Difference between revisions of "Sample design"
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Prior to inventory, a stratification needs to be done. This is valid also in a complete inventory (when all stands in the analysis area are included), since general inventory parameters are set in this part. | Prior to inventory, a stratification needs to be done. This is valid also in a complete inventory (when all stands in the analysis area are included), since general inventory parameters are set in this part. | ||
| + | A stratum is defined usually based on volume and age from the stand register. The stands (their productive forest land areas) are related to one of the several user-defined strata. The stratum-matrix should first be arranged according to current forest state, and before that, you might want to separate the analysis area (imported in one stand register) into different "levels". A level in this case could be a certain type of forests (e.g., stands with the dominating tree species ''Pinus contorta'') where a certain inventory-scheme should be applied. | ||
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The reason to stratify... | The reason to stratify... | ||
Select the imported stand register, i.e. the analysis area to be in-field inventoried by plotwise sampling in sampled stands (obtaining "strata data"). ... | Select the imported stand register, i.e. the analysis area to be in-field inventoried by plotwise sampling in sampled stands (obtaining "strata data"). ... | ||
Revision as of 15:34, 8 May 2009
Prior to inventory, a stratification needs to be done. This is valid also in a complete inventory (when all stands in the analysis area are included), since general inventory parameters are set in this part.
A stratum is defined usually based on volume and age from the stand register. The stands (their productive forest land areas) are related to one of the several user-defined strata. The stratum-matrix should first be arranged according to current forest state, and before that, you might want to separate the analysis area (imported in one stand register) into different "levels". A level in this case could be a certain type of forests (e.g., stands with the dominating tree species Pinus contorta) where a certain inventory-scheme should be applied.
The reason to stratify...
Select the imported stand register, i.e. the analysis area to be in-field inventoried by plotwise sampling in sampled stands (obtaining "strata data"). ...