Spruce is an economically important tree species for the forestry industry in Norway. In recent years, with frequent periods of drought, it has been observed that spruce in several areas is susceptible to drought stress, which can lead to the death of trees either as a direct consequence of the drought or indirectly following bark beetle attacks. Therefore, there is a need to develop a mapping system that can provide a quick overview of the degree of drought stress for spruce stands within a given planning area.

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