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MassGIS Data: USGS Color Ortho Indexes (2013/2014)

March 2015
These layers are the tiling scheme for the 2013/2014 USGS orthophotos.
Download these layers
Shapefiles (zipped)
2013-2014 USGS Color Ortho Index Map

 These data layers are used to index the USGS 2013/2014 Color Ortho Imagery tiles and MrSID mosaics distributed by MassGIS.

The layer named COQ2013INDEX_POLY is an index for the original GeoTiff images and the MassGIS-produced JPEG 2000 versions. It stores the Web links for the JPEG 2000 free downloads. Each tile measures 1,500m x 1,500m. Click on the top image at right to view a larger index map and also see the PDF version of the Index Map pdf
format of 2013/2014 USGS Color Ortho Imagery Index
file size 7MB.

The layer named COQ2013MOSAICS30CM_POLY is used to index the MrSID mosaic images created from the original GeoTiffs at 30:1 compression ratio. Click on the image at the lower right to view a larger index map and also see the PDF Index Map pdf
format of 2013/2014 USGS Color Ortho MrSID Mosaics Index
Map
for details.

Production

The GeoTiff/JPEG 2000 index polygons were delivered to MassGIS with the imagery from USGS, one for each of the delivery areas (Boston, Worcester and Springfield for 2013, and UTM18 and UTM19 for 2014). The Boston, Worcester and UTM19 polygons were referenced to the UTM Zone 19N coordinate system. The Springfield and UTM18 polygons were referenced to the UTM Zone 18N coordinate system. MassGIS projected each layer to the NAD1983 Mass. State Plane Mainland Meters coordinate system and merged them into this one feature class and added some attribute fields. Note that MassGIS did not project the imagery: all imagery was kept in the original UTM projections as delivered by the USGS.2013/2014 USGS Color Ortho MrSID Mosaics Index Map

To create the MrSID mosaic index, MassGIS added the MOSAIC field to the original tile index and dissolved the layer on that field using ArcGIS 10.2. The MrSID mosaic index is referenced to the NAD1983 Mass. State Plane Mainland Meters coordinate system.

Attributes

The COQ2013INDEX_POLY polygon attribute table contains the following fields:

Attribute Description
TILENAME     Unique 11-character ID for each 1,500m x 1,500m tile. Image names that begin with "18" are referenced to the UTM NAD 1983 Zone 18N coordinate system. Image names that begin with "19" are referenced to the UTM NAD 1983 Zone 19N coordinate system.
DEL_AREA   Name of USGS project delivery area. For 2013 imagery the codes are BOS=Boston, SPR=Springfield and WORC=Worcester. For 2014 imagery the codes are UTM18 and UTM19.
URL Web link for downloading JPEG 2000 tiles
MOSAIC Name (number) of the MrSID mosaic of which the tile's image is a part.
IMG_YEAR The year in which the imagery was captured (2013 or 2014).

The COQ2013MOSAICS30CM_POLY polygon attribute table contains the following fields:

Attribute Description
MOSAIC Name (number) of the MrSID mosaic
URLS Web link for downloading MrSID mosaic
YEAR The year in which the imagery was captured (2013 or 2014). Some mosaics contain tiles from both years and are coded 2013-2014 in this field.
COORD_SYS   The coordinate system to which the imagery is referenced: UTM18 (UTM NAD 1983 Zone 18N) and UTM19 (UTM NAD 1983 Zone 19N).

Maintenance

These datalayers are maintained by MassGIS. Tiles covering Cape Cod were added in March 2015, at which time the 2013-2014 imagery was available statewide.

Last Updated 3/24/2015

Items

Contributor
Modified Date
2017-12-07
Release Date
2017-12-06
Identifier
775ed266-76ea-48ff-acd8-43f915f79301
Spatial / Geographical Coverage Location
Massachusetts
License
Author
MassGIS
Contact Name
MassGIS
Contact Email
Public Access Level
Public
Data Quality
False
Content Type
Language
English (United States)