DCGIS.ImperviousSurfacePly

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Office of the Chief Technology Officer
Publication_Date: 20101101
Title: DCGIS.ImperviousSurfacePly
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publisher: DC GIS
Larger_Work_Citation:
Citation_Information:
Originator: DC GIS
Title: DC Geographic Information System
Geospatial_Data_Presentation_Form: vector digital data
Description:
Abstract:
Impervious Surfaces. The dataset contains planimetric features that are typically classified as impervious surface., created as part of the DC Geographic Information System (DC GIS) for the D.C. Office of the Chief Technology Officer (OCTO) and participating D.C. government agencies. The dataset is dervided from the 2005 Planimetric Datasets
All DC GIS data is stored and exported in Maryland State Plane coordinates NAD 83 meters.
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.
Supplemental_Information:
Impervious Surfaces include:
Airport Taxiways, Helipads, Outdoor Building Stairs, Buildings, Sidewalks, Roads, Alleys, Driveways, and Swimming Pools.
All of which can be found in the 2005 Planimetrics.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20101101
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -77.117647
East_Bounding_Coordinate: -76.909327
North_Bounding_Coordinate: 38.995671
South_Bounding_Coordinate: 38.804312
Data_Set_G-Polygon:
Data_Set_G-Polygon_Outer_G-Ring:
G-Ring_Point:
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: environment
Theme_Keyword: Flood
Theme_Keyword: Runoff
Theme_Keyword: Impervious
Theme_Keyword: Hydrography
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_Organization_Primary:
Contact_Organization: Office of the Chief Technology Officer
Contact_Position: GIS Data Coordinator
Contact_Address:
Address_Type: mailing and physical address
Address: 441 4th Street NW, Suite 930 South
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: 8:30am - 5:30pm
Data_Set_Credit: Office of the Chief Technology Officer
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.6.1500
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Dataset believed to be complete and accurate, subject to change.
Logical_Consistency_Report: In process of validation by source and/or responsible agency.
Completeness_Report: Data believed to be complete and accurate, subject to change.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
1 foot accuracy since derived from the 1:1200 scale planimetrics.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: N/A
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Office of the Chief Technology Officer
Publication_Date: 2005
Title: Geographic Information Systems
Geospatial_Data_Presentation_Form: vector digital data
Online_Linkage: <http://dcgis.dc.gov>
Type_of_Source_Media: database
Source_Citation_Abbreviation: DC GIS 2005 Planimetrics
Process_Step:
Process_Description:
2008 Planimetrics Datasets were exported into a separate workspace along with the DC Boundary feature class. The Planimetrics feature classes used were: Buildings Roads Sidewalks Structures Airports Swimming Pools
While most of the planimetrics came from the 2005 basemap update, several layers such as pools and airports are from 1999.
The final product is essentially all the interested Planimetric surfaces clipped out of the DC Boundary all at once. The Large Overlay Tools, specifically Large Clip, do not work properly within ArcGIS 9.2. The layer still has about 5 separate records within the attribute table. Because of how the Large Clip tool works (partitioning), this is unavoidable.
The final output is a merged data layer of several planimetric datasets that include airports, buildings, pools, roads, sidewalks, and stairs. The datasets were processed with ESRI's ArcGIS Desktop and ArcInfo Workstation software.
Each dataset was exported from a central database as a coverage. A new attribute field was added to each coverage and the records of impervious polygons were populated with a common value (i.e. Dissolve1 = 1) to prep the data for use with the DISSOLVE command in ArcInfo Workstation. The DISSOLVE command was run on each coverage using the new attribute field as the dissolve field. Note: Previous attempts using ArcToolbox's Dissolve tool resulted in memory errors. The UNION command was iterated against each dissolved coverage to produce a final output coverage.
The "union" output coverage was divided up by ward using the SPLIT command to avoid memory errors in ArcToolbox. . A new attribute field was added to each coverage and the records of impervious polygons were populated with a common value. The ArcToolbox Dissolve tool was run on each ward coverage and output as a multipart polygon shapefile. The dissolved ward shapefiles were merged into one polygon shapefile and imported into a database using a definition query to only import records defined as impervious. The final output is an eight record multipart polygon. Due to memory errors and final dissolve command could not be completed.
Large Overlay Tools DO NOT work properly with ArcGIS 9.2 because of a glitch. The analyst should research in the future to see if this has been resolved.
Process_Date: 20091231
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: 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: 8:30am - 5:30pm
Process_Step:
Process_Description:
Using a 200 x 200 meter polygonal sample grid, an Intersect process was performed on the original Impervious Surfaces layer. The purpose of this process was to break up the 8 highly complex large features into a thousands of more manageable chunks. The tolerance was set to .001 meter.
Process_Date: 20100518
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: OCTO
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 4500
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: State Plane Coordinate System
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_Resolution: 1.000000
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: DCGIS.ImperviousSurfacePly
Entity_Type_Definition: Impervious Surfaces
Entity_Type_Definition_Source: OCTO
Attribute:
Attribute_Label: SHAPE
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
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: SHAPE.AREA
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: 20101102
Metadata_Review_Date: 12/12/06
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_Voice_Telephone:
REQUIRED: The telephone number by which individuals can speak to the organization or individual.
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
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 14:49:13 2015