Extent of Imagery and other Raster Datasets for King County

Description

Layer name: ALLEXTENTS
Subject category: survey
Title: Extent of Imagery and other Raster Datasets for King County
Feature Count: 0
Feature Type: Polygon
Abstract: Geographic extent of each image/raster data set in the King County Spatial Data Warehouse described as a bounding polygon. The individual polygon bounds are stored separately as x_'dataset-name'.shp for maintenance purposes and also as a composite (merged) layer of all overlapping bounds. The polygon bounds describe the true edge of valid data of each dataset, which may lie inside the extent of NULL or zero values, or the extent of the minimal-bounding rectangle (mbr) of the dataset. Many of the bounding polygons names in the merged file and the names of the individual files complement names of data subdirectories within the idxp7500 and idxptrmbr master directories, as the full extent of these datasets is comprised of multiple tiles of more limited extent. Other bounding extent titles will not have a subdirectory for the dataset as they exist solely as a single theme at the KeyRegion (maximum extent) level.
Purpose: Few of the raster data sets in the SDW have coincident extents so the extents polygons can be used to determine if valid data from that dataset exists for a given area of interest. These extent polygons are not tiling or spatial indexes as they do not indicate how the data is subdivided and stored in the warehouse. Users are refered to the tiling indexes and associated metadata available on the KCGIS Spatial Data Catalog webpage at This theme may be used in conjunction with the raster status indexes, RASTSTAT_7500_AREA and RASTSTAT_TRMBR_AREA, which illustrate the availability of tiles in the raster library. The status indexes will show if a tile exists for a given dataset but the extent theme is required to determine if the full extent of a given tile contains valid data, i.e, useable imagery, elevation grid, landcover data.
Status: Complete
Updated: As needed
Time period of content: (single date,as YYYYMMDD):: 20150130
Time period of content: (date range, as YYYYMMDD):: -
Spatial reference: WA State Plane North
FGDC Documentation: Classic or FAQ
Open Data Availability: Unknown
Place Keywords: Pacific NW, WA, Washington state, King County,
Theme Keywords: Maxiumum tiling extent, reference grids, image data, raster data, survey,
Lineage: Available
Supplemental Information: None

Contacts

Maintained by:
King County GIS Center
Primary: Mike Leathers, GIS Data Coordinator, 206-263-4867
(How to e-mail a County contact)
Secondary: KCGIS Center; giscenter@kingcounty.gov. This mailbox is monitored during business hours.

Attribute Information

Constraints

Access: None

Use: 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.