OVERVIEW

These data layers are used to index the half-meter MrSID mosaics for the 2001/2003 and 2005 1:5,000 Color Ortho Imagery as well as the CD and DVD schemes used for their distribution. They are stored in ArcSDE as follows:

• COQHMOSAICS_POLY - 2001 MrSID Mosaics Index
• COQHMOSAICSCDS_POLY - 2001 MrSID Mosaics CD-ROM Index
• COQHMOSAICSDVDS_POLY - 2001 MrSID Mosaics DVD Index
• COQMOSAICS2005_POLY - 2005 MrSID Mosaics Index
• COQMOSAICSCDS2005_POLY - 2005 MrSID Mosaics CD-ROM Index
• COQMOSAICSDVDS2005_POLY - 2005 MrSID Mosaics DVD Index

The index polygons were generated by using the DISSOLVE function in ArcGIS to aggregate 4km x 4km grid cells from a copy of the Digital Orthophoto Index layer (OQMAIN_POLY). Each cell was coded according to which mosaic contained the original 1/2-meter GeoTIFF images, which were tiled by Ortho Index.

The polygon attribute tables contains the following items:

MOSAIC		Name of MrSID Mosaic
NUMTILES		Number of 4km x 4km GeoTIFF images in the mosaic
CD_NAME		Name of CD in statewide set on which the mosaic appears
DVD_NAME		Name of DVD in statewide set on which the mosaic appears

These datalayers are maintained by MassGIS and is used in the 2001/2003 and 2005 Mosaic CD and DVD Schemes, which may be referred to when ordering the mosaics.

The DVD schemes were modified in February 2007 so that both the 2001/2003 and 2005 DVD indexes have 3 tiles, for the WEST, CENTRAL, and EAST DVDs. The Mosaics layers had their DVD_NAME attribute values edited to match the new DVD tile names.

Last Updated 2/5/2007
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