Aplicación del método de simulación secuencial directa para la evaluación de la incertidumbre local en modelos digitales de elevaciones
- Delgado García, Jorge
- Soares, Amilcar
- Pérez García, José Luis
- Carvalho, Julia
ISSN: 1578-5157
Year of publication: 2007
Issue: 7
Type: Article
More publications in: Geofocus: Revista Internacional de Ciencia y Tecnología de la Información Geográfica
Abstract
This paper presents a method for evaluating local uncertainty due to the modelling process in a DEM generation. Local uncertainty is a basic aspect to determine the final quality of the DEM and it is crucial in order to establish the capabilities of use of the model. The proposed methodology is based in the use of geostatistical simulation procedure that provides ¿possible versions¿ of the reality from limited terrain information (XYZ terrain points). The simulated model generated by the geostatistical simulation procedure (direct sequential simulation) allows for obtaining the cdf of the elevation in each grid node. Using this cdfs it is possible to calculate the uncertainty of the DEMs (variance, interquartile range, entropy) through a simple probabilistic analysis and several realisations of DEM that preserves the statistical characteristics of the measured data (histogram, variogram,¿).