ROPA.ROS

Data format: SDE Feature Class

File or table name: ROPA.ROS

Coordinate system: Lambert Conformal Conic

Theme keywords: ROS, rain, snow, zones, Rain-on-snow, forest practices

Abstract: ROS is a statewide coverage of rain-on-snow zones. Rain-on-snow zones are based on average amounts of snow on the ground in early January, relative to the amount of snow that could reasonably be melted during a model storm event. Five ROS zones are defined in Washington State and are based on climate, elevation, latitude, and vegetation. ROS was digitized from 1:250,000 USGS quads.

FGDC and ESRI Metadata:

Metadata elements shown with blue text are defined in the Federal Geographic Data Committee's (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM). Elements shown with green text are defined in the ESRI Profile of the CSDGM. Elements shown with a green asterisk (*) will be automatically updated by ArcCatalog. ArcCatalog adds hints indicating which FGDC elements are mandatory; these are shown with gray text.

Identification Information:


Citation:
Citation information:
Originators: Washington State Department of Natural Resources, Forest Practices Division


*Title:
ROPA.ROS
*File or table name: ROPA.ROS


Publication date: November 1991
*Geospatial data presentation form: vector digital data


Publication information:
Publication place: Olympia, Washington
Publisher: Washington Department of Natural Resources, Forest Practices Division

Online linkage: http://fortress.wa.gov/dnr/app1/dataweb/dmmatrix.html#Climatology


Description:
Abstract:
ROS is a statewide coverage of rain-on-snow zones.  Rain-on-snow zones are based on average amounts of snow on the ground in early January, relative to the amount of snow that could reasonably be melted during a model storm event.  Five ROS zones are defined in Washington State and are based on climate, elevation, latitude, and vegetation.  ROS was digitized from 1:250,000 USGS quads.

Purpose:
The Rain-on-snow coverage was created as a screening tool to identify forest practice applications that may be in a significant rain-on-snow zone (WAC 222-22-100).

*Language of dataset: en


Time period of content:
Time period information:
Single date/time:
Calendar date: November 1991

Currentness reference:
publication date

Status:
Progress: Complete
Maintenance and update frequency: None planned

Spatial domain:
Bounding coordinates:
*West bounding coordinate: -124.807006
*East bounding coordinate: -116.707113
*North bounding coordinate: 49.051366
*South bounding coordinate: 45.492371

Local bounding coordinates:
*Left bounding coordinate: 605611.000000
*Right bounding coordinate: 2551496.000000
*Top bounding coordinate: 1356335.000000
*Bottom bounding coordinate: 84480.000000

Keywords:
Theme:
Theme keywords: ROS, rain, snow, zones, Rain-on-snow, forest practices
Theme keyword thesaurus: None

Place:
Place keywords: Washington State, Washington, Pacific, Northwest
Place keyword thesaurus: None

Temporal:
Temporal keywords: 1991, November 1991

Access constraints: WA ISB, IT Security, Data Category 1 - Public Information (See Security Information). External requests for this data should be directed to the WA DNR GIS Data Center web site (http://www.dnr.wa.gov/BusinessPermits/Topics/Data/Pages/gis_data_center.aspx).


Point of contact:
Contact information:
Contact organization primary:
Contact person: Doretta Collins
Contact organization: Washington State Department of Natural Resources, Forest Practices Division
Contact position: Data Steward


Contact address:
Address type: mailing and physical address
Address:
1111 Washington ST SE
Address:
PO BOX 47012
City: Olympia
State or province: WA
Postal code: 98504-7012
Country: U.S.A.

Contact voice telephone: 360-902-1426
Contact facsimile telephone: 360-902-1428


Contact electronic mail address: doretta.collins@wadnr.gov


Security information:
Security classification system: WA ISB, Information Technology Security Standards, Policy 401-S4
Security classification: Public
Security handling description: Data Category 1 - Public Information: Public information is information that can be or currently is released to the public. It does not need protection from unauthorized disclosure, but does need integrity and availability protection controls. (Washington State Information Services Board, Information Technology Security Standards, Policy 401-S4, http://isb.wa.gov/policies/401S.doc).

*Native dataset format: SDE Feature Class
*Native data set environment:
Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.3.1.3500


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Data Quality Information:


Attribute accuracy:
Attribute accuracy report:
Rain-on-snow zones were developed by Matt Brunengo, DNR Geology Division (and Forest Practices Division) using best professional judgement.  The data have not been systematically ground truthed.

Logical consistency report:
Polygon and chain-node topology present. All errors incured during editing procedures were corrected with ArcEdit under ARC/INFO version 6.x.  All arc overshoots, undershoots, duplicate arcs, and arc intersections were corrected.  The resulting ROS coverage is topologically clean.

Completeness report:
Data set is complete

Positional accuracy:
Horizontal positional accuracy:
Horizontal positional accuracy report:
+/- 400 feet

Quantitative horizontal positional accuracy assessment:

Vertical positional accuracy:
Lineage:
Source information:
Source citation:
Citation information:
Originators: U.S. Geological Survey


Title:
1:250,000 USGS quads


Publication date: variable


Source scale denominator: 250,000
Type of source media: paper
Source citation abbreviation:
USGS quadrangles
Source contribution:
Matt Brunengo, DNR Geology Division (and Forest Practices Divisin)

Source time period of content:
Time period information:
Single date/time:
Calendar date: unknown

Source currentness reference:
publication date

Process step:
Process description:
PROCESSING PROCEDURES: Digitized from 1:250,000 USGS quads.

Process date: 1991


Process step:
Process step:
Process step:
Process step:
Process description:
Dataset copied.

Source used citation abbreviation:


Process step:
Process description:
Metadata imported.

Source used citation abbreviation:
M:\DOCUME~1\gsjj490\LOCALS~1\Temp\3\xml83.tmp


Process step:
Process description:
Metadata imported.

Source used citation abbreviation:
P:\dba_util\Metadata\ROPA\ros.xml


Process step:
Process description:
Metadata imported.

Source used citation abbreviation:
P:\dba_util\Metadata\ROPA\ros_new.xml


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Spatial Data Organization Information:


*Direct spatial reference method: Vector


Point and vector object information:
SDTS terms description:
*Name: ROPA.ROS
*SDTS point and vector object type: G-polygon
*Point and vector object count: 618

SDTS terms description:
SDTS point and vector object type: Label point
Point and vector object count: 618

SDTS terms description:
SDTS point and vector object type: GT-polygon composed of chains
Point and vector object count: 618

SDTS terms description:
SDTS point and vector object type: Point
Point and vector object count: 91

SDTS terms description:
SDTS point and vector object type: Label point
Point and vector object count: 0

ESRI terms description:
*Name: ROPA.ROS
*ESRI feature type: Simple
*ESRI feature geometry: Polygon
*ESRI topology: FALSE
*ESRI feature count: 618
*Spatial index: TRUE
*Linear referencing: FALSE


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Spatial Reference Information:


Horizontal coordinate system definition:
Coordinate system name:
*Projected coordinate system name: NAD_1983_HARN_StatePlane_Washington_South_FIPS_4602_Feet
*Geographic coordinate system name: GCS_North_American_1983_HARN

Planar:
Map projection:
*Map projection name: Lambert Conformal Conic
Lambert conformal conic:
*Standard parallel: 45.833333
*Standard parallel: 47.333333
*Longitude of central meridian: -120.500000
*Latitude of projection origin: 45.333333
*False easting: 1640416.666667
*False northing: 0.000000

Planar coordinate information:
*Planar coordinate encoding method: coordinate pair
Coordinate representation:
*Abscissa resolution: 1.000000
*Ordinate resolution: 1.000000
*Planar distance units: survey feet

Geodetic model:
*Horizontal datum name: D_North_American_1983_HARN
*Ellipsoid name: Geodetic Reference System 80
*Semi-major axis: 6378137.000000
*Denominator of flattening ratio: 298.257222

Vertical coordinate system definition:
Altitude system definition:
*Altitude resolution: 1.000000
*Altitude encoding method: Explicit elevation coordinate included with horizontal coordinates

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Entity and Attribute Information:


Detailed description:
*Name: ROPA.ROS


Entity type:
*Entity type label: ROPA.ROS
*Entity type type: Feature Class
*Entity type count: 618
Entity type definition:
ros boundary arcs (arc attribute table)

Attribute:
*Attribute label: PRECIP_SNO_ZN_CD
*Attribute alias: SNO_ZN_CD
Attribute definition:
General snow accumulation zones in Washington.  Defined area based on average amounts of snow on the ground in early January, relative to the amount of snow that could reasonably be melted during a model storm event.  Washington's five snow zones are based on climate, elevation, latitude, and vegetation.

*Attribute type: String
*Attribute width: 2
*Attribute precision: 0
*Attribute scale: 0


Attribute domain values:
Enumerated domain:
Enumerated domain value: HL
Enumerated domain value definition:
Highland

Enumerated domain:
Enumerated domain value: SD
Enumerated domain value definition:
Snow dominated zone

Enumerated domain:
Enumerated domain value: RS
Enumerated domain value definition:
Peak rain-on-snow zone

Enumerated domain:
Enumerated domain value: RD
Enumerated domain value definition:
Rain dominated zone

Enumerated domain:
Enumerated domain value: LL
Enumerated domain value definition:
Lowland

Attribute:
*Attribute label: SHAPE
*Attribute alias: Shape
*Attribute definition:
Feature geometry.
*Attribute definition source:
ESRI

*Attribute type: Geometry
*Attribute width: 4
*Attribute precision: 0
*Attribute scale: 0


Attribute domain values:
*Unrepresentable domain:
Coordinates defining the features.


Attribute:
*Attribute label: Shape
*Attribute alias: OBJECTID
*Attribute definition:
Feature geometry.
*Attribute definition source:
ESRI

*Attribute type: OID
*Attribute width: 4
*Attribute precision: 10
*Attribute scale: 0


Attribute domain values:
*Unrepresentable domain:
Coordinates defining the features.


Attribute:
*Attribute label: OBJECTID
*Attribute alias: ROS_ID
*Attribute definition:
Internal feature number.
*Attribute definition source:
ESRI

*Attribute type: Integer
*Attribute width: 4
*Attribute precision: 10
*Attribute scale: 0


Attribute domain values:
*Unrepresentable domain:
Sequential unique whole numbers that are automatically generated.


Attribute:
*Attribute label: ROS_ID
*Attribute alias: SHAPE.AREA
Attribute definition:
User-defined feature number.
Attribute definition source:
ESRI

*Attribute type: Double
*Attribute width: 0
*Attribute precision: 0
*Attribute scale: 0


Attribute:
*Attribute label: SHAPE.AREA
*Attribute alias: SHAPE.LEN


*Attribute type: Double
*Attribute width: 0
*Attribute precision: 0
*Attribute scale: 0


Attribute:
*Attribute label: SHAPE.LEN
*Attribute alias: SHAPE.LEN


*Attribute type: Double
*Attribute width: 0
*Attribute precision: 0
*Attribute scale: 0


Overview description:
Dataset overview:
ROS is a statewide coverage of rain-on-snow zones. Rain-on-snow zones are based on averalge amounts of snow on the ground in early January, relative to the amount of snow that could reasonably be melted during a model storm event. ROS was digitized from 1:250,000-scale USGS quadrangles.

Entity and attribute overview:
Five ROS zones are defined in Washington State and are based on climate, elevation, latitude, and vegetation.
Rain on snow is a process that exhibits spatial and temporal variation under natural conditions, with the effects of vegetation on snow accumulation and melt adding additional complications in prediction.
 There is no map that shows the magnitude and frequency of water inputs to be expected from rain on snow events, so we have attempted to create an index map based on what we know about the process controls and their effects in the various climatic zones.  If we assume that, averaged over many years, the seasonal storm tracks that bring warm, wet cyclonic storms to the Northwest have access to all parts of Washington , then the main factors controlling and/or reflecting the occurrence and magnitude of a R/S event in any particular place are:
 
   1) Climatic region: especially the differences between windward and leeward sides of major mountain ranges, which control seasonal climatic patterns;
   2) Elevation: controls temperature, thus the likelihood and amount of snow on the ground, and affects orographic enhancement of storm precipitation;
   3) Latitude: affects temperature, thus snow;
   4) Aspect: affects insolation and temperature (especially in winter), thus melting of snow;
   5) Vegetation: the species composing forest communities can reflect the climate of an area (tolerance of warmth or cold, wet or dry conditions, deep and/or long lived snowpacks); the height and density of vegetation also partly controls the amount of snow on the ground.
 As natural vegetation integrates the effects of all of these controls, we tried to find or adapt floral indicators of the various zones of water input.   We designed the precipitation zones to reflect the amount of snow likely to be on the ground at the beginning of a storm.  We assumed that some middle elevation area would experience the greatest water input due to R/S, because the amount of snow available would be likely to be approximately the amount that could be melted.  Higher and lower elevation zones would bear diminished effects, but for opposite reasons (no snow to melt, vs too cold to melt much).  These considerations suggested a three  or five zone system.  We chose to designate five zones because a larger number of classes reduces the importance of the dividing lines, and thus of the inherent uncertainties of those lines.  The average  snow water equivalents (SWE) for the early January measurements at about 100 snow courses and snow pillows were compiled; snow depths for the first week in January at about 85 weather stations  were converted into SWE.  For each region (western North Cascades, Blue Mountains, etc.), the snow amounts were sorted by station elevation to derive a rough indicator of the relationship between snow accumulation and elevation.  (Subregional differences in snow accumulation patterns were also recognized.)  After trying various combinations of ratios for areas where the snow hydrology is relatively well known, we adopted the following designations: 
   5. Highlands: >4 5 times ideal SWE; high elevation, with little likelihood of significant water input to the ground during storms (precipitation likely to be snow, and liquid water probably refreezes in a deep snowpack); effects of harvest on snow accumulation are minor;
   4. Snow dominated zone: from "1.25 1.5 ideal SWE, up to "4; melt occurs during R/S (especially during early season storms), but effects can be mitigated by the lag time of percolation through the snowpack;
   3. Peak rain on snow zone: "0.5 0.75 up to "1.25 ideal SWE; middle elevations: shallow snowpacks are common in winter, so likelihood and effects of R/S in heavy rainstorms are greatest; typically more snow accumulation in clearings than in forest; 
   2. Rain dominated zone: "0.1 0.5 ideal SWE; areas at lower elevations, where rain occasionally falls on small amounts of snow;
   1. Lowlands: <0.1 ideal SWE; coastal, low elevation, and rain shadow areas; lower rainfall intensities, and significant snow depths are rare.
Precipitation zones were mapped on mylar overlays on 1:250,000 scale topographic maps.  Because snow depth is affected by many factors, the correlation between snow and elevation is crude, and it was not possible to simply pick out contour markers for the boundaries.  Ranges of elevations were chosen for each region, but allowance was made for the effects of subregional climates, aspect, vegetative indicators of snow depth, etc.  Thus, a particular boundary would be mapped somewhat lower on the north side of a ridge or in a cool valley (e.g. below a glacier), reflecting greater snow accumulations in such places.  The same boundary would be mapped higher on the south side of the ridge, where interstorm sunshine could reduce snow accumulation.  Conditions at the weather stations and snow courses were used to check the mapping; but in areas where measurements are scarce, interpolation had to be performed. 
 
 The boundaries of the precipitation zones were entered in the DNR's GIS.  Because of the small scale of the original mapping and the imprecision of the digitizing process, some errors were introduced.  It should not be expected that GIS images can be projected to large scales to define knife edge zone boundaries (which don't exist, anyway), but they are good enough to locate areas tens of acres in size.

 Some apparent anomalies in the map require explanation.  Much of western Washington is mapped in the lowland or highland zones.  This does not mean that R/S does not occur in those areas; it does, but on average with less frequency and hydrologic significance than in the middle three zones.  Most of central and eastern Washington is mapped in the rain dominated zone, despite meager precipitation there; this means only that the amount of snow likely to be on the ground is small, and storm water inputs are composed dominantly of the rain itself, without much contribution from snowmelt.  Much of northeastern Washington is mapped in the peak R/S zone, despite the fact that such events are less common there than in western Washington.  This is due to the fact that there is less increase in snow depth with elevation (i.e. the snow wedge is less steep), so a wider elevation band has appropriate snow amounts; plus, much of that region lies within that elevation band where the 'ideal' amount of snow is liable to be on the ground when a model R/S event occurs.  This does not reflect the lower frequency of such storms in that area.

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Distribution Information:


Distributor:
Contact information:
Contact organization primary:
Contact person: Doretta Collins
Contact organization: Washington State Department of Natural Resources, Forest Practices Division
Contact position: GIS Analyst


Contact address:
Address type: mailing and physical address
Address:
1111 Washington ST SE
Address:
PO BOX 47012
City: Olympia
State or province: WA
Postal code: 98504-7012
Country: U.S.A.

Contact voice telephone: 360-902-1426
Contact facsimile telephone: 360-902-1428


Contact electronic mail address: Doretta.Collins@dnr.wa.gov


Resource description: Rain on Snow


Distribution liability:
Disclaimer 
This digital data and metadata, (hereinafter collectively referred to as the "information"), are provided on an "AS IS", "AS AVAILABLE" and "WITH ALL FAULTS" basis. Neither Department of Natural Resources nor any of its officials and employees makes any warranty of any kind for this information, express or implied, including but not limited to any warranties of merchantability or fitness for a particular purpose, nor shall the distribution of this information constitute any warranty. 
The information is collected from various sources and will change over time without notice. DNR and its officials and employees assume no responsibility or legal liability for the accuracy, completeness, reliability, timeliness, or usefulness of any of the information provided nor do they represent that the use of any of the information will not infringe privately owned rights. 
The information is not intended to constitute advice nor is it to be used as a substitute for specific advice from a licensed professional. You should not act (or refrain from acting) based upon the information without independently verifying the information and, as necessary, obtaining professional advice regarding your particular facts and circumstances. 
References to any specific commercial product, process, and service by trade name, trademark, or manufacturer do not constitute or imply endorsement, recommendation, or favoring by DNR and its officials and employees. 
IN NO EVENT WILL DNR BE LIABLE TO YOU OR ANY THIRD PARTY FOR ANY DAMAGES ARISING OUT OF THE USE OF OR INABILITY TO USE THE DIGITAL DATA, EVEN IF DNR IS ADVISED OF THE POSSIBILITY OF SUCH DAMAGES

Standard order process:
Digital form:
Digital transfer information:
Format name: ARCE
Format version number: Arc 7.x
Format specification:
ARC/INFO Export Format (.e00)
Transfer size: 1.745

Digital transfer option:
Online option:
Access instructions:
download data set from: http://www3.wadnr.gov/dnrapp6/dataweb/dmmatrix.html


Offline option:

Fees: $0
Ordering instructions:
This data set can be downloaded from the WA DNR web page: http://fortress.wa.gov/dnr/app1/dataweb/dmmatrix.html  You must read and accept an on-line Product License Agreement before downloading data.


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Metadata Reference Information:


*Metadata date: 20101028


*Language of metadata: en


Metadata contact:
Contact information:
Contact organization primary:
Contact person: Doretta Collins
Contact organization: Washington State Department of Natural Resources, Forest Practices Division
Contact position: GIS Analyst


Contact address:
Address type: mailing and physical address
Address:
1111 Washington ST SE
Address:
PO BOX 47012
City: Olympia
State or province: WA
Postal code: 98504-7012
Country: U.S.A.

Contact voice telephone: 360-902-1426
Contact facsimile telephone: 360-902-1428


Contact electronic mail address: Doretta.Collins@dnr.wa.gov


*Metadata standard name: FGDC Content Standards for Digital Geospatial Metadata
*Metadata standard version: FGDC-STD-001-1998
*Metadata time convention: local time


Metadata extensions:
Online linkage: