Digital Offshore Cadastre (DOC) - Atlantic83 - Official Protraction Diagram (OPD) Outlines - CZM_moris_prot_clp_poly

This data set contains Official Protraction Diagram (OPD) outlines in ESRI Arc/Info export and Arc/View shape file formats for the MMS Atlantic Region. The use of OPD's makes it easier to refer to individual blocks within a region or planning area. Further information on the historic development of OPD's can be found in OCS Report MMS 99- 0006:Boundary Development on the Outer Continental Shelf. Because GIS projection and topology functions can change or generalize coordinates, these GIS files are NOT an OFFICIAL record for the exact OPD boundaries. Only the paper OPD or a digital image of them serve as OFFICIAL records.

本数据集包含适用于矿产管理服务局（Minerals Management Service, MMS）大西洋区域的官方分区示意图（Official Protraction Diagram, OPD）轮廓数据，格式为ESRI Arc/Info导出格式与Arc/View形状文件（shapefile）格式。借助OPD可更便捷地指代区域或规划区内的各个独立区块。关于OPD的历史发展详情，可查阅外大陆架（Outer Continental Shelf, OCS）报告MMS 99-0006：《外大陆架边界开发》。由于GIS投影与拓扑功能可能会修改或概化坐标信息，因此此类GIS文件并非OPD精确边界的官方备案文件。仅纸质OPD或其数字影像可作为官方备案的有效依据。