@G{�5��1z�S ::s0���ħ t��x\�&l|�T� t�r0~9ש /��lI���:���g���r�sx@?���=�NA ����њ�7JKA ����;��=o��� �ѷC/�x�4�h����y�Fi 1) �=��� "S ::s0���ħ t��x\�&x�4�Y( ���Q����Fi a) m?��{���Fi 3R z�Figx�4� ���Ϻc��s�Fi q( };��7J�FA �h��o��� ����pM�( 2��3� For each scene you need to know the distance between the sun and earth in astronomical units, the day of the year (Julian date), and solar zenith angle. dn2radiance | dn2reflectance | empiricalLine | hypercube | iarr | sharc. each spectral bands respectively. 3.3. Remove the bad spectral bands from the data cube. The Instead, we're going to write a script to automatically read the parameters from the metadata file and then apply the DN-to-relectance transform to each of our bands. Certain remote sensing applications (e.g. Read and display the 80th spectral band in the input radiance and the output reflectance data. Level-2 pixel identification starts with reading of the INVALID flag of the Level-1B product. MathWorks is the leading developer of mathematical computing software for engineers and scientists. Describe the specific ways that you would need to modify the above script if you wanted to perform a DN-to-radiance transformation instead of the DN-to-reflectance we performed. angle. Other MathWorks country sites are not optimized for visits from your location. First you must convert DNs to radiance values, then you need to convert these radiance values to reflectance values. (3 marks). @u 2 0 obj ESUNλ is the mean solar irradiance for each %PDF-1.5 %���� A modified version of this example exists on your system. %PDF-1.5 pixels values in the output data cube are top of atmosphere (TOA) reflectance Convert radiance to reflectance. The Metadata property of object stores the hyperspectral data cube. The function returns a new hypercube object and the pixel values of the data cube represent the top of atmosphere (TOA) reflectance. Share To: ... (TOA) reflectance and/or radiance using radiometric rescaling coefficients provided in the product metadata file (MTL file), as briefly described below. �Q@| This process aims to extract the input Level-1B data and convert the included radiance into reflectance through three main steps. endobj What do you think this difference may imply about the pre-processing that was done on the imagery before it was made available? values. Landsat 8 data Conversion to TOA Radiance, Reflectance and Temperature. NOTES: •“PI” variable can be found in DATA GENERATION •X**2 is the same as X2 •Be very careful of parentheses •Save your model often … The 1 above to convert each of the bands within our scene data set manually. Remove the bad spectral bands from the data cube. @u endstream endobj startxref Other MathWorks country sites are not optimized for visits from your location. The process of calibrating raw satellite imagery into reflectance values may include several steps, often including a conversion of DN to radiance, a model for removing the effects of varying illumination within the scene (due to the sun angle, the earth-sun distance, terrain, and clouds and cloud shadows), and an atmospheric correction model. object stores the hyperspectral data cube. pixels values in the output data cube are top of atmosphere (TOA) reflectance Once you have successfully run the script, display each of the five transformed bands using your visualization software. Transforming band 1...). values. h�b```f``�c`a`��e�c@ >&V�8��5�k�t��`n���j8�N�@,ֵ��������!��,��Ӎ��2,�p��CW�����6 iF nb�s"P�_� �� Choose a web site to get translated content where available and see local events and offers.