Finally, the GEMI is a good tool and an important support for classification and temporal monitoring of the boreal forest. Qu bec by A.A. Viau, P. Daloze, R. Audet and F. Paquet Crop phytoprotection is very important in Quebec and in Canada. It is therefore important to ensure good crop monitoring and to have access to tools allowing us the design of the most appropriate strategies for phytoprotection intervention. The estimate of the damage caused by crop enemies is derived from specific crop models based on meteorological data, such as air temperature, precipitation and relative humidity, measured by meteorological network. The current network does not respond adequately to their needs in phytoprotection.
Agricultural counsellors have to use other ways to acquire or estimate the data.
They have therefore recourse to the use of phytoprotection models, based on the spatio-temporal modelling of agrometeorological and environmental data. This implies the estimation of agrometeorological parameters at all points of the territory. Improved agreement is achieved when the standard global retrieval formula for satellite SST is modified in accordance with the conditions of this region. Residual errors are assumed due to presence of undetected this cloud. Following the principle of fuzzy mathematics, thin cloud and clear sky are defined in terms of the difference of SST between satellite image and buoy data.