Comparison of earth observing-1 ALI and Landsat ETM+ for crop identification and yield prediction in Mexico

David B. Lobell, Gregory P. Asner

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

This paper presents a comparison of Earth Observing 1 (EO-1) Advanced Land Imager (ALI) and Landsat-7 Enhanced Thematic Mapper Plus (ETM+) images collected over an agricultural region in northwest Mexico. Across 115 fields with a range of cover types, radiance measurements collected by ALI were within 3% of ETM+ for all five common bands. Crop discrimination was significantly improved with ALI compared to ETM+, with an increase from 85% to 95% accuracy for distinguishing maize from wheat fields. This improvement was attributed to the greater SNR in ALI, as well as the unique information content of ALI band 4p (0.84-0.89 μm), which may be due to sensitivity to canopy water content. Yield predictions from reflectance-calibrated data did not reveal significant differences between the sensors. The greatest distinction between ALI and ETM+ was observed in the panchromatic band, with ALI providing more detailed information on inter- and intrafield radiance differences, which show promise for precision agriculture applications. We conclude that ALI meets or exceeds ETM+ performance for agricultural applications evaluated here, thus providing a plausible option for continuity of the valuable Landsat record.

Original languageEnglish (US)
Pages (from-to)1277-1282
Number of pages6
JournalIEEE Transactions on Geoscience and Remote Sensing
Volume41
Issue number6 PART I
DOIs
StatePublished - Jun 1 2003
Externally publishedYes

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Keywords

  • Advanced land imager (ALI)
  • Enhanced thematic mapper plus (ETM+)
  • Remote sensing

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Earth and Planetary Sciences(all)

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