Modeling Regions
Modeling Region
8 : Willamette Valley
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OverviewRolling prairies, deciduous/coniferous forests, and extensive wetlands characterized the pre-19th century landscape of this broad, lowland valley. The Willamette Valley is distinguished from the adjacent Coast Range and Cascades by lower precipitation, less relief, and a different mosaic of vegetation. Landforms consist of terraces and floodplains that are interlaced and surrounded by rolling hills. Productive soils and a temperate climate make it one of the most important agricultural areas in Oregon.
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Map Products
| GNN species-size map and accuracy assessment report | FINAL | 2000 | 02/08/2008 |  (31.3 MB) |
| GNN species map and accuracy assessment report | FINAL | N/A | 02/23/2011 | (103.8 MB) |
Plot Database
LEMMA offers a number of data tables associated with
this region. Many of the tables can be downloaded by clicking
on the plot database link below, but the larger tables are
only available upon request. The database contains plot data
for all modeling regions within a project. Documentation for these
tables is embedded in the Data Dictionary section below.
| Ecological systems code descriptions (for nonforest areas) | FINAL | N/A | 11/20/2009 | (9 KB) |
| Plot database (MS Access format) and associated documentation | FINAL | N/A | 05/05/2010 | (25.7 MB) |
Data Dictionary
| dbo | TREE_BA_CROSSTAB | Plot by tree species basal area cross-tabulation table | Included in plot database download |
| dbo | TREE_COV_CROSSTAB | Plot by tree species percent cover cross-tabulation table | Included in plot database download |
| dist | SPPSZ_ATTR_IMAP | Plot information and stand level summary variables attached to GNN grids by default for the IMAP project | Included in plot database download |
| dist | SPPSZ_ATTR_ALL | Plot information and all stand level summary variables (for attaching to GNN grids) | Included in plot database download |
| dbo | TREE_LIVE | Live tree piece-level data | Contact us |
| dbo | TREE_SNAG | Standing dead (snag) piece-level data | Contact us |
| dbo | TREE_CWD | Coarse woody debris piece-level data | Contact us |
| dbo | UNDERSTORY | Understory (non-tree) tally data (cover by species on plots) | Contact us |
| dbo | SPECIES_CLASS | Species classification (family, genus, species, etc.) | Included in plot database download |
Associated Projects
This table lists projects whose study areas partially overlap the region
of interest. Click on the link to be taken to the associated project
pages.
