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Forest resources assessment and monitoring

Year of publication 2009

Author Forestry Economics and Policy Division

Product type Meeting

Edition 1

Meeting symbol FO:AFWC/2010/6.2

Language English

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    Book (stand-alone)
    NAFORMA: National Forest Resources Monitoring and Assessment of Tanzania Mainland
    Sampling Design Options for 2nd Biophysical Inventory (NAFORMA II)
    2022
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    Three options for the sampling design of the field plot clusters of NAFORMA II biophysical survey are compared in this report. Option 1 consists of re-measuring all NAFORMA I field sample plots (3 205 clusters) and Option 2 of re-measuring only those that were established as permanent (848 clusters). The recommended Option 3 is a compromise between these two “extreme” options: Re-measure a subset (1 405 clusters) of NAFORMA I field sample plots including (almost) all permanent clusters and a carefully selected set of other NAFORMA I field plot clusters to obtain a uniform sample within each TFS zone. Design Option 3 has the following features: • Sampling intensity is uniform within each TFS zone. This makes it simple to use the data. For example, mean volumes can be estimated by averages over the plots. • The selected clusters are well-spread over the target population. • The anticipated precision of land-class area and mean wood volume relative to sample size is nearly as good as that of NAFORMA I. • All proposed clusters were measured in NAFORMA I, which enables precise estimation of change based on repeated measurements. The costs and precision were anticipated by utilizing NAFORMA I field data, information about subsequent improvements in the road network, and changes in land-use using satellite imaging derived land-class maps.
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    Document
    Terminal evaluation of the project “Forest Resources Assessment and Monitoring to Strengthen Forestry Policy and Knowledge Framework”
    Project code: GCP/AZE/007/GFF - Management response
    2022
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