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Procedural Summaries

ArcView GIS Procedural Summary

Summary of procedures used to build maps in ArcView GIS.

Step

Procedure

1

Obtain forest cover and TRIM data.

2

Edit database.

3

Create grid coverage (100 x 100 m cells) for forest cover variables.

4

Build 3D model based on TRIM 20 m contours for the whole study area including the areas represented by the adjacent maps.

5

Convert DEM coverage to grid cover using the 100 m cell size.

6

Select the area (map sheet).

7

Calculate Topex2000 score for each grid cell for selected distance = 2000 m for eight cardinal directions (see description below).

8

Use Map Calculator to input the regression equations. The outputs are probability grid covers with different value range for each map sheet. To unify the value range and intervals, set the lower boundary to 0.00, the upper boundary to 0.90, and the number of classes to 6.The management variables in the regression equations are held constant to represent south facing cutblock boundary segments located on the north side of large openings which have had eight years of exposure following harvesting.

9

Risk estimates are unreliable for stands less than 10 m tall, so stands in Height Class 1 are masked by overlay in grey colour.

10

Areas with no-data are shown in white.

11

Areas labelled as non-forest or NSR types are beige and brown.

12

Create the windthrow risk overlays: grid covers overlaid with polygons representing recently logged sites, non-forest, and no data.

 
Forest Service BC
 
Forest Renewal BC