Description: Survey reference marks are maintained by many organizations from cities to regional entities (like counties and districts) to federal agencies. This dataset combined the various sources of this data around the Houston area to provide a single, cohesive reference mark data set.Data SourcesCity of ConroeCity of League CityCity of Sugar LandFort Bend CountyHarris County Flood Control District (HCFCD)Montgomery County LiDARFieldsGeneral IdentificationMarkerName - Common name given to the marker. 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. Designates the original source of the specific marker.
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Description: Wells from the Railroad Commission of Texas. Point locations of wells containing attributes such as, LAT, LONG, type and quality of location.Date of Data: February 2014Date of Update: February 2014
Description: Pipelines from the Railroad Commission of Texas. Pipelines contain information such as, commodity, operator, system, and quality of location.It is important to note the pipelines in this database are collected from a wide variety of data sources, which results in the data quality varying as well. Data accuracy ranges from within 50 feet to 500-1000 feet.The Texas Railroad Commission is currently in the process of modifying and updating pipeline attributes to conform to the National Pipeline Mapping System (NPMS). Users of RRC pipeline data can expect specific items within the pipeline attribute table to be updated at any time.The Texas Railroad Commission is currently in the process of modifying and updating pipeline attributes to conform to the National Pipeline Mapping System (NPMS). Users of RRC pipeline data can expect specific items within the pipeline attribute table to be updated at any time.STATUS_CD - Status CodeI - In ServiceB - AbandonedR - RetiredQUALITY_CD - Quality Code - Operator's estimate of the positional accuracy of the submitted pipeline segment.E - Excellent 50 feetV - Very Good 50 -300 feetG - Good 301-500 feetP - Poor 501-1,000 feetU - UnknownDate of Data: February 2014Date of Update: February 2014
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Min. Scale: 40000.0 Max. Scale: 0.0 Label Placement: esriServerPolygonPlacementAlwaysHorizontal Label Expression: [L1SURNAM] Use Coded Values: true Symbol:
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