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Service Description: This service displays the Gravel theme from the GSM v0.5 based on Soil Survey Geographic Database (SSURGO) filled in with STATSGO2 for missing SSURGO data. The Gravel theme is displayed by three property values; high, low, and representative. Each value displays the depth range in cm.

Map Name: Layers17

Legend

All Layers and Tables

Layers:

• Gravel, m3 per m3, High Estimate (0)
  • Gravel, m3 m3 H, 0-5 cm depth (1)
  • Gravel, m3 m3 H, 5-15 cm depth (2)
  • Gravel, m3 m3 H, 15-30 cm depth (3)
  • Gravel, m3 m3 H, 30-60 cm depth (4)
  • Gravel, m3 m3 H, 60-100 cm depth (5)
  • Gravel, m3 m3 H, 100-200 cm depth (6)
  • Gravel, m3 m3 H, total depth prior to spline (7)
  • Gravel, m3 m3 H, depth available to root zone (8)
  • Percent of Map Unit Used for Weighted Avg Calculation (9)
• Gravel, m3 per m3, Representative Estimate (10)
  • Gravel, m3 m3 R, 0-5 cm depth (11)
  • Gravel, m3 m3 R, 5-15 cm depth (12)
  • Gravel, m3 m3 R, 15-30 cm depth (13)
  • Gravel, m3 m3 R, 30-60 cm depth (14)
  • Gravel, m3 m3 R, 60-100 cm depth (15)
  • Gravel, m3 m3 R, 100-200 cm depth (16)
  • Gravel, m3 m3 R, total depth prior to spline (17)
  • Gravel, m3 m3 R, depth available to root zone (18)
  • Percent of Map Unit Used for Weighted Avg Calculation (19)
• Gravel, m3 per m3, Low Estimate (20)
  • Gravel, m3 per m3 L, 0-5 cm depth (21)
  • Gravel, m3 per m3 L, 5-15 cm depth (22)
  • Gravel, m3 per m3 L, 15-30 cm depth (23)
  • Gravel, m3 per m3 L, 30-60 cm depth (24)
  • Gravel, m3 per m3 L, 60-100 cm depth (25)
  • Gravel, m3 per m3 L, 100-200 cm depth (26)
  • Gravel, m3 per m3 L, total depth prior to spline (27)
  • Gravel, m3 per m3 L, depth available to root zone (28)
  • Percent of Map Unit Used for Weighted Avg Calculation (29)

Description: The coarse fragments (gravel) 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 coarse fragments (gravel). 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. This table represents coarse fragments (gravel) soil property.

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_gravel_r_vol_ratio_m3_m3_000_005:	gravel as volume ratio for 0-5 cm soil thickness
mu_gravel_r_vol_ratio_m3_m3_005_015:	gravel as volume ratio for 5-15 cm soil thickness
mu_gravel_r_vol_ratio_m3_m3_015_030:	gravel as volume ratio for 15-30 cm soil thickness
mu_gravel_r_vol_ratio_m3_m3_030_060:	gravel as volume ratio for 30-60 cm soil thickness
mu_gravel_r_vol_ratio_m3_m3_060_100:	gravel as volume ratio for 60-100 cm soil thickness
mu_gravel_r_vol_ratio_m3_m3_100_200:	gravel as volume ratio for 100-200 cm soil thickness
mu_gravel_r_vol_ratio_m3_m3_000_999:	gravel as volume ratio for total soil thickness prior to spline
mu_gravel_r_vol_ratio_m3_m3_rootzone:	gravel as volume ratio for total soil thickness available to root zone
mu_sum_comppct_r_fix_gravel_r_vol_ratio_m3_m3:	Percent (by area) of map unit used for weighted average calculation
gravel units:	m3 per m3 as volume ratio

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.

Coarse fragments (m3m-3) was calculated from:

• fraggt10: The percent by weight of the horizon occupied by rock fragments greater than 10 inches in size.
• frag3to10: The percent by weight of the horizon occupied by rock fragments 3 to 10 inches in size.
• sieveno10: Soil fraction passing a number 10 sieve (2.00mm square opening) as a weight percentage of the less than 3 inch fraction.
• dbthirdbar: The oven dry weight of the less than 2 mm soil material per unit volume of soil at a water tension of 1/3 bar.
• Particle size density: 2.65 gr cm3

The formula for calculating Coarsef:

• Percent Wt = [(100 - (fraggt10 + frag3to10) x (100 - sieveno10) + fraggt10 + frag3to10]/100
• Coarse Fragments = [(Percent Wt/2.65)/(100-Percent Wt/dbthirdbar) + (Percent Wt/2.65)]

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 gravel theme service.
Creation Date: 2015
Publication Date: 20180124
Revision Date: 20180410
Refresh Cycle: Final product.
Version: 2.0.0
Change Log: Added high, low, and representative estimates. Description edits.
Report Service Errors
Report Data Issues or Questions


Copyright Text: Soil Survey Staff - University of West Virginia, 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: -97.71012839183898
YMin: 33.69226381136796
XMax: -97.15567704571323
YMax: 35.02181550871031
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 coarse fragments (gravel) 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 coarse fragments (gravel). 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. This table represents coarse fragments (gravel) soil property. <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_gravel_r_vol_ratio_m3_m3_000_005: </td><td>gravel as volume ratio for 0-5 cm soil thickness</td></tr><tr><td>mu_gravel_r_vol_ratio_m3_m3_005_015: </td><td>gravel as volume ratio for 5-15 cm soil thickness</td></tr><tr><td>mu_gravel_r_vol_ratio_m3_m3_015_030: </td><td>gravel as volume ratio for 15-30 cm soil thickness</td></tr><tr><td>mu_gravel_r_vol_ratio_m3_m3_030_060: </td><td>gravel as volume ratio for 30-60 cm soil thickness</td></tr><tr><td>mu_gravel_r_vol_ratio_m3_m3_060_100: </td><td>gravel as volume ratio for 60-100 cm soil thickness</td></tr><tr><td>mu_gravel_r_vol_ratio_m3_m3_100_200: </td><td>gravel as volume ratio for 100-200 cm soil thickness</td></tr><tr><td>mu_gravel_r_vol_ratio_m3_m3_000_999: </td><td>gravel as volume ratio for total soil thickness prior to spline</td></tr><tr><td>mu_gravel_r_vol_ratio_m3_m3_rootzone: </td><td>gravel as volume ratio for total soil thickness available to root zone</td></tr><tr><td>mu_sum_comppct_r_fix_gravel_r_vol_ratio_m3_m3: </td><td>Percent (by area) of map unit used for weighted average calculation</td></tr><tr><td>gravel units: </td><td>m3 per m3 as volume ratio</td></tr></table> <p>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> <p>Coarse fragments (m3m-3) was calculated from: <ul><li>fraggt10: The percent by weight of the horizon occupied by rock fragments greater than 10 inches in size.</li><li>frag3to10: The percent by weight of the horizon occupied by rock fragments 3 to 10 inches in size.</li><li>sieveno10: Soil fraction passing a number 10 sieve (2.00mm square opening) as a weight percentage of the less than 3 inch fraction.</li><li>dbthirdbar: The oven dry weight of the less than 2 mm soil material per unit volume of soil at a water tension of 1/3 bar.</li><li>Particle size density: 2.65 gr cm3</li></ul></p> <p>The formula for calculating Coarsef: <ul><li>Percent Wt = [(100 - (fraggt10 + frag3to10) x (100 - sieveno10) + fraggt10 + frag3to10]/100</li><li>Coarse Fragments = [(Percent Wt/2.65)/(100-Percent Wt/dbthirdbar) + (Percent Wt/2.65)]</li></ul></p> <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 gravel theme service.</strong><br/> <strong>Creation Date: </strong>2015<br/> <strong>Publication Date: </strong>20180124<br/> <strong>Revision Date: </strong>20180410<br/> <strong>Refresh Cycle: </strong>Final product.<br/> <strong>Version: </strong>2.0.0<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: Gravel 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,gravel,standard,depths
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TextAntialiasingMode: Force

Supports Dynamic Layers: 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



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