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AMS China : Ch'ang-sha Region (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
- Harvard Map Collection, Harvard College Library
- Publication Date
- 200501
- Title
- AMS China : Ch'ang-sha Region (Raster Image)
- Geospatial Data Presentation Form
- map
- Online Linkage
- https://hgl.harvard.edu/catalog/harvard-ams7810-s250-u54-nh49-16
- Abstract
- This layer is a georeferenced raster image of the Army Map Service (AMS) Series L500, China 1:250,000 topographic map of the Ch'ang-sha (Langli) region of China. Map quadrangle number: NH49-16. Edition statement: AMS - ed. 1. Printed in January 1958; the source map was compiled in 1953 from the best available large scale maps of China. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Universal Transverse Mercator projection. All map collar information is also available as part of the raster image. AMS Series L500 topographic maps were prepared and printed by the AMS, US Army Corps of Engineers in the 1950s and 1960s. AMS Series L500 maps are in English, with modified Wade-Giles romanized Chinese place and feature names; many names also appear as Chinese ideographs. Each source map in the series is printed in color at a scale of 1:250,000. AMS Series L500 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 100 meters, with some sheets having supplemental 50 meter contours, form lines, and/or spot heights. 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.
- Supplemental Information
- Please note that the map title is an outdated (Wade-Giles romanization) spelling of the Chinese place or feature name for which the map is named. Both this outdated version and the current pinyin romanization version appear as place keywords in this metadata record.
- Temporal Extent
- Currentness Reference
- compilation date
- Time Instant
- 1953
- Bounding Box
- West
- 112.347781
- East
- 114.336277
- North
- 29.125597
- South
- 27.755775
- ISO Topic Category
- imageryBaseMapsEarthCover
- Theme Keyword
- Maps, Topographic
- Land use
- Infrastructure
- Human settlements
- Bodies of water
- Landforms
- Theme Keyword Thesaurus
- LCSH
- ISO Topic Category
- imageryBaseMapsEarthCover
- Place Keyword
- China
- Ch'ang-sha
- Langli
- Hunan Sheng
- Hunan Province
- Jiangxi Sheng
- Changsa
- Jiangxi Province
- Place Keyword Thesaurus
- None
- 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
- Harvard Map Collection, Harvard College Library
- Delivery Point
- Harvard Map Collection
- Delivery Point
- Pusey Library
- Delivery Point
- Harvard University
- City
- Cambridge
- State
- MA
- Postal Code
- 02138
- Country
- USA
- Contact 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
- Credit
- Harvard Map Collection, Harvard College Library
- Native Data Set Environment
- Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 9.1.0.722
- Data Quality Information
- Attribute Accuracy Report
- This raster image is a 24-bit per pixel color image that employs a color palette to ensure uniform colors throughout the series. All raster images within the series have the same RGB value. In regards to the source maps: Road classification should be referred to with caution. Vegetation information is generally unreliable on many of these maps and the delineation of international boundaries is not considered authoritative. Each sheet in the series includes also 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
- 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. 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 positional accuracy of the original map was largely preserved during the digitizing and georeferencing processes. Accuracy may be generally characterized as possessing the highest standards of accuracy given the general survey, instrumentation, design and printing technologies and cartographic techniques available during the time the original map was produced. The original map was scanned and georeferenced (SEE: Process Steps) to produce this digital version. While the data of the published map is retained in the georeferenced image, the image is referenced to the Universal Transverse Mercator coordinate 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 standard used for georeferencing the image to the UTM coordinates was an RMS error below 50 meters. See the process steps for the actual RMS error achieved.
- Lineage
- Source
- Originator
- United States. Army Map Service
- Publication Date
- 195801
- Title
- Ch'ang-sha
- Edition
- Ed. 1 - AMS
- Geospatial Data Presentation Form
- map
- Collection Title
- China, 1:250,000
- Series Information
- Series Name
- Series L500
- Issue Identification
- NH49-16
- Publication Information
- Publication Place
- Washington, D.C.
- Publisher
- United States. Army Map Service
- Other Citation Details
- Publication date is taken from the date of printing on the map.
- Source Scale Denominator
- 250000
- Type of Source Media
- paper
- Source Temporal Extent
- Time Period Information
- Single Date/Time
- Calendar Date
- 195801
- Source Currentness Reference
- publication date
- Contribution
- Original map was scanned and digitized in preparation for georeferencing.
- Source
- Originator
- Harvard Map Collection
- Publication Date
- 200412
- Title
- AMS Topographic Map (Digitized Version)
- Geospatial Data Presentation Form
- map
- Source Scale Denominator
- 250000
- Type of Source Media
- online
- Source Temporal Extent
- Time Period Information
- Single Date/Time
- Calendar Date
- 200412
- Source Currentness Reference
- publication date
- Contribution
- The digitized version of the AMS Topo Map was georeferenced and a world file (.tfw) was created.
- Spatial Data Organization Information
- Direct Spatial Reference Method
- Raster
- Raster Object Information
- Raster Object Type
- Pixel
- Row Count
- 6766
- Column Count
- 8860
- Vertical Count
- 1
- Spatial Reference Information
- Horizontal Coordinate System Definition
- Planar
- Grid Coordinate System
- Grid Coordinate System Name
- Universal Transverse Mercator
- Universal Transverse Mercator
- UTM Zone Number
- 49
- Transverse Mercator
- Scale Factor at Central Meridian
- 0.999600
- Longitude of Central Meridian
- 111.000000
- Latitude of Projection Origin
- 0.000000
- False Easting
- 500000.000000
- False Northing
- 0.000000
- Planar Coordinate Information
- Planar Coordinate Encoding Method
- row and column
- Coordinate Representation
- Abscissa Resolution
- 21.668564
- Ordinate Resolution
- 21.899249
- Planar Distance Units
- meters
- 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
- TIFF
- Distributor
- Harvard Geospatial Library
- Online Access
- http://hgl.harvard.edu/
- Name
- Metadata Reference Information
- Metadata Date
- 20051018
- 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
- 1280 Massachusetts Avenue
- 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
- Metadata Extensions
- Online Linkage
- http://www.esri.com/metadata/esriprof80.html
- Profile Name
- ESRI Metadata Profile
