GIS Data Catalog
IDXP7500 - 7500-ft Tiling Index for King County Raster Data
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Summary
This index is primarily a data processing, data storage level index which allows all raster and image data stored at this level to be maintained in a common, consistent tile and naming scheme.
The index also serves as a useful central reference scheme for identification of real-world locations.
This index level is useful for users of LiDAR-derived elevation data stored as TINS because TIN format data, as well as ASCII format data, are stored only at this tiling level.
Imagery in native uncompressed format will also be stored only at this level.
As each cell is defined with orthogonal edges relative the Washington State Plane coordinate system, it accomodates most common pixel resolutions of multiple ground sample distance (gsd) without partial pixel effects and without zero or NULL data 'splinters'.
Description
A spatial tiling index designed for storage of file-based image and other raster (i.e., LiDAR elevation, landcover) data sets.
A regular grid with origin at 0,0 of the Washington North State Plane Coordinate System, with grid cells defined by orthogonal bounds 7500 feet long in easting and in northing.
Only those cells currently involved in one of several image/raster data projects for King County and southwestern Snohomish County are labelled, though the labeling scheme can be extended.
The name of the spatial index is derived from the acronym (I)n(D)e(X) (P)olygons at the (7500) foot tile level, or idxp7500.
Cell label is a row-id cocantenated with a column-id generating a four-character identifier that uniquely identifies every cell.
The row portion of the identifier is a two-character alpha code of the format aa, ab, ac....
ba, bb, etc. and the column portion is a two-digit integer value such as 01, 02, 03....
11,12,13, etc. A composite cell identifier would be then, for example, aa01, aa02, .....ba11,ba12, etc. Not all image and raster data is stored at the tiling level represented by this index.
Data is stored at this level if full-resolution, uncompressed data would generate larger than manageable file sizes at a larger tile size.
Layer information
| Layer Name | idxp7500_area |
| Subject Category | Survey |
| Title | IDXP7500 - 7500-ft Tiling Index for King County Raster Data |
| Feature Count | 2295 |
| Feature Type | Polygon |
| Next Update | As needed |
| Spatial reference | EPSG:2926 |
| Control ID | 743 |
| Place Keywords | Seattle, Washington State, Pacific NW, King County, WA, Snohomish County, Southwestern Portion |
| Theme Keywords | Reference Grids, Survey, Image Data, Raster Data, Spatial Index, Tiling Index |
| Supplemental Information |
This spatial index is one of three index or tiling levels used to store King County image and raster data. 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/idxp7500_shp as 'tileabb'_bnd.shp. |
Table Preview
Attribute information
|
SHAPE
From ESRI |
Description
Feature Geometry DomainCoordinates defining the features |
|
ZONENW
From King County |
Description
Defines whether cell belongs to Northwest Zone polygon of idxpzone index DomainN - Cell does not belong to zone NW - Cell belongs to NW Zone |
|
ZONENE
From King County |
Description
Defines whether cell belongs to Northeast Zone polygon of idxpzone index DomainN - Cell does not belong to zone NE - Cell belongs to NE Zone |
|
ZONESE
From King County |
Description
Defines whether cell belongs to Southeast Zone polygon of idxpzone index DomainN - Cell does not belong to zone SE - Cell belongs to SE Zone |
|
ZONESW
From King County |
Description
Defines whether cell belongs to Southwest Zone polygon of idxpzone index DomainN - Cell does not belong to zone SW - Zone belongs to SW Zone |
|
Acres
From King County |
Description
Acres in polygon Domain1291.32231405 to 1291.32231405 by |
|
OBJECTID
From ESRI |
Description
Internal feature number. DomainSequential unique whole numbers that are automatically generated. |
|
TILE_ID
From King County |
Description
Five digit integer identifier for each cell Domain10101.00000000 to 15145.00000000 by |
|
TILE_ABB
From King County |
Description
Unique alphanumeric identifier for each cell comprised of two-character alpha code defining in which spatial column the cell exists cocantenated with a two-digit numeric code defining in which spatial row the cell exists. Alpha portion is uppercase. DomainAlpha code AA04, AA05, BB12, BC16, etc. |
|
TILE_ABBLC
From King County |
Description
Primary 'colloquial' identifier for each cell identical in value to the tile_abb, but where the alpha portion of the code is lowercase. Unique alphanumeric identifier comprised of two-character alpha code defining in which spatial column the cell exists cocantenated with a two-digit numeric code defining in which spatial row the cell exists. DomainUnique alphanumeric code |
|
COL_ABB
From King County |
Description
Unique alpha identifier for each column, in uppercase. DomainAlpha codes beginning with AA and sequencing as AB, AC... AZ, then reinitializing as BA, BB, ... out to the current limit of the defined cells. |
|
COL_ABBLC
From King County |
Description
Unique alpha identifier of each column in lowercase. DomainAlpha codes beginning with aa and sequencing as ab, ac... az, then reinitializing as ba, bb, ... out to the current limit of the defined cells. |
|
COL_ID
From King County |
Description
Three-digit numeric code uniquely identifying each column Domain101.00000000 to 151.00000000 by |
|
ROW_ID
From King County |
Description
Unique integer identifier for each row Domain1.00000000 to 45.00000000 by |
|
AREA_SQFT
From King County |
Description
Restating of system-generated area value to provide area value in square feet if shapefile is projected to different system. Domain56250000 to 56250000 by |
|
AREA_SQKM
From King County |
Description
Area of each cell in square kilometer Domain5.22499990 to 5.22499990 by |
|
AREA_SQMI
From King County |
Description
Area of each cell in square miles. Domain2.01699995 to 2.01699995 by |
|
PERIM_FT
From King County |
Description
Restating of system-generated area value to provide area value in square feet if shapefile is projected to different system. Domain30000.00000000 to 30000.00000000 by |
|
PERIM_M
From King County |
Description
Perimiter of each cell in meters Domain9144.00000000 to 9144.00000000 by |
|
XMIN
From King County |
Description
Minimum State Plane Washington North Zone Easting Domain1215000 to 1590000 by 1 |
|
YMIN
From King County |
Description
Minimum State Plane Washington North Zone Northing Domain22500 to 345000 by 1 |
|
XMAX
From King County |
Description
Maximun State Plane Washington North Zone Easting Domain1222500 to 1597500 by 1 |
|
YMAX
From King County |
Description
Maximun State Plane Washington North Zone Northing Domain30000 to 352500 by 1 |
|
Shape.STArea()
From SQL Server |
Description
Returns the area of a geometry instance in square units, based on the spatial reference identifier (SRID) of the geometry. DomainDouble |
|
Shape.STLength()
From SQL Server |
Description
Returns the total length of the elements in a geometry instance. DomainDouble |
Contact information
| Maintained by | KCGIS Center |
| Primary |
KCGIS Center
giscenter@kingcounty.gov |
Terms of Use
| License | Terms of use and copyright |
Use this Data
|
Links
How to use in ArcGIS Pro |
|
| Sharing Status | Public |
Summary
This index is primarily a data processing, data storage level index which allows all raster and image data stored at this level to be maintained in a common, consistent tile and naming scheme.
The index also serves as a useful central reference scheme for identification of real-world locations.
This index level is useful for users of LiDAR-derived elevation data stored as TINS because TIN format data, as well as ASCII format data, are stored only at this tiling level.
Imagery in native uncompressed format will also be stored only at this level.
As each cell is defined with orthogonal edges relative the Washington State Plane coordinate system, it accomodates most common pixel resolutions of multiple ground sample distance (gsd) without partial pixel effects and without zero or NULL data 'splinters'.
Description
A spatial tiling index designed for storage of file-based image and other raster (i.e., LiDAR elevation, landcover) data sets.
A regular grid with origin at 0,0 of the Washington North State Plane Coordinate System, with grid cells defined by orthogonal bounds 7500 feet long in easting and in northing.
Only those cells currently involved in one of several image/raster data projects for King County and southwestern Snohomish County are labelled, though the labeling scheme can be extended.
The name of the spatial index is derived from the acronym (I)n(D)e(X) (P)olygons at the (7500) foot tile level, or idxp7500.
Cell label is a row-id cocantenated with a column-id generating a four-character identifier that uniquely identifies every cell.
The row portion of the identifier is a two-character alpha code of the format aa, ab, ac....
ba, bb, etc. and the column portion is a two-digit integer value such as 01, 02, 03....
11,12,13, etc. A composite cell identifier would be then, for example, aa01, aa02, .....ba11,ba12, etc. Not all image and raster data is stored at the tiling level represented by this index.
Data is stored at this level if full-resolution, uncompressed data would generate larger than manageable file sizes at a larger tile size.
Contact information
| Maintained by | KCGIS Center |
| Primary |
KCGIS Center
giscenter@kingcounty.gov |
Terms of use and copyright
| License | Terms of use and copyright |
Change history
| 3/1/2010 |
Grid imported from shapefile to featureclass. Grid extended along northern edge in Snohomish County to accomodate expansion of new image acquisition projects. |
| 6/1/2003 |
To accomodate generation of the Zone level tiling index, additional attributes were added to the index shapefile dbf to indicate of which zone each cell is a member. |
| 1/1/2003 |
ArcInfo GENERATE command with FISHNET option was used to create the polygon coverage of individual cells. The coverage was converted to a shapefile. An integer row-id and integer column-id were updated for the PAT. The values from each of these items was cocatenated to produce a unique integer identifier for each cell. Process_Date: 012003. |
| 1/1/2002 |
Microsoft Excel was used to create a master attribute spreadsheet with all other cell attributes tied to the unique integer id of each cell. The data from the spreadsheet was exported to text format and joined to the shapefile dbf in ArcView. The resulting updated shapefile was reexported to a final shapefile. |