This stage should begin in Year 1, but can be implemented gradually using pilot studies that establish sample plots that will ultimately be incorporated into the overall survey. Costs are summarized in Sections 9 and 10. Remote sensing by earth observation and meteorological satellites provides a large and expanding number of potentially useful data sets. GIS methods also allow the efficient use of other geographically referenced data that are, to an increasing degree, captured by digital mapping methods. For financial and other reasons it is not feasible to use all possible data sources.
Priorities have to be set.
A detailed plan, however, would require reliable information on the extent to which diffeent types of data contribute to the assessment and prediction of forest health in Ontario. Much of this information will only be available after initial tests and pilot studies have been conducted under Ontario conditions. The proposed pilot studies, which are described below, reflect recommended priorities, based on existing knowledge and expert opinions. New directions and procedures will inevitably follow as the results from initial tests are evaluated. The major objective of Stage 3 is to measure and observe the physiological and physical manifestations of declines in forest health and develop models to quantify changes in health condition.