Template:Directional Roughness

Directional Roughness

The Landuse Raster to Directional Roughness tool converts a landuse raster (NLCD, C-CAP, etc.) to a coastal directional roughness dataset. The tool has the following options:

• Input landuse raster – Select which landuse raster in the project will be the input.
• Method – Select which method will be used for computation of the conversion.
  • "Linear" – Computations will convert in a linear fashion.
  • "Sector" – Computations will convert through the use of sectors.
• Total distance – Sets the total distance of the directional roughness, measured in the units that the project is set in.
• Weighted distance – Sets the weighted distance of the directional roughness, measured in the units that the project is set in.
• Target grid – Select which grid will be the target.
• Landuse raster type – Select which type the landuse raster is.
  • "NLCD" – Sets the landuse raster type to National Land Cover Dataset (NLCD). A mapping table file for NLCD can be found here and down below.
  • "C-CAP" – Sets the landuse raster type to Coastal Change Analysis Program (C-CAP). A mapping table file for C-CAP can be found here and down below.
  • "Other" – Sets the landuse raster type to be set by the user. This selection adds an option to the dialog.
    • Landuse to directional roughness mapping table – The Select File... button allows a table file to be selected. Its full file name will appear on the box to its right.
• Default wind reduction value – Set the default level of wind reduction for the new dataset.
• Output wind reduction dataset – Enter the name for the new wind reduction dataset

Directional Roughness NLCD Mapping Table

Directional Roughness NLCD Values

Code	Description	Roughness
0	Background	0
1	Unclassified	0
11	Open Water	0.001
12	Perennial Ice/Snow	0.012
21	Developed Open Space	0.1
22	Developed Low Intensity	0.3
23	Developed Medium Intensity	0.4
24	Developed High Intensity	0.55
31	Barren Land (Rock/Sand/Clay)	0.04
41	Deciduous Forest	0.65
42	Evergreen Forest	0.72
43	Mixed Forest	0.71
51	Dwarf Scrub	0.1
52	Shrub/Scrub	0.12
71	Grassland/Herbaceous	0.04
72	Sedge/Herbaceous	0.03
73	Lichens	0.025
74	Moss	0.02
81	Pasture/Hay	0.06
82	Cultivated Crops	0.06
90	Woody Wetlands	0.55
95	Emergent Herbaceous Wetlands	0.11
91	Palustrine Forested Wetland	0.55
92	Palustrine Scrub/Shrub Wetland	0.12
93	Estuarine Forested Wetland	0.55
94	Estuarine Scrub/Shrub Wetland	0.12
96	Palustrine Emergent Wetland (Persistent)	0.11
97	Estuarine Emergent Wetland	0.11
98	Palustrine Aquatic Bed	0.03
99	Estuarine Aquatic Bed	0.03

Chezy Friction CCAP Mapping Table

Chezy Friction CCAP Values

Code	Description	Friction
0	Background	60
1	Unclassified	60
2	Developed High Intensity	15
3	Developed Medium Intensity	22
4	Developed Low Intensity	44
5	Developed Open Space	110
6	Cultivated Crops	59
7	Pasture/Hay	66
8	Grassland/Herbaceous	64
9	Deciduous Forest	22
10	Evergreen Forest	20
11	Mixed Forest	22
12	Scrub/Shrub	44
13	Palustrine Forested Wetland	22
14	Palustrine Scrub/Shrub Wetland	45
15	Palustrine Emergent Wetland (Persistent)	48
16	Estuarine Forested Wetland	22
17	Estuarine Scrub/Shrub Wetland	45
18	Estuarine Emergent Wetland	48
19	Unconsolidated Shore	60
20	Barren Land	24
21	Open Water	110
22	Palustrine Aquatic Bed	150
23	Estuarine Aquatic Bed	150
24	Perennial Ice/Snow	220
25	Tundra	60