Object vs. pixel: A systematic evaluation in urban environments

Soe Myint, Christopher S. Galletti, Shai Kaplan, Won Kyung Kim

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

The objective of this paper is to compare object-based and per-pixel classifiers in a systematic manner using high resolution urban imagery. The prevailing opinion is that object-based methods perform better than single-pixel classifiers, but there has been no formal investigation of this claim using multiple images and identical training samples in a detailed land-cover classification. Furthermore, there has been no standardized study of how different object-based segmentation and scale parameters improve high resolution urban classifications. We used two subsets of QuickBird over Phoenix and Scottsdale, Arizona, to test these issues. Our results show that small-scale segmentation (10) produces higher accuracy. A combination of equally balanced shape and spectral homogeneity (0.5) with compactness parameter of 0.5 is the most effective for image segmentation. The highest overall accuracy was achieved using a per-pixel Minimum distance classifier, but it was only marginally more accurate than the object-based classification.

Original languageEnglish (US)
Pages (from-to)657-678
Number of pages22
JournalGeocarto International
Volume28
Issue number7
DOIs
StatePublished - Nov 1 2013

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Keywords

  • QuickBird
  • object
  • segmentation
  • supervised
  • unsupervised

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Water Science and Technology

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