albedo for Landsat 8 using QGIS with GRASS? However, the values for these cells are higher than expected, around 2000 depending on the band. I'm pretty green when it comes to RS and I'm doing this school project that I need help with., The Landsat reflectance data you downloaded from USGS has been scaled using a scale factor of 0.0001. How did a pawn appear out of thin air in “P @ e2” after queen capture? The formula for defining reflectance comes from geometric considerations. Asking for help, clarification, or responding to other answers. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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. I'll have a look at that paper tomorrow and maybe see which equation works best. The project is to measure albedo changes for the tongue of a glacier and I'm using R programming to do it.


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