King County Image/Raster User Tiling Index - idxptrmbr

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: King County

Publication_Date: 200307

Title: King County Image/Raster User Tiling Index - idxptrmbr

Edition: One

Geospatial_Data_Presentation_Form: Vector Digital Data

Publication_Information:

Publication_Place: King County, WA

Publisher: King County

Other_Citation_Details: None

Online_Linkage: None

Description:

Abstract:

A spatial tiling index designed for storage of file-based image and other raster (i.e., LiDAR elevation, landcover) data sets. An irregular grid of overlapping polygons, each enclosing its respective Public Land Survey System (PLSS) township in an orthogonal polygon minimally encompassing all portions of that township, i.e., minimum bounding rectangle. The amount of overlap between adjacent tiles varies depending on the geometry of the underlying township.

Currently extended to include all townships within or partially within King County as well as those townships in the southwestern portion of Snohomish County included within King County's ESA/SAO project area.

The name of the spatial index is derived from the acronym (I)n(D)e(X) (P)olygons for (T)ownship-(R)ange, (M)inimum (B)ounding (R)ectangle, or idxptrmbr.

Tile label is the t(township number)r(range number)as in t24r02. The meridian zone identifiers, N for townships and E for range is inferred as this index is intended as a local index for ease of use by the majority of users of GIS data. Lowercase identifiers are used for consistency between Unix and Windows OS storage.

This index or tile level is the primary user-access level for most LiDAR elevation, orthoimagery and high-resolution raster landcover data. However, not all image and raster data is stored at the tiling level if a given data's resolution does not justify storing the data as multiple tiles.

Purpose:

This index is the primary User Access level for image/raster datasets. It provides multiple file-based data sets to be accessed at full or near full resolution in a common, consistent tile and naming scheme.

The index also serves as a useful central reference scheme for identification of real-world locations as it references the commonly used township-range grid of the PLSS.

As each cell is defined with orthogonal edges relative the Washington State Plane coordinate system, and is defined by easting and northing bounds rounded to the nearest 100 foot, it accomodates most common pixel resolutions of multiple Ground Sample Distance without partial pixel effects and without zero or NULL data 'splinters'.

Supplemental_Information:

This spatial index is one of three index or tiling levels used to store King County image and raster data. The index level lower than this is the idxp7500 index. The index level immediately higher than this is idxpzone. Each higher index level is designed to build upon the lower levels, with the same data often stored at more than one level (though at different resolutions) to meet a range of business and software requirements.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 200301

Ending_Date: 200307

Currentness_Reference: Publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Description_of_Geographic_Extent:

The PSLC project area in combination with the King County ESA/SAO Project area comprise
the entirety of King County and southwestern Snohomish County (WRIA 8). The PSLC portion
encompasses approximately 500 square miles, including Vashon Island, the Seattle urban
environs, and mid-central King County. The ESA/SAO portion, approximately 1800 square miles,
includes the remainder of King County and the Snohomish portion.

Bounding_Coordinates:

West_Bounding_Coordinate: -121.500000

East_Bounding_Coordinate: -121.100000

North_Bounding_Coordinate: +47.800000

South_Bounding_Coordinate: +47.100000

Keywords:

Theme:

Theme_Keyword_Thesaurus: Not applicable

Theme_Keyword: Image data

Theme_Keyword: Raster data

Theme_Keyword: Spatial index

Theme_Keyword: Tiling Index

Theme_Keyword: PLSS

Theme_Keyword: Public Land Survey System

Theme_Keyword: Township/Range

Place:

Place_Keyword_Thesaurus: Not applicable

Place_Keyword: King County, WA

Place_Keyword: Pacific NW

Place_Keyword: Washington state

Place_Keyword: Seattle

Place_Keyword: Snohomish County, southwestern portion

Access_Constraints: None

Use_Constraints: None

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Michael Leathers

Contact_Organization:

King County Geographic Information Center, Department of Natural Resources and Parks

Contact_Position: GIS Data Coordinator

Contact_Address:

Address_Type: Mailing and physical address

Address: 201 S Jackson St, Suite 706

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Country: USA

Contact_Voice_Telephone: 206-263-4867

Native_Data_Set_Environment:

ArcInfo, ArcView and any other software that can read ESRI shapefile format on Windows or Unix. Index is available only in shapefile format.

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Identifiers for each cell are unique and reference the underlying township/range that encompasses.

Logical_Consistency_Report:

All cells have a label attribute. The half-townships in eastern King County are included in the tile of full township of the same name, i.e., t24.5sr11e is included in the t24r11 tile.

Completeness_Report:

The index currently covers the King County and southwestern Snohomish County areas currently involved in several related image/raster data acquisition projects. The extent has been buffered to encompass some adjoining areas. Those tiles at the edge of the current data project area are defined to their full township extent to allow appending subsequent townships if necessary.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The bounds of each cell were generated from State Plane easting and northing coordinate values defined by a minimum bounding rectangle interpretation of the township extent. Overlap with adjacent tiles was provided to ensure sufficient data buffers. The interpreted bounds were rounded up the next nearest 100 foot easting and northing value.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: King County

Publication_Date: 2003

Title: King County ESA/SAO Data Acquisition project

Geospatial_Data_Presentation_Form: Vector digital data

Publication_Information:

Publication_Place: King County, WA

Publisher: King County

Other_Citation_Details:

This index was developed jointly between the King County Dept of Transportation Roads Maintenance Dept and the King County GIS Center

Type_of_Source_Media: Not Applicable

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 012003

Ending_Date: 072003

Source_Currentness_Reference: Publication date

Source_Citation_Abbreviation: ESA/SAO

Source_Contribution:

A common data storage mechanism for file-based image/raster data in a compressed format or at reduced resolution.

Process_Step:

Process_Description:

Heads up digitizing was used to create minimum-bounding rectangles around each township in the project area. This portion included the subjective interpretation of the amount of buffer to include in each tile. This was performed in a CAD-based software package called VROne

Process_Date: 032002

Process_Step:

Process_Description:

The minimum and maximum bounds were captured in a Microsoft Excel spreadsheet where the bounds were rounded to the next highest 100 foot easting and northing increment.

Process_Date: 052002

Process_Step:

Process_Description:

The spreadsheet was converted to a text file which was used in an ArcInfo AML to create individual shapefile polygons for each township tile. The shapefiles were merged in ArcView to a composite shapefile. Final attributes, including min and max bounds and identifiers were appended from a text file converted to a dbf.

Process_Date: 200302

Process_Step:

Process_Description:

Some of the township tile bounds along the edges of the King County were not described to the true extent of the township but rather to the extent of the data available from the data projects. To standardize the extents of all tiles and to ensure that subsequent tiles could be appended, any partial townships were regenerated. The Excel spreadsheet was updated to reflect the new bounds, new tiles generated and the composite index shapefile was updated.

Process_Date: 062003

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference:

The grid defined by this index is a regular grid that does not have any additional or indirect spatial reference beyond referencing the extent of the underlying township.

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Ring composed of arcs

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: Washington, North

Lambert_Conformal_Conic:

Standard_Parallel: 47.500000

Standard_Parallel: 48.733333

Longitude_of_Central_Meridian: -120.833333

Latitude_of_Projection_Origin: 47.000000

False_Easting: 1640416.666500

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: Row and column

Coordinate_Representation:

Abscissa_Resolution: 1

Ordinate_Resolution: 1

Planar_Distance_Units: Survey feet

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983, 1991 Adjustment (HPGN)

Ellipsoid_Name: GRS 80

Semi-major_Axis: 20925604.4720406

Denominator_of_Flattening_Ratio: 298.26

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Shapefile dbf attribute file

Entity_Type_Definition: Index cell identifier and descriptive attributes

Entity_Type_Definition_Source: Software assigned and user indexed

Attribute:

Attribute_Label: mbr_id

Attribute_Definition:

Unique integer identifier for each tile composed the township number cocantenated with the range number, i.e. the identifier for township 22, range 12 would be 2212, the identifier for township 22, range 03 would be 2203.

Attribute_Definition_Source: User-defined

Attribute_Domain_Values:

Unrepresentable_Domain:

Unique integer comprised of two-digit township integer cocantenated with two-digit (left-padded with zero where necessary) range number.

Attribute:

Attribute_Label: mbr_abb

Attribute_Definition:

Unique alphanumeric identifier for each cell comprised of township number prefaced with 'T' cocantenated with range number (left-padded with zero, where necessary) prefaced with a 'R'.

Attribute_Definition_Source: User-defined

Attribute_Domain_Values:

Unrepresentable_Domain: Alphanumeric code

AA04, AA05, BB12, BC16, etc.

Attribute:

Attribute_Label: mbr_abblc

Attribute_Definition:

Same alphanumeric township-range identifier found in mbr_abb item but with lowercase t and r, indicating township and range, respectively.

Attribute_Definition_Source: User-defined

Attribute_Domain_Values:

Unrepresentable_Domain: Unique alphanumeric code

Attribute:

Attribute_Label: mbr_twn

Attribute_Definition: Two-character alpha code for township number.

Attribute_Definition_Source: User-defined

Attribute_Domain_Values:

Unrepresentable_Domain: Alpha expression of township number

Attribute:

Attribute_Label: mbr_range

Attribute_Definition: Two-character alpha code for township number.

Attribute_Definition_Source: User-defined

Attribute_Domain_Values:

Unrepresentable_Domain:

Alpha expression of Range number. Left-padded with zero where necessary.

Attribute:

Attribute_Label: xmin

Attribute_Definition: Minimum State Plane easting value for tile bound.

Attribute_Definition_Source: User-defined

Attribute_Domain_Values:

Unrepresentable_Domain: Seven digit integer

Attribute:

Attribute_Label: ymin

Attribute_Definition: Minimum State Plane northing value for tile bound.

Attribute_Definition_Source: User-defined

Attribute_Domain_Values:

Unrepresentable_Domain: Six-digit integer

Attribute:

Attribute_Label: xmax

Attribute_Definition: Maximum State Plane easting value for tile bound.

Attribute_Definition_Source: user-defined

Attribute_Domain_Values:

Unrepresentable_Domain: Seven-digit integer

Attribute:

Attribute_Label: ymax

Attribute_Definition: Maximum State Plane northing value for tile bound.

Attribute_Definition_Source: User-defined

Attribute_Domain_Values:

Unrepresentable_Domain: Six-digit integer

Overview_Description:

Entity_and_Attribute_Overview:

All tiles are identified with a several attributes that indicate the tile-id, its bounding coordinates and the township-range represented. As the shapefile serves primarily as a spatial index,the mbr_abb and mbr_abblc are the primary attributes needed to correctly reference and describe the location of the cell tile.

Entity_and_Attribute_Detail_Citation: None

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Dennis Higgins

Contact_Organization:

King County GIS Center, Client Services, Department of Natural Resources and Parks

Contact_Position: Manager, Client Services Division

Contact_Address:

Address_Type: Mailing and physical address

Address: 201 S Jackson St, Suite 706

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Country: USA

Contact_Voice_Telephone: 206-263-4523

Resource_Description: Image/Raster data User spatial index, idxtrmbr.shp

Distribution_Liability:

King County disclaims any warranty of use of any digital product or data beyond that for which it was designed.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ArcInfo Shapefile

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: \\gisdw\kclib\plibrary3\reference\indexes

Offline_Option:

Offline_Media: CD-R, DVD+R

Recording_Format: CD: Read-only, DVD: DVD+R read-only

Fees:

Contact KCGIS Client Services <http://www.metrokc.gov/gis/services/> for cost of reproduction and delivery

Metadata_Reference_Information:

Metadata_Date: 20030715

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Michael Leathers

Contact_Organization:

King County GIS Center Department of Natural Resources and Parks

Contact_Position: GIS Data Coordinator

Contact_Address:

Address_Type: Mailing and physical address

Address: 201 S Jackson St, Suite 706

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Country: USA

Contact_Voice_Telephone: 206-263-4863

Contact_Electronic_Mail_Address: mike.leathers@metrokc.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998