County, King, 200704, Open water for King County and portions of adjacent counties: King County, King County, WA.Online Links:
- Server=gisprod; Service=sde:sqlserver:gisprod; Database=maint; User=gisc; Version=sde.DEFAULT
This is a Vector data set.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.000250
Ordinates (y-coordinates) are specified to the nearest 0.000250
Planar coordinates are specified in survey feet
The horizontal datum used is D_North_American_1983_HARN.
The ellipsoid used is Geodetic Reference System 80.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257222.
Sequential unique whole numbers that are automatically generated.
Unique and persistent, non-sequential positive integer
Mixed case name of feature, where known; otherwise blank
| Value | Definition |
|---|---|
| 0 | Wtrbdy all |
| 1 | Bigwater river |
| 2 | Bigwater waterbody |
| Value | Definition |
|---|---|
| Wtrbdy all | Feature not part of BIGWATER cartographic set |
| Bigwater river | A significant double-banked stream or river that is part of BIGWATER cartographic set. |
| Bigwater waterbody | A significant lake or pond that is part of BIGWATER cartographic set. |
| Value | Definition |
|---|---|
| 101 | Reservoir |
| 106 | Fish hatchery or farm |
| 107 | Residential or industrial water impoundment |
| 109 | Sewage Disposal Pond |
| 116 | Bays, estuaries, gulfs, oceans |
| 400 | Rapids |
| 401 | Falls |
| 412 | River or stream |
| 414 | Ditch or channel |
| 415 | Aqueduct |
| 416 | Flume |
| 421 | Lake or pond |
| 423 | Sand or gravel |
| 902 | Fresh water island |
| Value | Definition |
|---|---|
| Non water | Land areas |
| Water | Open water |
| Value | Definition |
|---|---|
| 1 | Water |
| 0 | Non water |
| Value | Definition |
|---|---|
| Reservoir | Manmade reservoir or impoundment larger than detention pond |
| Fish hatchery or farm | Physical structure of fish hatchery or farm |
| Residential or industrial water impoundment | Manmade or man-modified detention or retention pond. Includes filled gravel or quarry pits and landscape waterbodies |
| Bays, estuaries, gulfs, oceans | Puget Sound, connecting straits and Pacific Ocean |
| Rapids | River rapids |
| Falls | River falls |
| River or stream | All linear double-banked features. Features included do not define a minimum flowrate set |
| Ditch or channel | Manmade or man-modified ditch or channelized route |
| Aqueduct | Feature for water transmission that is not considered a pipeline |
| Flume | Exposed water path usually associated with water impoundment |
| Lake or pond | Areal water feature, generally to be inferred as natural in origin though may be significantly anthropically modified or restricted |
| Sand or gravel | Non-island extents of unvegetated or lightly vegetated area adjacent to rivers |
| Sewage disposal pond | Clearly delineated barriered impoundments |
| Ditch or channel | Farm or other channelized ditch or waterway |
| Value | Definition |
|---|---|
| 3 | Possible wetland |
| 0 | Not a wetland |
| Value | Definition |
|---|---|
| Not a wetland | Not considered to be a wetland or part of a wetland area |
| Potential wetland | Considered to be possibly a wetland or part of a larger wetland area |
| Value | Definition |
|---|---|
| 1 | Current |
| Value | Definition |
|---|---|
| Current | Feature is observed in most current control imagery |
| Value | Definition |
|---|---|
| 2035 | Kitsap vector data |
| 2053 | Pierce vector source |
| 2061 | Snohomish vector data |
| 3026 | Washington Dept of Natural Resources vector data |
| 3061 | 2002 USGS digital orthophotography |
| 3066 | 2002 KC digital orthophotography |
| 3070 | 2005 Aerials Express digital orthophotography |
| 3072 | 2007 Pictometry digital orthophotography |
| 3301 | 2006 KC NAIP digital orthophotography |
Name of orthoimagery control where used for capture and validation, or name of vector dataset is appended to area outside of control
Coordinates defining the features.
Positive real numbers that are automatically generated.
The attributes provide required information for feature type determination, cartographic symbolization, provenance and topological associations.
Users should keep in mind two of the attributes, though based on ancillary data or comparative imagery analyses, contain subjective interpretations.
1. To assist users in a gross differentiation between 'natural' features and 'manmade features' areal waterbodies may be coded as FEAT_TYPE = Lake or Pond or as FEAT_TYPE = Residential or industrial water impoundments, respectively. This classication is not absolute and is based on a qualitative evaluation of the feature extent, boundary and appearance. However, any features seen in 2005/2006 imagery but not in early imagery are coded as impoundments. The FEAT_TYPE value assigned to individual features will be modified as necessary during maintenance cycles.
2. To assist users in making possible interpretations regarding wetland coincidence, the STATUS item is coded as POTENTIAL WETLAND where ancillary data provides this indication. The ancillary data includes the original coverage interpretation where the extent of the water body included non-water boundary areas and vector data compiled from many sources. Not all potential wetland areas are indicated and further refinement is anticipated.
Pierce County GIS vector data, Snohomish County GIS vector data, King County Water and Land Resources and Washington State Department of Ecology vector data
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Cartographic and analysis of anthropic and natural open water features. The layer contains a RATE item which is set to CURRENT for this edition, indicating that only the most current (non-historic) water features are shown. Historic (changed) waterbody information can be found in WTRBDY_DET_AREA
- Angel Lake renamed Angle Lake - Howard Hansen Reservoir was incorrectly labeled Chester Morse Lake. Corrected. - A small slough north of Mercer Slough Nature Park was edited so that the land between the two branches of the slough appears as non-water rather than an island.
Marine island polygons (those in Puget Sound, including Vashon), and Mercer Island polygon were permanently removed. The tide line in Puget Sound has been removed.
Prior to publication of user version to Spatial Data Warehouse the following geometry revisions are made programatically. 1. Freshwater islands are erased from underlying double-banked stream geometry 2. Manmade over-water features (Dams, wiers, docks, etc) are erased from the underlying waterbody.
Columns AA thru AN were completed at the start of the update. Three additional editors were assigned areas east of Column AN to assist in completing review of WTRBDY_AREA against the 2007 imagery. They worked on aerial waterbodies only, double-banked streams and edge-of-water (Puget Sound) are being handled separately.
Data sources used in this process:
Coded value domains assigned to the Geodatabase were used to standardize coding of all attributes, except FEATURE_ID. Correct assignment of attributes was qualitatively checked only during the Quality Assessment phase, generally by visual inspection.
The following tests were also applied in order to minimize the number of or invalid or illogical code assignments:
1. FEATURE_ID must be unique and persistent, though not necessarily sequential without breaks.
2. Potential wetlands cannot be anything but a Lake or Pond (STATUS_ID = 3 and FEAT_TYPE_ID <> 421 must be a empty set)
3. Current Reservoirs cannot be Non water (FEAT_TYPE_ID = 101 and WATER_ID = 0 and RATE_ID = 1 must be an empty set).
This test was also peformed for FEAT_TYPE_ID = 106 Fish hatchery 109 Industrial or residential water impoundment 115 Flats (tidal, mud, sand, gravel) 116 Bays, estuaries, gulfs, oceans 400 Rapids 401 Falls 412 Dam, wier or obscured 414 River or stream 415 Aqueduct 416 Flume 421Lake or pond
4. Current Dam, wier or obscured cannot be Water (FEAT_TYPE_ID = 406 and WATER_ID = 1 and RATE_ID = 1 must be an empty set).
This test was also performed for FEAT_TYPE_ID = 423 Sand and gravel 902 Fresh water island 901 Marine Island
5. Potential wetlands must be Water (STATUS_ID = 3 and WATER_ID = 0 must be empty)
6. Various test were performed where wildcard queries on the NAME item were compared to the FEAT_TYPE assigned. Though these tests are not absolute due to the way certain features are named, it did allow a search for major blunders.
7. A BIGWATER river must be a RIVER/STREAM type (SUBSET_ID =1 and FEAT_TYPE_ID <> 412 must be empty). The exception are FLUMES which are considered connecting segments of a river rather than obscure.
8. A BIGWATER lake must be LAKE/POND type (SUBSET_ID =2 and FEAT_TYPE_ID <> 421 must be empty). Some exceptions are allowed for tidal flats (part of Sound), Reservoirs, and obscured dockland areas which are included in the BIGWATER representation.
9. BIGWATER features (both rivers and lakes) must not be too small. No features below a threshhold of Shape.area < 5000 are allowed, except dockland area polygons.
10. NULLs or no value values are not allowed in any item, except for the NAME item where blanks (no value) are allowed.
11. The maintenance database includes two addition items not included in the production warehouse database. The userid of the editor and the date edited are captured. This has been set to a publication default for this version but will be maintained for all future edits.
Within the extent of orthoimagery used for capture and validation, the accuracy of the features are dependent on the accuracy of the imagery.
The original coverage data in this layer was updated using the 2002 King County Natural Color orthoimagery. This imagery is considered to be the most spatially accurate of the four imagery sets used for this edition. Within the limits of the the visual resolution and editor digitizing, features with this source are accurate to plus/minus 2 feet. Where the 2002 USGS imagery was used (outside of the extent of the King County product), the accuracy is stated as 0.5 meter. There is no accuracy statement for the 2005 Aerials Express imagery, though where the same feature appeared in 2002 and 2005, the 2002 imagery location was chosen. The accuracy of the 2006 NAIP imagery is stated as current to FSA specifications. Due to its resolution and quality, this data was used only in cases where other data was not available to to define a feature was no longer present in 2006 or to create a new feature until it can be confirmed with more accurate 2007 data.
Features were capture or updated for the entire King County area. Outside of King County, features were updated within the extent of the three main image datasets used: 2002 USGS/KC orthoimagery, 2005 Aerials Express orthoimagery, and 2006 National Agricultural Inventory Program (NAIP) orthoimagery. Outward from the extent of the imagery to the extent of the layer, vector data from adjacent counties and state agency data was used.
All features visible during the data development or quality assessment phases were captured, limited only by the ability to resolve at the capture scale. Small manmade features such as swimming pools, smaller landscape ponds, and other recreational water facilities were not included. Smaller features of interest may have been missed due to vegetation masking, or questions as to type of feature due to resolution of imagery. New features will be added and existing features corrected, based on user feedback and when the layer is reevaluated with 2007 imagery, when available.
Areal waterbodies were captured based on their visible extent. Depending on the orientation of the orthoimagery some edges may be better defined than others. Edges of water bodies were adjusted when edge-of-water vegetation masked the actual water/land interface. Though dependent on interpretation, generally the edge of a water body was defined at half the width of the edge vegetation. This is also true for edge of double-banked stream interpretations.
Only features that exhibited open water are included in this layer. However, to ensure completeness leeway was allowed to the editors to interpret the outer extent of the water body when broken by tree and shrub clusters or covered by surface-only vegetation.This may result in some inconsistency in how different water bodies are represented.
Are there legal restrictions on access or use of the data?
- 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.
206-263-5220 (voice)
/plibrary2/hydro/shapes/polygon/wtrbdy.shp
King County disclaims any warranty of use of any digital product or data beyond that for which it was designed.
| Data format: | ESRI Shapefile Size: 9.475 |
|---|---|
| Network links: |
\\gisdw\kclib\plibrary2\hydro\shapes\polygon\wtrbdy.shp |
| Media you can order: |
Yes
(format CD or DVD Read-only media, if offline)
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Contact KCGIS Client Services for the cost of reproduction - <http://www.kingcounty.gov/operations/GIS/GISData/GISDataDistribution.aspx>
206-263-4867 (voice)
firstname.lastname@kingcounty.gov
