Forest stand characteristics (for example, growth and yield) describe the current status and development profile of each individual polygon in the management unit. It is important to understand that the time dynamic nature of the Patchworks model is based on the stand dynamics of individual attributes. Let's illustrate this with a look at the Table Viewer and a few specific stand attributes.
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There are several ways to access the stand attribute information in the Table Viewer from the graphical user interface. Here are three methods:
The Table Viewer functions similarly to many database applications. You may scroll through records vertically and horizontally, select records and query for specific information. Each row in the table represents a polygon in the dataset. The columns represent the attributes that describe the characteristics of each block. |
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Notice the same time scale bar along the far right of the table. Each of the cells represent the value of the attribute at the time period indicated by the slider bar (period 0 represents the initial conditions in the original dataset). Some attributes are static and do not change over time, such as the area of the polygon, however other dynamic attributes (e.g. standing volume) will change through time. For more information about attributes see the section called “The Block Attribute Table” or the section called “The Block Attribute Table” |
There are thousands of records in the dataset, each representing a polygon. To find a particular polygon that will illustrate our example we can use the Query Tool. The Query Tool lets you select records using a logical query expression.
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Figure 6. The Query tool dialog
The query tool selects a subset of records using a logical query expression.
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Although the record has been selected, locating it within the thousands of others is like finding a needle in a haystack. We can find our selected records quickly by promoting them to the top of the list.
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You may have to widen the column headings to see the entire attribute name. This is accomplished by pressing the mouse over the column heading divider and moving to the right while holding the mouse button. |
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Figure 7. Viewing block attributes in the Table Viewer.
Information for the selected records is displayed in the block attribute table.
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Another attribute of interest to us is the
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Figure 8. Zoom to selected features.
Zooming to selected features centres the map on the polygon of interest.