Gradient Nearest Neighbor (GNN) Vegetation Classes - 1996

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Description of 34 class vegetation types

Keith Olsen - email: Keith.Olsen@oregonstate.edu
19 April 2005

For more information on the GNN method, please visit:

http://www.fsl.orst.edu/lemma/method/

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0-1 Not Simulated (nonforest)

Canopy Cover < 40.0%

6 W/o remnants (TPH50 < 0.5)
7 Low remnants (TPH50 >= 0.5 and < 5.5)
8 Moderate remnants (TPH50 >= 5.5 and < 12.0)
9 High remnants (TPH50 >= 12.0)

Canopy Cover >= 40.0%

Hardwoods (Hardwood basal area proportion >= 0.65)
Small (QMDALL < 25.0)

10 W/o remnants (TPH50 < 0.5)
11 Low remnants (TPH50 >= 0.5 and < 5.5)
12 Moderate remnants (TPH50 >= 5.5 and < 12.0)
13 High remnants (TPH50 >= 12.0)

Medium (QMDALL >= 25.0 and < 50.0)

14 W/o remnants (TPH75 < 0.5)
15 Low remnants (TPH75 >= 0.5 and < 5.5)
16 Moderate remnants (TPH75 >= 5.5 and < 12.0)
17 High remnants (TPH75 >= 12.0)

18 Large (QMDALL >= 50.0 and < 75.0)
19 Very large (QMDALL >= 75.0)

Mixed (Hardwood basal area proportion >= 0.2 and < 0.65)
Small (QMDCDOM3 < 25.0)

20 W/o remnants (TPH50 < 0.5)
21 Low remnants (TPH50 >= 0.5 and < 5.5)
22 Moderate remnants (TPH50 >= 5.5 and < 12.0)
23 High remnants (TPH50 >= 12.0)

Medium (QMDCDOM3 >= 25.0 and < 50.0)

24 W/o remnants (TPH75 < 0.5)
25 Low remnants (TPH75 >= 0.5 and < 5.5)
26 Moderate remnants (TPH75 >= 5.5 and < 12.0)
27 High remnants (TPH75 >= 12.0)

28 Large (QMDCDOM3 >= 50.0 and < 75.0)
29 Very large (QMDCDOM3 >= 75.0)

Conifer (Hardwood basal area proportion < 0.2)
Small (QMDCDOM3 < 25.0)

30 W/o remnants (TPH50 < 0.5)
31 Low remnants (TPH50 >= 0.5 and < 5.5)
32 Moderate remnants (TPH50 >= 5.5 and < 12.0)
33 High remnants (TPH50 >= 12.0)

Medium (QMDCDOM3 >= 25.0 and < 50.0)

34 W/o remnants (TPH75 < 0.5)
35 Low remnants (TPH75 >= 0.5 and < 5.5)
36 Moderate remnants (TPH75 >= 5.5 and < 12.0)
37 High remnants (TPH75 >= 12.0)

38 Large (QMDCDOM3 >= 50.0 and < 75.0)
39 Very large (QMDCDOM3 >= 75.0)

Where QMDALL - QMD of all trees
QMDCDOM3 - QMD of dominant conifer. See Ohmann UDB metadata.
TPH50 - Trees per hectare > 50 cm dbh
TPH75 - Trees per hectare > 75 cm dbh

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Remap table for 8 Classes
1 1 : 1
6 6 : 2
7 9 : 3
10 19 : 4
20 23 : 5
24 27 : 6
28 28 : 7
29 29 : 8
30 33 : 5
34 37 : 6
38 38 : 7
39 39 : 8

Remap table for 12 Classes
1 1 : 1
6 6 : 2
7 9 : 3
10 19 : 4
20 23 : 5
24 27 : 6
28 28 : 7
29 29 : 8
30 33 : 9
34 37 : 10
38 38 : 11
39 39 : 12