When evaluating programmes that have a clear spatial dimension, the use of geographic data (Geodata) and methods offer many benefits: Geodata constitute an objective measure of environmental change, are more cost-effective than survey data, allow evaluations in remote or dangerous locations, and permit the retrospective collection of baseline data. This article introduces the Geodata Decision Tree as a set of guiding questions that help evaluators to decide when and how to use Geodata.
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