{"status":"OK","data":{"id":23473,"identifier":"YVRAF","persistentUrl":"https://hdl.handle.net/1902.6/YVRAF","protocol":"hdl","authority":"1902.6","separator":"/","publisher":"Harvard Dataverse","publicationDate":"2011-12-13","storageIdentifier":"file://1902.6/YVRAF","effectiveDatasetFileCountLimit":100000,"datasetFileUploadsAvailable":99999,"datasetType":"dataset","locks":[],"latestVersion":{"id":19473,"datasetId":23473,"datasetPersistentId":"hdl:1902.6/YVRAF","datasetType":"dataset","storageIdentifier":"file://1902.6/YVRAF","versionNumber":1,"internalVersionNumber":1,"versionMinorNumber":0,"versionState":"RELEASED","latestVersionPublishingState":"RELEASED","deaccessionLink":"","productionDate":"","lastUpdateTime":"2011-12-13T18:19:55Z","releaseTime":"2011-12-13T00:00:00Z","createTime":"2011-02-20T13:00:16Z","publicationDate":"2011-12-13","citationDate":"2011-12-13","effectiveDatasetFileCountLimit":100000,"datasetFileUploadsAvailable":99999,"termsOfUse":"This dataset is made available with limited information on how it can be used. You may wish to communicate with the Contact(s) specified before use.","specialPermissions":"None","restrictions":"None","fileAccessRequest":false,"metadataBlocks":{"citation":{"displayName":"Citation Metadata","name":"citation","fields":[{"typeName":"title","multiple":false,"typeClass":"primitive","value":"Boston, Massachusetts Region 1:5,000 Color Ortho Imagery (1/2-meter Resolution), 2001"},{"typeName":"author","multiple":true,"typeClass":"compound","value":[{"authorName":{"typeName":"authorName","multiple":false,"typeClass":"primitive","value":"MassGIS (Office : Mass.)"}}]},{"typeName":"datasetContact","multiple":true,"typeClass":"compound","value":[{"datasetContactEmail":{"typeName":"datasetContactEmail","multiple":false,"typeClass":"primitive","value":"N/A"}}]},{"typeName":"dsDescription","multiple":true,"typeClass":"compound","value":[{"dsDescriptionValue":{"typeName":"dsDescriptionValue","multiple":false,"typeClass":"primitive","value":"1/2-meter resolution 1:5,000 orthophoto image of the Boston region from April 2001. This datalayer is a subset (covering only the Boston region) of the Massachusetts statewide orthophoto image series available from MassGIS. It consists of 23 orthophoto quads mosaicked together (MassGIS orthophoto quad ID: 229890, 229894, 229898, 229902, 233886, 233890, 233894, 233898, 233902, 233906, 233910, 237890, 237894, 237898, 237902, 237906, 237910, 241890, 241894, 241898, 241902, 245898, 245902). These medium resolution true color images are considered the new \"basemap\" for the Commonwealth by MassGIS and the Executive Office of Environmental Affairs (EOEA). MassGIS/EOEA and the Massachusetts Highway Department jointly funded the project. The photography for the mainland was captured in April 2001 when deciduous trees were mostly bare and the ground was generally free of snow. The geographic extent of this dataset is the same as that of the MassGIS dataset: Boston, Massachusetts Region LIDAR First Return Elevation Data, 2002 [see cross references]."}}]},{"typeName":"topicClassification","multiple":true,"typeClass":"compound","value":[{"topicClassValue":{"typeName":"topicClassValue","multiple":false,"typeClass":"primitive","value":"Maps"},"topicClassVocab":{"typeName":"topicClassVocab","multiple":false,"typeClass":"primitive","value":"LCSH"}},{"topicClassValue":{"typeName":"topicClassValue","multiple":false,"typeClass":"primitive","value":"Orthophotography"},"topicClassVocab":{"typeName":"topicClassVocab","multiple":false,"typeClass":"primitive","value":"LCSH"}},{"topicClassValue":{"typeName":"topicClassValue","multiple":false,"typeClass":"primitive","value":"imageryBaseMapsEarthCover"},"topicClassVocab":{"typeName":"topicClassVocab","multiple":false,"typeClass":"primitive","value":"ISO 19115 Topic Category"}},{"topicClassValue":{"typeName":"topicClassValue","multiple":false,"typeClass":"primitive","value":"image"},"topicClassVocab":{"typeName":"topicClassVocab","multiple":false,"typeClass":"primitive","value":"None"}},{"topicClassValue":{"typeName":"topicClassValue","multiple":false,"typeClass":"primitive","value":"ortho"},"topicClassVocab":{"typeName":"topicClassVocab","multiple":false,"typeClass":"primitive","value":"None"}},{"topicClassValue":{"typeName":"topicClassValue","multiple":false,"typeClass":"primitive","value":"raster"},"topicClassVocab":{"typeName":"topicClassVocab","multiple":false,"typeClass":"primitive","value":"None"}},{"topicClassValue":{"typeName":"topicClassValue","multiple":false,"typeClass":"primitive","value":"orthophoto"},"topicClassVocab":{"typeName":"topicClassVocab","multiple":false,"typeClass":"primitive","value":"None"}},{"topicClassValue":{"typeName":"topicClassValue","multiple":false,"typeClass":"primitive","value":"color"},"topicClassVocab":{"typeName":"topicClassVocab","multiple":false,"typeClass":"primitive","value":"None"}},{"topicClassValue":{"typeName":"topicClassValue","multiple":false,"typeClass":"primitive","value":"Massachusetts"},"topicClassVocab":{"typeName":"topicClassVocab","multiple":false,"typeClass":"primitive","value":"None"}},{"topicClassValue":{"typeName":"topicClassValue","multiple":false,"typeClass":"primitive","value":"aerial photography"},"topicClassVocab":{"typeName":"topicClassVocab","multiple":false,"typeClass":"primitive","value":"None"}}]},{"typeName":"producer","multiple":true,"typeClass":"compound","value":[{"producerName":{"typeName":"producerName","multiple":false,"typeClass":"primitive","value":"EOEA - MassGIS"}},{"producerName":{"typeName":"producerName","multiple":false,"typeClass":"primitive","value":"MassGIS (Office : Mass.)"}}]},{"typeName":"productionDate","multiple":false,"typeClass":"primitive","value":"N/A"},{"typeName":"productionPlace","multiple":true,"typeClass":"primitive","value":["Boston, Mass."]},{"typeName":"distributor","multiple":true,"typeClass":"compound","value":[{"distributorName":{"typeName":"distributorName","multiple":false,"typeClass":"primitive","value":"Harvard Geospatial Library"}}]},{"typeName":"timePeriodCovered","multiple":true,"typeClass":"compound","value":[{"timePeriodCoveredStart":{"typeName":"timePeriodCoveredStart","multiple":false,"typeClass":"primitive","value":"N/A"}}]},{"typeName":"kindOfData","multiple":true,"typeClass":"primitive","value":["map"]}]},"geospatial":{"displayName":"Geospatial Metadata","name":"geospatial","fields":[{"typeName":"geographicCoverage","multiple":true,"typeClass":"compound","value":[{"otherGeographicCoverage":{"typeName":"otherGeographicCoverage","multiple":false,"typeClass":"primitive","value":"Massachusetts"}}]},{"typeName":"geographicBoundingBox","multiple":true,"typeClass":"compound","value":[{"westLongitude":{"typeName":"westLongitude","multiple":false,"typeClass":"primitive","value":"-71.197177"},"eastLongitude":{"typeName":"eastLongitude","multiple":false,"typeClass":"primitive","value":"-70.952747"},"northLatitude":{"typeName":"northLatitude","multiple":false,"typeClass":"primitive","value":"42.476133"},"southLatitude":{"typeName":"southLatitude","multiple":false,"typeClass":"primitive","value":"42.223162"}}]}]},"socialscience":{"displayName":"Social Science and Humanities Metadata","name":"socialscience","fields":[{"typeName":"samplingProcedure","multiple":false,"typeClass":"primitive","value":"Keystone Aerial Surveys Inc. (KAS) of Philadelphia, PA acquired the aerial photography for the entire project using Kodak AeroColor 2444 and AeroColor 2445 film. KAS used large format Leica RC-30 calibrated aerial mapping cameras employing forward motion compensation and gyro-stabilized mounts. Each camera was also equipped with a tie to the aircraft GPS receiver. The flying altitude was approximately 15,000 feet to provide an original photo scale of 1 = 2,500. Endlap (forward overlap) was 60%, except 80% in areas with tall structures, with (high) sidelap of 42%. The processing of the photos was conducted by two firms. Intermap Technologies of Englew\nood, Colorado and Ottawa and Calgary, Canada processed the mainland portion of the Commonwealth east of the 165000-meter line (in MA State Plane coordinates) and Chas. H. Sells, Inc. of Charlton, MA processed the remaining area west of this line (approximately 72 degrees longitude), as well as the Islands. These vendors provided scanning, softcopy aerial triangulation, orthorectification, image mosaicking and quality control. Ground and photogrammetric control (elevation model) for the orthorectification of the aerial photography was available statewide from the previous black-and-white 1:30,000 digital orthophotography program conducted from 1992-2000 (see the Black and White Orthophoto datalayer description). The transfer of control from that project made the creation of these new data much more efficient, and assured a very high level of accuracy and compatibility. The color negatives were scanned at 14 (12.5 Sells) microns and then inverted. The pixels were subsequently resampled to 0.5 meters ground resolution. Each pixel is coded with three 8-bit values representing the amounts of Red, Green, and Blue in the pixel. This produces a 24-bit RGB image. 8-bit (values ranging 0-255) Red, Green, and Blue values are packed into a single 24-bit identity. This allows for a maximum of 16,777,216 unique combinations of colors. The imagery was radiometrically balanced prior to mosaicking. Only minor adjustments were made to the brightness and contrast. In the Intermap data, to avoid color distortion of land areas, color balancing was preceded by the removal of data in large bodies of water and the ocean. The water pixels were then merged back in. Since the Sells data did not contain large bodies of water (except for the Quabbin Reservoir), it was not processed in this manner. The original 0.5 meter data was delivered to MassGIS in GeoTIFF format in orthoquad tiles representing 4 x 4 km on the ground (8000 rows x 8000 columns, equaling 64,000,000 pixels). Since each pixel contains 24 bits (3 bytes) of data, a full resolution image covering one orthoquad tile is approximately 192,000,000 bytes (183 Megabytes) in size. The tiles are based on the Orthophoto Index Grid and are named\n<sheet-id>.tif, where the <sheet-id> is the first 3 digits of the state plane XY coordinate pair for the lower right corner of each cell. Header files (named <sheet-id>.tfw) were also delivered for use in some GIS software. Imagery is georeferenced to Massachusetts State Plane (Lambert Conformal Conic Projection) NAD83 denominated in meters."}]}},"files":[{"description":"","label":"SDE Raster","restricted":false,"version":1,"datasetVersionId":19473,"dataFile":{"id":2333428,"persistentId":"","filename":"SDE Raster","contentType":"application/octet-stream","friendlyType":"Unknown","filesize":0,"description":"","storageIdentifier":"http://hgl.harvard.edu:8080/HGL/jsp/HGL.jsp?action=VColl&VCollName=MASSGIS_HALF_MTR_ORTHO","rootDataFileId":-1,"md5":"","checksum":{"type":"MD5","value":""},"tabularData":false,"creationDate":"2015-04-08","publicationDate":"2011-12-12","lastUpdateTime":"2011-12-13T18:19:55Z","fileAccessRequest":false}}]}}}