Job Reference #: 07-014
Job Name: City of Eureka Base Mapping
Job Area/Location: Eureka, California
3Di West (GeoTerra): Leanne Mitchell – Project Mgr / Lynn Engel – Photogrammetry Mgr
Address: 3400 West 11th Ave., Eugene OR 97402
Phone: (541) 343-8877 Fax: (541) 343-8879 E-mail: lmitchell@3diwest.com
Client: City of Eureka 
Contact person: Riley Topolewski
Address: 531 K Street, Eureka, CA 95501
Phone: 707-268-1971 Fax:   E-mail: rtopolewski@ci.eureka.ca.gov
Date of award: 8-Jan-07
Purpose of Job: Mapping and orthophotography
Scale of Job: 1" = 40'/100'   Contour Interval: 1'/2'   Pixel Resolution: .25' .50'
Photography source: American Aerial Flown on: 2-Mar-07
Aerial photos: 15 line(s) 188 exposure(s) 6 " camera 1" = 300'/600'  Color
Camera info: camera #: 141307 lens #: 141329 F.L.: 154.072 calib.: 14-Feb-06
Image Scanning by: Bergman Photographic Service 
Scanning Resolution at 12.5 microns or 2,032 dpi            
Survey source: Omsberg and Preston
Contact name: Kim Preston
Address: 304 "N" Street, Eureka, CA 95501
Phone: (707)443-8651 Fax:   E-mail:  
Airborne GPS source: Tucker & Associates
Contact name:  
Address: 1362 Lincoln Ave., Calistoga CA  94515
Phone: 707-942-6001 Fax:   E-mail: tasurv@sbcglobal.net
Control sources: 11 control points established, control network extended by aerial triangulation
Datum: Horizontal: NAD 83 (Adj. HPGN) Vertical: NAVD 88
Coordinate system: California State Plane  Zone: 1 
Units:  US Survey feet     
General Accuracy: This map data has been photogrammetrically compiled to meet National Map Accuracy Standards at 1" = 40'/100' scale with a  1'/2' contour interval.  Publication or use at any other scale will void any implied or stipulated accuracy standards.
Horizontal Accuracy: Not more than 10% of all well-defined planimetric features are in error by more than .02" at plot scale.
Vertical Accuracy: Not more than 10% of all vertical points are in error by more than ½ the contour interval.  Dashed contours in areas covered by dense vegetation or shadows may be less than standard accuracy.
Orthophoto Quality: Orthophotos were designed for optimal viewing at 1" = 40'/100' scale.  Performing quality control on or plotting images at scales larger than 1" = 20'/50’ scale is not recommended.  Anomalies observable only at scales larger than  1" = 20'/50’ scale are considered to fall outside the specifications of this project.
Note: Field verification of map accuracy should occur prior to design level tasks that are dependent on this map.
Layer structure: Layers used are 3DI’s standard  layer scheme.
Symbol set: Symbols used are 3DI’s standard  symbol set.