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Service Description: This service displays the pH 1:5 Water theme from the GSM v0.5 based on Soil Survey Geographic Database (SSURGO) filled in with STATSGO2 for missing SSURGO data. The pH 1:5 Water theme is displayed by three property values; high, low, and representative. Each value displays the depth range in cm.

Map Name: Layers18

Legend

All Layers and Tables

Layers:

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

Description: The "PH" table is designed to facilitate thematic mapping. The tabes are national in extent and can be used in conjunction with the GSM Version 0.5 grid to map soil pH. 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 pH (ph) 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_ph1to5h2o_r_ions_pH_000_005:	Value for representative ph 1:5 Water in the 0-5 cm depth interval
mu_ph1to5h2o_r_ions_pH_005_015:	Value for representative ph 1:5 Water in the 5-15 cm depth interval
mu_ph1to5h2o_r_ions_pH_015_030:	Value for representative ph 1:5 Water in the 15-30 cm depth interval
mu_ph1to5h2o_r_ions_pH_030_060:	Value for representative ph 1:5 Water in the 30-60 cm depth interval
mu_ph1to5h2o_r_ions_pH_060_100:	Value for representative ph 1:5 Water in the 60-100 cm depth interval
mu_ph1to5h2o_r_ions_pH_100_200:	Value for representative ph 1:5 Water in the 100-200 cm depth interval
mu_ph1to5h2o_r_ions_pH_000_999:	Value for representative ph 1:5 Water for total soil thickness prior to spline
mu_ph1to5h2o_r_ions_pH_rootzone:	Value for representative ph 1:5 Water for total soil thickness available to root zone

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. After map unit averages for the representative values were calculated for clay, silt, and sand, each property was scaled proportionally to ensure the three properties add up to 100 % equivalent to 1000 g/kg (GlobalSoilMap specifications). Although this had little effect on most of the estimates, it corrects for the small changes induced by splining and averaging the components within each map unit. Deficiencies in the original STATSGO2 database were noticed in that some clay, silt, and sand horizon measurements were missing, set to zero, and/or did not add up to 100%. To convert the pH 1:1 H2O (pH1:1w) found in STATSGO2 to 1:5 H2O (pH1:5w) as required by the GlobalSoilMap.net specification, the following conversion formula was employed (Libohova et al., 2012):pH1:5w = pH1:1w * 1.05-0.51. Following the conversion, the spline tool was used after converting pH to hydrogen cation concentration as opposed to splining the pH values. After splining and finding map unit Following the conversion of our data into pH1:5w, the spline tool was used after converting pH to hydrogen cation concentration as opposed to splining the pH values. After splining and finding map unit averages, hydrogen cation concentration was converted back into pHx10 as a final step.averages, hydrogen cation concentration was converted back into pHx10 as a final step.

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 pH 1:5 water 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.
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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: -238.56380314589535
YMin: -252.29726557820337
XMax: 45.40130314591465
YMax: 428.6394688970554
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 "PH" table is designed to facilitate thematic mapping. The tabes are national in extent and can be used in conjunction with the GSM Version 0.5 grid to map soil pH. 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 pH (ph) 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_ph1to5h2o_r_ions_pH_000_005: </td><td>Value for representative ph 1:5 Water in the 0-5 cm depth interval</td></tr><tr><td>mu_ph1to5h2o_r_ions_pH_005_015: </td><td>Value for representative ph 1:5 Water in the 5-15 cm depth interval</td></tr><tr><td>mu_ph1to5h2o_r_ions_pH_015_030: </td><td>Value for representative ph 1:5 Water in the 15-30 cm depth interval</td></tr><tr><td>mu_ph1to5h2o_r_ions_pH_030_060: </td><td>Value for representative ph 1:5 Water in the 30-60 cm depth interval</td></tr><tr><td>mu_ph1to5h2o_r_ions_pH_060_100: </td><td>Value for representative ph 1:5 Water in the 60-100 cm depth interval</td></tr><tr><td>mu_ph1to5h2o_r_ions_pH_100_200: </td><td>Value for representative ph 1:5 Water in the 100-200 cm depth interval</td></tr><tr><td>mu_ph1to5h2o_r_ions_pH_000_999: </td><td>Value for representative ph 1:5 Water for total soil thickness prior to spline</td></tr><tr><td>mu_ph1to5h2o_r_ions_pH_rootzone: </td><td>Value for representative ph 1:5 Water for total soil thickness available to root zone</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. After map unit averages for the representative values were calculated for clay, silt, and sand, each property was scaled proportionally to ensure the three properties add up to 100 % equivalent to 1000 g/kg (GlobalSoilMap specifications). Although this had little effect on most of the estimates, it corrects for the small changes induced by splining and averaging the components within each map unit. Deficiencies in the original STATSGO2 database were noticed in that some clay, silt, and sand horizon measurements were missing, set to zero, and/or did not add up to 100%. To convert the pH 1:1 H2O (pH1:1w) found in STATSGO2 to 1:5 H2O (pH1:5w) as required by the GlobalSoilMap.net specification, the following conversion formula was employed (Libohova et al., 2012):pH1:5w = pH1:1w * 1.05-0.51. Following the conversion, the spline tool was used after converting pH to hydrogen cation concentration as opposed to splining the pH values. After splining and finding map unit Following the conversion of our data into pH1:5w, the spline tool was used after converting pH to hydrogen cation concentration as opposed to splining the pH values. After splining and finding map unit averages, hydrogen cation concentration was converted back into pHx10 as a final step.averages, hydrogen cation concentration was converted back into pHx10 as a final step. <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 pH 1:5 water 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: pH 1:5 Water 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,ph,standard,depths
AntialiasingMode: None
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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