DN to Reflectance HONDA Kiyoshi. Contents Definition of NDVI Radiance Reflectance How to Calculate Radiance from DN Irradiance.

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Presentation transcript:

DN to Reflectance HONDA Kiyoshi

Contents Definition of NDVI Radiance Reflectance How to Calculate Radiance from DN Irradiance

Definition of NDVI

Reflectance Ratio of Radiant Energy Reflected to Incident Energy Radiant Energy = Integral of vertical components of Radiance Measured ( by satellite to be scaled back from DN )

DN ? DN ( Digital Number ) you can see in the RS image files is not Reflectance. So you have to derive Reflectance from the DN Then what is DN ?

DN is a scaled Radiance DN is scaled from Radiance measured by sensors

Radiance Energy in unit time, unit solid angle, unit wavelenth

DN to Radiance (L λ ) Have to find out LMAX, LMIN, QCALMAX, QCALMIN QCALMAX QCALMIN

LMIN, LMAX of LANDSAT7 LMIN, LMAX List LMAX LMIN

LANDSAT 7 Gain Setting for January

How to Find the Constants for Scaling factor of Radiance Metadata file.met Sample ftp://cgceopush3.geo.msu.edu/push3_2/137/043/p137r43_7x000228/p137r043_7x met ftp://cgceopush3.geo.msu.edu/push3_2/137/043/p137r43_7x000228/p137r043_7x met Identify Hi-Gain or Low Gain EROS Data Center Gateway Obtain Hi-Gain and Low-Gain parameters USGS LANDSAT Page Header file/record Data Handling Manuals Processed in Japan, China, Thailand ….

How to obtain TOA Irradiance Spectral Exo-atmospheric Irradiance

Average Solar Spectral Irradiance ESUN λ Average Solor Spectral Exo-atmospheric Irradiance ESUN λ for ETM+

Sun Earth Distance d s

Solar Zenith Angle LANDSAT: Use Zenith Angle ( 90deg – Sun Elevation) at the centre of the image for the whole image 180km -> deg If Zenith Angle < 20deg, difference < 1% Or Calculate the angle from Lat, Lon, Julian day and time ( i.e POSSOL of 6S ).

Atmospheric Correction The reflectance we have obtained here is Apparent Reflectance or Reflectance at TOA Atmospheric correction is needed to obtain Reflectance at Ground Level You may run 6S with appropriate parameters Some products are Reflectance at Ground Surface, such as MODIS, SPOT VEGETAION…

References Landsat 7 Science Data Users Handbook Chapter6 Chapter 11 Dr. Kawamura's page DN->Refelctance for Landsat ( Japanese ) ibration/LandsatCalibration.html ibration/LandsatCalibration.html 6S Manual