Community Research and Development Information Service - CORDIS


Two alternative methods (square sites and strips) have been developed for selecting sample sites for satellite image analysis giving priority to a particular type of area (intensive agricultural or forest) when no suitable stratification is available. Both methods are based on two-phase sampling. For square sites, a systematic sample is first drawn on the Systeme Probatoire d'Observation de la Terre (SPOT) reference grid. Pre-selected sites are visually photo-interpreted for a rough estimation of the percentage of agricultural land or forest, that determines the sampling probability in the second phase. The alternative scheme, based on thin satellite image strips, seems to be more efficient than sampling square sites according to a simulation study based on ground survey data in Spain.

Additional information

Authors: GALLEGO F J, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Second International Symposium on Spatial Accuracy, Fort Collins (US), May 21-23, 1996
Availability: Available from (1) as Paper EN 39711 ORA
Record Number: 199610630 / Last updated on: 1996-05-27
Original language: en
Available languages: en