| Originator: |
Montgomery County DTS-GIS |
| Publication Date: |
8/3/2001 |
| Title: |
Montgomery County Major County Roads |
| Edition: |
Unknown |
| Presentation Form: |
Vector digital data |
| Publication Place: |
Rockville |
| Publisher: |
Montgomery County Government |
| Other Citation Details: |
None |
| On-line Linkage: |
http://gis.montgomerycountymd.gov/ims/Police/ |
| Requesting Department/Agency: |
DTS-GIS |
| Abstract: |
DTS has been maintaining the County-wide street centerline (i.e. single line) geographic database. It is referred to as GBF/DIME file, a geographic base file created using the dual independent map encoding technology. The Major County Roads are derived from the GBF/DIME file.
GBF/DIME files were first created in the mid-70’s for the metropolitan areas of the country. It was used by the U.S. Census Bureau to assign (geocode) the census questionnaires to their corresponding Census Tracts, Block Groups, and Blocks. During the 1980’s the Census Bureau enhanced and expanded the GBF/DIME system to cover the whole country. The new geographic database system is dubbed as TIGER (Topologically Integrated Geographic Encoding and Referencing) system. Using the Arc/Info GIS software, DTS has also enhanced the County GBF/DIME to a level surpassing TIGER. DTS used the Maryland State Highway Administration’s Grid Map (single line roadway database) as the base to cartographically (and spatially) enhance the coordinate values of the DIME file. Some 44,000 shape points were added to the 41,000 street segment database. The result is a spatially accurate (at 1”=2,000’ scale) and cartographically pleasing street centerlines. (TIGER mapping scale was 1”=8,333’ with lower level of spatial accuracy.) The DTS GIS Team is working on a program to further enhance the coordinate accuracy of the database by using the 1”=200’ roadway centerline files, digital orthophoto images, and other digital engineering drawing files. In addition to end points and (intermediate) shape points recorded for each street segment, the database also carries attributes such as street name and address range for the segment, and the various administrative area code for both sides of the segment. These attributes allow the assignment of geographic units to any data file that has street addresses as one of its data items. |
| Purpose: |
To provide up to date and accurate Major County Roads data for Montgomery County government departments and agencies. |
| Supplemental Information: |
None |
| Begin Date: |
7/21/1999 |
| End Date: |
8/3/2001 |
| Currentness Reference: |
Publication Date |
| Data Status: |
Complete |
| Data Update
Frequency: |
As Needed |
| Geographic Area: |
Montgomery County, Maryland |
| Place Keyword Thesaurus: |
None |
| West Bounding
Coord.: |
-077.5355 |
| East Bounding
Coord.: |
-076.8883 |
| North Bounding
Coord.: |
39.3536 |
| South Bounding
Coord.: |
38.9202 |
| Map Projection: |
Maryland State Plane (NAD83) |
| Map Scale: |
1:24000 |
| Map Units: |
Feet |
| Keyword
Thesaurus: |
None |
| Keywords: |
Roads |
| Access
Constraints: |
Non-Public |
| Data Use
Constraints: |
Acknowledge source: Montgomery County DTS-GIS |
| Browse Graphic File Name: |
http://www.montgomerycountymd.gov/content/gis/images/gallery/gbfdime.gif |
| Browse Graphic Description: |
Montgomery County GBF DIME |
| Browse Graphic File Type: |
GIF |
| Spatial Reference Organization: |
Vector |
| Attribute Overview: |
Please email the DTS-GIS metadata contact for an attribute overview. |
| File Size: |
1,419,198 |
| Data Format: |
ArcInfo Coverage |
| File Decompression Technique: |
ArcInfo Coverage |
| Media Type: |
Network (LAN) |
| Software &
Version: |
ArcInfo 7.2.1 |
| Distributor Contact Organization: |
Montgomery County Government |
| Distributor Contact Person: |
Apollo Teng |
| Distributor Contact Position: |
IT Expert |
| Distributor Address Type: |
Mailing/Physical Address |
| Distributor Address: |
110 N. Washington St., Suite 501 |
| Distributor City: |
Rockville |
| Distributor State: |
Maryland |
| Distributor
Postal Code: |
20850-2204 |
| Distributor Phone: |
240-777-2883 |
| Distributor Fax: |
240-777-2909 |
| Distributor Email: |
apollo.teng@montgomerycountymd.gov |
| Distribution Liability: |
No Liability Assumed by Distributor |
| Distribution Fees: |
$50.00 |
| Metadata
Contact Organization: |
Montgomery County Government |
| Metadata Contact: |
Vicky Kline |
| Address Type: |
Mailing/Physical Address |
| Address: |
110 N. Washington St., Suite 501 |
| City: |
Rockville |
| State: |
Maryland |
| Postal Code: |
20850-2204 |
| Phone: |
240-777-2813 |
| Email: |
vicky.kline@montgomerycountymd.gov |
| Metadata Submittal Date: |
5/1/2002 |
| Metadata Standard Name: |
FGDC Content for Geospatial Metadata |
| Metadata Standard Version: |
FGDC-STD-001-1998 |
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