Difference between revisions of "Sample design"
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| + | [[Category:PlanWise]] | ||
| + | [[Category:StandWise]] | ||
| + | [[Category:RegWise]] | ||
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| + | [[:User's guide to PlanWise]] | ||
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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 some general inventory parameters are set in this part. Considering cost-efficiency, the inventory is commonly based on a two-stage sampling procedure. Here, this starts with selecting the imported stand register of interest, i.e. the analysis area to be in-field inventoried by plotwise sampling in PPS-sampled stands. | 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 some general inventory parameters are set in this part. Considering cost-efficiency, the inventory is commonly based on a two-stage sampling procedure. Here, this starts with selecting the imported stand register of interest, i.e. the analysis area to be in-field inventoried by plotwise sampling in PPS-sampled stands. | ||
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| + | ===Instruction=== | ||
| + | # In PlanWise, open an existing project or create a new one. | ||
| + | # From the top menu "Data Management" (Datahantering), select "Sample Design" (Stickprovsdesign). | ||
| + | # Click on "Create New". | ||
| + | # A wizard will guide you through the setup of a sample design. The steps are explained in more detail below. In short: | ||
| + | ## Select Stand Register: Select what stand register on which to base the sample design. Edit the sample design under "Name of Sample Design" or leave as it is. Click "Next". | ||
| + | ## Create Domains: If you want, you can add domains with "Add Domain" (see below). Click "Next". | ||
| + | ## Create Strata: Click "New" to add a new stratum. | ||
| + | ## To add stands to a stratum, select one or more cells in the matrix, and click "Add Selected". You can hold down the Ctrl-key, and select cells one by one, or press the left mouse button and select blocks of cells. A stratum must first have been created before you can add stands to it. ## After all cells have been assigned a stratum, you will be able to continue by clicking "Next". | ||
| + | ## Sample Size: Select the numner of sample stands, and allocate stands to stratum. You can let the program propose an allocation, and edit this one manually. | ||
| + | ## Sample Plot Intensity: The number of sample plot per sample stands can be a function of selected stand variables. | ||
| + | ## Sample Plot Radius: The plot radius for established forest can be set as a function of selected stand variables. The plot radius for young forests (plant plot, regeneration plot) is set at the bottom of the page (Plant Plot Radius). | ||
| + | ## Sample Trees: P1, P2, and P3 are parameters used for selecting sample trees. See below. | ||
| + | ## Leave "Automatically generate new seed" unchecked, if you want to be able to repeat the procedure and obtain the same sample result. | ||
| + | ## Summary: Display the sample list of stands to inventory. Inspect! | ||
===Stand Data Required=== | ===Stand Data Required=== | ||
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A domain is here a certain type of forest (e.g., stands with the dominating tree species ''Pinus contorta'') where a certain inventory-scheme should be applied, e.g. securing a certain sample size. The classification is done in the same manner as the forest domain-builder in PlanWise, i.e. the user can select stand-wise properties in the register and define (by using the logical operators) the conditions of a certain domain. If the same inventory-scheme should be applied in all stands in the current analysis area, no additional domains needs to be defined. | A domain is here a certain type of forest (e.g., stands with the dominating tree species ''Pinus contorta'') where a certain inventory-scheme should be applied, e.g. securing a certain sample size. The classification is done in the same manner as the forest domain-builder in PlanWise, i.e. the user can select stand-wise properties in the register and define (by using the logical operators) the conditions of a certain domain. If the same inventory-scheme should be applied in all stands in the current analysis area, no additional domains needs to be defined. | ||
| − | === | + | ===Strata === |
The stratification is done in each domain separately. The stands (their productive forest land areas) of a certain domain are related to one of the several user-defined strata. In addition to total area, the number of stands and the area of the largest stand can be viewed in each stratum. The stratum-matrix should first be arranged according to current forest state (by number of classes and class width) and, if desirable, defined by other variables than volume and age. | The stratification is done in each domain separately. The stands (their productive forest land areas) of a certain domain are related to one of the several user-defined strata. In addition to total area, the number of stands and the area of the largest stand can be viewed in each stratum. The stratum-matrix should first be arranged according to current forest state (by number of classes and class width) and, if desirable, defined by other variables than volume and age. | ||
| − | === | + | ===Number of Sample Stands=== |
| − | ''NB: There should be at least three sample stands in each stratum. Moreover, aviod extreme differences in the representative area of different strata.'' | + | ''NB: There should be at least three sample stands in each stratum. Moreover, aviod extreme differences in the representative area of different strata.'' |
===Plot Intensity=== | ===Plot Intensity=== | ||