Connecticut 2004 Aerial Photo Center Point Index

+ Resource Description

Citation

Information used to reference the data.

Title: Connecticut 2004 Aerial Photo Center Point Index

Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)

State of Connecticut, Department of Transportation (data publisher)

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut, USA

Publication date: 20060821

Data type: vector digital data

Data location: http://www.ct.gov/deep

Description

A characterization of the data, including its intended use and limitations.

Abstract:

Connecticut 2004 Aerial Photo Center Point Index is a point feature class that defines the center point for each Connecticut 2004 orthophoto image tile. There are 3,413 orthophoto tiles and these data include a center point for each orthophoto tile. Each tile measures approximately 1.17 miles east-west by 1.5 miles north-south, covering a geographic area of approximately 1.755 square miles. The orthophotos are organized in a grid pattern that covers the State of Connecticut with 36 orthophoto tiles per 7.5 minute quadrangle area (9 per 3.75 minute quarter quadrangle area). The overlap between adjacent photos is approximately 350 to 450 feet. Each center point feature is identified by a unique ORTHOPHOTO_TILE value, which matches the name of the corresponding image file.

Purpose:

These data serve as a center point index to the set of 2004 orthophoto image tiles for Connecticut.

Language of dataset: en

Point Of Contact

Contact information for the individual or organization that is knowledgeable about the data.

Organization: State of Connecticut, Department of Environmental Protection

Person: Howie Sternberg

Phone: 860-424-3540

Fax: 860-424-4058

Email: dep.gisdata@ct.gov

Hours of service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time

Address type: mailing and physical address

Address:

79 Elm Street

City: Hartford

State or Province: Connecticut

Postal code: 06106-5127

Country: USA

Data Type

How the data are represented, formatted and maintained by the data producing organization.

File or table name: depgis.DEP.PHOTO_INDEX_2004

Data type: vector digital data

Data format: SDE Feature Class

Native dataset environment: These data are maintained by the State of Connecticut using ArcGIS software developed by Environmental Systems Research Institute (ESRI) in a Microsoft Windows operating system environment.

Time Period of Data

Time period(s) for which the data corresponds to the currentness reference.

Date: 2004

Currentness reference:

Date of photography

Status

The state of and maintenance information for the data.

Data status: Complete

Update frequency: None planned

Key Words

Words or phrases that summarize certain aspects of the data.

Theme:

Keywords: imageryBaseMapsEarthCover

Keyword thesaurus: ISO 19115 Topic Category

Theme:

Keywords: aerial photo index, 2004

Keyword thesaurus: None

Place:

Keywords: Connecticut, CT

Keyword thesaurus: 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 5-2): Washington, DC, National Institute of Standards and Technology.

Place:

Keywords: United States of America, USA

Keyword thesaurus: 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.

Data Access Constraints

Restrictions and legal prerequisites for accessing or using the data after access is granted.

Access constraints:

None. No restrictions or legal prerequisites for accessing the data. The data is in the public domain and may be redistributed.

Use constraints:

None. No restrictions or legal prerequisites for using the data after access is granted. The data is suitable for use at appropriate scale. When printing this data on a map or using it in a software application, analysis, or report, please acknowledge the State of Connecticut, Departments of Environmental Protection and Transportation as the source for this information. For example, include the following data source description when printing this layer on a map: Photo centers - From the Connecticut 2004 Aerial Photo Center Point Index layer, published by CT DEP and CT DOT.

Data Security Information

Handling restrictions imposed on the data because of national security, privacy or other concerns.

Security classifiction system: None

Security classification: None

Security handling: No restrictions for handling the data.

+ Graphic Example

Browse Graphic

Graphic illustration of the data.

Browse graphic 1

Open - Full view of 2004 Photo Index

Browse graphic 2

Open - Detail view of 2004 Photo Index labeled with flight line and photo ID values.

+ Spatial Reference Information

Horizontal Coordinate System

Reference system from which linear or angular quantities are measured and assigned to the position that a point occupies.

Projected coordinate system:

Name: NAD 1983 StatePlane Connecticut FIPS 0600 Feet

Map units: survey feet

Geographic coordinate system:

Name: GCS North American 1983

Coordinate System Details

Map projection

Map projection name: Lambert Conformal Conic

Standard parallel: 41.200000

Standard parallel: 41.866667

Longitude of central meridian: -72.750000

Latitude of projection origin: 40.833333

False easting: 999999.999996

False northing: 499999.999998

Planar Coordinate Information

Planar coordinate encoding method: coordinate pair

Coordinate representation:

Abscissa resolution: 0.000250

Ordinate resolution: 0.000250

Planar distance units: survey feet

Geodetic model

Horizontal datum name: North American Datum of 1983

Ellipsoid name: Geodetic Reference System 80

Semi-major axis: 6378137.000000

Denominator of flattening ratio: 298.257222

Vertical Coordinate System

Reference system from which vertical distances (altitudes or depths) are measured.

Altitude system definition:

Altitude resolution: 1.000000

Altitude encoding method: Explicit elevation coordinate included with horizontal coordinates

Spatial Domain

The geographic areal domain of the data that describes the western, eastern, northern, and southern geographic limits of data coverage.

Bounding Coordinates

In Projected or local coordinates

NAD 1983 StatePlane Connecticut FIPS 0600 Feet

Boundary	Coordinate
Left	732920.600000 (survey feet)
Right	1265493.279000 (survey feet)
Top	945687.907000 (survey feet)
Bottom	550532.699000 (survey feet)

In Unprojected coordinates (geographic)

GCS North American 1983

Boundary	Coordinate
West	-73.733365 (longitude)
East	-71.772475 (longitude)
North	42.056478 (latitude)
South	40.967921 (latitude)

+ Data Structure and Attribute Information

Overview

Summary of the information content of the data, including other references to complete descriptions of entity types, attributes, and attribute values for the data.

Entity and attribute overview:

Information encoded about photo center point features includes the name of the corresponding orthophoto image tile (ORTHOPHOTO_TILE) and identification of the quadrangle number (QUAD_NO), quadrangle name (QUADRANGLE) and quadrangle section (QUAD_SEC) the orthophoto is located on. A point feature is located in the center of each tile area.

Direct spatial reference method: Vector

Indirect spatial reference method: The FLIGHTLINE_PHOTO_NO attribute value (e.g. 050-01) identifies a point feature representing the center location of the photograph.

Attributes of Connecticut 2004 Aerial Photo Center Point Index

Detailed descriptions of entity type, attributes, and attribute values for the data.

Name: depgis.DEP.PHOTO_INDEX_2004

Type of object: Feature Class

Geometry type: Point

Number of records: 4418

Description:

Orthophoto tile center points. One point per tile.

Source:

State of Connecticut, Department of Environmental Protection

Attributes

OBJECTID

Definition:

Internal feature number.

Alias: OBJECTID Type: OID Width: 4 Precision: 10 Scale: 0

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

Attribute definition source:

ESRI

SHAPE

Definition:

Feature geometry.

Alias: SHAPE Type: Geometry Width: 4 Precision: 0 Scale: 0

Attribute values: Coordinates defining the features.

Attribute definition source:

ESRI

ORTHOPHOTO_TILE

Alias: ORTHOPHOTO_TILE Type: String Width: 255 Precision: 0 Scale: 0

FLIGHTLINE_PHOTO_NO

Alias: FLIGHTLINE_PHOTO_NO Type: String Width: 255 Precision: 0 Scale: 0

EASTING

Alias: EASTING Type: Double Width: 8 Precision: 16 Scale: 5

NORTHING

Alias: NORTHING Type: Double Width: 8 Precision: 16 Scale: 5

ELEVATION

Alias: ELEVATION Type: Double Width: 8 Precision: 16 Scale: 5

PHOTO_DATE

Alias: PHOTO_DATE Type: Date Width: 36 Precision: 0 Scale: 0

PHOTO_TIME

Alias: PHOTO_TIME Type: Date Width: 36 Precision: 0 Scale: 0

ESRI Feature Description

Description of spatial objects in the data using the Environmental Systems Research Institute (ESRI) terminology.

Environmental Systems Research Institute (ESRI) terms

depgis.DEP.PHOTO_INDEX_2004

ESRI feature type: Simple

Geometry type: Point

Topology: FALSE

Feature count: 4418

Spatial index: TRUE

Linear referencing: FALSE

SDTS Feature Description

Description of point and vector spatial objects in the data using the Spatial Data Transfer Standards (SDTS) terminology.

Spatial data transfer standard (SDTS) terms

depgis.DEP.PHOTO_INDEX_2004

Type: Entity point

Count: 4418

+ Data Quality and Accuracy Information

General

Information about the fidelity of relationships, data quality and accuracy tests, omissions, selection criteria, generalization, and definitions used to derive the data.

Logical consistency report:

Point features conform to the following topological rules. Points are single part. There are no duplicate points. Points do not overlap. Establishment of logical consistency was performed by the State of Connecticut, Department of Environmental Protection using ESRI ArcGIS software to derive these center point features from a photo index in CAD format supplied by the State of Connecticut, Department of Transportation. No automated procedures or tests were performed to guarantee desired topology other than visual inspection.

Completeness report:

The completeness of the data reflects the feature content of the data sources, which is photo index for the 2004 orthophotos in CAD format from the State of Connecticut, Department of Transportation.

Attribute Accuracy

Accuracy of the identification of data entities, features and assignment of attribute values.

Attribute accuracy report:

All attributes have valid values. Values are within defined domains. No rigid attribute accuracy tests were conducted. However, assignment of quadrangle number, quadrangle name, and quadrangle section values were conducted through spatial joins with previously quality checked quadrangle and quarter quadrangle index spatial data, followed by a visual inspection for expected results to ensure overall accuracy.

Positional Accuracy

Accuracy of the positional aspects of the data.

Horizontal accuracy report:

The horizontal positional accuracy of this data is unknown.

+ Data Source and Process Information

Data Sources

Information about the source data used to construct or derive the data.

Data source information

Source 1 - index_v8_3d.dgn

Title: Orthophoto Tile index in CAD format

Originators: State of Connecticut, Department of Transportation (data publisher)

Publisher: State of Connecticut, Department of Transportation

Publication place: Hartford, Connecticut, USA

Publication date: 2006

Data type: vector digital data

Map scale denominator: unknown

Media: disc

Date: 2004

Currentness reference:

Date of photography

Source 2 - Quarter_Quadrangle_Index_NAD83_Area.shp

Title: USGS 3.75 Minute Quarter Quadrangle Index

Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut, USA

Publication date: 1995

Edition: 2005

Data type: vector digital data

Data location: http://www.ct.gov/deep

Map scale denominator: 24000

Media: disc

Source contribution:

Quarter_Quadrangle_Index_NAD83_Area.shp is in ESRI Shapefile format with polygon features.

Date: 1995

Currentness reference:

publication date

Source 3 - Photo_Index_2004

Title: Connecticut 2004 Aerial Photo Center Point Index

Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)

State of Connecticut, Department of Transportation (data publisher)

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut, USA

Publication date: 20070216

Data type: vector digital data

Data location: http://www.ct.gov/deep

Map scale denominator: unknown

Media: disc

Source contribution:

These data serve as a center point index to the set of 2004 orthophoto image tiles for Connecticut.

Date: 2004

Currentness reference:

Date of photography

Process Steps

Information about events, parameters, tolerances and techniques applied to construct or derive the data.

Process step information

Process Step 1

Process description:

Orthophoto tile boundary information in CAD format from the State of Connecticut Department of Transportation (source 1) was used as the basis for creating a center point feature for each orthophoto tile. Attributes such as ORTHOPHOTO_TILE were transferred from the polygon data in CAD format to individual point features. Additional center point attribute information such as quadrangle number, quadrangle name, and quadrangle section values were subsequently determined and assigned to individual point features through spatial joins with quarter quadrangle index spatial data published by the State of Connecticut, Department of Environmental Protection (source 2). The resulting point feature class was named Ortho_2004_Index_Point (source 3).

Organization: State of Connecticut, Department of Environmental Protection

Person: Deborah Dumin, Jackie Mickiewicz, Howie Sternberg

Phone: 860-424-3540

Fax: 860-424-4058

Address type: mailing and physical address

Address:

79 Elm Street

City: Hartford

State or Province: Connecticut

Postal code: 06106

Country: USA

Process date: 2005-2006

Process software and version: ArcGIS 9.1

Data Source used

Source 1 - index_v8_3d.dgn

Title: Orthophoto Tile index in CAD format

Originators: State of Connecticut, Department of Transportation (data publisher)

Publisher: State of Connecticut, Department of Transportation

Publication place: Hartford, Connecticut, USA

Publication date: 2006

Data type: vector digital data

Map scale denominator: unknown

Media: disc

Date: 2004

Currentness reference:

Date of photography

Source 2 - Quarter_Quadrangle_Index_NAD83_Area.shp

Title: USGS 3.75 Minute Quarter Quadrangle Index

Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut, USA

Publication date: 1995

Edition: 2005

Data type: vector digital data

Data location: http://www.ct.gov/deep

Map scale denominator: 24000

Media: disc

Source contribution:

Quarter_Quadrangle_Index_NAD83_Area.shp is in ESRI Shapefile format with polygon features.

Date: 1995

Currentness reference:

publication date

Data Source produced

Source 3 - Photo_Index_2004

Title: Connecticut 2004 Aerial Photo Center Point Index

Originators: State of Connecticut, Department of Environmental Protection (data editor and publisher)

State of Connecticut, Department of Transportation (data publisher)

Publisher: State of Connecticut, Department of Environmental Protection

Publication place: Hartford, Connecticut, USA

Publication date: 20070216

Data type: vector digital data

Data location: http://www.ct.gov/deep

Map scale denominator: unknown

Media: disc

Source contribution:

These data serve as a center point index to the set of 2004 orthophoto image tiles for Connecticut.

Date: 2004

Currentness reference:

Date of photography

ESRI geoprocessing history

Description of ESRI geoprocessing commands, settings, and tolerances applied to the data.

ESRI geoprocessing command information

1 Process

Date: 20070411 Time: 101142

Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\Data Management Tools.tbx\CopyFeatures

Command issued: CopyFeatures R:\Archive\tile_index\geodatabase\Tile_Index.mdb\Photo_Index_2004 "Database Connections\depdbs11.depgis@DEP.sde\depgis.DEP.Photo_Index_2004" DEPVECTORSTATIC 0 0 0

2 CopyFeatures_37

Date: 20081215 Time: 161711

Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\Data Management Tools.tbx\CopyFeatures

Command issued: CopyFeatures "Database Connections\10.18.8.94.depgis@DEP.sde\depgis.DEP.PHOTO_INDEX_2004" "Database Connections\062174-svr.depgis@DEP.sde\depgis.DEP.PHOTO_INDEX_2004" DEPFEATUREDYNAMIC 0 0 0

+ Data Distribution Information

General

Description of the data known by the party from whom the data may be obtained, liability of party distributing data, and technical capabilities required to use the data.

Resource description:

Connecticut 2004 Aerial Photo Center Point Index

Distribution liability:

Although these data have been used by the State of Connecticut no warranty, expressed or implied, is made by the State of Connecticut as to the accuracy of the data and or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the State of Connecticut in the use of these data or related materials. The user assumes the entire risk related to the use of these data. Once the data is distributed to the user, modifications made to the data by the user should be noted in the metadata.

Technical prerequisites:

Geographic information sytem (GIS), computer-aided drawing or other mapping software is necessary to display, view and access the information.

Distribution Point of Contact

Contact information for the individual or organization distributing the data.

Organization: State of Connecticut, Department of Enviromental Protection

Phone: 860-424-3540

Fax: 860-424-4058

Email: dep.gisdata@ct.gov

Hours of service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time

Address type: mailing and physical address

Address:

79 Elm Street

City: Hartford

State or Province: Connecticut

Postal code: 06106-5127

Country: USA

Standard Order Process

Common ways in which data may be obtained.

Digital form:

Format name: Shapefile, Feature Class

Format version number: ArcGIS

File decompression technique: Zip file

Digital transfer option:

Online option:

Computer information:

Network address:

Network resource name: http://www.ct.gov/deep

Fees: An online copy of the data may be accessed without charge.

Custom Order Process

Description of custom distribution services available.

Custom order process:

The data distributor does not provide custom GIS analysis or mapping services. Data is available in a standard format and may be converted to other formats, projections, coordinate systems, or selected for specific geographic regions by the party receiving the data.

+ Metadata Reference

Metadata Date

Dates associated with creating, updating and reviewing the metadata.

Last updated: 20111208

Language of metadata: en

Metadata Point of Contact

Contact information for the individual or organization responsible for the metadata information.

Organization: State of Connecticut, Department of Environmental Protection

Person: Howie Sternberg

Phone: 860-424-3540

Fax: 860-424-4058

Email: dep.gisdata@ct.gov

Hours of service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time

Address type: mailing and physical address

Address:

79 Elm Street

City: Hartford

State or Province: Connecticut

Postal code: 06106-5127

Country: USA

Metadata Access Constraints

Restrictions and legal prerequisites for accessing or using the data after access is granted.

Access constraints:

None. No restrictions or legal prerequisites for accessing the metadata.

Use constraints:

None. No restrictions or legal prerequisites for using the metadata after access is granted.

Metadata Security Information

Handling restrictions imposed on the metadata because of national security, privacy or other concerns.

Security classifiction system: None

Security classification: None

Security handling: No restrictions for handling the metadata.

Metadata Standards

Description of the metadata standard used to document the data and reference to any additional extended profiles to the standard used by the metadata producer.

Standard name: FGDC Content Standards for Digital Geospatial Metadata

Standard version: FGDC-STD-001-1998

Time convention: local time

Metadata profiles defining additonal information:

Profile: ESRI Metadata Profile

Online linkage: http://www.esri.com/metadata/esriprof80.html

FGDC Plus Metadata Stylesheet

Stylesheet: FGDC Plus Stylesheet

File name: FGDC Plus.xsl

Version: 2.2

Description: This metadata is displayed using the FGDC Plus Stylesheet, which is an XSL template that can be used with ArcGIS software to display metadata. It displays metadata elements defined in the Content Standard for Digital Geospatial Metadata (CSDGM) - aka FGDC Standard, the ESRI Profile of CSDGM, the Biological Data Profile of CSDGM, and the Shoreline Data Profile of CSDGM. CSDGM is the US Federal Metadata standard. The Federal Geographic Data Committee originally adopted the CSDGM in 1994 and revised it in 1998. According to Executive Order 12096 all Federal agencies are ordered to use this standard to document geospatial data created as of January, 1995. The standard is often referred to as the FGDC Metadata Standard and has been implemented beyond the federal level with State and local governments adopting the metadata standard as well. The Biological Data Profile broadens the application of the CSDGM so that it is more easily applied to biological data that are not explicitly geographic (laboratory results, field notes, specimen collections, research reports) but can be associated with a geographic location. Includes taxonomical vocabulary. The Shoreline Data Profile addresses variability in the definition and mapping of shorelines by providing a standardized set of terms and data elements required to support metadata for shoreline and coastal data sets. The FGDC Plus Stylesheet includes the Dublin Core Metadata Element Set. It supports W3C DOM compatible browsers such as IE7, IE6, Netscape 7, and Mozilla Firefox. It is in the public domain and may be freely used, modified, and redistributed. It is provided "AS-IS" without warranty or technical support.

Instructions: On the top of the page, click on the title of the dataset to toggle opening and closing of all metadata content sections or click section links listed horizontally below the title to open individual sections. Click on a section name (e.g. Description) to open and close section content. Within a section, click on a item name (Status, Key Words, etc.) to open and close individual content items. By default, the Citation information within the Description section is always open for display.

Download: FGDC Plus Stylesheet is available from the ArcScripts downloads at www.esri.com.