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 "description": "The \"ecec_h\", \"ecec_l\" and \"ecec_r\" tables are designed to facilitate thematic mapping. The tables are national in extent and can be \nused in conjunction with the GSM Version 0.1 grid to map effective cation exchange capacity (ecec). The \"h\", \"l\", and \"r\" correspond to \n\"high\", \"low\" and \"representative\" property values. \nThe \"l\" represents the minimum low value of all the components within each map unit and is used as an approximate lower \nconfidence limit estimate for the map unit at each depth. For the lower estimate above the representative value \"r\" (due to\nincomplete population of high and low values in STATSGO2, and anomalies in the spline), the lower\nestimate was set to null.\nThe \"h\" represents the maximum value of all the components within each map unit and is used as an approximate upper \nconfidence limit estimate for the map unit at each depth. For the upper estimate above the representative value \"r\" (due to\nincomplete population of high and low values in STATSGO2, and anomalies in the spline), the upper\nestimate was set to null.        \nThe tables can be attached to the raster map layer data using the common \"mukey\" for spatial mapping. This table represents Effective Cation Exchange Capacity (ecec) soil property. Each table contains 50 columns.\n<table><tr><th>Field<\/th><th>Description<\/th><\/tr>\n<tr><td>mukey: <\/td><td>Map unit identification key<\/td><\/tr><tr><td>tot_comps: <\/td><td>Total number of components within the map unit<\/td><\/tr><tr><td>ecectot_r0to5: <\/td><td>Value for representative ecec in the 0-5 cm depth interval<\/td><\/tr><tr><td>cntrb_ecectot_r0to5: <\/td><td>Percent (by area) of map unit used for weighted average calculation for 0-5 cm interval<\/td><\/tr><tr><td>null_pct_ecectot_r_0to5: <\/td><td>Percent (by area) of map unit that has missing data for 0-5 cm interval<\/td><\/tr><tr><td>misc_pct_ecec_r_0to5: <\/td><td>Percent (by area) of map unit that is nonsoil material (miscellaneous) for 0-5 cm interval<\/td><\/tr><tr><td>avail_ecec_r0to5: <\/td><td>Number of map unit components that are soil and not null for 0-5 cm interval<\/td><\/tr><tr><td>missing_ecec_r0to5: <\/td><td>Number of map unit components that are nonsoil material or null for 0-5 cm interval<\/td><\/tr><tr><td>datatype_ecec_r0to5: <\/td><td>The type of calculation used to find the value for the map unit (either WM, SC, or OA)<\/td><\/tr><tr><td>ecec units: <\/td><td>meq/100g equivalent to 1 cmol/kg or 10 mmol/kg (GlobalSoilMap specifications)<\/td><\/tr><\/table>\nColumns \"mukey\" and \"tot_comps\" are unique. The remaining columns are repeated for each depth:\n5to15, 15to30, 30to60, 60to100, 100to200.    \nThe \"datatype\" column is populated with three options:\n<ul><li>WM - a weighted average was calculated for more than one available component within a map unit.<\/li>\n<li>SC - for map units with only one component.<\/li>\n<li>OA - for map units with more than one component, but only one component is available (not null and not miscellaneous).<\/li><\/ul>\n<p>The U.S. National Soil Survey Center (NSSC) uses pH-7 amonium acetate cation extraction\n(CEC7) to estimate ECEC for pH values greater than 5.5, and adds 1N KCl extractable Aluminum to that\nestimate for pH less than 5.5 to approximate ECEC (Soil Survey Laboratory, Staff, 1996; West and\nLibohova, 2012). Thus ECEC is largely unattributed in the STATSGO2 database where pH is greater than 5.5, \nhence CEC7 can be used as ECEC above pH 5.5 (West and Libohova, 2012). ECEC (CEC7 + Acidity) was well-attributed at or below pH 5.5 \nECEC property values were combined with the CEC values above pH 5.5 to get estimates for all the map units.<\/p>\n<p>Horizon values for each component (soil type) were selected only where the data were not missing and \nthe component kind was not \u2018Miscellaneous area\u2019. Miscellaneous areas were excluded since they are dominantly occupied by\nnon-soil materials. Major miscellaneous areas include badlands, beaches, chutes, cinder lands, dams, dumps, dune lands, glaciers, gullied land,\nlava flows, mined lands, oil-waste land, pits, playas, riverwash, rock outcrop, rubble land, slickens, urban land and water. \nDetailed descriptions of each category can be found in the National Soil Survey Handbook, Part 627 - Legend Development and Data Collection, \nSubpart B - 627.10 (U.S. Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI \n[http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ref/?cid=nrcs142p2_054242 (accessed 14 February 2018)].\nThe values for each soil type profile were fit with an equal-area continuous smoothing spline. \n(Bishop et al., 1999; Odgers et al., 2012) with a smoothing parameter, lambda, set at 0.1 for all properties.\nThe 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,\nand 100-200 cm (GlobalSoilMap, 2012)).\nFor instances where splined values exceeded the lower and upper bounds the property estimate was \u201ccapped\u201d at the nearest sensible bound.\nThe representative standard depth estimates for each profile (i.e. component or soil type), were weighted within each map unit \n(i.e. group of components mapped together), using the component percentage by area of the map unit as the weights. Miscellaneous areas (non-soil\nmaterials) did not contribute to the map unit weighted average so the weighted mean represents only the\nsoils in each map unit. The remaining soil components were scaled to represent 100% of the map unit\nand weighted accordingly in the calculation of the map unit average. Values for map units dominated by non-soil material, or with more than 50% \nas \u2018Miscellaneous area\u2019 were set to null.\nAfter map unit averages for the representative values were calculated for clay, silt, and sand, each property was scaled proportionally to ensure the \nthree properties add up to 100 % equivalent to 1000 g/kg (GlobalSoilMap specifications). Although this had little effect on most of the estimates, \nit corrects for the small changes induced by splining and averaging the components within each map unit. Deficiencies in the original STATSGO2 database were\nnoticed in that some clay, silt, and sand horizon measurements were missing, set to zero, and/or did not add up to 100%.<\/p>\n\n<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. \nThis is public information and may be interpreted by organizations, agencies, units of government, or others based on needs; however, \nthey are responsible for the appropriate application. Federal, State, or local regulatory bodies are not to reassign to the \nNatural Resources Conservation Service any authority for the decisions that they make. The Natural Resources Conservation Service will not \nperform any evaluations of these maps for purposes related solely to State or local regulatory programs. Digital data files are \nperiodically updated. Files are dated, and users are responsible for obtaining the latest version of the data.<br/>\n<strong>Scale Range: <\/strong>Maximum (zoomed in) 1:250,000, Minimum (zoomed out) 1:1,500,000<br/>\n<strong>Citations: <\/strong>Helmick, J., Nauman, T., Thompson, J., Burkholder, A., Hempel, J., Odgers, N., Libohova, Z., 2017. GlobalSoilMap Version 0.1: \nSoil property maps from the General Soil Map Database (STATSG02) database for the USA.<br/><\/p>\n<strong>Purpose: <\/strong>Providing the public with a GSM v0.1 effective cation exchange capacity theme service.<\/strong><br/>\n<strong>Creation Date: <\/strong>2015<br/>\n<strong>Publication Date: <\/strong>20180124<br/>\n<strong>Revision Date: <\/strong>20180410<br/>\n<strong>Refresh Cycle: <\/strong>Final product.<br/>\n<strong>Version: <\/strong>1.0.1<br/>\n<strong>Change Log: <\/strong>Description edits.<br/>\n<strong><a href=\"mailto:usdanrcs@midatl.service-now.com?Subject=GEOSRV\" target=\"_top\">Report Service Errors<\/a><\/strong><br/> \n<strong><a href=\"mailto:SoilsHotline@lin.usda.gov?Subject=Global Soils v0.1 on nrcsgeoservices \" target=\"_top\">Report Data Issues or Questions<\/a><\/strong><br/>",
 "copyrightText": "Soil Survey Staff - West Virginia University, Gridded GlobalSoilMap Property maps (GSM, Version 0.1) for conterminous United States, USDA-NRCS",
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  "Comments": "The \"ecec_h\", \"ecec_l\" and \"ecec_r\" tables are designed to facilitate thematic mapping. The tables are national in extent and can be \nused in conjunction with the GSM Version 0.1 grid to map effective cation exchange capacity (ecec). The \"h\", \"l\", and \"r\" correspond to \n\"high\", \"low\" and \"representative\" property values. \nThe \"l\" represents the minimum low value of all the components within each map unit and is used as an approximate lower \nconfidence limit estimate for the map unit at each depth. For the lower estimate above the representative value \"r\" (due to\nincomplete population of high and low values in STATSGO2, and anomalies in the spline), the lower\nestimate was set to null.\nThe \"h\" represents the maximum value of all the components within each map unit and is used as an approximate upper \nconfidence limit estimate for the map unit at each depth. For the upper estimate above the representative value \"r\" (due to\nincomplete population of high and low values in STATSGO2, and anomalies in the spline), the upper\nestimate was set to null.        \nThe tables can be attached to the raster map layer data using the common \"mukey\" for spatial mapping. This table represents Effective Cation Exchange Capacity (ecec) soil property. Each table contains 50 columns.\n<table><tr><th>Field<\/th><th>Description<\/th><\/tr>\n<tr><td>mukey: <\/td><td>Map unit identification key<\/td><\/tr><tr><td>tot_comps: <\/td><td>Total number of components within the map unit<\/td><\/tr><tr><td>ecectot_r0to5: <\/td><td>Value for representative ecec in the 0-5 cm depth interval<\/td><\/tr><tr><td>cntrb_ecectot_r0to5: <\/td><td>Percent (by area) of map unit used for weighted average calculation for 0-5 cm interval<\/td><\/tr><tr><td>null_pct_ecectot_r_0to5: <\/td><td>Percent (by area) of map unit that has missing data for 0-5 cm interval<\/td><\/tr><tr><td>misc_pct_ecec_r_0to5: <\/td><td>Percent (by area) of map unit that is nonsoil material (miscellaneous) for 0-5 cm interval<\/td><\/tr><tr><td>avail_ecec_r0to5: <\/td><td>Number of map unit components that are soil and not null for 0-5 cm interval<\/td><\/tr><tr><td>missing_ecec_r0to5: <\/td><td>Number of map unit components that are nonsoil material or null for 0-5 cm interval<\/td><\/tr><tr><td>datatype_ecec_r0to5: <\/td><td>The type of calculation used to find the value for the map unit (either WM, SC, or OA)<\/td><\/tr><tr><td>ecec units: <\/td><td>meq/100g equivalent to 1 cmol/kg or 10 mmol/kg (GlobalSoilMap specifications)<\/td><\/tr><\/table>\nColumns \"mukey\" and \"tot_comps\" are unique. The remaining columns are repeated for each depth:\n5to15, 15to30, 30to60, 60to100, 100to200.    \nThe \"datatype\" column is populated with three options:\n<ul><li>WM - a weighted average was calculated for more than one available component within a map unit.<\/li>\n<li>SC - for map units with only one component.<\/li>\n<li>OA - for map units with more than one component, but only one component is available (not null and not miscellaneous).<\/li><\/ul>\n<p>The U.S. National Soil Survey Center (NSSC) uses pH-7 amonium acetate cation extraction\n(CEC7) to estimate ECEC for pH values greater than 5.5, and adds 1N KCl extractable Aluminum to that\nestimate for pH less than 5.5 to approximate ECEC (Soil Survey Laboratory, Staff, 1996; West and\nLibohova, 2012). Thus ECEC is largely unattributed in the STATSGO2 database where pH is greater than 5.5, \nhence CEC7 can be used as ECEC above pH 5.5 (West and Libohova, 2012). ECEC (CEC7 + Acidity) was well-attributed at or below pH 5.5 \nECEC property values were combined with the CEC values above pH 5.5 to get estimates for all the map units.<\/p>\n<p>Horizon values for each component (soil type) were selected only where the data were not missing and \nthe component kind was not \u2018Miscellaneous area\u2019. Miscellaneous areas were excluded since they are dominantly occupied by\nnon-soil materials. Major miscellaneous areas include badlands, beaches, chutes, cinder lands, dams, dumps, dune lands, glaciers, gullied land,\nlava flows, mined lands, oil-waste land, pits, playas, riverwash, rock outcrop, rubble land, slickens, urban land and water. \nDetailed descriptions of each category can be found in the National Soil Survey Handbook, Part 627 - Legend Development and Data Collection, \nSubpart B - 627.10 (U.S. Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI \n[http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ref/?cid=nrcs142p2_054242 (accessed 14 February 2018)].\nThe values for each soil type profile were fit with an equal-area continuous smoothing spline. \n(Bishop et al., 1999; Odgers et al., 2012) with a smoothing parameter, lambda, set at 0.1 for all properties.\nThe 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,\nand 100-200 cm (GlobalSoilMap, 2012)).\nFor instances where splined values exceeded the lower and upper bounds the property estimate was \u201ccapped\u201d at the nearest sensible bound.\nThe representative standard depth estimates for each profile (i.e. component or soil type), were weighted within each map unit \n(i.e. group of components mapped together), using the component percentage by area of the map unit as the weights. Miscellaneous areas (non-soil\nmaterials) did not contribute to the map unit weighted average so the weighted mean represents only the\nsoils in each map unit. The remaining soil components were scaled to represent 100% of the map unit\nand weighted accordingly in the calculation of the map unit average. Values for map units dominated by non-soil material, or with more than 50% \nas \u2018Miscellaneous area\u2019 were set to null.\nAfter map unit averages for the representative values were calculated for clay, silt, and sand, each property was scaled proportionally to ensure the \nthree properties add up to 100 % equivalent to 1000 g/kg (GlobalSoilMap specifications). Although this had little effect on most of the estimates, \nit corrects for the small changes induced by splining and averaging the components within each map unit. Deficiencies in the original STATSGO2 database were\nnoticed in that some clay, silt, and sand horizon measurements were missing, set to zero, and/or did not add up to 100%.<\/p>\n\n<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. \nThis is public information and may be interpreted by organizations, agencies, units of government, or others based on needs; however, \nthey are responsible for the appropriate application. Federal, State, or local regulatory bodies are not to reassign to the \nNatural Resources Conservation Service any authority for the decisions that they make. The Natural Resources Conservation Service will not \nperform any evaluations of these maps for purposes related solely to State or local regulatory programs. Digital data files are \nperiodically updated. Files are dated, and users are responsible for obtaining the latest version of the data.<br/>\n<strong>Scale Range: <\/strong>Maximum (zoomed in) 1:250,000, Minimum (zoomed out) 1:1,500,000<br/>\n<strong>Citations: <\/strong>Helmick, J., Nauman, T., Thompson, J., Burkholder, A., Hempel, J., Odgers, N., Libohova, Z., 2017. GlobalSoilMap Version 0.1: \nSoil property maps from the General Soil Map Database (STATSG02) database for the USA.<br/><\/p>\n<strong>Purpose: <\/strong>Providing the public with a GSM v0.1 effective cation exchange capacity theme service.<\/strong><br/>\n<strong>Creation Date: <\/strong>2015<br/>\n<strong>Publication Date: <\/strong>20180124<br/>\n<strong>Revision Date: <\/strong>20180410<br/>\n<strong>Refresh Cycle: <\/strong>Final product.<br/>\n<strong>Version: <\/strong>1.0.1<br/>\n<strong>Change Log: <\/strong>Description edits.<br/>\n<strong><a href=\"mailto:usdanrcs@midatl.service-now.com?Subject=GEOSRV\" target=\"_top\">Report Service Errors<\/a><\/strong><br/> \n<strong><a href=\"mailto:SoilsHotline@lin.usda.gov?Subject=Global Soils v0.1 on nrcsgeoservices \" target=\"_top\">Report Data Issues or Questions<\/a><\/strong><br/>",
  "Subject": "Effective Cation Exchange Capacity derived from Version 0.1 of GSM for United States based on U.S. General Soil Map (STATSGO2)",
  "Category": "",
  "AntialiasingMode": "None",
  "TextAntialiasingMode": "Force",
  "Keywords": "GlobalSoilMap,Soil,Properties,raster,gridded,soils,properties,cation,exchange,standard,depths"
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