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<p>This high resolution imagery of Massachusetts during leaf-off conditions in the Spring of 2015 was acquired by DigitalGlobe™ of Longmont, Colorado.</p>

<p>MassGIS had the WorldView-2 and WorldView-3 satellites tasked to collect swaths of panchromatic and multispectral imagery in 43 separate overflights from March 16 - May 7, 2015. WorldView-2 operates at an altitude of 770 km (478 mi.), and WorldView-3 at 617 km (383 mi.).</p>

<p>The pixel resolutions of the delivered data varied due to off-nadir viewing angles and the altitudes of the sensors:</p>

<p style='margin-left:40px;'>0.46 - 0.73 m panchromatic and 1.87 - 2.94 m multispectral (WorldView-2)<br />
0.40 - 0.46 m panchromatic and 1.60 - 1.83 m multispectral (WorldView-3)</p>

<p>Pixels closest to nadir (the point directly below the sensor) have a better resolution than those farthest from nadir. U.S. regulation requires imagery to be resampled to a minimum of .40 m pan and 1.6m multispectral.</p><p>This Web service was created in ArcMap 10.3 and published to a tile package and is hosted at MassGIS' organizational ArcGIS Online account. In ArcMap the display settings (stretching, brightness and contrast) were modified for each mosaic dataset in order to achieve the best possible uniform appearance across the state; however, because of the different acquisition dates and satellites seams are visible at smaller scales.</p><p>See <a href='https://www.mass.gov/info-details/massgis-data-2015-satellite-imagery' rel='nofollow ugc' target='_blank'>metadata</a> for full details.</p>
[]
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