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Agalega Islands, Mauritius, 1984, Tactical Pilotage Chart (TPC) N-7A (Raster Image)

Identification Information
Citation
Originator
Aerospace Center (U.S.)
Originator
United States. National Imagery and Mapping Agency.
Originator
United States. Defense Mapping Agency.
Originator
Harvard University. Center for Geographic Analysis.
Originator
East View Cartographic, Inc.
Publication Date
2009
Title
Agalega Islands, Mauritius, 1984, Tactical Pilotage Chart (TPC) N-7A (Raster Image)
Geospatial Data Presentation Form
map
Publication Information
Publication Place
Cambridge, Massachusetts
Publisher
Harvard Map Collection, Harvard College Library
Online Linkage
https://hgl.harvard.edu/catalog/harvard-am-tpc-n07al
Abstract
This layer is a georeferenced raster image of the United States Aerospace Center's Tactical Pilotage Chart (TPC) 1:500,000 map series sheet entitled: TPC N-7A : Agalega Islands. Edition: 1. Revision date: 1984. Printed in: 1987. Covers all or portions of: Agalega Islands, Mauritius. The image inside the map neatline is georeferenced to the surface of the earth and fit to World Geodetic System (1984) coordinates. All map collar information is also available as part of the raster image. Series source sheets are of varying revision dates (1973-2001) and editions, published by the U.S. Defense Mapping Agency/U.S. National Imagery and Mapping Agency (later the National Geospatial-Intelligence Agency). Some sheets published by the UK Ministry of Defence (later the Defence Geographic and Imagery Intelligence Agency). The source map was scanned and georeferenced for Harvard University's Center for Geographic Analysis' AfricaMap project by East View Cartographic. Individual TPC sheets covering a large portion of Africa (137 sheets in total) were selected from the worldwide TPC series. The Tactical Pilotage Chart (TPC) is the standard worldwide medium-scale aeronautical chart series. The TPC and other aeronautical navigation and planning charts provide essential cartographic data appropriate to scale, and are overprinted with stable aeronautical information such as obstructions, aerodromes, special use airspace, navigational aids, Maximum Elevation Figures (MEFs), and related data. TPC's also show selected topographic, cultural and hydrographic features such as: city outlines, towns and villages, rivers, lakes, landmark features (labeled), roads, railroads, towers, transmission lines, other landmarks, vegetation areas, clearings, and more. Ground elevation is indicated by contours (500-foot intervals with intermediate contours shown at 250 feet), shading, tints, and spot heights. Please pay close attention to map collar information for original projection information, keys and legends to grid and chart numbering and other numbers, elevations, aeronautical information, vertical obstacles, ground cover, cultural features, and other data which appear inside the neatline.
Purpose
TPC's are designed for very low-altitude (below 500 feet above ground level) through medium-altitude high-speed visual and radar navigation. Also used for mission planning/analysis and intelligence briefings, and are source for navigational filmstrips, special purpose, and cockpit/visual display products. The wide range of information provided on these maps make them useful in the study of historic geography, and urban and rural land use change. As this map has been georeferenced, it can be used in a GIS as a source or background layer in conjunction with other GIS data.
Temporal Extent
Currentness Reference
source map ground condition
Time Instant
1984
Bounding Box
West
53.483349
East
60.157890
North
-7.743669
South
-12.529009
Theme Keyword
Maps
Aeronautical charts
Landforms
Bodies of water
Human settlements
Land use
Infrastructure
Transportation
Theme Keyword Thesaurus
LCSH
ISO Topic Category
imageryBaseMapsEarthCover
transportation
Place Keyword
Mauritius
Agalega Islands
Place Keyword Thesaurus
GNS
Temporal Keyword
Access Restrictions
None
Use Restrictions
For educational, non-commercial use only.
Status
Complete
Maintenance and Update Frequency
None planned
Point of Contact
Contact Organization
Center for Geographic Analysis
Delivery Point
Harvard University
Delivery Point
CGIS K-00A
Delivery Point
CGIS Knafel Building
Delivery Point
1737 Cambridge St.
City
Cambridge
State
MA
Postal Code
02138
Country
USA
Contact Electronic Mail Address
contact@help.cga.harvard.edu
Native Data Set Environment
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 9.0.0.535
Data Quality Information
Attribute Accuracy Report
The georeferenced raster is a faithfully reproduced digital image of the original source map. Some differences may be detected between the source graphic used and the raster image due to the RGB values assigned that particular color. The intent is to recreate those colors as near as possible. In regard to the source maps: The representation of boundaries are not necessarily authoritative.
Logical Consistency Report
Not applicable.
Completeness Report
Data completeness for raster image files reflect content of the source graphic. Features may have been eliminated or generalized on the source graphic due to scale and legibility constraints. For instance with TPCs because of scale, some features, including obstructions, are generalized in developed regions (only the highest obstruction within ticked area or urban quadrant is shown).
Horizontal Positional Accuracy Report
The horizontal positional accuracy of a raster image is approximately the same as the accuracy of the published source map. The lack of a greater accuracy is largely the result of the inaccuracies with the original measurements and possible distortions in the original paper map document. There may also be errors introduced during the digitizing and georeferencing process. In most cases, however, errors in the raster image are small compared with sources of error in the original map graphic. While the data of the published map is retained in the georeferenced image, the image is referenced to the World Geographic Reference 1984 system, which is inconsistent with the original projection of the paper map, and may lead to discrepancies in the horizontal accuracy of the raster image. The Root Mean Square (RMS) error for this map is 52.8396 meters. This value describes how consistent the transformation is between the different control points (links). The RMS error is only an assessment of the accuracy of the transformation.
Quantitative Horizontal Positional Accuracy Assessment
Lineage
Source
Originator
Aerospace Center (U.S.)
Originator
United States. National Imagery and Mapping Agency.
Originator
United States. Defense Mapping Agency.
Publication Date
1987
Title
TPC N-7A : Agalega Islands
Edition
Ed. 1
Geospatial Data Presentation Form
map
Collection Title
Tactical Pilotage Charts, TPC, [Africa]
Series Information
Series Name
TPC
Issue Identification
N-7A
Publication Information
Publication Place
St. Louis, Mo.
Publisher
U.S. Aerospace Center, Defense Mapping Agency
Source Scale Denominator
500000
Type of Source Media
paper
Source Temporal Extent
Time Period Information
Single Date/Time
Calendar Date
1984
Source Currentness Reference
ground condition
Contribution
Original map was scanned and georeferencing.
Spatial Data Organization Information
Direct Spatial Reference Method
Raster
Raster Object Information
Raster Object Type
Pixel
Row Count
16581
Column Count
23127
Vertical Count
1
Spatial Reference Information
Horizontal Coordinate System Definition
Geographic
Latitude Resolution
0.000001
Longitude Resolution
0.000001
Geographic Coordinate Units
Decimal degrees
Geodetic Model
Horizontal Datum Name
D_WGS_1984
Ellipsoid Name
WGS_1984
Semi-major Axis
6378137.000000
Denominator of Flattening Ratio
298.257224
Entity and Attribute Information
Entity and Attribute Overview
The indexes reference a color palette of RGB values from 0 through 255, representing the color value from the original paper sheet map. The colors on that sheet represent relief, drainage, vegetation, populated places, cultural features, coastal hydrography, transportation features (roads, railroads, tracks and trails), spot elevations and national and international boundaries. The colors are explained in a legend that is incorporated into the map collar.
Entity and Attribute Detail Citation
Not applicable.
Distribution Information
Format Name
GeoTIFF
Distributor
Harvard University Library
Online Access
http://hgl.harvard.edu/
Name
Metadata Reference Information
Metadata Date
20090702
Metadata Contact
Contact Information
Contact Organization Primary
Contact Organization
Harvard Geospatial Library
Contact Position
Geospatial Resources Cataloger
Contact Address
Address
Harvard University Library
Address
Office For Information Systems
Address
90 Mount Auburn Street
City
Cambridge
State or Province
MA
Postal Code
02138
Country
USA
Contact Voice Telephone
617-495-2417
Contact Facsimile Telephone
617-496-0440
Contact Electronic Mail Address
hgl_ref@hulmail.harvard.edu
Hours of Service
Monday - Friday, 9:00 am - 4:00 pm EST-USA
Metadata Standard Name
FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version
FGDC-STD-001-1998
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