Description: Outer Continental Shelf Lease Blocks are used to assist in leasing on the Outer Continental Shelf. Blocks are numbered areas depicted on the OPDs or Leasing Maps. Most are of a uniform size according to the projection and type of map on which they are depicted, but many are of non-uniform size and shape due to their proximity to an adjacent map, projection zone, or boundary. Blocks should always be referred to with their parent protraction name or number since block numbers repeat from one protraction to the next.
These "improved" blocks contain information regarding features within each block. All GCAMP layers were overlaid with OCS blocks to determine presence/absence/count and the min, max and mean values of of features intersecting OCS blocks. Intersect operations were used to determine presence or absence for vector features and zonal statistics used to calculate raster values per OCS block.
http://metadata.boem.gov/geospatial/OCS_LeaseBlocks_Atlantic_NAD83.xml