Sample design - Revision history

Peder at 07:33, 10 January 2013

2013-01-10T07:33:30Z

← Older revision		Revision as of 08:33, 10 January 2013
Line 1:		Line 1:
	[[Category:~~PlanStart~~]]		[[Category:PlanWise]]
			[[Category:StandWise]]
			[[Category:RegWise]]

	[[:User's guide to ~~PlanStart~~]]		[[:User's guide to PlanWise]]

	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.

	===Instruction===		===Instruction===
	# In ~~PlanStart~~, open an existing project or create a new one.		# In PlanWise, open an existing project or create a new one.
	# From the top menu "~~Inventory~~", select "Sample Design".		# From the top menu "Data Management" (Datahantering), select "Sample Design" (Stickprovsdesign).
	# Click on "Create New".		# 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:		# A wizard will guide you through the setup of a sample design. The steps are explained in more detail below. In short:

Peder at 13:16, 12 February 2010

2010-02-12T13:16:40Z

← Older revision		Revision as of 14:16, 12 February 2010
Line 1:		Line 1:
	[[Category:PlanStart]]		[[Category:PlanStart]]

			[[:User's guide to PlanStart]]

	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.

Peder at 15:39, 29 December 2009

2009-12-29T15:39:48Z

← Older revision		Revision as of 16:39, 29 December 2009
Line 1:		Line 1:
			[[Category:PlanStart]]

	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.

Peder: /* Instruction */

2009-12-22T13:10:31Z

Instruction

← Older revision		Revision as of 14:10, 22 December 2009
Line 9:		Line 9:
	## Create Domains: If you want, you can add domains with "Add Domain" (see below). 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.		## 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 must create the strata to which you want to add stands first~~. You can hold down the Ctrl-key, and select cells one by one, or press the left mouse button and select blocks of cells.		## 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".
	## 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 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 Intensity: The number of sample plot per sample stands can be a function of selected stand variables.

Peder: /* Instruction */

2009-12-22T13:08:49Z

Instruction

← Older revision		Revision as of 14:08, 22 December 2009
Line 9:		Line 9:
	## Create Domains: If you want, you can add domains with "Add Domain" (see below). 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.		## 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 must create the strata to which you want to add stands first. You can hold down the Ctrl-key, and select cells one by one, or press the left mouse button and		## To add stands to a stratum: Select one or more cells in the matrix, and click "Add Selected". You must create the strata to which you want to add stands first. You can hold down the Ctrl-key, and select cells one by one, or press the left mouse button and select blocks of cells.
	select blocks of cells.
	## After all cells have been assigned a stratum, you will be able to continue by clicking "Next".		## 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 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.

Peder: /* Instruction */

2009-12-22T13:08:07Z

Instruction

← Older revision		Revision as of 14:08, 22 December 2009
Line 10:		Line 10:
	## Create Strata: Click "New" to add a new stratum.		## 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 must create the strata to which you want to add stands first. You can hold down the Ctrl-key, and select cells one by one, or press the left mouse button and		## To add stands to a stratum: Select one or more cells in the matrix, and click "Add Selected". You must create the strata to which you want to add stands first. You can hold down the Ctrl-key, and select cells one by one, or press the left mouse button and
	select blocks of cells. ## After all cells have been assigned a stratum, you will be able to continue by clicking "Next".		select blocks of cells.
			## 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 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 Intensity: The number of sample plot per sample stands can be a function of selected stand variables.

Peder: /* Instruction */

2009-12-22T13:07:41Z

Instruction

← Older revision		Revision as of 14:07, 22 December 2009
Line 10:		Line 10:
	## Create Strata: Click "New" to add a new stratum.		## 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 must create the strata to which you want to add stands first. You can hold down the Ctrl-key, and select cells one by one, or press the left mouse button and		## To add stands to a stratum: Select one or more cells in the matrix, and click "Add Selected". You must create the strata to which you want to add stands first. You can hold down the Ctrl-key, and select cells one by one, or press the left mouse button and
	select blocks of cells.		select blocks of cells. ## After all cells have been assigned a stratum, you will be able to continue by clicking "Next".
	## 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 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 Intensity: The number of sample plot per sample stands can be a function of selected stand variables.

Peder: /* Instruction */

2009-12-22T13:07:10Z

Instruction

← Older revision		Revision as of 14:07, 22 December 2009
Line 6:		Line 6:
	# Click on "Create New".		# 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:		# 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 ~~Desing~~" or leave as is. Click "Next".		## 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 Domains: If you want, you can add domains with "Add Domain" (see below). Click "Next".
	## Create Strata: Click "New" to add a new stratum.		## Create Strata: Click "New" to add a new stratum.
Line 18:		Line 18:
	## Leave "Automatically generate new seed" unchecked, if you want to be able to repeat the procedure and obtain the same sample result.		## 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!		## Summary: Display the sample list of stands to inventory. Inspect!



	===Stand Data Required===		===Stand Data Required===

Peder at 12:55, 22 December 2009

2009-12-22T12:55:17Z

← Older revision		Revision as of 13:55, 22 December 2009
Line 1:		Line 1:
	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.

			===Instruction===
			# In PlanStart, open an existing project or create a new one.
			# From the top menu "Inventory", select "Sample Design".
			# 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 Desing" or leave as 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 must create the strata to which you want to add stands first. You can hold down the Ctrl-key, and select cells one by one, or press the left mouse button and
			select blocks of cells.
			## 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===

Peder: /* When a satisfying stratification of the domain(s) has been obtained, the total number of sample stands are decided */

2009-12-22T12:28:25Z

When a satisfying stratification of the domain(s) has been obtained, the total number of sample stands are decided

← Older revision		Revision as of 13:28, 22 December 2009
Line 16:		Line 16:
	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.

	===~~When a satisfying stratification~~ of ~~the domain(s) has been obtained, the total number of sample stands are decided~~===		===Number of Sample Stands===
	This is called the sample size-definition part. First, a defined number of sample stands will be allocated to each stratum (e.g., proportional to the volume). You could and probably should re-distribute the sample stands over the different strata, with a higher sampling intensity in strata with more valuable forests and where forest management decisions are supposed to be more difficult. The term and parameter "Representative Area", with a value calculated as ''Productive forest land area in current stratum / Sample size (number of sampled stands) in current stratum'', might be found a bit confusing. ''A scale factor with a unit (hectares)? With the same value for all sampled stands in a stratum (despite they probably will have different areas)?'' Don't worry, as long as the sampling of stands is done PPS, and size is the productive area (in hectares), it will all turn out alright. Try to follow this: an estimation of, e.g., the total biomass (in m<sup>3</sup>) in a stratum is derived using a Horvitz-Thompson (HT) estimator with inclusion probabilities (''�?''<sub>''i''</sub>) defined as ''(Area of the i:th sample stand * Number of sample stands in current stratum) / Area of current stratum''. By dividing this estimation by the total area of the stratum an average value (here in m<sup>3</sup>/ha) is derived. Finally, the total volume of biomass in current stratum that is represented by the sample is derived by multiplying the average value-estimate by ''Representative area''. The only time this procedure is not followed is when a single stand show an area equal to or greater than the representative area - such stand will become a sample stand and represent its own area (nothing more, nothing less).		This is called the sample size-definition part. First, a defined number of sample stands will be allocated to each stratum (e.g., proportional to the volume). You could and probably should re-distribute the sample stands over the different strata, with a higher sampling intensity in strata with more valuable forests and where forest management decisions are supposed to be more difficult. The term and parameter "Representative Area", with a value calculated as ''Productive forest land area in current stratum / Sample size (number of sampled stands) in current stratum'', might be found a bit confusing. ''A scale factor with a unit (hectares)? With the same value for all sampled stands in a stratum (despite they probably will have different areas)?'' Don't worry, as long as the sampling of stands is done PPS, and size is the productive area (in hectares), it will all turn out alright. Try to follow this: an estimation of, e.g., the total biomass (in m<sup>3</sup>) in a stratum is derived using a Horvitz-Thompson (HT) estimator with inclusion probabilities (''�?''<sub>''i''</sub>) defined as ''(Area of the i:th sample stand * Number of sample stands in current stratum) / Area of current stratum''. By dividing this estimation by the total area of the stratum an average value (here in m<sup>3</sup>/ha) is derived. Finally, the total volume of biomass in current stratum that is represented by the sample is derived by multiplying the average value-estimate by ''Representative area''. The only time this procedure is not followed is when a single stand show an area equal to or greater than the representative area - such stand will become a sample stand and represent its own area (nothing more, nothing less).

	''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===