Estimation of topographic effects in NVI data obtained from satellite images

Author

Kusaka, T. ; Sakane, M.

Author_Institution

Kanazawa Inst. of Technol., Ishikawa, Japan

Volume

2

fYear

1997

fDate

3-8 Aug 1997

Firstpage

972

Abstract

The topographic effects in Normalized Vegetation Index (NVI) data obtained from Landsat TM data and NOAA AVHRR data are estimated. It is assumed that the topographically induced radiance variations can be estimated by the cosine of the angle, γ, between the direction of the Sun and the local surface normal. Digital terrain data sampled with the grid width 50 m are used to evaluate γ. By comparing NVI data derived from satellite data with γ-data, the following results were obtained: (1) The correlation between NVI and VI data derived from Landsat TM data and γ-data is high. (2) The correlation between NVI data derived from NOAA AVHRR data and γ-data is also significant

Keywords

geophysical techniques; remote sensing; IR imaging; Landsat TM; NVI; Normalized Vegetation Index; geophysical measurement technique; infrared; land surface; land surface topography; local surface normal; multispectral remote sensing; optical imaging; remote sensing; satellite image; topographic effect; topographically induced radiance variation; vegetation mapping; visible; Atmosphere; Infrared sensors; Lighting; Optical scattering; Optical sensors; Remote sensing; Satellites; Sun; Surface topography; Vegetation mapping;

fLanguage

English

Publisher

ieee

Conference_Titel

Geoscience and Remote Sensing, 1997. IGARSS '97. Remote Sensing - A Scientific Vision for Sustainable Development., 1997 IEEE International

Print_ISBN

0-7803-3836-7

Type

conf

DOI

10.1109/IGARSS.1997.615314

Filename

615314