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Typical means of referring to the marker.RMNumber - FEMA elevation reference mark identifier.DateEstablished - Date of last reference mark leveling and setting of horizontal and vertical control.EstablishedBy - Surveyor or survey company producing last releveling on date defined by 'DateEstablished'.Status - Current reference mark status.NGSClassification - Classification based on the new NGS classification system. Range VI indicates that the position meets the 0.02m - 0.05m accuracy standard for horizontal position, ellipsoidal height, and orthometric height (elevation) at the 95% confidence level.LocationStream - Name of most adjacent stream to reference mark.Watershed - Name of watershed containing the reference mark.County - Name of the county containing the reference mark.State - Abbreviation for the state containing the reference mark. Default value is TX (Texas).Physical Description of MarkMarkerType - Type of physical marker on the ground.MarkerStamping - Identification number stamped on top of the physical marker.MarkerLogo - Description of logo or design on top of the physical marker.General SurveyRMsDirectlyTied - FEMA RM numbers of other nearby markers directly used in the location survey.RMsTiedUnit - Units used when directly tying to the markers designated in 'RMsDirectlyTied'.Horizontal SurveyHorizontalSurveyMethod - Method used to prepare horizontal marker location.HorizontalDatum - Datum used to prepare horizontal marker location.HorizontalAdjustment - Datum adjustment applied to the 'HorizontalDatum' when preparing horizontal marker location.Projection - Projection zone used when surveying marker location.Vertical SurveyVerticalSurveyMethod - Method used to prepare vertical marker location.VerticalDatum - Datum used to prepare vertical marker location.VerticalAdjustment - Datum adjustment applied to the 'VerticalDatum' when preparing vertical marker location.GeoidModel - Geoid model used when surveying marker location.Horizontal PositionLatitude - Latitude of the marker in degrees, minutes, seconds.Longitude - Longitude of the marker in degrees, minutes, seconds.LatitudeDecimal - Latitude of the marker in decimal degrees.LongitudeDecimal - Longitude of the marker in decimal degrees.Easting - X location of the marker in projection and units defined by the 'Projection' field.Northing - Y location of the marker in projection and units defined by the 'Projection' field.Vertical PositionElevation - Elevation of the marker in the datum and adjustment defined by 'VerticalDatum' and 'VerticalAdjustment' fields.ElevationNotes - Additional notes associated with elevation and vertical position determination.EllipsoidHeight - Also known as Geodetic Height. Distance above or below the ellipsoid used to determine vertical position.GeoidHeight - Separation between the geoid and the ellipsoid used to determine vertical position.Grid/Projection DistortionConvergence - Delta in angular direction of grid north vs true north used in marker survey.ScaleFactor - Measure of distortion between ellipsoidal and projected distances used in marker survey.ElevationFactor - Also known as Orthometric Height Scale. Factor used to calculated geodetic distance above or below the ellipsoid for the marker survey.Combined Factor - Factor used to calculate ellipsoid distance from grid distance above or below the ellipsoid for the marker survey.LocationGeneral Location - Brief, regional scale description of marker location.Directions - Specific directions to the marker from a nearby point of interest.SourceDataSource - This data set is a compilation of many independent reference marker data sources. 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