Integration of digital elevation model and spectral radiance for topographic normalization of Landsat TM imagery

M. P. Bogliolo; Maria Fabrizia Buongiorno; Stefano Salvi

doi:10.1117/12.197225

21 December 1994 Integration of digital elevation model and spectral radiance for topographic normalization of Landsat TM imagery

M. P. Bogliolo, Maria Fabrizia Buongiorno, Stefano Salvi

Author Affiliations +

Proceedings Volume 2318, Recent Advances in Remote Sensing and Hyperspectral Remote Sensing; (1994) https://doi.org/10.1117/12.197225
Event: Satellite Remote Sensing, 1994, Rome, Italy

Abstract

The so-called topographic effect in remote sensed images is caused by the different orientation of the terrain surface relative to the light source and the sensor position. It produces a variation in the spectral radiances associated with a given cover type and causes problems in image classification and interpretation due to the increased in-band variance for theoretically homogeneous classes. Different techniques have been proposed in the literature to reduce the topographic effect. The method presented here is based on the modeling of the radiances reflected by a Lambertian surface. A normalization coefficient is derived from a simplified radiative transfer equation and is used to reduce, for each pixel of the image, the reflected radiances to the values they would have on a horizontal surface; the unknown atmospheric parameters are empirically evaluated by an iterative process for variance minimization of radiance values in a few significant sites. We apply the method to a Landsat TM image for which we obtained an accurate DEM. To define the value of the unknown parameters, the correction is first applied to a number of training areas, characterized by both homogeneous cover and rugged topography. Using these values the correction can be finally extended to the entire image. Misregistration of DEM and TM images and local changes in atmospheric parameters appear to be the major sources of error, as well as the deviation of the surface response from a purely Lambertian model.

Citation Download Citation

M. P. Bogliolo, Maria Fabrizia Buongiorno, and Stefano Salvi "Integration of digital elevation model and spectral radiance for topographic normalization of Landsat TM imagery", Proc. SPIE 2318, Recent Advances in Remote Sensing and Hyperspectral Remote Sensing, (21 December 1994); https://doi.org/10.1117/12.197225

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Sensors

Earth observing sensors

Landsat

Reflectivity

Atmospheric modeling

Bidirectional reflectance transmission function

Image processing

Show All Keywords

Keywords/Phrases

Search In:

Publication Years