2021 Cambridge Orthophoto
GIS File Name
Cambridge2021
Description
Product: This orthoimagery data set includes 0.25 foot digital orthoimages in 8-bit 4-band (RGB-IR) GeoTIFF tiles and 8-bit 4-band (RGB-IR) MrSID mosaics (20:1 compression ratio). Geographic Extent: 3 counties in Massachusetts, covering approximately 13 total square miles. Dataset Description: The Cambridge, MA Orthoimagery project called for the planning, acquisition, processing, and derivative products of imagery data to be collected at a ground sample distance (GSD) of 0.25 foot. Project specifications are based on the American Society of Photogrammetry and Remote Sensing (ASPRS) standards. The data were developed based on a horizontal projection/datum of NAD 1983 2011 StatePlane Massachusetts Mnld FIPS 2001 FtUS, Foot US. Imagery data were delivered as 0.25 foot 8-bit 4-band (RGB-IR) GeoTIFF tiles and 8-bit 4-band (RGB-IR) MrSID mosaics (20:1 compression ratio). Tiled deliverables contained 53 individual 2640 ft x 2640 ft tiles. Ground Conditions: Imagery was collected in spring 2021, while no snow was on the ground and rivers were at or below normal levels.
Purpose
The orthophoto was flown for the City of Cambridge. Aerial photos were taken in 2021 by Quantum Spatial. The dataset was created at a higher resoltion than a concurrent image capture for the MassGIS.
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Coordinate System
NAD 1983 2011 StatePlane Massachusetts Mnld FIPS 2001 FtUS