Name: Benchmarks

Display Field: MarkerName

Type: Feature Layer

Geometry Type: esriGeometryPoint

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.

Service Item Id: 6c6ba4a2a3394c11a65a45d25c762847

Copyright Text:

Default Visibility: false

MaxRecordCount: 1000

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 0

Max Scale: 0

Supports Advanced Queries: true

Supports Statistics: true

Has Labels: true

Can Modify Layer: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: -1.0741403111391656E7
YMin: 3421693.333942402
XMax: -1.0557009496178731E7
YMax: 3585812.3556706184
Spatial Reference: 102100  (3857)

Drawing Info:

Renderer:
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Field 3: N/A
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Default Symbol:
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Default Label: N/A
UniqueValueInfos:
• Value: City of Conroe
  Label: Benchmark - City of Conroe
  Description: N/A
  Symbol:
  
• Value: City of League City
  Label: Benchmark - City of League City
  Description: N/A
  Symbol:
  
• Value: City of Sugar Land
  Label: Benchmark - City of Sugar Land
  Description: N/A
  Symbol:
  
• Value: Fort Bend County
  Label: Benchmark - Fort Bend County
  Description: N/A
  Symbol:
  
• Value: HCFCD
  Label: Benchmark - HCFCD
  Description: N/A
  Symbol:
  
• Value: Montgomery County LiDAR
  Label: Benchmark - Montgomery County LIDAR
  Description: N/A
  Symbol:
  
Transparency: 0
Labeling Info:
Label Placement: esriServerPointLabelPlacementAboveRight
Label Expression: "BM " CONCAT [MarkerName]
Use Coded Values: true
Symbol:
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Label Expression: "BM " CONCAT [MarkerName]
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Advanced Query Capabilities:

Supports Statistics: true
Supports OrderBy: true
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Supports Pagination: true
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Supports Returning Query Extent: true
Supports Query With Distance: true
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Supports Query With LOD Spatial Reference: false
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Supports Having Clause: true
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Supports Time Relation: true
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Supports Query Analytic: false
Supports Query With Current User: true

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• MarkerName ( type: esriFieldTypeString, alias: Marker Name, length: 100 )
• RMNumber ( type: esriFieldTypeString, alias: FEMA RM Number, length: 50 )
• DateEstablished ( type: esriFieldTypeDate, alias: Date Established, length: 8 )
• EstablishedBy ( type: esriFieldTypeString, alias: Established By, length: 200 )
• Status ( type: esriFieldTypeString, alias: Status, length: 50 )
• NGSClassification ( type: esriFieldTypeString, alias: NGS Classification, length: 50 )
• Stream ( type: esriFieldTypeString, alias: Stream Name, length: 100 )
• Watershed ( type: esriFieldTypeString, alias: Watershed, length: 100 )
• County ( type: esriFieldTypeString, alias: County, length: 50 )
• State ( type: esriFieldTypeString, alias: State, length: 2 )
• MarkerType ( type: esriFieldTypeString, alias: Marker Type, length: 50 )
• MarkerStamping ( type: esriFieldTypeString, alias: Stamping on Marker, length: 50 )
• MarkerLogo ( type: esriFieldTypeString, alias: Logo on Marker, length: 100 )
• RMsDirectlyTied ( type: esriFieldTypeString, alias: RMs Directly Tied, length: 100 )
• RMsTiedUnit ( type: esriFieldTypeString, alias: Unit of Measure for Tied RMs, length: 50 )
• HorizontalSurveyMethod ( type: esriFieldTypeString, alias: Horizontal Survey Method, length: 50 )
• HorizontalDatum ( type: esriFieldTypeString, alias: Horizontal Datum, length: 50 )
• HorizontalAdjustment ( type: esriFieldTypeString, alias: Horizontal Adjustment, length: 50 )
• Projection ( type: esriFieldTypeString, alias: Projection Zone, length: 50 )
• VerticalSurveyMethod ( type: esriFieldTypeString, alias: Vertical Survey Method, length: 50 )
• VerticalDatum ( type: esriFieldTypeString, alias: Vertical Datum, length: 50 )
• VerticalAdjustment ( type: esriFieldTypeString, alias: Vertical Adjustment, length: 50 )
• GeoidModel ( type: esriFieldTypeString, alias: Geoid Model Used, length: 50 )
• Latitude ( type: esriFieldTypeString, alias: Latitude, length: 50 )
• Longitude ( type: esriFieldTypeString, alias: Longitude, length: 50 )
• LatitudeDecimal ( type: esriFieldTypeDouble, alias: Latitude (Decimal Degrees) )
• LongitudeDecimal ( type: esriFieldTypeDouble, alias: Longitude (Decimal Degrees) )
• Easting ( type: esriFieldTypeDouble, alias: Easting )
• Northing ( type: esriFieldTypeDouble, alias: Northing )
• Elevation ( type: esriFieldTypeDouble, alias: Elevation )
• ElevationNotes ( type: esriFieldTypeString, alias: Elevation Notes, length: 500 )
• EllipsoidHeight ( type: esriFieldTypeDouble, alias: Ellipsoid Height )
• GeoidHeight ( type: esriFieldTypeDouble, alias: Geoid Height )
• Convergence ( type: esriFieldTypeDouble, alias: Convergence )
• ScaleFactor ( type: esriFieldTypeDouble, alias: Scale Factor )
• ElevationFactor ( type: esriFieldTypeDouble, alias: Elevation Factor )
• CombinedFactor ( type: esriFieldTypeDouble, alias: Combined Factor )
• GeneralLocation ( type: esriFieldTypeString, alias: General Location, length: 255 )
• Directions ( type: esriFieldTypeString, alias: Directions, length: 500 )
• DataSource ( type: esriFieldTypeString, alias: Original Source, length: 50 )
• SHAPE ( type: esriFieldTypeGeometry, alias: SHAPE )
• ExternalUrlCombined ( type: esriFieldTypeString, alias: Source Datasheet, length: 255 )
• SketchURL ( type: esriFieldTypeString, alias: Photo Sketch URL, length: 150 )
• Photo1URL ( type: esriFieldTypeString, alias: Photo 1 URL, length: 150 )
• Photo2URL ( type: esriFieldTypeString, alias: Photo 2 URL, length: 150 )

Supported Operations:   Query   Query Attachments   Query Analytic   Generate Renderer   Return Updates

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