Break Lines

Metadata also available as

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Office of the Chief Technology Officer
Publication_Date: 20091202
Title: Break Lines
Edition: 1st Edition
Geospatial_Data_Presentation_Form: vector digital data
Online_Linkage:
Server=10.1.11.144; Service=5151; User=dcgis; Version=SDE.DEFAULT
Larger_Work_Citation:
Citation_Information:
Originator: DC GIS
Title: DC Geographic Information System
Geospatial_Data_Presentation_Form: vector digital data
Description:
Abstract:
Breaklines. The dataset contains breakline features derived photogrammetrically to support 2’ contours. Masspoints and breaklines were compiled from Spring 2008 aerial photography using softcopy photogrammetric techniques. Breaklines typically occur at significant terrain breaks including street centerlines, hydrography, road edges, rail centerlines, and walls.
Masspoints and breaklines were compiled to support generation of a TIN and the subsequent processing of 2’ contours. All DC GIS data is stored and exported in Maryland State Plane coordinates NAD 83 meters for horizontal locations. METADATA CONTENT IS IN PROCESS OF VALIDATION AND SUBJECT TO CHANGE.
Purpose:
This data is used for the planning and management of Washington, D.C. by local government agencies.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20080528
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -77.119895
East_Bounding_Coordinate: -76.909320
North_Bounding_Coordinate: 38.995534
South_Bounding_Coordinate: 38.790447
Data_Set_G-Polygon:
Data_Set_G-Polygon_Outer_G-Ring:
G-Ring_Point:
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: Terrain
Theme_Keyword: elevation
Theme_Keyword: topography
Theme_Keyword: contour
Theme_Keyword: breakline
Place:
Place_Keyword: Washington, D.C.
Place_Keyword: District of Columbia
Place_Keyword: DC
Place_Keyword: DC GIS
Place_Keyword: DCGIS
Use_Constraints:
For data terms and conditions, go to <http://dc.gov/page/terms-and-conditions-use-district-data>
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: GIS Data Coordinator
Contact_Organization: DC Office of the Chief Technology Officer (OCTO)
Contact_Address:
Address_Type: mailing and physical address
Address: 801 7th Street SW
City: Washington DC
Postal_Code: 20024
Country: USA
Contact_Voice_Telephone: (202) 727-5660
Contact_Electronic_Mail_Address: [email protected]
Hours_of_Service: 8:30 am - 5:00 pm
Data_Set_Credit: Office of the Chief Technology Officer
Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 9.2.6.1500
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: Validated by source and/or responsible agency.
Logical_Consistency_Report:
Validated by KCI Technologies, Inc. and OCTO. OCTO developed and operated a QA/QC program to check the deliverables. Generally, the program consists of various types of processes grouped into visual checks, automated procedures, edge-matching routines, and specialized checks. Staff identified issues in a shapfile with appropriate descriptions for the vendor to fix. The data was delivered in preliminary format for a thorough review and identification of issues. The vendor fixed the data and delivered final data which OCTO checked to ensure the vendor made the fixes appropriately.
Completeness_Report:
Data believed to be complete and accurate, subject to change. Validated by responsible agency
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal Accuracy data points is in accordance with ASPRS Class I Accuracy standards for 1"=100' scale mapping.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
This data has been tested in accordance with the NSSDA Spatial Data Standards. Fifty-seven (57) checkpoints were used in the evaluation. Checkpoints were derived from multiple sources including: 1) KCI surveyed independent checkpoints, 2) Checkpoints/GCPs used for a previous mapping program (14th street bridge), 3) Survey control withheld from the final aerial triangulation solution All of these tests were based on a final Airborne GPS, AT, and DTM. As a result the data has been found to have a vertical RMSE of 1.0ft. At the 95% confidence level this is 2.0ft. This data has been found to meet ASPRS Class 1.5 Accuracy Standards. In comparison to National Map Accuracy Standards where 90% of the checkpoints should be within 1’ our findings indicate 86% of the well defined points are within 1’ and the remaining 93% are within 2’. Any accuracy limitations were primarily impacted by flying height, image resolution, and lack of sidelap in specific areas which impacts the overall block adjustment.
The breakline and masspoints are good for planning purposes but should not be used for precise engineering and survey work at the ASPRS class 1 accuracy standard level.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:
<The name of the organization or individual that developed the source.>
Publication_Date:
<The publication date of the source. This is formatted to "dd/mm/yyyy.">
Title: <The title or descriptor of the source.>
Online_Linkage: <The online web url for the source originator or document.>
Type_of_Source_Media: filmstrip
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20080525
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: aerial photography
Source_Contribution:
New aerial photography was collected in the Spring of 2008 to support new orthoimagery and planimetric updates. This aerial photography was composed of approximately 52 flight lines and a total of 1552 exposures.. The mission was flown with one Vecxel Ultracam X camera and collected ABGPS and IMU for each exposure.
Process_Step:
Process_Description:
New DTM data was compiled based on 2008 aerial photography and was used to support 2’ contour production. The photogrammetrically compiled masspoints and breaklines were created using ZI Imaging softcopy photogrammetric workstations. Masspoints were created at an approximate 75-100’ spacing and breaklines were captured for major transportation features (roads, bridges, paved parking areas) and major water features (streams, lakes, and rivers). The completed DTM dataset, having already been checked for accuracy, was used to generate contours. The DTM data has been attributed with its elevation. Masspoints and breaklines were exported to ESRI geodatabase format for delivery to DC OCTO and KCI.
Source_Used_Citation_Abbreviation: C:\OCTOGIS\Data\Metadata\TemplateDCStat
Process_Date: 20090901
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Shawn Benham
Contact_Organization: Sanborn Map Company
Contact_Position: Project Manager
Contact_Address:
Address_Type: mailing and physical address
Address: 200 I Street SE, 5th Floor
City: Colorado Springs
State_or_Province: Colorado
Postal_Code: 80920
Country: USA
Contact_Voice_Telephone: (719) 502-1296
Contact_Electronic_Mail_Address: [email protected]
Hours_of_Service: <The hours of service of the process point of contact.>
Process_Step:
Process_Description: Metadata imported.
Source_Used_Citation_Abbreviation: E:\DCGISDATA_WORKSPACE\Metadata\TemplateDCGIS.shp.xml
Process_Step:
Process_Description: Metadata imported.
Source_Used_Citation_Abbreviation: V:\DataLoad\DTM_Breakline Metadata_DCGIS.shp.xml
Process_Step:
Process_Description: Dataset copied.
Source_Used_Citation_Abbreviation: Service=sde:oracle10g; User=dcgis_user; Version=SDE.DEFAULT
Process_Date: 20100331
Process_Time: 11290500
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 0
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: State Plane Coordinate System 1983
State_Plane_Coordinate_System:
SPCS_Zone_Identifier: 1900
Lambert_Conformal_Conic:
Standard_Parallel: 38.300000
Standard_Parallel: 39.450000
Longitude_of_Central_Meridian: -77.000000
Latitude_of_Projection_Origin: 37.666667
False_Easting: 400000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000063
Ordinate_Resolution: 0.000063
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 0.250000
Altitude_Distance_Units: feet
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: DCGIS.BreaklineLn
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: OBJECTID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: GIS_ID
Attribute_Definition: OCTO GIS sequential identifier
Attribute:
Attribute_Label: FEATURECODE
Attribute_Definition: Feature Code
Attribute:
Attribute_Label: DESCRIPTION
Attribute_Definition: Feature description
Attribute:
Attribute_Label: CAPTUREACTION
Attribute_Definition: capture action of feature
Attribute:
Attribute_Label: SHAPE
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: CAPTUREYEAR
Attribute_Definition: Capture date of feature
Attribute:
Attribute_Label: SHAPE.LEN
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: DC Office of the Chief Technology Officer
Contact_Person: GIS Data Coordinator
Contact_Address:
Address_Type: mailing and physical address
Address: 200 I Street SE, 5th Floor
City: Washington
State_or_Province: DC
Postal_Code: 20001
Country: USA
Contact_Facsimile_Telephone: (202) 727-5660
Contact_Electronic_Mail_Address: [email protected]
Hours_of_Service: 8:30 am - 5:30 pm
Resource_Description: Downloadable Data
Distribution_Liability:
For data terms and conditions, go to <http://dc.gov/page/terms-and-conditions-use-district-data>
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 0.040
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Ordering_Instructions: All data is available at <http://opendata.dc.gov>
Metadata_Reference_Information:
Metadata_Date: 20100402
Metadata_Review_Date: <publication date - format dd/mm/yyyy>
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: D.C. Office of the Chief Technology Officer
Contact_Person: GIS Data Coordinator
Contact_Address:
Address_Type: mailing and physical address
Address: 200 I Street SE, 5th Floor
City: Washington
State_or_Province: DC
Postal_Code: 20001
Country: USA
Contact_Facsimile_Telephone: (202) 727-5660
Contact_Electronic_Mail_Address: [email protected]
Hours_of_Service: 8:30 am - 5 pm
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.9.12 on Thu Jun 25 15:26:34 2015