Cumberland County 1' 2009

Identification Information

Citation Information

Originator	U.S. Geological Survey
Publication Date	Unknown
Title	Cumberland County 1' 2009
Geospatial Data Presentation Form	remote-sensing image
Publication Place	Sioux Falls, SD
Publisher	U.S. Geological Survey

Abstract

This data set consists of 0.3-meter pixel resolution (approximately 1-foot), natural color orthoimages covering the urban area footprint. An orthoimage is remotely sensed image data in which displacement of features in the image caused by terrain relief and sensor orientation have been mathematically removed. Orthoimagery combines the image characteristics of a photograph with the geometric qualities of a map. The design accuracy is estimated not to exceed 3-meter diagonal RMSE (2.12m RMSE in X or Y). Each orthoimage provides imagery over a 1500-meter by 1500-meter block on the ground. There is no image overlap between adjacent files. The projected coordinate system is UTM with a NAD83 datum. The naming convention is based on the U. S. National Grid (USNG), taking the coordinates of the SW corner of the orthoimage. Task Order Number G09PD01896. USGS Contract Number 07CRCN0014. Nominal Acquisition Altitude (AGL) was 9600'. The geoid used to reduce satellite derived elevations to orthometric heights was Geoid 03. GPS coordinates are referenced to NAD83 Universal Transverse Mercator Zone 19. The maximum differential baseline length is 69373.00 meters. The mean baseline length is 25668.18 meters. Camera sensors calibration reports are included in the project report. Calibration flights are flown regularly.

Purpose

This data depicts geographic features on the surface of the earth. It was created to provide easily accessible geospatial data which is readily available to enhance the capability of Federal, State, and local emergency responders, as well as plan for homeland security efforts. This data also supports The National Map.

Time Period of Content

Beginning Date	20091108
Ending Date	20091117
Currentness Reference	ground condition

Status

Progress	Complete
Maintenance and Update Frequency	Unknown

Bounding Coordinates

West Bounding Coordinate	-70.518700
East Bounding Coordinate	-69.731254
North Bounding Coordinate	44.012279
South Bounding Coordinate	43.236334

Keywords

Theme	0.3 meter orthoimage, rectified photograph, rectified image, orthophoto, natural color orthophoto, orthoimage, image map (None)
Place	US (U.S. Department of Commerce, 1995, Countries, dependencies, areas of special sovereignty, and their principal administrative divisions, Federal Information Processing Standard (FIPS) 10-4): Washington, D.C., National Institute of Standards and Technology.)
Place	ME (U.S. Department of Commerce, 1987, Codes for the Identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard (FIPS) 5-2): Washington, D.C., National Institute of Standards and Technology.)
Place	Portland, ME (None)

Access Constraints

None

Use Constraints

None. However, users should be aware that temporal changes may have occurred since this data set was collected and that some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of it's limitations.Acknowledgment of the U.S. Geological Survey would be appreciated for products derived from these data.

Contact Organization

Maine Office of GIS

Contact Position

GIS Coordinator

Address Type

mailing address

Address

State House Station #174

City

Augusta

State or Province

Maine

Postal Code

04333

Country

USA

Contact Voice Telephone

207-624-7700

Contact Facsimile Telephone

207-287-3842

Data Set Credit

Photo Science, Inc. in combination with JWSewall.

Native Data Set Environment

Intergraph OrthoPro; MicroStation v7; ArcGIS 9.3; Windows XP

Attribute Accuracy Report

Radiometry is verified by visual inspection of the digital orthophoto. Slight systematic radiometric differences may exist between adjacent orthoimage files; these are due primarily to differences in source image capture dates and sun angles along flight lines. These differences can be observed in an image's general lightness or darkness when it is compared to adjacent orthoimage file coverages. Tonal balancing may be performed over a group of images during the mosaicking process which may serve to lighten or darken adjacent images for better color tone matching.

Logical Consistency Report

All GeoTIFF tagged data and image file sizes are validated using commercial GIS software to ensure proper loading before being archived. This validation procedure ensures correct physical format and field values for tagged elements. Seamlines and tile edges are visually inspected. Seamline mismatches are not corrected unless the overall displacement exceeds one meter.

Completeness Report

Orthoimages are visually inspected for completeness to ensure that no gaps or image misplacements exist within and between adjacent images. These images are derived by mosaicking multiple images to ensure complete coverage. Source imagery is cloud free. Photography was flown during leaf-off in deciduous vegetation regions. Coastal areas and international boundary regions may have areas without images (void areas) in parts of the coverage. These void areas have a radiometric value of either zero (black) or 128 (uniform gray).

Horizontal Positional Accuracy Report

Ground Control Points of known and visible points were collected and measured.

Horizontal Positional Accuracy Value

1.67

Horizontal Positional Accuracy Explanation

Radial RMSE

Vertical Positional Accuracy Report

Digital Elevation Models (DEMs) used were National Elevation Dataset (NEDs).

Vertical Positional Accuracy Value

10 meter point spacing

Vertical Positional Accuracy Explanation

The DEMs are used as-is and were not modified.

Citation Information

Originator	JWSewall
Publication Date	Unpublished Material
Title	Aerial Photography
Geospatial Data Presentation Form	remote-sensing image

Type of Source Media

stable-base material

Beginning Date

20091108

Ending Date

20091117

Source Currentness Reference

ground condition

Source Citation Abbreviation

AIRPHOTO

Source Contribution

Remotely sensed imagery

Citation Information

Originator	JWSewall
Publication Date	Unpublished Material
Title	Scanned Imagery
Geospatial Data Presentation Form	raster digital data

Type of Source Media

Hard Drive

Calendar Date

200912

Source Currentness Reference

publication date

Source Citation Abbreviation

SCANS

Source Contribution

Scanned film files were orthorectified in order to create the orthophoto tiles.

Citation Information

Originator	JWSewall
Publication Date	Unpublished Material
Title	External Orientation
Geospatial Data Presentation Form	document

Type of Source Media

stable-base material

Calendar Date

200912

Source Currentness Reference

publication date

Source Citation Abbreviation

Source Contribution

External Orientation data was used to rectify scanned images.

Citation Information

Originator	JWSewall
Publication Date	Unpublished Material
Title	Ground Control Points

Type of Source Media

stable-based material

Calendar Date

200912

Source Currentness Reference

ground condition

Source Citation Abbreviation

GCP

Source Contribution

Ground control points were used to test accuracy of orthoimagery

Process Description

AIRPHOTOs were scanned to create SCANS. SCANS were orthorectified with EO data in order to create rectified frames. Seamlines were manually drawn to combine rectified frames for final mosaic tiles. GCP were used to check the tiles RMSE.

Process Date

200912

Process Description

Dataset copied.

Source Used Citation Abbreviation

U:\projects\metadata\WMS\Portland_133UA

Process Date

20100818

Process Time

10033700

Direct Spatial Reference Method

Raster

Grid Coordinate System Name

Universal Transverse Mercator

UTM Zone Number

Scale Factor at Central Meridian

0.9996

Longitude of Central Meridian

-69.0000

Latitude of Projection Origin

0.0

False Easting

500000

False Northing

0.0

Planar Coordinate Encoding Method

row and column

Abscissa Resolution

0.3

Ordinate Resolution

0.3

Planar Distance Units

meters

Horizontal Datum Name

North American Datum of 1983

Ellipsoid Name

Geodetic Reference System 80

Semi-major Axis

6378137

Denominator of Flattening Ratio

298.2572221

Entity and Attribute Overview

Natural color orthoimagery is organized in three color bands or channels which represent the red, green, and blue (RGB) portions of the spectrum. Each image pixel is assigned a triplet of numeric values, one for each color band. Numeric values range from 0 to 255. Areas where data is incomplete due to lack of full image coverage are represented with the numeric value of 0.

Entity and Attribute Detail Citation

U.S. Department of the Interior, U.S. Geological Survey, 1996, Standards for Digital Orthophotos: Reston, VA.

Entity and Attribute Overview

Entity and Attribute Detail Citation

U.S. Department of the Interior, U.S. Geological Survey, 1996, Standards for Digital Orthophotos: Reston, VA.

Contact Organization

Maine Office of GIS

Contact Position

GIS Coordinator

Address Type

mailing address

Address

State House Station #174

City

Augusta

State or Province

Maine

Postal Code

04333

Country

USA

Contact Voice Telephone

207-624-7700

Contact Facsimile Telephone

207-287-3842

Distribution Liability

Users must assume responsibility to determine the usability of this data for their purposes.

Format Name

WMS

Format Version Number

1.1

Format Specification

OpenGIS (OGC) Web Map Service (WMS)

[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.

Fees

None

Ordering Instructions

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

Metadata Reference Information

Metadata Date

20091218

Metadata Contact

Contact Organization	U.S. Geological Survey
Address Type	Mailing and physical address
Address	Customer Services
Address	U.S. Geological Survey
Address	EROS Data Center
Address	47914 252nd Street
City	Sioux Falls
State or Province	SD
Postal Code	57198-0001
Country	US
Contact Voice Telephone	1-800-252-4547
Contact TDD/TTY Telephone	1-605-594-6933
Contact Facsimile Telephone	1-605-594-6589
Contact Electronic Mail Address	custserv@usgs.gov
Hours of Service	Monday through Friday 8:00 AM to 4:00 PM (Central Time)
Contact Instructions	The above is the contact information for EROS Data Center in Sioux Falls, SD. This is the digital data storage and distribution center for the USGS. Metadata information can also be obtained through online services using The National Map Viewer, at http:/nationalmap.usgs.gov or EarthExplorer, at http://earthexplorer.usgs.gov.

Metadata Standard Name

FGDC Content Standard for Digital Geospatial Metadata

Metadata Standard Version

FGDC-STD-001-1998