Community Research and Development Information Service - CORDIS


This document concerns the feasibility of an alternative sampling scheme to the current rapid estimates in the European Union of the MARS project based on 60 sites of 40 km by 40 km. The alternative scheme would have long narrow sites. The site would be a strip as long as the whole territory of the European Community along a satellite orbit track. The width of the site would be about 1 km. Inside each site, segments would be sampled with a probability proportional to an index of agricultural intensity. In order to compare the relative efficiency of different sampling strategies, simulations have been made on available data for 8000 ground survey segments from the Spanish Ministry of Agriculture in an area of about 270.000 km{2} in 1992 and 1993. Sampling scattered segments turns out to be much more efficient than sampling segments clustered by square sites. The efficiency of the strips approach is in between: lower than scattered segments but higher than square sites.

Additional information

Authors: GALLEGO F J, JRC Ispra (IT);CARFAGNA E, University of Bologna, Department of Statistics (IT)
Bibliographic Reference: Paper presented: Seminaire Esquilino, Roma (IT), November 27-29, 1995
Availability: Available from (1) as Paper EN 39590 ORA
Record Number: 199610416 / Last updated on: 1996-04-15
Original language: en
Available languages: en