IDXPTRMBR - Township Tiling Index for King County Raster Data

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: 20030701

Title: IDXPTRMBR - Township Tiling Index for King County Raster Data

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: <http://www5.kingcounty.gov/gisdataportal/Default.aspx>

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. Individual shapefiles for each of the cells in this index are available in gisimage/images/reference/indexes/idxptrmbr_shp as 'tileabb'mbr.shp.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20030701

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -122.653761

East_Bounding_Coordinate: -120.922772

North_Bounding_Coordinate: 48.054413

South_Bounding_Coordinate: 46.977576

Keywords:

Theme:

Theme_Keyword_Thesaurus: Not applicable

Theme_Keyword: reference grids

Theme_Keyword: survey

Theme_Keyword: Image data

Theme_Keyword: Raster data

Theme_Keyword: PLSS

Theme_Keyword: Spatial Index

Theme_Keyword: Township and Range

Theme_Keyword: Public Land Survey System

Theme_Keyword: Tiling index

Place:

Place_Keyword_Thesaurus: Not applicable

Place_Keyword: Snohomish County; southwestern portion

Place_Keyword: Seattle

Place_Keyword: Washington state

Place_Keyword: Pacific NW

Place_Keyword: King County

Place_Keyword: WA

Access_Constraints: None

Use_Constraints:

King County data are made available with the understanding that they shall be used exclusively by the obtainer or his/her authorized agents. Digital products may not be reproduced or redistributed in any form or by any means without the express written authorization of King County.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: King County GIS Center

Contact_Person: Victor High

Contact_Position: Senior GIS Specialist

Contact_Address:

Address_Type: mailing and physical

Address: 201 S Jackson St, Suite 706

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Country: US

Contact_Voice_Telephone: 206-263-4845

Browse_Graphic:

Browse_Graphic_File_Name: <http://www5.kingcounty.gov/sdc/DataImages/idxptrmbr.jpg>

Browse_Graphic_File_Description:

JPG File of layer overlain on base of WA counties or local cities

Browse_Graphic_File_Type: JPG

Native_Data_Set_Environment:

Microsoft Windows Server 2008 R2 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcGIS 10.0.0.2414

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:

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: 20020301

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: 20020501

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: 20030201

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: 20030601

Process_Step:

Process_Description:

To accomodate the larger extents of newer imagery acquisition projects, additional township tiles were appended to all edges of the grid, resulting in a final grid that covers all directions equally.

Process_Date: 20100301

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference:

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.

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains

Point_and_Vector_Object_Count: 0

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet

Lambert_Conformal_Conic:

Standard_Parallel: 47.5

Standard_Parallel: 48.73333333333333

Longitude_of_Central_Meridian: -120.8333333333333

Latitude_of_Projection_Origin: 47.0

False_Easting: 1640416.666666667

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.00025

Ordinate_Resolution: 0.00025

Planar_Distance_Units: foot_us

Geodetic_Model:

Horizontal_Datum_Name: D North American 1983 HARN

Ellipsoid_Name: GRS 1980

Semi-major_Axis: 6378137.0

Denominator_of_Flattening_Ratio: 298.257222101

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: PLIBRARY.SURVEY.xxxx218439

Entity_Type_Definition: Polygon attribute table

Entity_Type_Definition_Source: ESRI

Attribute:

Attribute_Label: SHAPE

Attribute_Definition: Feature Geometry

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features

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: King County

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: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1

Range_Domain_Maximum: 143

Attribute_Measurement_Resolution: 1

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

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: King County

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_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: King County

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: King County

Attribute_Domain_Values:

Unrepresentable_Domain: Alpha expression of township number

Attribute:

Attribute_Label: MBR_RGE

Attribute_Definition: Two-character alpha code for township number.

Attribute_Definition_Source: King County

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: King County

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0

Range_Domain_Maximum: 1582589

Attribute_Units_of_Measure: Feet

Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: YMIN

Attribute_Definition: Minimum State Plane northing value for tile bound.

Attribute_Definition_Source: King County

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -3019

Range_Domain_Maximum: 318653

Attribute_Units_of_Measure: Feet

Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: XMAX

Attribute_Definition: Maximum State Plane easting value for tile bound.

Attribute_Definition_Source: King County

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0

Range_Domain_Maximum: 1617733

Attribute_Units_of_Measure: Feet

Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: YMAX

Attribute_Definition: Maximum State Plane northing value for tile bound.

Attribute_Definition_Source: King County

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0

Range_Domain_Maximum: 353195

Attribute_Units_of_Measure: Feet

Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: Shape.area

Attribute_Definition: Area of polygon

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: System-generated area

Attribute:

Attribute_Label: Shape.len

Attribute_Definition: Perimeter of polygon

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: System-generated perimeter

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_Organization_Primary:

Contact_Organization: KCGIS Center

Contact_Person: Cheryl Wilder

Contact_Position: Data Sales Coordinator

Contact_Address:

Address_Type: mailing and physical

Address: 201 S Jackson St, Suite 700

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Country: US

Contact_Voice_Telephone: 206-263-5220

Resource_Description: /plibrary2/survey/shapes/polygon/idxptrmbr.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: ESRI Shapefile

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: //gisdw/kclib/plibrary2/survey/shapes/polygon/idxptrmbr.shp

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: /plibrary2/survey/shapes/polygon/idxptrmbr.shp

Access_Instructions: /plibrary2/survey/shapes/polygon/idxptrmbr.shp

Fees:

Contact KCGIS Client Services for the cost of reproduction - <http://www.kingcounty.gov/operations/GIS/GISData/GISDataDistribution.aspx>

Metadata_Reference_Information:

Metadata_Date: 20121219

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: King County GIS Center

Contact_Person: Mike Leathers

Contact_Position: GIS Data Coordinator

Contact_Address:

Address_Type: mailing and physical

Address: 201 S Jackson St, Suite 706

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Country: US

Contact_Voice_Telephone: 206-263-4867

Contact_Electronic_Mail_Address: firstname.lastname@kingcounty.gov

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time