Sample features file records

Unmanaged features in block 27 follow Track.22

	  TRACK   LABEL                           CURVE
	  22      feature.Area.unmanaged.Dec      44
	  22      feature.Seral.mature            56
	  22      feature.Seral.old               57
	  22      feature.Seral.regen             58
	  22      feature.Seral.young             59
	  22      feature.Visual.disturb          60
	  22      feature.Yield.unmanaged.Conif   61
	  22      feature.Yield.unmanaged.Decid   62

Track.22 contains all the feature curves associated with the unmanaged portion of block 27. It is possible that more than one block is referencing Track.22.

The value of the LABEL field provides the name for the feature attribute. The value of the CURVE field provides a link to the curve structure that describes the time-series numerical relationship for this attribute. Attributes from different tracks may reference the same or different curves (as appropriate) to describe forest development.

Figure 178.  Feature attribute curves for Track.22 (unmanaged portion of block 27)

(a) feature.Seral.old

(b) feature.Yield.unmanaged.Conif

Let us examine and compare several feature attribute curves from the managed and unmanaged portions of block 27. Curve 57 and curve 61 represent old seral stage development and conifer growing stock respectively, on the unmanged portion of the block. The values in these curves are in per unit area units, and must be multiplied by the block areas to yield the correct totals. Curve 57 shows that the old seral stage is present in this stand type from ages 130 to 190. The forest type undergoes a stand-replacing successional event at age 190, and reverts to a younger seral stage condition (not shown in this attribute). If the stand is left untreated the old seral stage condition will show up again at age 315. The growing stock curve (see Figure 178, “ Feature attribute curves for Track.22 (unmanaged portion of block 27) ” shows a similar pattern of growth, decline, breakup and renewal.


The record listing below shows that managed features in block 27 follow Track.23

	TRACK     LABEL                         CURVE
	23        feature.Area.managed.SW       44
	23        feature.Seral.mature          148
	23        feature.Seral.old             149
	23        feature.Seral.regen           150
	23        feature.Seral.young           151
	23        feature.Visual.disturb        150
	23        feature.Yield.managed.Conif   152
	23        feature.Yield.managed.Decid   153

Track.23 contains all the feature curves associated with the managed portion of block 27. Notice that Track.23 also has the attribute value feature.Seral.old but is described by attribute curve 149.

The feature file tells us that the managed area of block 27 is classified as SW forest stratum, and the volume has been divided into Conif and Decid. The rest of features describe seral stage classification and stand disturbance.

Attributes are derived for these features by looking up the unique curve that describes the feature for a particular track and multiplying it by the area described by that track (for the time period in question).

Figure 179.  Feature attribute curves for Track.23 (unmanaged portion of block 27)

(a) feature.Seral.old

(a) feature.Yield.managed.Conif

Curve 149 and 152 represent the old seral stage development and conifer growing stock, respectively, on the managed portion of the block. We can note that these curves have a much longer time until breakup and renewal (over 400 years), and a much longer time period when the stand has an old seral stage classification.

To estimate the total conifer growing stock in the block, or the total area in the old seral stage condition, we would have to multiply the managed and unmanged area by the value of each respective attribute, and sum the results. These calculations are preformed automatically by Patchworks for every attribute of every block, and across all planning periods.

	CURVE   X       Y
	149     0.0     0.0
	149     180.0   0.0
	149     185.0   1.0
	149     424.0   1.0
	149     425.0   0.0
	149     600.0   0.0
	149     605.0   1.0

Viewing growth and yield information pertaining to a single block can be accomplished in Patchworks, instead of hunting through the original core files. The growth and yield line chart above includes all the feature curves related to block 27, for both managed (GREEN) and unmanaged (RED) areas.

Patchworks provides a tool (see the section called “Detailed Inspectors for Block Data”) to examine and visualize growth and yield information that is much more convenient than hunting through the original data files.

A well formatted HTML table of all feature curve and stand information is also available from within the Map Viewer. Use this link to access the HTML Growth and Yield Report for our example block 27: Growth and Yield Information for block 27