| Soil Mapping Units (polygons) of Loudoun County, VA (2010) | |
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Data format: SDE Feature Class File or table name: GISDBB.GISBROW.SOILS_POLY Coordinate system: Lambert Conformal Conic Theme keywords: geoscientificInformation, soil, soil series, soil association, geology, land use, slope, mapping unit potential, rock, bedrock, wetness, plastic, limestone, karst, floodplain |
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Abstract:
The general soil association map outlines broad areas which have distinctive patterns in landscape and general geographic appearance. Each of the soil associations has a unique set of features which effect general use and management including shape and length of slope; width of ridgetops and valleys; frequency, size, and direction of streams; type of vegetation, rate of growth; and agriculture. These differences are largely the result of broad differences in kinds of soils and in the geologic materials from which the soils formed. A mapping unit typically consists of one or more major soils with minor soils, and is named for the major soils.
This map shows, in small scale, a summary of the information contained on the individual detailed soil maps for Loudoun County. Because of its small scale and general soil descriptions, it is not suitable for planning small areas or specific sites, but it does present a general picture of soils in the County, and can show large areas generally suited to a particular kind of agriculture or other special land use. For more detailed and specific soils information, please refer to the detailed soils maps and other information available from the County Soil Scientist.
Digital data consists of mapping units of the various soil types found in Loudoun County, Virginia. The data were collected by digitizing manuscript maps derived from USDA soil maps and supplemented by both field work and geological data.
Field work for the soil survey was first conducted between 1947 and 1952. Soils were originally shown at the scale of 1:15840 and then redrafted by the County soil scientist to 1:12000; the data were redrafted a final time to fit Loudoun County's base map standard of 1:2400.
Although the current data rely heavily on the original soil survey, there have been extensive field checks and alterations to the soil map based on current soil concepts and land use. The data are updated as field site inspections or interpretation changes occur. |
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Metadata elements shown with blue text are defined in the Federal Geographic Data Committee's (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM). Elements shown with green text are defined in the ESRI Profile of the CSDGM. Elements shown with a green asterisk (*) will be automatically updated by ArcCatalog. ArcCatalog adds hints indicating which FGDC elements are mandatory; these are shown with gray text.
The general soil association map outlines broad areas which have distinctive patterns in landscape and general geographic appearance. Each of the soil associations has a unique set of features which effect general use and management including shape and length of slope; width of ridgetops and valleys; frequency, size, and direction of streams; type of vegetation, rate of growth; and agriculture. These differences are largely the result of broad differences in kinds of soils and in the geologic materials from which the soils formed. A mapping unit typically consists of one or more major soils with minor soils, and is named for the major soils.
This map shows, in small scale, a summary of the information contained on the individual detailed soil maps for Loudoun County. Because of its small scale and general soil descriptions, it is not suitable for planning small areas or specific sites, but it does present a general picture of soils in the County, and can show large areas generally suited to a particular kind of agriculture or other special land use. For more detailed and specific soils information, please refer to the detailed soils maps and other information available from the County Soil Scientist.
Digital data consists of mapping units of the various soil types found in Loudoun County, Virginia. The data were collected by digitizing manuscript maps derived from USDA soil maps and supplemented by both field work and geological data.
Field work for the soil survey was first conducted between 1947 and 1952. Soils were originally shown at the scale of 1:15840 and then redrafted by the County soil scientist to 1:12000; the data were redrafted a final time to fit Loudoun County's base map standard of 1:2400.
Although the current data rely heavily on the original soil survey, there have been extensive field checks and alterations to the soil map based on current soil concepts and land use. The data are updated as field site inspections or interpretation changes occur.
Digital data are used to identify the mapping unit potential for a variety of uses, such as agriculture drainfield suitability, construction concerns, or development possibility.
This material is intended for planning purposes, as well as to alert the reader to the broad range of conditions, problems, and use potential for each mapping unit.
The mapping unit potential use rating refers to the overall combination of soil properties and landscape conditions. The information in this data set will enable the user to determine the distribution and extent of various classes of soil and generally, the types of problems which may be anticipated.
HOW NOT TO USE THIS INFORMATION
The information in this guide is NOT intended for use in determining specific use or suitability of soils for a particular site. It is of utmost importance that the reader understand that the information is geared to mapping unit potential and not to specific site suitability. An intensive on-site evaluation should be made to verify the soils map and determine the soil/site suitability for the specific use of a parcel.
The original Soil Survey was written for agricultural purposes, but the emphasis has shifted to include urban/suburban uses. The Revised Soil Survey is currently under technical review and is expected to be published by 2006.
The Interpretive Guide to the Use of Soils Maps; Loudoun County, VA, is available at the Public Information Counter for the Office of Mapping and Geographic Information. It contains more detailed soils information.
Data are stored in the corporate ArcSDE Geodatabase as a polygon feature class. The coordinate system is Virginia State Plane (North), Zone 4501, datum NAD83 HARN.
publication date
These data were generated for use by Loudoun County and are available to the public. These data are intended for use at 1:2400 scale or smaller. Acknowledgement of Loudoun County would be appreciated in products derived from this data. Every reasonable effort has been made to assure the accuracy of these data. Loudoun County, Virginia does not assume any liability arising from the use of these data. These data are provided without warranty of any kind, expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular service. Reliance on these data is at the risk of the user.
1 Harrison St. SE, 2nd Floor
MS 60
Retention of attribute accuracy throughout the coverage to geodatabase feature class conversion process was ensured by a QA/QC programmatic check. To meet satisfactory QA/QC requirements the input coverage and output feature class must have, on a record by record basis, identical attribution when comparing all concatenated fields to all the user-defined attribution.
Topologically Clean
The soils map is continuously being updated based on field site inspections and therefore the soils map merely represents a point in time. Features may have been eliminated or generalized due to scale and intended use. To assist Loudoun County, Virginia in the maintenance of the data, please provide any information concerning discovered errors, omissions, or other discrepancies found in the data.
Retention of coordinate accuracy throughout the coverage to geodatabase feature class conversion process was ensured by a QA/QC programmatic check. To meet satisfactory QA/QC requirements the input coverage and output feature class must have the same record total, and on a record by record basis, area, perimeter and length differential of less than +/- 0.5%.
originated soil mapping units and concepts for agricultural uses in Louodun County
revised soil survey for Loudoun County to emphasize general uses
The Soil Survey of Loudoun County (field work) was conducted between 1947 and 1952 by soil scientists from Virginia Tech and the USDA Soil Conservation Service. Soils were originally shown on 1938 aerial photography at a scale of 4"= -1 mile; soils were later redrafted to a scale of 1" = 1666' (1:20000) for publication in the USDA's Soil Survey of Loudoun County, Virginia, Series 1951, Number 8, which was issued in September 1960. This publication is out of print, and the supply of copies for public distribution has been exhausted. A revision of the soil survey for Loudoun County has been completed. The manuscript is currently undergoing technical review and publication of the final document is anticipated during the 2006 calendar year.
As part of the County's Geographic Information System (G.I.S.) mapping project, the soil survey maps were redrafted onto the County's base maps, at a scale of 1" = 200', then digitized. This information is available at the Office of Mapping and Geographic Information or through the County soil scientist in the Cooperative Extension Office . Although these updated soil maps rely heavily on the original soil survey, changes in both location of mapping unit lines and mapping unit descriptions/interpretations have occurred.
The soils map is continuously being updated based on field site inspections and therefore the soils map merely represents a point in time. Many new soil series concepts have been developed and the emphasis has changed from primarily agricultural use to include urban uses. This report is geared to mapping unit potential for general uses. Mapping unit potential ratings attempt to describe the broad range of conditions found in any given mapping unit for the noted uses. For more site-specific soil interpretations contact the County Soil Scientist in the Department of Building and Development.
This data set was part of a batch process that converted legacy data from ArcInfo coverage in Librarian to a single-tiled ArcInfo coverage in preparation for a final conversion to ArcSDE Geodatabase Feature Classes. Data were extracted from Librarian using the EXTRACT TOPOLOGICAL command.
Multi-tiled data sets were extracted into multiple coverages and then combined based on the feature type(s). Layers with both polygon and arc feature classes were processed with the Arc commands MAPJOIN and DISSOLVE. Arc feature classes alone were processed with the Arc commands, APPEND and DISSOLVE. Layers with both arc and point feature classes and point feature classes alone were processed with the Arc command, APPEND. When used, the arc command, DISSOLVE, was given with the <#all> option.
All coverages were then reprojected to HARN83 using the following .prj file specifications:
INPUT
PROJECTION STATEPLANE
UNITS FEET
ZONE 5551
DATUM NAD27 NADCON
PARAMETERS
OUTPUT
PROJECTION STATEPLANE
UNITS FEET
FIPSZONE 4501
DATUM HPGN NADCON
PARAMETERS END
The dataset was then converted to a feature class in a geodatabase in ArcSDE.
Internal feature number.
ESRI
Soil mapping unit code
Loudoun County
describes grade of land surface or steepness for 2 regions, Eastern & Western Loudoun County
Loudoun County
Source that created or edited feature class
Loudoun County
Not for public distribution. Internal User ID of editor creating or modifying a feature.
Loudoun County
Feature geometry.
ESRI
Feature creation or modification date
Loudoun County
SO_SLOPE: Steep Slopes are defined as any Slope Code = D or E (greater than 15%)
Slope classes in the Blue Ridge (Western Loudoun County) are: A: 0 - 2% NEARLY LEVEL B: 2 - 7% GENTLY SLOPING C: 7 - 15% SLOPING D: 15 - 25% MODERATELY STEEP E: 25% + STEEP Slope classes in the Piedmont (Eastern Loudoun County) are: A: 0 - 3% NEARLY LEVEL B: 3 - 8% GENTLY SLOPING C: 8 - 15% SLOPING D: 15 - 25% MODERATELY STEEP E: 25%+ STEEP
HYDRIC SOILS:
Hydric Soils are those that are wet at or near the ground surface for significant periods of the growing season. Hydric soils are one of the three parameters used to define wetlands. The other two parameters include Hydrology (actual perched or apparent water tables) and vegetation (plants identified to survive only or best in wet areas). This list of Hydric Soils should be used only as a guide since soils maps are not intended for site-specific purposes.
Mapping units that are dominantly Hydric Soils 4A Hatboro loam, 0 to 3 % slopes 6A Bowmansville silt loam, 0 to 3 % slopes 66A Waxpool silt loam, 0 to 3 % slopes 69A Elbert silty clay loam, 0 to 3 % slopes 79A Albano silt loam, 0 to 3 % slopes 99A Kinkora-Delanco complex, 0 to 3 % slopes Mapping units that contain significant inclusions of Hydric Soils 5A Rowland silt loam, 0 to 3 % slopes 10B Mongle loam, 0 to 7 % slopes 12B Rohrersville cobbly loam, 1 to 7 % slopes 63A Kelly silt loam, 0 to 3 % slopes 78A Dulles silt loam, 0 to 3 % slopes 82B Scattersville silt loam, 1 to 7 % slopes 98B Clapham silt loam, 1 to 8 % slopes
SO_SOIL: soil mapping unit code - for more detailed information, see the Interpretive Guide to the Use of Soils Maps; Loudoun County, VA
Unit Code - Description - Slope - additional comment ---- --------------------------- ------------ ---------------------------------- 2A Codorus silt loam, (0-3%) occasional flooding 3A Comus silt loam, (0-3%) occasional flooding 4A Hatboro loam, (0-3%) frequent flooding 5A Rowland silt loam, (0-3%) occasional flooding 6A Bowmansville silt loam, (0-3%)occasional flooding 7A Huntington silt loam, (0-3%) occasional flooding 8A Lindside silt loam, (0-3%) occasional flooding 10B Mongle loam (0-7%) brief ponding 12B Rohrersville cobbly loam, (1-7%) brief ponding 13B Morven silt loam, (1-8%) 14B Manassas silt loam, (1-8%) 17B Middleburg silt loam, (1-7%) 20B Purcellville and Tankerville soils, (2-7%) 20C Purcellville and Tankerville soils, (7-15%) 20D Purcellville and Tankerville soils, (15-25%) 20E Purcellville and Tankerville soils, (25-45%) 23B Purcellville silt loam, (2-7%) 27C Airmont very flaggy loam, (7-15%) 28B Eubanks loam, (2-7%) 28C Eubanks loam, (2-7%) 29B Eubanks loam, stony (2-7%) 29C Eubanks loam, stony (7-15%) 29D Eubanks loam, stony (15-25%) 30C Tankerville and Philomont soils, (7-15%) 30D Tankerville and Philomont soils, (15-25%) 31B Philomont and Tankerville soils, (2-7%) 38B Swampoodle silt loam, (1-7%) brief ponding 40C Catoctin channery silt loam, (7-15%) 40D Catoctin channery silt loam, (15-25%) 40E Catoctin channery silt loam, (25-45%) 43B Myersville-Catoctin Complex, (2-7%) 43C Myersville-Catoctin Complex, (7-15%) 45B Fauquier silt loam, (2-7%) 45C Fauquier silt loam, (7-15%) 50C Stumptown flaggy loam, (7-15%) 50D Stumptown flaggy loam, (15-25%) 51E Stumptown-Rock outcrop complex, (25-45%) 52C Cardiff channery silt loam, (7-15%) 52D Cardiff channery silt loam, (15-25%) 52E Cardiff channery silt loam, (25-45%) 55B Glenelg silt loam, (2-7%) 55C Glenelg silt loam, (7-15%) 55D Glenelg silt loam, (15-25%) 59C Airmont loam, very rubbly (7-15%) 60C Sycoline-Catlett complex, (7-15%) 60D Catlett gravelly silt loam, (15-25%) 60E Catlett-Rock outcrop complex, (25-45%) 62B Kelly- Sycoline complex, (3-8%) 63A Kelly silt loam, (0-3%) 64B Legore loam, (3-8%) 64C Legore loam, (8-15%) 64D Oakhill gravelly silt loam, very stony (15-25%) 65B Montalto silty clay loam, (3-8%) 66A Waxpool silt loam, (0-3%) ponding 67B Haymarket and Jackland soils, (2-8%) 67C Haymarket and Jackland soils, (8-15%) 68B Haymarket and Jackland soils, very stony (2-8%) 68C Haymarket and Jackland soils, very stony (8-15%) 69A Elbert silty clay loam, (0-3%) ponding 70B Leedsville cobbly silt loam, (3-8%) 70C Leedsville cobbly silt loam, (8-15%) 71B Panorama silt loam, (3-8%) 72C Birdsboro loam, (8-15%) 73B Penn silt loam, (3-8%) 73C Penn silt loam, (8-15%) 74B Ashburn silt loam, (1-8%) 76B Sudley-Oatlands complex, (3-8%) 76C Oatlands gravelly silt loam, (8-15%) 76D Oatlands gravelly silt loam, (15-25%) 77C3 Nestoria gravelly silt loam, severely eroded (8-15%) 77D3 Nestoria gravelly silt loam, severely eroded (15-25%) 77E3 Nestoria gravelly silt loam, severely eroded (25-45%) 78A Dulles silt loam, (0-3%) 79A Albano silt loam, (0-3%) brief ponding 80B Brentsville loam, (3-8%) 80C Brentsville loam, (8-15%) 81B Brumbaugh cobbly silt loam, (2-7%) 81C Brumbaugh cobbly silt loam, (7-15%) 82B Scattersville silt loam, (1-7%) brief ponding 83B Braddock cobbly loam, (2-7%) 83C Braddock cobbly loam, (7-15%) 84B Lucketts silt loam, (2-7%) 84C Lucketts silt loam, (7-15%) 88C Lew channery silt loam, stony (7-15%) 88D Lew channery silt loam, stony (15-25%) 89D Weverton very flaggy silt loam, (15-25%) 89E Weverton very flaggy silt loam, (25-45%) 90B Springwood silt loam, (3-8%) 91B Springwood-Rock outcrop complex, (3-8%) 91C Springwood-Rock outcrop complex, (8-15%) 93B Hibler silt loam, (0-5%) rarely flooded 94B Allegheny silt loam, (0-5%) rarely flooded 95B Goresville gravelly silt loam , (0-5%) 98B Captina silt loam, (1-8%) 99A Kinkora-Delanco complex, (0-3%) rarely flooded AIR, Airport DAM, Major Impoundment ISL, Island LDF, Landfill MDL, Made land MPI, Quarry W, Water WAT, Water WATP, Water; Potomac WET, Wet area; Wetland XXW, Water not within the County boundary XXX, Unit not within the County boundary
SO_UPD_SOURCE: Source that created or edited feature class
Source Description 0 Unknown 1 Legacy 2 County 3 Contract
1 Harrison Street, S.E., 2nd Floor
MS 65
Every reasonable effort has been made to assure the accuracy of these data. Loudoun County, Virginia does not assume any liability arising from the use of these data. These data are provided without warranty of any kind, expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular service. Reliance on these data is at the risk of the user.
ESRI Geodatabase Feature Class
ESRI Shapefile
AutoCad Digital Exchange File
Size limit: 4.5 GB. Visit our website at: http://www.loudoun.gov/omagi, click on "Loudoun County Mapping Documents & Order Forms." The "Forms" directory will lead you to custom & standard (countywide) data order forms. Hardcopy maps may also be available; please contact the Mapping Office Public Information Counter for more information regarding all data requests.
1 Harrison Street S.E., 2nd Floor
MS 65