| Mountainside Development Overlay District (MDOD) of Loudoun County, VA (1999) | |
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Data format: SDE Feature Class File or table name: GISDBB.GISBROW.MTNSIDE_POLY Coordinate system: Lambert Conformal Conic Theme keywords: boundaries, elevation, environment, mountainside, critical elevation, soil, slippage, groundwater recharge, forest cover, slope, sensitivity, zoning, overlay, district, planning |
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Abstract:
MDOD Metadata/Map Disclaimer
The Circuit Court of Loudoun County issued an opinion dated March 30, 2004 ruling that this Mountainside Development Overlay District (MDOD) is void. The 1993 Mountainside Development Overlay District (MDOD) regulations in effect prior to adoption of the revised 2003 MDOD on January 6, 2003, will apply in the administration of zoning regulations. The March 30, 2004 decision may be the subject of an appeal.</p>
The Mountainside Development Overlay District is a zoning overlay district administered by the Department of Building and Development. Mountainside classifications are based upon the following criteria: critical elevation, soils, slope, and forest values. Critical elevation areas are determined from the County's digital topography, soil and slope values are based upon data the County's soil layer, and forested areas are based upon the digital forest data. For more information consult the metadata for those layers. |
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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.
MDOD Metadata/Map Disclaimer The Circuit Court of Loudoun County issued an opinion dated March 30, 2004 ruling that this Mountainside Development Overlay District (MDOD) is void. The 1993 Mountainside Development Overlay District (MDOD) regulations in effect prior to adoption of the revised 2003 MDOD on January 6, 2003, will apply in the administration of zoning regulations. The March 30, 2004 decision may be the subject of an appeal.</p> The Mountainside Development Overlay District is a zoning overlay district administered by the Department of Building and Development. Mountainside classifications are based upon the following criteria: critical elevation, soils, slope, and forest values. Critical elevation areas are determined from the County's digital topography, soil and slope values are based upon data the County's soil layer, and forested areas are based upon the digital forest data. For more information consult the metadata for those layers.
The Mountainside Development Overlay District is a zoning overlay district (see Section 4-1600 of the 1993 Loudoun County Zoning Ordinance) and regulates development on the mountainside of the County. Mountainside data should be used for general planning purposes only and is not intended for use in delineating specific use or suitability of soils for a particular site. Areas prone to debris flow (slippage) may not be accurately delineated. The Department of Building and Development is responsible for final clearance and interpretation on zoning/building permits and land development applications for the Mountainside Development Overlay District.
Mountainside classifications are based upon the Mountainside Development Overlay District Soils Worksheet available from the Office of Mapping and Geographic Information or the County's soil scientist in the Department of Building and Development. Mountainside classifications are based upon the mside_val item. A mside_val score of 9 is Moderately Sensitive, scores of 10-13 are Sensitive, and scores of 14 or greater are Highly Sensitive. The digital mountainside data was compiled in 1999 and has not since been updated. The mountainside data does not reflect changes made to forests, soils, slopes, and topography since 1999. The current mountainside criteria as outlined on the worksheet came into effect in 1991. 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, US Feet.
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
Mountainside data is based upon digital topography, soils, and forests available in 1999. Mountainside boundaries may be modified as part of any Comprehensive Plan rewrite. 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%.
overlay of elevation, soils and forest established MDOD
Data was extracted from pctbase.topo in 1999 and edited to form polygons and coded as above or below the critical elevation. Polygon topographic data was unioned with polygon data extracted from environment.soils and environment.forest in 1999. The elev_val, forest_val, and soil_val items were populated with appropriate values from lookup tables and were then summed to determine the mountainside score (mside_val).
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.
Critical elevation component value. Identifies if area is above or below.
Loudoun County
Forest component value. Identifies if area is forested or not.
Loudoun County
Soil component value of area based on groundwater recharge, slippage, slope, and whether it is a mountain soil. (see the Mountainside Development Overlay District Soils Worksheet for sub-totals of specific soil mapping units).
Loudoun County
Sum of MT_ELEV_VAL, MT_FOREST_VAL, and MT_SOIL_VAL, which is the overall sensitivity of the moutntainside area.
Loudoun County
Source that created or edited feature class
Loudoun County
Feature creation or modification date
Loudoun County
Not for public distribution. Internal User ID of editor creating or modifying a feature.
Loudoun County
Feature geometry.
ESRI
Internal feature number.
ESRI
MT_ELEV_VAL: Value that identifies if area is above or below critical elevation component value. Critical elevation for the Catoctin Ridge is 550 feet, critical elevation for Short Hill and the Blue Ridge is 700 feet.
Value Definition 0 Below critical elevation 3 Above critical elevation
MT_FOREST_VAL: Value that identifies if area is forested or not.
Value Defination 0 Not forested 2 Forested
MT_MSIDE_VAL: Sum of MT_ELEV_VAL, MT_FOREST_VAL, and MT_SOIL_VAL, which is the overall sensitivity of the mountainside area. Mountainside consists of all polygons with scores of 9 or above.
Value Sensitivity 0 Non-mountainside 9 Moderately Sensitive 10 Sensitive 11 Sensitive 12 Sensitive 13 Sensitive 14 Highly Sensitive 15 Highly Sensitive 16 Highly Sensitive 17 Highly Sensitive 18 Highly Sensitive 19 Highly Sensitive 21 Highly Sensitive 23 Highly Sensitive
MT_UPD_SOURCE: Source that created or edited feature class
Source Definition 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.
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