Key to BIOME data values
(Prentice et al., 2000 http://pmip2.lsce.ipsl.fr/synth/vegmaps.shtml)

0	sea
1	tropical evergreen forest
2	tropical semi-deciduous forest
3	tropical deciduous forest/woodland
4	temperate deciduous forest
5	temperate conifer forest
6	warm-temperate mixed forest
7	cool mixed forest
8	cool conifer forest
9	cold mixed forest
10	evergreen taiga/montane forest
11	deciduous taiga/montane forest
12	tropical savanna
13	tropical xerophytic shrubland
14	temperate xerophytic shrubland
15	temperate sclerophyll woodland
16	temperate broadleaved savanna
17	open conifer woodland
18	boreal parkland
19	tropical grassland
20	temperate grassland
21	desert
22	steppe tundra
23	shrub tundra
24	dwarf-shrub tundra
25	prostrate shrub tundra
26	cushion-forb, lichen, moss tundra

28	land ice

Key to MEGABIOME data values 
(after Harrison &  Prentice 2003, http://pmip2.lsce.ipsl.fr/synth/mbmaps.shtml)

0	sea
1	tropical forest
2	warm-temperate forest
3	savanna and dry woodland
4	grassland and dry shrubland
5	desert
6	temperate forest
7	boreal forest
8	tundra
9	dry tundra

28	land ice

Key to PRISM2 Vegetation data values
(from Dowsett etal., Middle Pliocene Paleoenvironmental Reconstruction:  PRISM2.
http://pubs.usgs.gov/of/1999/of99-535/)

0	water 
1	desert  
2	tundra 
3	grassland 
6	deciduous forest 
7	coniferous forest 
8	rainforest 
9	land ice