Radiance to reflectance conversion effects on landsat TM images

Abstract EN

In this research digital numbers (DNs) for Landsat-5 TM images was converted to reflectance values, at first DNs converted to radiance by corrected for Gain and Offset values of the particular spectral TM band.

Then converted these radiance values to spectral reflectance by correcting the atmospheric effects.

To study the effects of the conversion, digital image processing techniques were applied for both images (DNs and Reflectance), such as enhancement by histogram equalization, and geometrical correction.

Image classification (supervised and unsuperviscd) also applied as comparative criteria.

The analysis of the results shows that the reflectance image gave better classification accuracy for supervised and unsupcrvised classification than image DNs while conversion DNs to rcflectanco image does not affect its geometrical properties.