Difference between revisions of "STATSGO2-soil data"
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===2) Soil Qualities and Features: Depth to Any Restrictive Layer=== | ===2) Soil Qualities and Features: Depth to Any Restrictive Layer=== | ||
| − | a) Generate Depth DCD, DCP, WA, ACP using both < and > for tie break rule with no cutoff (8 scenarios | + | a) Generate Depth DCD, DCP, WA, ACP using both < and > for tie break rule with no cutoff (8 scenarios) |
b) Compare these to summer Landsat imagery and use expert judgment to determine the most accurate layer | b) Compare these to summer Landsat imagery and use expert judgment to determine the most accurate layer | ||
Revision as of 21:41, 3 February 2010
Contents
- 1 Step 1: Get soil data
- 2 Step 2: Install Soil Data Viewer
- 3 Step 3: Prepare Access database
- 4 Step 4: Working with Soil Data Viewer in ArcGIS
- 5 Step 5: Karl's method for estimating soil properties using SDV
- 5.1 1) Soil Physical Properties: Surface Texture
- 5.2 2) Soil Qualities and Features: Depth to Any Restrictive Layer
- 5.3 3) Soil Physical Properties: Saturated Hydraulic Conductivity (RHESSys requires Ksat at surface)
- 5.4 4) Soil Physical Properties: Percent Clay (used in RHESSys only for carbon cycling)
- 5.5 5) Soil Physical Properties: Percent Sand (used in RHESSys only for carbon cycling)
- 5.6 6) Soil Physical Properties: Percent Silt (used in RHESSys only for carbon cycling)
Step 1: Get soil data
Download state data from here: [1]
Download county or survey level data from here: [2]
Both sources should include a) tabular data b) spatial data c) Microsoft Access template
State data is spatially coarser than county or survey level data
Step 2: Install Soil Data Viewer
You need 1) Install ArcGIS 9.2 or later for soil data viewer 5.2 on a Windows XP system 2) Install soil data viewer version 5.2 [3]
Step 3: Prepare Access database
1) Open Access template 2) Enable macros 3) Type in full path name to tabular data 4) Import should run automatically
Step 4: Working with Soil Data Viewer in ArcGIS
1) Open ArcGIS - View > Toolbars > Soil Data Viewer Tools 2) Click on the Soil Data Viewer button 3) Browse to Access database 4) Choose the soil data layer to connect to the database
Soil data viewer online user guide is here: [4]
Step 5: Karl's method for estimating soil properties using SDV
Definitions:
a) Dominant Condition (DCD)
b) Dominant Component (DCP)
c) Weighted Average (WA)
d) All Layers (ACP)
1) Soil Physical Properties: Surface Texture
Useful for a) naming the soil .def file b) understanding depth to soil restrictive layer c) understanding ksat at surface
2) Soil Qualities and Features: Depth to Any Restrictive Layer
a) Generate Depth DCD, DCP, WA, ACP using both < and > for tie break rule with no cutoff (8 scenarios)
b) Compare these to summer Landsat imagery and use expert judgment to determine the most accurate layer
c) Depth To Any Restrictive Layer results for Silver Fork
- ACP, > 127,143,153 - not much spatial variability;
- ACP, < 0 - basically junk;
- WA - tie break doesn't matter, 17 for texture un-weathered bedrock;
- DCP - tie break doesn't matter, very shallow in upper basin;
- DCD, > zeros where surface texture is bedrock, 77,127,201
- DCD, < zeros where surface texture is bedrock, 77,127,201 but shallower than DCD, > (obviously)
3) Soil Physical Properties: Saturated Hydraulic Conductivity (RHESSys requires Ksat at surface)
-Plot for each 100cm
