Maine Elevation Contours 2 Feet 19TDM. These elevation vector data are derived from LiDAR point cloud data and represent contours generated at a two foot (2') interval covering the majority of the State of Maine. Data are organized in United States National Grid (USNG) 100,000 meter x 100,000 meter grid size in EPSG 6348 Coordinate Reference System (CRS). This organization scheme was chosen to match the grid scheme of the LiDAR data collections that supported creation of this derivative data. Additionally, this scheme provides data sets that are suitable for GIS services, allow rendering in GIS client applications and permits manageable download size. For further information on the construct of these data, refer to the Lineage section of this metadata.