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Hassi Bou Krechba region, Algeria, 1953, Army Map Service (AMS) NH 31-12 (Raster Image)
- Identification Information
- Data Quality Information
- Spatial Data Organization Information
- Spatial Reference Information
- Entity and Attribute Information
- Distribution Information
- Metadata Reference Information
- Identification Information
- Citation
- Originator
- United States. Army Map Service
- Originator
- Harvard University. Center for Geographic Analysis.
- Originator
- East View Cartographic, Inc.
- Publication Date
- 2009
- Title
- Hassi Bou Krechba region, Algeria, 1953, Army Map Service (AMS) NH 31-12 (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-ams-nh3112l
- Abstract
- This layer is a georeferenced raster image of the Army Map Service (AMS) Series P502, North Africa, 1:250,000 AMS Series sheet map entitled: Hassi Bou Krechba. Compilation date: 1953. Printed in: 1964. Covers portions of Hassi Bou Krechba region, Algeria. Map quadrangle number: NH 31-12. Edition statement: Ed. 1 - AMS. Compiled in 1953 from Carte du Sahara, 1:200,000, Institut Geographique National, Sheets NH 31-XI, NH 31-XII, 1921-28. 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 compilation dates (1951-1964) and editions, published by the Army Map Service. AMS Series P502 maps are in English. Each source map in the series is printed in color at a scale of 1:250,000. The source map was selected and downloaded from the University of Texas Libraries Web site by the Harvard University Center for Geographic Analysis (CGA) and georeferenced for the CGA's AfricaMap project by East View Cartographic. Individual AMS sheets covering a small portion of Africa (146 sheets in total) were selected from AMS series of: North Africa (P502), West Africa (G504), and South Africa (Z501). AMS Series maps are typical topographic maps portraying both natural and manmade features. They show and name works of nature, such as mountains, valleys, lakes, rivers, vegetation, etc. They also identify the principal works of humans, such as roads, railroads, boundaries, transmission lines, major buildings, etc. Relief is shown with standard contour intervals of 50 meters, with some sheets having supplemental meter contours, form lines, hachures, shading, and/or spot heights. Depths shown by bathymetric isolines. Please pay close attention to map collar information on projections, spheroid, planimetric revision methods and dates, and keys to grid numbering and other numbers which appear inside the neatline.
- Purpose
- Historic topographic paper maps can provide an excellent view of the changes that have occurred in the cultural and physical landscape. 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 compilation date
- Time Instant
- 1953
- Bounding Box
- West
- 4.387075
- East
- 6.327826
- North
- 30.108309
- South
- 28.786622
- Theme Keyword
- Maps, Topographic
- Land use
- Infrastructure (Economics)
- Human settlements
- Bodies of water
- Landforms
- Transportation
- Theme Keyword Thesaurus
- LCSH
- ISO Topic Category
- imageryBaseMapsEarthCover
- Place Keyword
- Algeria
- Bou Khechba, Hassi
- 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
- Credit
- Image source: Courtesy of the University of Texas Libraries, The University of Texas at Austin.
- 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. With AMS sheets: Road classification should be referred to with caution. Relief data is not always complete. International boundaries are not considered authoritative. Names for symbolized populated places are omitted where information is not available or where density of detail does not permit their inclusion. Some sheets in the series include a reliability diagram in the collar detailing sources and methods used to compile data, reliability by geography, and areas for which vegetation information is available.
- 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.
- 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 47.8965 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
- United States. Army Map Service
- Publication Date
- 196405
- Title
- Hassi Bou Krechba
- Edition
- Ed. 1 - AMS
- Geospatial Data Presentation Form
- map
- Collection Title
- North Africa 1:250,000
- Series Information
- Series Name
- AMS
- Issue Identification
- NH 31-12
- Publication Information
- Publication Place
- Washington, DC
- Publisher
- Army Map Service
- Source Scale Denominator
- 250000
- Type of Source Media
- paper
- Source Temporal Extent
- Time Period Information
- Single Date/Time
- Calendar Date
- 1953
- 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
- 3986
- Column Count
- 5853
- 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
- JPEG2000
- Distributor
- Harvard University Library
- Online Access
- http://hgl.harvard.edu/
- Name
- Metadata Reference Information
- Metadata Date
- 20090728
- 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
