Resultados de la búsqueda

1. Library Resource

   

   Linear trends in seasonal vegetation time series and the modifiable temporal unit problem

   Artículos de revistas y libros

   Diciembre, 2012

   Argelia, Burkina Faso, Nigeria, Mauritania, Malí, Etiopía, Eritrea, Camerún, Sudán del Sur, República Centroafricana, Senegal, Chad, Níger, Sudán

   Tierra, Cambio Climático y Medio Ambiente

   Degradación de tierras

   Medio ambiente

   Time series of vegetation indices (VI) derived from satellite imagery provide a consistent monitoring system for terrestrial plant productivity. They enable detection and quantification of gradual changes within the time frame covered, which are of crucial importance in global change studies, for example. However, VI time series typically contain a strong seasonal signal which complicates change detection. Commonly, trends are quantified using linear regression methods, while the effect of serial autocorrelation is remediated by temporal aggregation over bins having a fixed width.

2. Library Resource

   

   Overestimating land degradation, underestimating farmers in the Sahel

   Informes e investigaciones

   Diciembre, 2001

   Argelia, Burkina Faso, Nigeria, Mauritania, Malí, Etiopía, Eritrea, Camerún, Sudán del Sur, República Centroafricana, Senegal, Chad, Níger, Sudán

   Ordenación de tierras