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Definitions


Neighborhood A user defined geographic area around a point of interest. Fairfax county agencies and individuals define neighborhoods differently. Neighborhoods are meant to imply Civic Association, Homeowner Association, or Community Association boundaries. There is not a geographic layer that defines these boundaries.

Views Views are logical groups of information. Currently there are 4 views to choose from: General Information, Parks, Demographics, and Police Incidents. Each view has unique search functions and map types associated with it.

Map Types Each map type has specific layers of information associated with it. As you increase the zoom level, more information relevant to the map type becomes visible.

Search Area The search area allows you to find features based on a number of criteria. Each view has a unique set of searches appropriate for information displayed. In the general information view there are three search options: Address, Street Intersection, and parcel ID number.

Overview Map The overview map shows the location of the main map.The red and grey crosshairs show the location.

Map Legend The Map Legend is used to identify symbols on the main map.Every effort has been made to make sure map contents meet ADA requirements. If you have trouble interpreting any of the maps, please contact gishelpq@fairfaxcounty.gov.

Zoom Bar Use the zoom bar to zoom level of the main map. The + icon will increase the zoom level one bar.The - icon will decrease the zoom level of the main map. You can click on any bar to jump to a specific zoom level. As you increase the zoom level, more layers of information will be drawn in the map area.

Pan Bars Click on any of the cardinal directions (North, South, East, West, NE, NW, SE, SW) listed on the side of the map to move (or pan) the map in that direction.


There are several search options and map types associated with each view. Each is detailed in the appropriate section below.

General Information View
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Address Search:

When selecting the Street Address option the window will appear like the figure above. Enter an address number in the Number field. (Example 12000) In the street name field you may enter all or part of a street name. If you enter part of a street name the search will return multiple results that might match what you are looking for. Finally, select a street type (Optional) If you do not select a type multiple options may be returned. For example if you enter Kerrydale the application will return Kerrydale Dr. and Kerrydale Ct. as valid options. There are optional fields you can use when doing an address search: Unit number, prefix, and suffix. The suffix is especially important when searching for addresses in the Town of Vienna since almost all official addresses include a suffix.

Street List: Selecting any of the letters listed at the bottom of the address search will give you a list of all of the streets that begin with the selected letter. (See Figure on the right) Selecting the "List Addresses" link will give you a list of all addresses on any street.

Property Identification Number (PIN) Search: The PIN number (also known as a tax map reference number) is an alphanumeric string up to 14 characters long that uniquely identifies a parcel.The number has four main sections:

  • Map Book Page (4 digits)
  • Subdivision (2 digits) - also referred to as a "double circle number"
  • Block (2 alphanumeric characters) - not included in some map reference numbers.
  • Parcel or Lot (4 digits and/or 2 alphanumeric characters)

You may enter all or part of a PIN number. If you enter part of a PIN number, search results will be returned for all partial matches. Some examples are:

Entering this data will provide an exact match and zoom the current map to the corresponding parcel.



Entering this data will provide a list of all parcel numbers in Subdivision 15 on map 56-1.


Map Types:

There are 4 maps associated with the General Information View, they are:

General Information This map is best used in conjunction with the "My Neighborhood" report. It shows roads, building footprints, parcels, parks, public facility locations, schools, supervisor district boundaries, jurisdiction boundaries, and water features.

Topographic: This map shows contour and elevation information. The contours represent 5 foot elevation changes in altitude. All spot elevations listed are in feet. The elevation data was derived 1997 from digital orthophotography. For detailed MetaData on the contour data visit the page: http://www.fairfaxcounty.gov/maps/nofind/metadata/contours.htm

Property: The property map includes all of the layers that make up the standard Fairfax County tax map. This is an ideal map to use in conjunction with a PIN search.

Aerial Photography: The aerial photography map shows the 2002 aerial photography provided by the Commonwealth of Virginia. If development has occurred since that time it will NOT be shown on the photos. The resolution (pixel size) of the photography shown is 2ft.

Parks View
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Park Amenity

The park amenity search is a very robust tool that allows you to find parks with one or many features.Selecting the plus icon will expand any major category. You may check as many amenity types as you like when conducting a search. When you check an amenity a green check mark will appear in the box. If you select multiple amenities, the Search must include all of the facilities you selected. If you select two uncommon amenities with this option selected your search may not return any results.

Park Name

The park name search will allow you to find any park by entering all or part of the name.Entering part of the name will return a list of all parks with the search text in the name. For example, entering burke as the search text will return 4 parks: Burke Lake Golf Course, Burke Ride, Burke Station, and Silas Burke parks.

Park List

Click on any letter at the bottom of the search window and the results will show all parks beginning with the selected letter. Use the links in the results window to zoom the map or find specific information about any of the parks listed.

Demographics View
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Address Search:

When selecting the "Street Address" option, the window will appear like the figure above. Enter an address number in the Number field (Example 12000). In the street name field you may enter all or part of a street name. If you enter part of a street name the search will return multiple results that might match what you are looking for. Finally, select a street type (Optional) If you do not select a type multiple options may be returned. For example if you enter Kerrydale the application will return Kerrydale Dr. and Kerrydale Ct. as valid options. There are optional fields you can use when doing an address search: Unit number, prefix, and suffix. The suffix is especially important when searching for addresses in the Town of Vienna since almost all official addresses include a suffix.

Street List: Selecting any of the letters listed at the bottom of the address search will give you a list of all of the streets that begin with the selected letter. (See Figure on the right) Selecting the "List Addresses" link will give you a list of all addresses on any street.

Supervisor District Search: Using the Supervisor District Search will zoom the map to the selected Supervisor District in the Supervisor District drop down box (below the "Search by" option).There are 9 Supervisor Districts in FairfaxCounty: Braddock, Dranesville, Hunter Mill, Lee, Mason, Mount Vernon, Providence, Springfield, and Sully. There is also a Chairman of the Board of Supervisors who represents all districts. To find out what Supervisor District you live in, view the My Neighborhood report for your address in the General Information View.

Map Types

In the Demographics view there are 45 different map types organized in 11 different categories.Below are the major categories and the maps offered in each category.

Age: These maps show age information for the population. The age ranges are: under 5, 5-17, 18-64, and above 64. The figures are produced by the U.S. Census Bureau and the information is displayed by Federal Census Block Group boundaries.

Income and Poverty: These maps show various household income ranges and the percentage of the population above and below the poverty line. There are 4 map types in this category. The figures are produced by the U.S. Census Bureau and the information is displayed by Federal Census Block Group boundaries.

Language Spoken At Home: There are 9 map types in this category that show various languages spoken at home. The languages are: English, Spanish, Indo-European, Asia Pacific, and other. The figures are produced by the U.S. Census Bureau and the information is displayed by Federal Census Block Group boundaries.

Race: There are 5 maps in this category. The race maps include Asian, Black, Hispanic, Other, and White. The figures are produced by the U.S. Census Bureau and the information is displayed by Federal Census Block Group boundaries.

Current Population Estimates Forecasts: The current population forecast maps show the predicted number of residents per federal sub census unit by the year 2010. The current population estimate maps shows a thematic map of the current population estimates. The source for this information is the Fairfax County Department of Human Services Systems Management Division.

Housing Inventory: There are 4 map types in this category: Single Family, Town House, Multi Family and Housing Inventory. The maps show the percentage of each type of category by Federal Census Block Group boundary. The source for this information is the Fairfax County Department of Human Services Systems Management Division.

Median Market Value: There are 3 types of maps in this category: Single Family, Town House, and Condominium. The maps show the market value ranges for each category by Federal Census Tract. The source for this information is the Fairfax County Department of Human Services Systems Management Division.

Housing Age: These Maps show two types of maps: Housing older than 30 years and housing less than 30 years. The maps show the percentage of each type of category. The source for this information is the Fairfax County Department of Human Services Systems Management Division.

Police Incidents View
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Supervisor Districts vs. Police Station Service Areas

HOW ARE THEY DIFFERENT?

Fairfax County Police Station Service Areas, or Police Districts, are defined by the specific district stations that respond to calls within specific boundaries. Fairfax County Supervisor Districts are the areas served by the elected members of the Fairfax County Board of Supervisors. There are nine Supervisor Districts and eight Police Districts. The two can easily be confused because several share the same names even though their boundaries are different.

This map highlights the differences between Police Districts and Supervisor Districts. Police Districts are the bright boundaries, superimposed over a background composed of Supervisor Districts in blue/blue-black. Notice how the area and boundaries of the Mason, Mount Vernon and Sully Police Districts differ from the Supervisor Districts with the same names.


How current is the data?

The Police Incident information displayed on these pages is originally entered in the County's computer aided dispatch system and then processed into format that allows the information to be shown on a map. This process is called geocoding. Generally incident information is available for viewing with 48 hours of the time an incident is reported.

How do incident points get on the map?

The map points that show police incidents are added to the map through a process called geocoding. Geocoding is the process of converting an address to a map coordinate - the address value is taken as a representative fraction for the address range of the given street, based on its length. It is an approximation (not exact) and is meant to be used as a reference. In the example below, 375 Main street is geocoded as 3/4th of the distance from the starting point of the 300 block to the ending point of the 300 block. Because of this process you can not conclude that the police incident shown on the map occurred at the property adjacent to the point shown, but you can conclude that the incident occurred close to the location shown.


Disclaimer
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The geographic information contained on this site is NOT to be construed or used as a "legal description." Every effort has been made to ensure the highest accuracy of all spatial and attribute data, but transcription errors or errors in the source documents can occur. Fairfax County assumes no liability for either any errors, omissions, or inaccuracies in the information provided regardless of their cause, or for any decision made, action taken, or action not taken by the user in reliance upon any maps or information provided. The property lines on the parcel layer have a positional accuracy of 8 to 10 ft. The planimetric features (building outlines, etc.) have a positional accuracy of 2 to 3 ft. Therefore, the imagery and parcels may not have exact alignment. Precise determination of parcel boundaries must be made by a licensed surveyor using the location information recorded on the property deed on file with the Circuit Court. The orthoimagery was taken in 2002. If development has occurred since that time, it will not be shown in the imagery.