- AutorIn
- Christine Wessollek Institute of Photogrammetry and Remote Sensing, Technische Universität Dresden
- Babatunde OsunmadewaInstitute of Photogrammetry and Remote Sensing, Technische Universität Dresden
- Pierre KarraschProfessorship of Geoinformation Systems, Technische Universität Dresden
- Titel
- Introducing a rain-adjusted vegetation index (RAVI) for improvement of long-term trend analyses in vegetation dynamics
- Zitierfähige Url:
- https://nbn-resolving.org/urn:nbn:de:bsz:14-qucosa2-350579
- Konferenz
- SPIE Remote Sensing. Toulouse, 21.-24. September 2015
- Quellenangabe
- Earth Resources and Environmental Remote Sensing/GIS Applications VI
Herausgeber: Ulrich Michel, Karsten Schulz, Manfred Ehlers, Konstantinos G. Nikolakopoulos, Daniel Civco
Erscheinungsort: Bellingham, Wash.
Verlag: SPIE
Erscheinungsjahr: 2015
Titel Schriftenreihe: Proceedings of SPIE
Bandnummer Schriftenreihe: 9644 - Erstveröffentlichung
- 2015
- Abstract (EN)
- It seems to be obvious that precipitation has a major impact on greening during the rainy season in semi-arid regions. First results1 imply a strong dependence of NDVI on rainfall. Therefore it will be necessary to consider specific rainfall events besides the known ordinary annual cycle. Based on this fundamental idea, the paper will introduce the development of a rain adjusted vegetation index (RAVI). The index is based on the enhancement of the well-known normalized difference vegetation index (NDVI2) by means of TAMSAT rainfall data and includes a 3-step procedure of determining RAVI. Within the first step both time series were analysed over a period of 29 years to find best cross correlation values between TAMSAT rainfall and NDVI signal itself. The results indicate the strongest correlation for a weighted mean rainfall for a period of three months before the corresponding NDVI value. Based on these results different mathematical models (linear, logarithmic, square root, etc.) are tested to find a functional relation between the NDVI value and the 3-months rainfall period before (0.8). Finally, the resulting NDVI-Rain-Model can be used to determine a spatially individual correction factor to transform every NDVI value into an appropriate rain adjusted vegetation index (RAVI).
- Andere Ausgabe
- Link zum Artikel, der zuerst in der Zeitschrift 'Proceedings of SPIE' erschienen ist.
DOI: 10.1117/12.2192821 - Freie Schlagwörter (DE)
- NDVI, Niederschlag, GIMMS, TAMSAT, Zeitreihen, regenbereinigter Vegetationsindex, Regressionsanalyse
- Freie Schlagwörter (EN)
- NDVI, Rainfall, GIMMS, TAMSAT, time series, rain-adjusted vegetation index, regression analysis
- Klassifikation (DDC)
- 620
- Verlag
- SPIE, Bellingham, Wash.
- Förder- / Projektangaben
- Version / Begutachtungsstatus
- publizierte Version / Verlagsversion
- URN Qucosa
- urn:nbn:de:bsz:14-qucosa2-350579
- Veröffentlichungsdatum Qucosa
- 29.08.2019
- Dokumenttyp
- Konferenzbeitrag
- Sprache des Dokumentes
- Englisch
- Lizenz / Rechtehinweis