York County 2007

Identification Information

Citation Information

Originator	Bradstreet Consultants
Publication Date	February 2009
Publication Time	Unknown
Title	York County 2007

Keywords

Theme	ImageryBaseMapsEarthCover (ISO Keyword Thesaurus)
Place	Maine, United States, York County (Maine GIS Thesaurus-Place)
Stratum	land surface (GCMD Parameter Keyword)

Contact Person

Mark Bradstreet

Contact Organization

Bradstreet Consultants

Contact Position

President

Address Type

mailing and physical address

Address

69 Peters Rd

City

Searsmont

State or Province

Maine

Postal Code

04973

Country

USA

Contact Voice Telephone

207-621-8500

Contact Electronic Mail Address

mark (at) bradstreet.com

Abstract

This OGC-compliant web mapping service (WMS) provides 2007 aerial orthophotos at a resolution of 6 inches for most of York County, Maine. Ortho Imagery - As the prime contractor, Bradstreet Consultants, Inc. used the aerial photography flown in one session on April 23-26, 2007, by The Sanborn Map Compay, Inc. of Charlotte, NC who acquired approximately 4,000 photos @ a resolution of 0.5' pixel (similar to 1"=600') with airborne GPS using a Z/I Digital Mapping Aerial Camera. Bradstreet Consultants, Inc. painted and repainted ground targets for photo survey control points (~400) to support full analytical aerotriangulation. The aerotriangulation solution was used to set up each stereopair of photos for orthorectification and DTM compilation. The ortho imagery was rectified from the natural color digial imagery employing a digital terrain model (DTM) collected from the 2007 imagery and supplemented from updating some town's original DTM and some town's from scratch using the imagery in softcopy (digital) stereoplotter in the Kork KDMS and DAT/EM AutoCAD DWG format.

Purpose

Use in each Town's GIS for viewing and analysis along with sale to surveying, engineering, GIS and other intersted individuals and companies.

[langdata]

English

Time Period of Content

Beginning Date	20070423
Ending Date	20070426
Currentness Reference	ground condition

Status

Progress	Complete
Maintenance and Update Frequency	None planned

Bounding Coordinates

West Bounding Coordinate	-70.3
East Bounding Coordinate	-71
North Bounding Coordinate	43-75
South Bounding Coordinate	43

Access Constraints

none

Use Constraints

Data should not be used beyond the scale of 1:1200

Data Set Credit

Bradstreet Consultants, Inc, Southern Maine Regional Planning Commission, USGS, State of Maine, Maine GeoLibrary Board.

Native Data Set Environment

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.3.1.1850

Contact Person

Mark Bradstreet

Contact Organization

Bradstreet Consultants

Contact Position

President

Process Description

Ortho Imagery - As the prime contractor, Bradstreet Consultants, Inc. used the aerial photography flown in one session on April 23-26, 2007, by The Sanborn Map Compay, Inc. of Charlotte, NC who acquired approximately 4,000 photos @ a resolution of 0.5' pixel (similar to 1"=600') with airborne GPS using a Z/I Digital Mapping Aerial Camera. Bradstreet Consultants, Inc. painted and repainted ground targets for photo survey control points (~400) to support full analytical aerotriangulation. The aerotriangulation solution was used to set up each stereopair of photos for orthorectification and DTM compilation. The ortho imagery was rectified from the natural color digial imagery employing a digital terrain model (DTM) collected from the 2007 imagery and supplement3ed from updating some town's original DTM and some town's from scratch using the imagery in softcopy (digital) stereoplotter in the Kork KDMS and DAT/EM AutoCAD DWG format.

Process Date

2007

Contact Person

Michael Smith

Contact Organization

Maine Office of GIS

Contact Position

State GIS Manager

Address Type

mailing address

Address

State House Station #174

City

Augusta

State or Province

Maine

Postal Code

04333

Country

USA

Contact Voice Telephone

207-215-5530

Contact Facsimile Telephone

207-287-3842

Contact Electronic Mail Address

michael.smith (at) maine.gov

Process Description

The SID files provided by Bradstreet were used as the source for this OGC-compliant web mapping service (WMS). The SID files are resampled to create overview TIFs and those provided in a MapServer-based environment.

Process Date

2009

Completeness Report

Orthoimagery data of York County Area, Maine clipped to within approximately 100 feet beyond the town line.

Horizontal Positional Accuracy Report

Horizontal_Positional_Accuracy_Report: Gound control used in aerotriangulation solution accurate to within 0.1 ft. Said solution was used to compile 1:1200 vector base mapping, which was subsequently used to control the orthorectification process. Vector data was compiled to meet ASPRS Class 1 accuracy standards. The orthorectification process was applied to the imagery and those features which are at ground level. No attempt was made to correctly rectify elevated structures as part of this project.

Vertical Positional Accuracy Report

Gound control used in aerotriangulation solution accurate to within 0.1 ft. Said solution was used to compile terrain data to support generation of 2 foot contour data. This elevation data was subsequently used to control the orthorectification process. The elevation data was compiled to meet ASPRS Class 1 accuracy standards. The orthorectification process was applied to the imagery and those features which are at ground level. No attempt was made to correctly rectify elevated structures as part of this project.

Metadata Reference Information

Metadata Contact

Contact Person	Mark Bradstreet
Contact Organization	Bradstreet Consultants
Contact Position	President
Address Type	mailing and physical address
Address	69 Peters Rd
City	Searsmont
State or Province	Maine
Postal Code	04973
Country	USA
Contact Voice Telephone	207-621-8500
Contact Electronic Mail Address	mark (at) bradstreet.com

Metadata Date

20090305

Direct Spatial Reference Method

Raster

Raster Object Type

Pixel

Row Count

8000

Column Count

12000

Vertical Count

Grid Coordinate System Name

Universal Transverse Mercator

UTM Zone Number

19N

Longitude of Central Meridian

-71.5

Latitude of Projection Origin

False Easting

656166.666667

False Northing

2460625

Abscissa Resolution

.15

Ordinate Resolution

.15

Planar Distance Units

meters

Horizontal Datum Name

North American Datum of 1983

Ellipsoid Name

Geodetic Reference System 80

Network Resource Name

http://www.maine.gov/geolib/wms.htm

[accinstr]

The Maine Office of GIS and the GeoLibrary Board provide web mapping services to distribute aerial photos and other digital data. A WMS is not a web application which you can see in a web browser; rather, it requires you to add the service to a GIS software application.

[ModDate]

20100330

[ModTime]

12262600

[mdDateSt]

20100330

[Sync]

TRUE