Proceedings of the Symposium on Global and Environmental Monitoring: Proceedings of the Symposium on Global and Environmental Monitoring

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Persistent identifier:: 856665355

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts ; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856665355

Language:: English

Document type:: Multivolume work

Volume

Persistent identifier:: 856669164

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Scope:: XIV, 912 Seiten

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856669164

Illustration:: Illustrationen, Diagramme, Karten

Signature of the source:: ZS 312(28,7,1)

Language:: English

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: International Society for Photogrammetry and Remote Sensing, Commission of Photographic and Remote Sensing Data

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: [WP-3 FOREST INVENTORY APPLICATIONS]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: APPLICATION OF THE WEIGHTED DIFFERENCE VEGETATION INDEX TO SATELLITE DATA. Dr. J. G. P. W. Clevers

Document type:: Multivolume work

Structure type:: Chapter

443 O -\ 1 1 1 1 1 1 i 1 1 | r—1 I | O 10 20 30 40 50 60 70 TM band 3 Figure 3. Feature space plot of TM band 4 Figure 6. Greenness plotted against WDVI against band 3. 1 = water 2 = town 3 = light soil 4 = darker soil (mixed) 5 = vegetation 6 = dense vegetation The resulting image for this WDVI sat is given in Fig. 4. (5) Calculation of Greenness The Greenness for TM data (after offset correction) may be calculated by using the coefficients given by Crist & Cicone (1984) in a global (not site-specific) way. These coefficients are provided in Table 3. In Fig. 5 the image of the Greenness is given. Comparison of Figs. 4 and 5 confirmes the statement in section 2.2 that the WDVI and the Greenness are much alike. In Fig. 6 the Greenness is plotted against the WDVI sat for the training set. The deviance from a straight line is small (r = 0.997). 5. CONCLUSIONS The WDVI can be applied to satellite data, yielding results comparable to the Greenness of Kauth & Thomas (1976). As a result, for many applications not all TM bands are needed, but only bands 3 and 4 may yield the information needed. This induces a considerable simplification of data analysis. Subsequently, a straightforward estimation of crop characteristics, such as LAI, is possible. Like the Greenness, the WDVI does not correct for atmospheric influence in a multitemporal analysis. Some other procedure for atmospheric correction has to be applied, e.g. darkest pixel method combined with spectrally stable (in time) ground features. Further research will focus on the latter aspect. Table 3. Thematic Mapper tasseled cap coefficients. Feature 1 2 TM Band 3 4 5 7 Brightness 0.3037 0.2793 0.4743 0.5585 0.5082 0.1863 Greenness -0.2848 -0.2435 -0.5436 0.7243 0.0840 -0.1800 Wetness 0.1509 0.1973 0.3279 0.3406 -0.7112 -0.4572 Fourth -0.8242 0.0849 0.4392 -0.0580 0.2012 -0.2768 Fifth -0.3280 0.0549 0.1075 0.1855 -0.4357 0.8085 Sixth 0.1084 -0.9022 0.4120 0.0573 -0.0251 0.0238

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