Applied Geomatics

, Volume 4, Issue 4, pp 245–255 | Cite as

Analysis of parcel-based image classification methods for monitoring the activities of the Land Bank of Galicia (Spain)

  • T. Hermosilla
  • J. M. Díaz-Manso
  • L. A. Ruiz
  • J. A. Recio
  • A. Fernández-Sarría
  • P. Ferradáns-Nogueira
Original Paper

Abstract

The abandonment of agricultural plots entails a low economic productivity of the land and a higher vulnerability to wildfires and degradation of affected areas. In this sense, the local government of Galicia is promoting new methodologies based on high-resolution images in order to classify the territory in basic and generic land uses. This procedure will be used to control the sustainable management of plots belonging to the Land Bank. This paper presents an application study for maintaining and updating land use/land cover geospatial databases using parcel-oriented classification. The test is performed over two geographic areas of Galicia, in the northwest of Spain. In this region, forest and shrublands in mountain environments are very heterogeneous with many private unproductive plots, some of which are in a high state of abandonment. The dataset is made of high spatial resolution multispectral imagery, cadastral cartography employed to define the image objects (plots), and field samples used to define evaluation and training samples. A set of descriptive features is computed quantifying different properties of the objects, i.e. spectral, texture, structural, and geometrical. Additionally, the effect on the classification and updating processes of the historical land use as a descriptive feature is tested. Three different classification methodologies are analyzed: linear discriminant analysis, decision trees, and support vector machine. The overall accuracies of the classifications obtained are always above 90 % and support vector machine method is proved to provide the best performance. Forest and shrublands areas are especially undefined, so the discrimination between these two classes is low. The results enable to conclude that the use of automatic parcel-oriented classification techniques for updating tasks of land use/land cover geospatial databases, is effective in the areas tested, particularly when broad and well defined classes are required.

Keywords

Object-based classification Change detection High-resolution imagery Mapping Agriculture 

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Copyright information

© Società Italiana di Fotogrammetria e Topografia (SIFET) 2012

Authors and Affiliations

  • T. Hermosilla
    • 1
  • J. M. Díaz-Manso
    • 2
  • L. A. Ruiz
    • 1
  • J. A. Recio
    • 1
  • A. Fernández-Sarría
    • 1
  • P. Ferradáns-Nogueira
    • 2
  1. 1.GeoEnvironmental Cartography and Remote Sensing Research GroupUniversitat Politècnica de ValènciaValenciaSpain
  2. 2.Sociedade para o Desenvolvemento Comarcal de GaliciaSantiago de CompostelaSpain

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