Vertical Point Spacing The vertical distance between laser points from consecutive ― scan lines when the lidar sensor is tilted into a forward-looking position and laser points up” the face of vertical objects. “walk Viewshed See Intervisibility — Void Portions of a digital elevation dataset where no elevation data are available. In — USGS DEMs, each elevation post located within a void area is assigned a discrete false value representing the void. Treatment of void areas should be documented in the metadata file. Voxel A three-dimensional "cube" that serves as a counterpart to a traditional pixel, — used for three-dimensional visualization of elevation data. A 3-D pixel. W Water A synonym for tide, in the sense of the elevation of the surface of the — hydrosphere at a particular longitude and latitude. High Water The greatest elevation reached by a rising tide — Higher High The higher of the two high waters occurring on a particular — tidal day Higher Low Water The higher of the two low waters occurring on a particular — tidal day. Low The least elevation reached by a falling tide. — Lower Low Water The lower of two low waters of any tidal day. — Lower High Water The lower of two high waters of any tidal day. — Mean High Water (MHW) The average elevation of all high waters recorded at a — particular point or station over a considerable period of time, usually 19 years. Mean Higher High Water (MHHW) The arithmetic average of the elevations of — the higher high waters of a mixed tide over a specific 19-year period Mean Low (MLW) The average elevation of all low waters recorded at a — particular point or station over a considerable period of time, usually 19 years. Mean Lower Low Water (MLLW) The average elevation of all the lower low — waters recorded over a 19-year period. The elevation determined by averaging the elevations of the Mean Water Level — surface of water at equal intervals of time (usually hourly) over a considerable period of time. Waveform Lidar See Full Waveform Lidar. — Weight A factor by which a quantity is multiplied to increase or decrease the effect of — that quantity on the results of an adjustment.
Vertical Point Spacing ― The vertical distance between laser points from consecutive scan lines when the lidar sensor is tilted into a forward-looking position and laser points “walk up” the face of vertical objects. Viewshed — See Intervisibility Void — Portions of a digital elevation dataset where no elevation data are available. In USGS DEMs, each elevation post located within a void area is assigned a discrete false value representing the void. Treatment of void areas should be documented in the metadata file. Voxel — A three-dimensional "cube" that serves as a counterpart to a traditional pixel, used for three-dimensional visualization of elevation data. A 3-D pixel. W Water — A synonym for tide, in the sense of the elevation of the surface of the hydrosphere at a particular longitude and latitude. High Water — The greatest elevation reached by a rising tide Higher High — The higher of the two high waters occurring on a particular tidal day Higher Low Water — The higher of the two low waters occurring on a particular tidal day. Low — The least elevation reached by a falling tide. Lower Low Water — The lower of two low waters of any tidal day. Lower High Water — The lower of two high waters of any tidal day. Mean High Water (MHW) — The average elevation of all high waters recorded at a particular point or station over a considerable period of time, usually 19 years. Mean Higher High Water (MHHW) — The arithmetic average of the elevations of the higher high waters of a mixed tide over a specific 19-year period Mean Low (MLW) — The average elevation of all low waters recorded at a particular point or station over a considerable period of time, usually 19 years. Mean Lower Low Water (MLLW) — The average elevation of all the lower low waters recorded over a 19-year period. Mean Water Level — The elevation determined by averaging the elevations of the surface of water at equal intervals of time (usually hourly) over a considerable period of time. Waveform Lidar — See Full Waveform Lidar. Weight — A factor by which a quantity is multiplied to increase or decrease the effect of that quantity on the results of an adjustment.
Appendix_B_Glossary.docx