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ALDER_INDEX_10M
606680.000000
1602800.000000
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Projected
GCS_North_American_1983_HARN
Linear Unit: Foot_US (0.304801)
NAD_1983_HARN_StatePlane_Washington_South_FIPS_4602_Feet
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20230530
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dataset
Allison Bailey
Washington Department of Natural Resources
20230530
Enterprise Geodatabase Raster Dataset
Esri ArcGIS 13.1.0.41833
Red Alder Site Suitability Model for Western Washington (10 meter), v1.1, 2023-06
raster digital data
Florian Deisenhofer
Washington Department of Natural Resources
Silviculturist
Allison Bailey
Washington Department of Natural Resources
Allison Bailey
Alder Index 10m
1
-124.801077
-120.646837
49.033285
45.485318
Red Alder Site Suitability Model for Western Washington (10 meter), v1.1, 2023-06. This site suitability model was developed to assist forest managers in western Washington with their planning and site selection efforts for red alder production. The model was updated in 2023 following the approach developed for the original model implementation in 2010. The updates include (1) incorporation of Washington Department of Natural Resources’ (DNR) most current soils and elevation data, including lidar where available, and (2) expanding the spatial extent beyond DNR’s state lands to all lands in western Washington that are covered by the data sources.
<DIV STYLE="text-align:Left;font-size:12pt"><DIV><DIV><P STYLE="margin:0 0 6 0;"><SPAN>This site suitability model was developed to assist forest managers in western Washington with their planning and site selection efforts for red alder production. The model was updated in 2023 following the approach developed for the original model implementation in 2010. The updates include (1) incorporation of Washington Department of Natural Resources’ (DNR) most current soils and elevation data, including lidar where available, and (2) expanding the spatial extent beyond DNR’s state lands to all lands in western Washington that are covered by the data sources. </SPAN></P><P STYLE="margin:0 0 6 0;"><SPAN>The land base of the Pacific Northwest includes large areas that could support hardwoods or a hardwood component. Often, however, site index, the most commonly used measure of a site's potential productivity, is not available for red alder as other species occupy the site. In order to make site-specific management decisions, the suitability for red alder production can be assessed by geographic and topographic position, soil moisture and aeration during the growing season, and soil fertility and physical condition (Harrington 1986). The difficulty of weighing these physical factors to determine site suitability appears to be a major impediment to the establishment of red alder plantations. Additionally, forest managers are lacking a planning tool that would consider red alder in the landscape for long term management plans. </SPAN></P><P STYLE="margin:0 0 6 0;"><SPAN><SPAN>To assist forest managers in their planning and site selection efforts, we developed a GIS-based Red Alder Site Suitability Model based on physical criteria identified by Harrington (1986) as most influential on the productivity of red alder. The major components of the model are elevation, topographic position, slope, aspect, soil type, and soil depth. The model was implemented in a GIS (ESRI ArcPro v.3.0) raster environment with topographic position, slope, aspect, and elevation derived from a 10-meter digital elevation model (DEM), using lidar data where available. Topographic position class of valley, lower slope, flat slope, middle slope, upper slope, or ridgetop was derived from the topographic position index (TPI) using standard deviation thresholds as described by Weiss (2001). The soil texture and depth were derived from Washington DNR</SPAN></SPAN><SPAN><SPAN>’</SPAN></SPAN><SPAN><SPAN>s corporate soil data layer. Each pixel was then classified and assigned one of four suitability categories: High, Medium, Low, and No Potential. </SPAN></SPAN></P><P STYLE="margin:0 0 6 0;"><SPAN><SPAN>Because of the level of spatial detail of the model, forest managers can assess the potential of red alder management on any given site, such as planned timber harvest. Additionally, the model can be used at a larger scale, i.e. planning for future product diversification in a watershed.</SPAN></SPAN></P><P STYLE="margin:0 0 6 0;"><SPAN><SPAN>The model has been cursorily field-verified on existing red alder plantations and compared with locations and site index of natural red alder stands for DNR's forest inventory system. Initial results indicate that the model is accurate in identifying sites with potential for intensive red alder management. Local knowledge will still be an important factor in the application of the model. Frost pockets or areas susceptible to other physical damage such as ice damage (i.e. within the east wind drafts of the Columbia River Gorge) are not identified in by this model. The usefulness of this model will be determined by the experience of the field staff over time. </SPAN></SPAN></P><P STYLE="margin:0 0 6 0;"><SPAN><SPAN>References:</SPAN></SPAN></P><P STYLE="margin:0 0 6 0;"><SPAN><SPAN>Harrington, Constance A. 1986. A method of site quality evaluation for red alder. Gen. Tech. Rep. PNW-GTR-192. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 22 p. </SPAN></SPAN><A href="https://doi.org/10.2737/PNW-GTR-192" STYLE="text-decoration:underline;"><SPAN><SPAN>https://doi.org/10.2737/PNW-GTR-192</SPAN></SPAN></A></P><P STYLE="margin:0 0 6 0;"><SPAN>Weiss, A. 2001. Topographic position and landforms analysis. In Poster presentation, ESRI user conference, San Diego, CA (Vol. 200). http://www.jennessent.com/downloads/tpi-poster-tnc_18x22.pdf</SPAN></P></DIV></DIV></DIV>
red alder
habitat
site suitability
western Washington
elevation
topographic position
aspect
slope
soil type
soil depth
<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 6 0;"><SPAN>The Washington State Department of Natural Resources (DNR) provides these geographic data and scripts "as is." DNR makes no guarantee or warranty concerning the accuracy of information contained in the geographic data and scripts. DNR further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers of DNR, no warranty, expressed or implied, is made by DNR regarding the use of these data and scripts on any other system, nor does the fact of distribution constitute or imply any such warranty.</SPAN></P></DIV></DIV></DIV>
Allison Bailey
Washington Department of Natural Resources
Allison Bailey
Florian Deisenhofer (Florian.Deisenhofer@dnr.wa.gov) and Allison Bailey (Allison.Bailey@dnr.wa.gov), 2023 model updates. Florian Deisenhofer, Rebecca Niggemann, and Eric Aubert, 2010 Initial model development. Constance Harrington, Emeritus Scientist, US Forest Service, conceptual foundation for the model design.
2
1
0
606680.000000 81850.000000
606680.000000 1349770.000000
1602800.000000 1349770.000000
1602800.000000 81850.000000
1104740.000000 715810.000000
33204
30.000000
42264
30.000000
EPSG
6.3(9.0.0)
Band_1
4428.000000
1.000000
32
False
False
False
False
False
SDE_VAT_1377
Table
4428
Raster attribute table
ESRI
OBJECTID
OBJECTID
OID
4
10
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Value
VALUE
Integer
4
10
0
Raster pixel value. Represents a unique combination of factors (elevation, topographic position, aspect, slope, soil type, and soil depth)
ESRI
Sequential unique whole numbers that are automatically generated.
Count
COUNT
Double
8
38
8
Count of pixel with the corresponding value (or combination of alder suitability factors)
ESRI
positive integer from 1 to number of pixels in the raster
ALDER_INDX
ALDER_INDX
String
20
0
0
Alder potential site suitability index level
DNR
HIGH
high potential suitability
DNR
MEDIUM
medium potential suitability
DNR
LOW
low potential suitability
DNR
NO POTENTIAL
no potential suitability
DNR
ELEV_FT
ELEV_FT
String
20
0
0
Elevation class in feet
DNR
1-1000
elevation between 1 ft and 1000 ft
DNR
1001-2000
elevation between 1001 ft and 2000 ft
DNR
2001-2500
elevation between 2001 ft and 2500 ft
DNR
> 2500
elevation greater than 2500 ft
DNR
POSITION
POSITION
String
20
0
0
Topographic position class derived from Topographic Position Index (TPI)
Weiss 2001
RIDGE TOP
topographic ridge (> TPI mean + 1 std. dev.)
Weiss 2001
UPPER SLOPE
upper slope ( TPI between 0.5 std. dev and 1 std. dev)
Weiss 2001
MIDDLE SLOPE
middle slope (TPI between -0.5 std. dev. and 0.5 std. dev., and slope > 5 degrees)
Weiss 2001
FLAT SLOPE
flat regions (TPI between -0.5 std. dev. and 0.5 std. dev., and slope <= 5 degrees)
Weiss 2001
LOWER SLOPE
lower slope (TPI between -1 std. dev. and -0.5 std. dev.)
Weiss 2001
VALLEY
valley (< TPI mean - 1 std. dev.)
Weiss 2001
ASPECT
ASPECT
String
20
0
0
compass direction that the downhill slope faces
ESRI
NW, N, NE
northwest, north, or northeast facing slope
DNR
E, W
east or west facing slope
DNR
Flat, SW, S, SE
flat area or southwest, south, or southeast facing slope
DNR
SLOPE_PCT
SLOPE_PCT
String
20
0
0
rate of change of elevation for each digital elevation model (DEM) cell in percent.
ESRI
0-5
slope between 0 and 5 percent
DNR
5-20
slope between 5 and 20 percent
DNR
20-30
slope between 20 and 30 percent
DNR
30-35
slope between 30 and 35 percent
DNR
35-45
slope between 35 and 45 percent
DNR
45-50
slope between 45 and 50 percent
DNR
50-60
slope between 50 and 60 percent
DNR
> 60
slope greater than 60 percent
DNR
SOIL_TYPE
SOIL_TYPE
String
20
0
0
The suitability level of soils for alder growth, based on DNR soil types
DNR
HIGH
high suitability soils: loam, silt, silt loam, silt clay loam
DNR
MEDIUM
medium suitability soils: clay loam, cobbly loam, cobbly silt loam, gravelly clay loam, gravelly loam, gravelly silt loam, gravelly silt clay loam, sandy loam, silty clay, variable loam
DNR
LOW
low suitability soils: clay, cobbly fine sandy loam, cobbly sandy loam, coarse sandy loam, fine sandy loam, gravelly coarse sandy loam, gravelly fine sandy loam, gravelly sandy loam, rocky silt loam, sandy clay, stony clay loam, stony loam, stony silt loam, very fine sandy loam
DNR
NO POTENTIAL
soils with no potential suitability: all soils other than those listed for high, medium, or low soil suitability
DNR
SOIL_DEP
SOIL_DEP
String
20
0
0
soil depth category in inches
DNR
< 30
Less than 30 inches depth
DNR
>= 30
Greater than or equal to 30 inches depth
DNR
Pixel
42264
33204
30.000000
30.000000
32
1
Upper Left
FALSE
LZ77
1
pixel codes
SDR
TRUE
row and column
30.000000
30.000000