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TIMESAT - a program for analyzing time-series of satellite sensor data

Author:
  • Per Jönsson
  • Lars Eklundh
Publishing year: 2004
Language: English
Pages: 833-845
Publication/Series: Computers & Geosciences
Volume: 30
Issue: 8
Document type: Journal article
Publisher: Pergamon

Abstract english

Three different least-squares methods for processing time-series of satellite sensor data are presented. The first method uses local polynomial functions and can be classified as an adaptive Savitzky-Golay filter. The other two methods are more clear cut least-squares methods, where data are fit to a basis of harmonic functions and asymmetric Gaussian functions, respectively. The methods incorporate qualitative information on cloud contamination from ancillary datasets. The resulting smooth curves are used for extracting seasonal parameters related to the growing seasons. The methods are implemented in a computer program, TIMESAT, and applied to NASA/NOAA Pathfinder AVHRR Land Normalized Difference Vegetation Index data over Africa, giving spatially coherent images of seasonal parameters such as beginnings and ends of growing seasons, seasonally integrated NDVI and seasonal amplitudes. Based on general principles, the TIMESAT program can be used also for other types of satellite-derived time-series data.

Keywords

  • Atom and Molecular Physics and Optics
  • Physical Geography
  • NOAA
  • TIMESAT
  • phenology
  • seasonality
  • function fitting
  • data smoothing
  • CLAVR
  • NDVI
  • AVHRR

Other

Published
  • TIMESAT - software to analyze time-series of satellite sensor data
  • ISSN: 1873-7803
E-mail: lars [dot] eklundh [at] nateko [dot] lu [dot] se

Professor

Dept of Physical Geography and Ecosystem Science

+46 46 222 96 55

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Teaching staff

Dept of Physical Geography and Ecosystem Science

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Department of Physical Geography and Ecosystem Science
Lund University
Sölvegatan 12
S-223 62 Lund
Sweden

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