Drought Estimation Maps by Means of Multidate Landsat
Fused Images
Diego RENZA, Estíbaliz MARTINEZ, Agueda ARQUERO, and Javier SANCHEZ
Department of Architecture and Technology of Computer Systems.
Polytechnic University of Madrid (Spain). Campus de Montegancedo,
28660 Boadilla del Monte, Madrid, Spain
Abstract. The purpose of this paper is to analyze the usefulness of traditional indexes, such as
NDVI and NDWI along with a recently proposed index (NDDI) using merged data for multiple
dates, with the aim of obtaining drought data to facilitate the analysis for government premises. In
this study we have used Landsat 7 ETM+ data for the month of June (2001-2009), which merged
to get bands with twice the resolution. The three previous indices were calculated from these new
bands, getting in turn drought maps that can enhance the effectiveness of decision making