Raster Images for Cowlitz County

Section Index

Identification Information

Citation:
Citation Information:
Originator: Cowlitz County GIS Department
Publication Date: Unknown
Title: Raster Images for Cowlitz County
Geospatial Data Presentation Form: map
Publication Information:
Publication Place: Kelso, WA
Publisher: Cowlitz County GIS Department
Description:
Abstract:
Raster Images for Cowlitz County consists of two types. The first type consists of more than 1100 raster images of vector drawn cadastral and environmental maps registered to State Plane Coordinates. The second type of raster image, not yet available, will consists of unregistered, raster images of "assessor’ house sheets", appraisal photos, plats, and other relevant images of legal records and documents attached to a database record in the GIS.
Purpose:
Cowlitz County GIS creates raster image catalogs for a twofold purpose: 1. To provide reference information to maps 2. To provide an efficient and cost effective means to disseminate the entire set of cadastral maps for Cowlitz County.
Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: 1995
Ending Date: Present
Currentness Reference: publication date
Status:
Progress: In Work
Maintenance and Update Frequency: As needed
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: 123.21088
East Bounding Coordinate: 122.22436
North Bounding Coordinate: 46.41265
South Bounding Coordinate: 45.82917
Keywords:
Theme:
Theme Keyword Thesaurus: None
Theme Keyword: Image
Theme Keyword: Raster
Theme Keyword: Scan
Place:
Place Keyword Thesaurus: None
Place Keyword: Cowlitz County
Place Keyword: Washington
Place Keyword: Washington State
Access Constraints: None for off line access. On-line access to this data is restricted to departments of Cowlitz County Government.
Use Constraints: None
Point of Contact:
Contact Information:
Contact Person Primary:
Contact Person: Chris Schaefer
Contact Organization: Cowlitz County GIS Department
Contact Position: GIS Manager
Contact Address:
Address Type: mailing address
Address: 207 4th Ave.,North
City: Kelso
State or Province: WA
Postal Code: 98626
Contact Voice Telephone: (360) 577-3025
Contact Facsimile Telephone: 360 423-9986
Contact Electronic Mail Address: SchaeferC@Co.Cowlitz.Wa.US
Hours of Service: 8-5 WST
Contact Instructions: Additional contact persons: George Bradford, PLS (GIS Surveyor) or Doug Willoughby (GIS Deputy Manager); Phone (360) 577-3025
Browse Graphic:
Browse Graphic File Name: Image.jpeg
Browse Graphic File Description: Raster Images for Cowlitz County
Browse Graphic File Type: JPEG
Native Data Set Environment: Raster: SourceView (R) running on Windows (R) NT 4.0

Data Quality Information

Attribute Accuracy:
Attribute Accuracy Report: Raster images are indexed to a data base record for GIS retrieval but are not stored with an attribute record.
Logical Consistency Report: Data set is in raster format.
Completeness Report:
For Spatially Registered Maps: Raster images of all cadastral maps are complete and are being maintained regularly.
For Non-registered Maps:
Imaging of non-spatially registered images is planned but has not yet begun.
Positional Accuracy:
Horizontal Positional Accuracy:
Horizontal Positional Accuracy Report:
For Spatially Registered Images (rebuilt cadastral maps) Horizontal positional accuracy of all SourceView (R) converted files compares to the horizontal accuracy of the original vector CAD files from which they were created . However, when deriving x.y values from SourceView raster files, caution must be exercised for the following reasons: a. SourceView files are visually positioned and scaled to match two (vector) points derived from the original file b. To extract x, y values from a SourceView raster file requires visually selecting a point at a certain zoom level. In actual testing, selecting the same point on the SourceView raster file as that of the vector file, x, y values differed by +/- .5 ft (best case).

For Spatially Registered Images (Scanned cadastral maps from originals)
Horizontal positional accuracy of all SourceView (R) scanned files compares to the horizontal accuracy of the original mylar, hand drawn source plats/maps from which they were created.

For Non-Registered images
Images are not spatially registered.

Lineage:
Source Information:
Source Citation:
Citation Information:
Originator: ValueCAD
Publication Date: 1994-1995
Title: Cadastral Map Images
Geospatial Data Presentation Form: map image
Publication Information:
Publication Place: Kelso, WA and Aurora, CO
Publisher: Cowlitz County Assessor's Office
Type of Source Media: CD-ROM
Source Time Period of Content:
Time Period Information:
Single Date/Time:
Calendar Date: 1994
Source Currentness Reference: publication date
Source Citation Abbreviation: MapImages
Source Contribution: Cadastral Map Images at the following scales: 1200, 2400, 4800
Process Step:
Process Description:
Cowlitz County GIS has, in cooperation with the County Assessor’s Map Segregation Department, begun a process to fully automate the County’s cadastral maps and map updating by a. Initially scanning all 1100 assessor’s plats and map sheets and b . Developing a rigorous program to rebuild and replace incrementally each of the scanned maps by creating "raster images" of thoroughly researched, rebuilt vector files. The bundled set of originally scanned and rebuilt map images are distributed to both public (county network) and private use (CD)
For Spatially Registered Images (Scanned From Original Mylars)

Initially, more than 1100 mylar, cadastral maps were scanned from mylar originals at 300 dpi by ValueCad, a commercial mapping company.. Each map image was prepared for loading into SourceView(R), a relational image based mapping system from Momentum Systems, by assigning to each image an unique identifier and registering each image to state plane coordinates. Positioning points (NE and SW section corners)were selected from the Washington State’s Department of Natural Resources (POCA) file with general accuracy.. No additional effort was made to warp or rubber sheet scanned images to better survey control.

For Spatially Registered Images (Images of Rebuilt Cadastral Maps)
The following steps are followed to convert vector CAD/Arc Infor (R) file to SourceView (R) images:
A. Rebuilt, finished CAD/ArcInfo(R) files are converted to "postscipt" format.
B. By a utility Postscipt files are converted to a CalGrp4 TIFF image
C. Archive old scanned image and replace with new image from rebuilt CAD/ArcInfo(R) file.
For Non-Spatially Registered Images.
Non-spatially registered images will be scanned in JPEG format.

Process Date: 1992 to present

Spatial Data Organization Information

Indirect Spatial Reference: Cowlitz County, WA
Direct Spatial Reference Method: Vector

Spatial Reference Information

Horizontal Coordinate System Definition:
Planar:
Grid Coordinate System:
Grid Coordinate System Name: State Plane Coordinate System 1983
State Plane Coordinate System:
SPCS Zone Identifier: 4602
Lambert Conformal Conic:
Standard Parallel: 45.8333333333
Standard Parallel: 47.3333333333
Longitude of Central Meridian: -120.5
Latitude of Projection Origin: 45.3333333333
False Easting: 500000
False Northing: 0
Planar Coordinate Information:
Planar Coordinate Encoding Method: Coordinate Pair
Coordinate Representation:
Abscissa Resolution: 0.001
Ordinate Resolution: 0.001
Planar Distance Units: U.S. survey feet

Entity and Attribute Information

Overview Description:
Entity and Attribute Overview: Raster images are indexed by a unique ID but do not contain attributes.
Entity and Attribute Detail Citation: None

Distribution Information

Distributor:
Contact Information:
Contact Person Primary:
Contact Person: Chris Schaefer
Contact Organization: Cowlitz County GIS Department
Contact Position: GIS Manager
Contact Address:
Address Type: mailing address
Address: 207 4th Ave.,North
City: Kelso
State or Province: WA
Postal Code: 98626
Contact Voice Telephone: (360) 577-3025
Contact Facsimile Telephone: 360 423-9986
Contact Electronic Mail Address: SchaeferC@Co.Cowlitz.Wa.US
Hours of Service: 8-5 WST
Contact Instructions: Additional contact persons: George Bradford, PLS (GIS Surveyor) or Doug Willoughby (GIS Deputy Manager); Phone (360) 577-3025
Distribution Liability:
The data was created for use by the Cowlitz County GIS Department as part of the mapping effort to create a comprehensive GIS. Although Cowlitz County promotes the use of this data for various mapping tasks, any use/application of this data for non-county department purposes is the responsibility of the user and such use/application is at the user’s own risk. Cowlitz County diclaims all liability regarding fitness of the information for any use other than Cowlitz County business.
Standard Order Process:
Digital Form:
Digital Transfer Information:
Format Name: CalGrp 4, JPEG
Format Information Content: Raster Images
Digital Transfer Option:
Offline Option:
Offline Media: CD-ROM
Recording Capacity:
Recording Density: 650
Recording Density Units: Megabytes
Recording Format: DOS/NT Copy
Fees:
$50 per hour labor reduced to $40.00 per hour for Cowlitz County "project partners" with signed data sharing agreements. CD charges are $12.00 per CD. Floppy disk charges are $2.00 per diskette. Delivery charges are extra.
Ordering Instructions: Order by telephone, or e-mail, or in person.
Custom Order Process:
Upon request, Cowlitz County GIS Department can produce custom plots of any or all GIS layers available to the public. Cowlitz County GIS Department can produce a wide range of hardcopy color plots (Inkjet A-E color output)on various media or alternatively transfer information digitally.

Metadata Reference Information

Metadata Date: 19971007
Metadata Review Date: 19990515
Metadata Future Review Date: 20000401
Metadata Contact:
Contact Information:
Contact Person Primary:
Contact Person: Chris Schaefer
Contact Organization: Cowlitz County GIS Department
Contact Position: GIS Manager
Contact Address:
Address Type: mailing address
Address: 207 4th Ave.,North
City: Kelso
State or Province: WA
Postal Code: 98626
Contact Voice Telephone: (360) 577-3025
Contact Facsimile Telephone: 360 423-9986
Contact Electronic Mail Address: SchaeferC@Co.Cowlitz.Wa.US
Hours of Service: 8-5 WST
Contact Instructions: Additional contact persons: George Bradford, PLS (GIS Surveyor) or Doug Willoughby (GIS Deputy Manager); Phone (360) 577-3025
Metadata Standard Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version: FGDC-STD-001-1998