ahmad125 Posted April 15, 2014 Report Share Posted April 15, 2014 Hi friends What is different between Reflectance and Radiance? please help me Thanks Quote Link to comment Share on other sites More sharing options...
Cactuz Posted April 15, 2014 Report Share Posted April 15, 2014 Digital Number, Radiance, and Reflectance Author: Peg Shippert / Friday, August 23, 2013 http://www.exelisvis.com/Home/NewsUpdates/TabId/170/ArtMID/735/ArticleID/13592/Digital-Number-Radiance-and-Reflectance.aspx 1 Quote Link to comment Share on other sites More sharing options...
Lurker Posted April 15, 2014 Report Share Posted April 15, 2014 from above article, I quote for you : Digital Number (DN) The generic term for pixel values is Digital Number or DN. It is commonly used to describe pixel values that have not yet been calibrated into physically meaningful units. Radiance Radiance is the amount of radiation coming from an area. To derive a radiance image from an uncalibrated image, a gain and offset must be applied to the pixel values. These gain and offset values are typically retrieved from the image's metadata or received from the data provider. Reflectance Reflectance is the proportion of the radiation striking a surface to the radiation reflected off of it. Some materials can be identified by their reflectance spectra, so it is common to correct an image to reflectance as a first step toward locating or identifying features in an image. 2 Quote Link to comment Share on other sites More sharing options...
peralta2794 Posted April 16, 2014 Report Share Posted April 16, 2014 Radiancia: medida de energia la cantidad reflejado hacia el espacio (absoluto) Reflectancia: porcentaje de la radiancia incidente reflejado hacia el espacio (relativo) Quote Link to comment Share on other sites More sharing options...
ahmad125 Posted April 17, 2014 Author Report Share Posted April 17, 2014 Thanks to all Quote Link to comment Share on other sites More sharing options...
msig0000 Posted April 17, 2014 Report Share Posted April 17, 2014 (edited) If i am not wrong,In the context of satellite imagery-- Radiation is incoming in terms of earth surface Reflection is outgoing in terms of earth surface Edited April 17, 2014 by msig0000 Quote Link to comment Share on other sites More sharing options...
ahmad125 Posted December 3, 2015 Author Report Share Posted December 3, 2015 Hi When we use radiance and when we use reflectance in remote sensing??? Quote Link to comment Share on other sites More sharing options...
pasfans01 Posted December 3, 2015 Report Share Posted December 3, 2015 in a short explanation you would use radiance if you only doing landuse landcover classification using hard classification (i.e nearest neighbour, paralelepiped, maximum likelihood classification) you would use reflectance if you want to extract some biophysical data from imagery spectral information (i.e vegetation water content, fPAI, percentage vegetation cover, soil moisture etc), or Landuse/landcover soft classification (i.e spectral unmixing, spectral angle mapper, artificial neural network, etc) 1 Quote Link to comment Share on other sites More sharing options...
ahmad125 Posted December 4, 2015 Author Report Share Posted December 4, 2015 in a short explanation you would use radiance if you only doing landuse landcover classification using hard classification (i.e nearest neighbour, paralelepiped, maximum likelihood classification) you would use reflectance if you want to extract some biophysical data from imagery spectral information (i.e vegetation water content, fPAI, percentage vegetation cover, soil moisture etc), or Landuse/landcover soft classification (i.e spectral unmixing, spectral angle mapper, artificial neural network, etc) Thanks Do you have the resources to introduce? Quote Link to comment Share on other sites More sharing options...
pasfans01 Posted December 6, 2015 Report Share Posted December 6, 2015 actually I got this knowledge after I read bunch of books uploaded in this forum , so just explore the ebooks section bruh Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.