Data1 collection is an integral part of developing and updating a greenhouse gas inventory. Formalised data collection activities should be established, adapted to countries' national circumstances, and reviewed periodically as a part of implementing good practice. In most cases generating new source data will be limited by the resources available and prioritisation will be needed, taking account the results of key category analysis set out in Chapter 4, Methodological Choice and Identification of Key Categories. Data collection procedures are necessary for finding and processing existing data, (i.e., data that are compiled and stored for other statistical uses than the inventory), as well as for generating new data by surveys or measurement campaigns. Other activities include maintaining data flows, improving estimates, generating estimates for new categories and/or replacing existing data sources when those currently used are no longer available.
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