This polygon shapefile represents Rextag GIS Zones in the United States. The Rextag maps are primarily used to record energy data, and this map shows how the company breaks down the United States into three distinct zones for data and mapping purposes. This layer is from Winter Quarter 2016. This layer is intended to assist users in locating and analyzing Rextag GIS Zone data in the United States and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. Hart Energy Publishing.(2016). Rextag GIS Zones, United States, Winter 2016. Hart Energy Publishing. Available at: http://purl.stanford.edu/zg702ry9391 This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.