Publication: Análisis espacio-temporal de los cambios de usos del suelo en la
Cuenca del Río Segura
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Date
2020-04-03
Authors
Alonso Sarriá, Francisco ; Gomariz Castillo, Francisco ; Cánovas García, F. ; Moreno Brotóns, J.
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Instituto del Agua y Medio Ambiente, Universidad de Murcia, Campus de Espinardo
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DOI
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info:eu-repo/semantics/other
Description
Abstract
Land use change is a dynamic process that affects heavily to different environmental
processes. In this work, a GIS application is designed to analyse land use changes from
landsat imagery since 1976 to 2007, a period with important socioeconomic and land use
changes in River Segura Basin.
This work describes the methodology used to obtain a yearly series of land cover maps of
the Demarcación Hidrográfica del Segura (River Segura basin in South East Spain). In order
to analyze this great amount of information for a large (more than 18,000 km2) and
heterogeneous area, a unified methodology has been developed.
It has been used a supervised classification improved by a previous not supervised
classification using both spectral (4 or 6 landsat solar spectrum bands depending on the
sensor available, MSS or TM, ETM) and two textural variables. The last ones were obtained
estimating the semivariogram frunction from the albedo and NDVI layers. Having used two
images from different seasons, the total number of variables included in the classification is
12 or 16 depending on the year.
Preliminary results show a reduction of the surfaces with traditional dry crop uses and the
important increase of irrigation lands during the first half of the 1980s decade. The increase
in bare soil areas also reflects the abandonment of traditional crops. Finally, it has been
observed an increase in urban areas attributable to demographic trends.
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