| coarsef units: <\/td> | m3 per m3 (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- WM - a weighted average was calculated for more than one available component within a map unit.<\/li>\n
- SC - for map units with only one component.<\/li>\n
- OA - for map units with more than one component, but only one component is available (not null and not miscellaneous).<\/li><\/ul><\/p>\n
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.\nCoarse fragments (m3m-3) was calculated from:\n | Field<\/th> | Description<\/th><\/tr>\n |
|---|
| fraggt10: <\/td> | The percent by weight of the horizon occupied by rock fragments greater than 10 inches in size<\/td><\/tr> | | frag3to10: <\/td> | The percent by weight of the horizon occupied by rock fragments 3 to 10 inches in size<\/td><\/tr> | | sieveno10: <\/td> | Soil fraction passing a number 10 sieve (2.00mm square opening) as a weight percentage of the less than 3 inch fraction<\/td><\/tr> | | dbthirdbar: <\/td> | 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<\/td><\/tr> | | Particle size density: <\/td> | 2.65 gr cm3<\/td><\/tr><\/table>\n- The formula for calculating Coarsef:\nPercent Wt = [(100 - (fraggt10 + frag3to10) x (100 - sieveno10) + fraggt10 + frag3to10]/100<\/li>\n
- Coarse Fragments = [(Percent Wt/2.65)/(100-Percent Wt/dbthirdbar) + (Percent Wt/2.65)]<\/li><\/ul>\nUse 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.<\/strong>
\nScale Range: <\/strong>Maximum (zoomed in) 1:250,000, Minimum (zoomed out) 1:1,500,000
\nCitations: <\/strong><\/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.
\n<\/p>\nPurpose: <\/strong>Providing the public with a GSM v0.1 coarse fragments theme service.<\/strong>
\nCreation Date: <\/strong>2015
\nPublication Date: <\/strong>20180124
\nRevision Date: <\/strong>20180410
\nRefresh Cycle: <\/strong>Final product.
\nVersion: <\/strong>1.0.1
\nChange Log: <\/strong>Description edits.
\nReport Service Errors<\/a><\/strong>
\nReport Data Issues or Questions<\/a><\/strong>
",
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