Preparing spatial analyses - Revision history

Peder at 15:35, 11 September 2014

2014-09-11T15:35:41Z

Hah at 13:52, 15 September 2009

2009-09-15T13:52:08Z

Hah at 13:44, 15 September 2009

2009-09-15T13:44:39Z

Hah at 13:35, 15 September 2009

2009-09-15T13:35:19Z

Hah at 12:52, 15 September 2009

2009-09-15T12:52:30Z

Hah at 12:51, 15 September 2009

2009-09-15T12:51:52Z

Hah at 12:25, 15 September 2009

2009-09-15T12:25:21Z

Hah at 12:24, 15 September 2009

2009-09-15T12:24:29Z

Hah at 11:53, 15 September 2009

2009-09-15T11:53:54Z

Hah at 11:14, 15 September 2009

2009-09-15T11:14:38Z

← Older revision		Revision as of 15:35, 11 September 2014
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	Having performed these calculations, forest data is prepared for spatial analyses in, e.g., the optimizations in PlanWise.		Having performed these calculations, forest data is prepared for spatial analyses in, e.g., the optimizations in PlanWise.
		+
		+	[[Category:User's Guides]]

← Older revision		Revision as of 13:52, 15 September 2009
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	If the prerequisite above is valid, an example can be seen in the figure: ''The clique(s) at the border intersection of stand two, three, four, and five equal the sets {TU2, TU4, TU5} and {TU3, TU4, TU5}, else, i.e. if a point-connection is enough, the set {TU2, TU3, TU4, TU5}.'' Usually, in an analysis area with a "normal" stand delineation, border intersections give rise to cliques including two stands (seen in figure along the edge) or three stands (seen in figure within the area). ''It is possible to delineate stands as "pieces of a cake", implying a fairly circular analysis area, but with point-connections being enough to form a clique then opening size constrains will not be a piece of cake...''		If the prerequisite above is valid, an example can be seen in the figure: ''The clique(s) at the border intersection of stand two, three, four, and five equal the sets {TU2, TU4, TU5} and {TU3, TU4, TU5}, else, i.e. if a point-connection is enough, the set {TU2, TU3, TU4, TU5}.'' Usually, in an analysis area with a "normal" stand delineation, border intersections give rise to cliques including two stands (seen in figure along the edge) or three stands (seen in figure within the area). ''It is possible to delineate stands as "pieces of a cake", implying a fairly circular analysis area, but with point-connections being enough to form a clique then opening size constrains will not be a piece of cake...''
		+
		+	Having performed these calculations, forest data is prepared for spatial analyses in, e.g., the optimizations in PlanWise.

← Older revision		Revision as of 13:44, 15 September 2009
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	#"Common Border Length > 0 m Required" implies that a point-connection is '''not''' enough to include two stands in the same clique.		#"Common Border Length > 0 m Required" implies that a point-connection is '''not''' enough to include two stands in the same clique.

−	If the prerequisite above is valid, an example can be seen in the figure: ''The clique(s) at the border intersection of stand two, three, four, and five equal the sets {TU2, TU4, TU5} and {TU3, TU4, TU5}, else, i.e. if a point-connection is enough, the set {TU2, TU3, TU4, TU5}.'' Usually, in an analysis area with a "normal" stand delineation, border intersections give rise to cliques including two stands (seen in figure along the edge) or three stands (seen in figure within the area).	+	If the prerequisite above is valid, an example can be seen in the figure: ''The clique(s) at the border intersection of stand two, three, four, and five equal the sets {TU2, TU4, TU5} and {TU3, TU4, TU5}, else, i.e. if a point-connection is enough, the set {TU2, TU3, TU4, TU5}.'' Usually, in an analysis area with a "normal" stand delineation, border intersections give rise to cliques including two stands (seen in figure along the edge) or three stands (seen in figure within the area). ''It is possible to delineate stands as "pieces of a cake", implying a fairly circular analysis area, but with point-connections being enough to form a clique then opening size constrains will not be a piece of cake...''

@@ Line 3: / Line 3: @@
 ''NB: "Harvest" is here corresponding to final felling, sometimes also called clearcut. Harvesting is done in thinning but a stand will, after such treatment, not show an open area. A problem occur when seed trees are retained in final fellings. However, the stem density is usually quite low (less than 150 stems per hectare), where quite a few usually will be windthrown in the first couple of years, and hence regarded as an opening.''
 {|
-|[[Image:Landscape8.png|500px|thumb|left|Map of "Landscape8"]]
+|[[Image:Landscape8.png|500px|thumb|left|Map of "Landscape8" (modified)]]
 |}
 *'''Adjacencies'''
@@ Line 27: / Line 27: @@
 #"Common Border Length > 0 m Required" implies that a point-connection is '''not''' enough to include two stands in the same clique.
-If the prerequisite above is valid, an example can be seen in the figure: ''the clique at the border intersection of stand two, three, four, and five equal the sets {TU2, TU4, TU5} and {TU3, TU4, TU5}, else (if a point-connection is enough) the set {TU2, TU3, TU4, TU5}.''
+If the prerequisite above is valid, an example can be seen in the figure: ''The clique(s) at the border intersection of stand two, three, four, and five equal the sets {TU2, TU4, TU5} and {TU3, TU4, TU5}, else, i.e. if a point-connection is enough, the set {TU2, TU3, TU4, TU5}.'' Usually, in an analysis area with a "normal" stand delineation, border intersections give rise to cliques including two stands (seen in figure along the edge) or three stands (seen in figure within the area).

← Older revision		Revision as of 12:52, 15 September 2009
Line 27:		Line 27:
	#"Common Border Length > 0 m Required" implies that a point-connection is '''not''' enough to include two stands in the same clique.		#"Common Border Length > 0 m Required" implies that a point-connection is '''not''' enough to include two stands in the same clique.

−	If the prerequisite above is valid, an example can be seen in the figure: '''the clique at the border intersection of stand two, three, four, and five equal the sets {TU2, TU4, TU5} and {TU3, TU4, TU5}, else (if a point-connection is enough) the set {TU2, TU3, TU4, TU5}.''	+	If the prerequisite above is valid, an example can be seen in the figure: ''the clique at the border intersection of stand two, three, four, and five equal the sets {TU2, TU4, TU5} and {TU3, TU4, TU5}, else (if a point-connection is enough) the set {TU2, TU3, TU4, TU5}.''

← Older revision		Revision as of 12:51, 15 September 2009
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	#"Common Border Length > 0 m Required" implies that a point-connection is '''not''' enough to include two stands in the same clique.		#"Common Border Length > 0 m Required" implies that a point-connection is '''not''' enough to include two stands in the same clique.
		+
		+	If the prerequisite above is valid, an example can be seen in the figure: '''the clique at the border intersection of stand two, three, four, and five equal the sets {TU2, TU4, TU5} and {TU3, TU4, TU5}, else (if a point-connection is enough) the set {TU2, TU3, TU4, TU5}.''

@@ Line 23: / Line 23: @@
 Settings are done partly to limit the amount of data and computational time. By defining a certain "Max Cluster Area", the user can '''not''' in later parts restrict any opening sizes above this maximum value. However, it is possible to include restrictions upon opening sizes of lesser size. From this follows that a certain cluster can include two or more other clusters, e.g. the set ''{TU6, TU7, TU8}'' at the same time defines the sets ''{TU6, TU7}'', ''{TU6, TU8}'', and ''{TU7, TU8}'', in addition to the clusters of the single stands. A consequence in an optimization model with a certain opening size constrain is that if a cluster can be harvested in a certain period, so can all including clusters be.
-Then to the cliques. As said, these consist of sets of stands, describing the connection between clusters. The user here defines:
+Then to the cliques. As said, these consist of sets of stands (or polygons), describing the connection between clusters. The user here defines:
 #"Common Border Length > 0 m Required" implies that a point-connection is '''not''' enough to include two stands in the same clique.

← Older revision		Revision as of 12:24, 15 September 2009
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	Settings are done partly to limit the amount of data and computational time. By defining a certain "Max Cluster Area", the user can '''not''' in later parts restrict any opening sizes above this maximum value. However, it is possible to include restrictions upon opening sizes of lesser size. From this follows that a certain cluster can include two or more other clusters, e.g. the set ''{TU6, TU7, TU8}'' at the same time defines the sets ''{TU6, TU7}'', ''{TU6, TU8}'', and ''{TU7, TU8}'', in addition to the clusters of the single stands. A consequence in an optimization model with a certain opening size constrain is that if a cluster can be harvested in a certain period, so can all including clusters be.		Settings are done partly to limit the amount of data and computational time. By defining a certain "Max Cluster Area", the user can '''not''' in later parts restrict any opening sizes above this maximum value. However, it is possible to include restrictions upon opening sizes of lesser size. From this follows that a certain cluster can include two or more other clusters, e.g. the set ''{TU6, TU7, TU8}'' at the same time defines the sets ''{TU6, TU7}'', ''{TU6, TU8}'', and ''{TU7, TU8}'', in addition to the clusters of the single stands. A consequence in an optimization model with a certain opening size constrain is that if a cluster can be harvested in a certain period, so can all including clusters be.

−	Then to the cliques	+	Then to the cliques. As said, these consist of sets of stands, describing the connection between clusters. The user here defines:
		+
		+	#"Common Border Length > 0 m Required" implies that a point-connection is '''not''' enough to include two stands in the same clique.

@@ Line 15: / Line 15: @@
 In "Tools" > "Compute Cliques and Harvest Clusters" the analysis area is first selected. Adjacencies needs to be calculated prior to this computation. These two parameters might be somewhat tricky to comprehend but necessary in optimizations with opening size constrains. Both cliques and clusters are sets of neighbouring stands, where the sets are defined by the user.
-Starting with the harvest clusters (that, by the way, always starts with defining a cluster of each single stand or, more correctly, polygon):
+Starting with the harvest clusters (that, by the way, always starts with defining a cluster of each single stand or, more correctly, of each single polygon):
 #"Min Border Length" defines the minimum length of a common border (in meters) if the both of two adjacent stands can be included in the same cluster.
@@ Line 21: / Line 21: @@
 #"Max Cluster Area" defines the maximum size (in hectares) of a cluster.
-Settings are done partly to limit the amount of data and computational time. By defining a certain "Max Cluster Area", the user can in later parts '''not''' restrict any opening sizes above this maximum value. However, it is possible to include restrictions upon opening sizes of lesser size. From this follows that a certain cluster can include two or more other clusters, e.g. the set ''{TU6, TU7, TU8}'' at the same time defines the sets ''{TU6, TU7}'', ''{TU6, TU8}'', and ''{TU7, TU8}'', in addition to the clusters of the single stands.
+Settings are done partly to limit the amount of data and computational time. By defining a certain "Max Cluster Area", the user can '''not''' in later parts restrict any opening sizes above this maximum value. However, it is possible to include restrictions upon opening sizes of lesser size. From this follows that a certain cluster can include two or more other clusters, e.g. the set ''{TU6, TU7, TU8}'' at the same time defines the sets ''{TU6, TU7}'', ''{TU6, TU8}'', and ''{TU7, TU8}'', in addition to the clusters of the single stands. A consequence in an optimization model with a certain opening size constrain is that if a cluster can be harvested in a certain period, so can all including clusters be.

← Older revision		Revision as of 11:14, 15 September 2009
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	#"Max Cluster Area" defines the maximum size (in hectares) of a cluster.		#"Max Cluster Area" defines the maximum size (in hectares) of a cluster.

−	Settings are done partly to limit the amount of data and computational time. By defining a certain "Max Cluster Area", the user can in later ~~part~~ not restrict any opening sizes above this maximum value. However, it is possible to include restrictions upon opening sizes of lesser size. From this follows that a certain cluster can include two or more other clusters, e.g. the set ''{TU6, TU7, TU8}'' at the same time defines the sets ''{TU6, TU7}'', ''{TU6, TU8}'', and ''{TU7, TU8}'', in addition to the single stands.	+	Settings are done partly to limit the amount of data and computational time. By defining a certain "Max Cluster Area", the user can in later parts '''not''' restrict any opening sizes above this maximum value. However, it is possible to include restrictions upon opening sizes of lesser size. From this follows that a certain cluster can include two or more other clusters, e.g. the set ''{TU6, TU7, TU8}'' at the same time defines the sets ''{TU6, TU7}'', ''{TU6, TU8}'', and ''{TU7, TU8}'', in addition to the clusters of the single stands.