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Service Description: This service displays the Bulk Density Less Than 2 mm theme from the GSM v0.5 based on Soil Survey Geographic Database (SSURGO) filled in with STATSGO2 for missing SSURGO data. The Bulk Density Less Than 2 mm theme is displayed by three property values; high, low, and representative. Each value displays the depth range in cm.
Map Name: Layers12
Legend
All Layers and Tables
Layers:
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Bulk Density, < 2 mm, High Estimate (0)
-
Bulk Density, < 2 mm H, Mg/cu. m., 0-5 cm depth (1)
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Bulk Density, < 2 mm H, Mg/cu. m., 5-15 cm depth (2)
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Bulk Density, < 2 mm H, Mg/cu. m., 15-30 cm depth (3)
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Bulk Density, < 2 mm H, Mg/cu. m., 30-60 cm depth (4)
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Bulk Density, < 2 mm H, Mg/cu. m., 60-100 cm depth (5)
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Bulk Density, < 2 mm H, Mg/cu. m., 100-200 cm depth (6)
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Bulk Density, < 2 mm H, Mg/cu. m., total depth prior to spline (7)
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Bulk Density, < 2 mm H, Mg/cu. m., depth available to root zone (8)
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Percent of Map Unit used for weighted avg <2mm soil fraction (9)
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Bulk Density, < 2 mm, Representative Estimate (10)
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Bulk Density, < 2 mm R, Mg/cu. m., 0-5 cm depth (11)
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Bulk Density, < 2 mm R, Mg/cu. m., 5-15 cm depth (12)
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Bulk Density, < 2 mm R, Mg/cu. m., 15-30 cm depth (13)
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Bulk Density, < 2 mm R, Mg/cu. m., 30-60 cm depth (14)
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Bulk Density, < 2 mm R, Mg/cu. m., 60-100 cm depth (15)
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Bulk Density, < 2 mm R, Mg/cu. m., 100-200 cm depth (16)
-
Bulk Density, < 2 mm R, Mg/cu. m., total depth prior to spline (17)
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Bulk Density, <2 mm R, Mg/cu. m., depth available to root zone (18)
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Percent of Map Unit used for weighted avg <2mm soil fraction (19)
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Bulk Density, < 2 mm, Low Estimate (20)
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Bulk Density, < 2 mm L, Mg/cu. m., 0-5 cm depth (21)
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Bulk Density, < 2 mm L, Mg/cu. m., 5-15 cm depth (22)
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Bulk Density, < 2 mm L, Mg/cu. m., 15-30 cm depth (23)
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Bulk Density, < 2 mm L, Mg/cu. m., 30-60 cm depth (24)
-
Bulk Density, < 2 mm L, Mg/cu. m., 60-100 cm depth (25)
-
Bulk Density, < 2 mm L, Mg/cu. m., 100-200 cm depth (26)
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Bulk Density, < 2 mm L, Mg/cu. m., total depth prior to spline (27)
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Bulk Density, < 2 mm L, Mg/cu. m., depth available to root zone (28)
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Percent of Map Unit used for weighted avg <2mm soil fraction (29)
Description: The bulk density (l2mm_bd) table is designed to facilitate thematic mapping. The table is national in extent and can be
used in conjunction with the GSM Version 0.5 grid to map soil bulk density (l2mm_bd) determined on soil fraction less than 2 mm.
The "h", "l", and "r" correspond to "high", "low" and "representative" property values.
The "l" represents the minimum low value of all the components within each map unit and is used as an approximate lower
confidence limit estimate for the map unit at each depth. For the lower estimate above the representative value "r" (due to
incomplete population of high and low values in SSURGO, and anomalies in the spline), the lower
estimate was set to null.
The "h" represents the maximum value of all the components within each map unit and is used as an approximate upper
confidence limit estimate for the map unit at each depth. For the upper estimate above the representative value "r" (due to
incomplete population of high and low values in SSURGO, and anomalies in the spline), the upper
estimate was set to null.
The table can be attached to the raster map layer data using the common "mukeyint" for spatial mapping.
Field | Description |
mukeyint: | Map unit identification key |
source: | SSURGO or STATSGO2 |
count30m: | Number of pixels in the map unit |
km2: | Area in km2 of map unit extent |
muname: | Descriptive map unit name |
mu_dbthirdbar_r_lt2mm_g_cm3_000_005: | bulk density for less than 2 mm soil fraction for 0-5 cm soil thickness |
mu_dbthirdbar_r_lt2mm_g_cm3_005_015: | bulk density for less than 2 mm soil fraction for 5-15 cm soil thickness |
mu_dbthirdbar_r_lt2mm_g_cm3_015_030: | bulk density for less than 2 mm soil fraction for 15-30 cm soil thickness |
mu_dbthirdbar_r_lt2mm_g_cm3_030_060: | bulk density for less than 2 mm soil fraction for 30-60 cm soil thickness |
mu_dbthirdbar_r_lt2mm_g_cm3_060_100: | bulk density for less than 2 mm soil fraction for 60-100 cm soil thickness |
mu_dbthirdbar_r_lt2mm_g_cm3_100_200: | bulk density for less than 2 mm soil fraction for 100-200 cm soil thickness |
mu_dbthirdbar_r_lt2mm_g_cm3_000_999: | bulk density for less than 2 mm soil fraction for total soil thickness prior to spline |
mu_dbthirdbar_r_lt2mm_g_cm3_rootzone: | bulk density for less than 2 mm soil fraction for total soil thickness available to root zone |
mu_sum_comppct_r_fix_dbthirdbar_r_lt2mm: | Percent (by area) of map unit used for weighted average calculation for less than 2 mm soil fraction |
dbthirdbar units: | g per cm3 (g_cm3) |
Horizon values for each component (soil type) were selected only where the data were not missing and the component kind was not ‘Miscellaneous area’. Miscellaneous areas were excluded since they are dominantly occupied by non-soil materials. Major miscellanous areas include badlands, beaches, chutes, cinder lands, dams, dumps, dune lands, glaciers, gullied land, lava flows, mined lands, oil-waste land, pits, playas, riverwash, rock outcrop, rubble land, slickens, urban land and water. Detailed descriptions of each category can be found in the National Soil Survey Handbook, Part 627 - Legend Development and Data Collection, Subpart B - 627.10 (U.S. Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI [http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ref/?cid=nrcs142p2_054242 (accessed 14 February 2018)]. The values for each soil type profile were fit with an equal-area continuous smoothing spline. (Bishop et al., 1999; Odgers et al., 2012) with a smoothing parameter, lambda, set at 0.1 for all properties. The generated spline was used to set property estimates at the GlobalSoilMap standard depth intervals (0-5 cm, 5-15 cm, 15-30 cm, 30-60 cm, 60-100 cm, and 100-200 cm, (GlobalSoilMap, 2012)). For instances where splined values exceeded the lower and upper bounds the property estimate was “capped” at the nearest sensible bound. The representative standard depth estimates for each profile (i.e. component or soil type), were weighted within each map unit (i.e. group of components mapped together), using the component percentage by area of the map unit as the weights. Miscellaneous areas (non-soil materials) did not contribute to the map unit weighted average so the weighted mean represents only the soils in each map unit. The remaining soil components were scaled to represent 100% of the map unit and weighted accordingly in the calculation of the map unit average. Values for map units dominated by non-soil material, or with more than 50% as ‘Miscellaneous area’ were set to null.
Use Limitations: This dataset is not designed for use as a primary regulatory tool in permitting or siting decisions, but may be used as a reference source.
This is public information and may be interpreted by organizations, agencies, units of government, or others based on needs; however,
they are responsible for the appropriate application. Federal, State, or local regulatory bodies are not to reassign to the
Natural Resources Conservation Service any authority for the decisions that they make. The Natural Resources Conservation Service will not
perform any evaluations of these maps for purposes related solely to State or local regulatory programs. Digital data files are
periodically updated. Files are dated, and users are responsible for obtaining the latest version of the data.
Scale Range: Maximum (zoomed in) 1:24,000, Minimum (zoomed out) 1:1,500,000
Citations: Bliss, N., Thompson, J., Hempel, J., Libohova, Z., 2017. GlobalSoilMap Version 0.5: Soil property maps from the State Soil geography (SSURGO) Database
filled in with General Soil Map Database (STATSG02) database for the lower 48 states, USA.
Purpose: Providing the public with a GSM v0.5 dbthirdbar theme service.
Creation Date: 2015
Publication Date: 20180410
Revision Date:
Refresh Cycle: Final product.
Version: 1.0.0
Change Log: Added high, low, and representative estimates. Description edits.
Report Service Errors
Report Data Issues or Questions
Copyright Text: Soil Survey Staff - West Virginia University, Gridded GlobalSoilMap Property maps (GSM, Version 0.5) for conterminous United States, USDA-NRCS.
Spatial Reference:
4326
(4326)
Single Fused Map Cache: false
Initial Extent:
XMin: -100.73777528071967
YMin: 27.2618753811597
XMax: -98.04626270743144
YMax: 33.71601267424884
Spatial Reference: 4326
(4326)
Full Extent:
XMin: -127.88791666665702
YMin: 22.877916666676636
XMax: -65.27458333332372
YMax: 51.60541666667662
Spatial Reference: 4326
(4326)
Units: esriDecimalDegrees
Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP
Document Info:
Title: Layers
Author:
Comments: The bulk density (l2mm_bd) table is designed to facilitate thematic mapping. The table is national in extent and can be
used in conjunction with the GSM Version 0.5 grid to map soil bulk density (l2mm_bd) determined on soil fraction less than 2 mm.
The "h", "l", and "r" correspond to "high", "low" and "representative" property values.
The "l" represents the minimum low value of all the components within each map unit and is used as an approximate lower
confidence limit estimate for the map unit at each depth. For the lower estimate above the representative value "r" (due to
incomplete population of high and low values in SSURGO, and anomalies in the spline), the lower
estimate was set to null.
The "h" represents the maximum value of all the components within each map unit and is used as an approximate upper
confidence limit estimate for the map unit at each depth. For the upper estimate above the representative value "r" (due to
incomplete population of high and low values in SSURGO, and anomalies in the spline), the upper
estimate was set to null.
The table can be attached to the raster map layer data using the common "mukeyint" for spatial mapping.
<table><tr><th>Field</th><th>Description</th></tr>
<tr><td>mukeyint: </td><td>Map unit identification key</td></tr><tr><td>source: </td><td>SSURGO or STATSGO2</td></tr><tr><td>count30m: </td><td>Number of pixels in the map unit</td></tr><tr><td>km2: </td><td>Area in km2 of map unit extent</td></tr><tr><td>muname: </td><td>Descriptive map unit name</td></tr><tr><td>mu_dbthirdbar_r_lt2mm_g_cm3_000_005: </td><td>bulk density for less than 2 mm soil fraction for 0-5 cm soil thickness</td></tr><tr><td>mu_dbthirdbar_r_lt2mm_g_cm3_005_015: </td><td>bulk density for less than 2 mm soil fraction for 5-15 cm soil thickness</td></tr><tr><td>mu_dbthirdbar_r_lt2mm_g_cm3_015_030: </td><td>bulk density for less than 2 mm soil fraction for 15-30 cm soil thickness</td></tr><tr><td>mu_dbthirdbar_r_lt2mm_g_cm3_030_060: </td><td>bulk density for less than 2 mm soil fraction for 30-60 cm soil thickness</td></tr><tr><td>mu_dbthirdbar_r_lt2mm_g_cm3_060_100: </td><td>bulk density for less than 2 mm soil fraction for 60-100 cm soil thickness</td></tr><tr><td>mu_dbthirdbar_r_lt2mm_g_cm3_100_200: </td><td>bulk density for less than 2 mm soil fraction for 100-200 cm soil thickness</td></tr><tr><td>mu_dbthirdbar_r_lt2mm_g_cm3_000_999: </td><td>bulk density for less than 2 mm soil fraction for total soil thickness prior to spline</td></tr><tr><td>mu_dbthirdbar_r_lt2mm_g_cm3_rootzone: </td><td>bulk density for less than 2 mm soil fraction for total soil thickness available to root zone</td></tr><tr><td>mu_sum_comppct_r_fix_dbthirdbar_r_lt2mm: </td><td>Percent (by area) of map unit used for weighted average calculation for less than 2 mm soil fraction</td></tr><tr><td>dbthirdbar units: </td><td>g per cm3 (g_cm3)</td></tr></table>
Horizon values for each component (soil type) were selected only where the data were not missing and the component kind was not ‘Miscellaneous area’. Miscellaneous areas were excluded since they are dominantly occupied by non-soil materials. Major miscellanous areas include badlands, beaches, chutes, cinder lands, dams, dumps, dune lands, glaciers, gullied land, lava flows, mined lands, oil-waste land, pits, playas, riverwash, rock outcrop, rubble land, slickens, urban land and water. Detailed descriptions of each category can be found in the National Soil Survey Handbook, Part 627 - Legend Development and Data Collection, Subpart B - 627.10 (U.S. Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI [http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ref/?cid=nrcs142p2_054242 (accessed 14 February 2018)]. The values for each soil type profile were fit with an equal-area continuous smoothing spline. (Bishop et al., 1999; Odgers et al., 2012) with a smoothing parameter, lambda, set at 0.1 for all properties. The generated spline was used to set property estimates at the GlobalSoilMap standard depth intervals (0-5 cm, 5-15 cm, 15-30 cm, 30-60 cm, 60-100 cm, and 100-200 cm, (GlobalSoilMap, 2012)). For instances where splined values exceeded the lower and upper bounds the property estimate was “capped” at the nearest sensible bound. The representative standard depth estimates for each profile (i.e. component or soil type), were weighted within each map unit (i.e. group of components mapped together), using the component percentage by area of the map unit as the weights. Miscellaneous areas (non-soil materials) did not contribute to the map unit weighted average so the weighted mean represents only the soils in each map unit. The remaining soil components were scaled to represent 100% of the map unit and weighted accordingly in the calculation of the map unit average. Values for map units dominated by non-soil material, or with more than 50% as ‘Miscellaneous area’ were set to null.
<p><strong>Use Limitations: </strong>This dataset is not designed for use as a primary regulatory tool in permitting or siting decisions, but may be used as a reference source.
This is public information and may be interpreted by organizations, agencies, units of government, or others based on needs; however,
they are responsible for the appropriate application. Federal, State, or local regulatory bodies are not to reassign to the
Natural Resources Conservation Service any authority for the decisions that they make. The Natural Resources Conservation Service will not
perform any evaluations of these maps for purposes related solely to State or local regulatory programs. Digital data files are
periodically updated. Files are dated, and users are responsible for obtaining the latest version of the data.<br/>
<strong>Scale Range: </strong>Maximum (zoomed in) 1:24,000, Minimum (zoomed out) 1:1,500,000<br/>
<strong>Citations: </strong>Bliss, N., Thompson, J., Hempel, J., Libohova, Z., 2017. GlobalSoilMap Version 0.5: Soil property maps from the State Soil geography (SSURGO) Database
filled in with General Soil Map Database (STATSG02) database for the lower 48 states, USA.<br/>
<strong>Purpose: </strong>Providing the public with a GSM v0.5 dbthirdbar theme service.</strong><br/>
<strong>Creation Date: </strong>2015<br/>
<strong>Publication Date: </strong>20180410<br/>
<strong>Revision Date: </strong><br/>
<strong>Refresh Cycle: </strong>Final product.<br/>
<strong>Version: </strong>1.0.0<br/>
<strong>Change Log: </strong>Added high, low, and representative estimates. Description edits.<br/>
<strong><a href="mailto:usdanrcs@midatl.service-now.com?Subject=GEOSRV" target="_top">Report Service Errors</a></strong><br/>
<strong><a href="mailto:SoilsHotline@lin.usda.gov?Subject=Global Soils v0.5 on nrcsgeoservices " target="_top">Report Data Issues or Questions</a></strong><br/>
Subject: Bulk Density Less Than 2 mm derived from Version 0.5 of GSM for United States based on SSURGO filled in with STATSGO2 for missing SSURGO data.
Category:
Keywords: GlobalSoilMap,Soil,Properties,raster,gridded,soils,properties,dbthirdbar,standard,depths
AntialiasingMode: None
TextAntialiasingMode: Force
Supports Dynamic Layers: false
Resampling: false
MaxRecordCount: 1000
MaxImageHeight: 4096
MaxImageWidth: 4096
Supported Query Formats: JSON, geoJSON, PBF
Supports Query Data Elements: true
Min Scale: 0
Max Scale: 0
Supports Datum Transformation: true
Child Resources:
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Supported Operations:
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