Vertical control web app for St. Lucie County Florida. This app is uploaded to the SLC GIS HUB Site

Establish elevations for a network of monuments called benchmarks. A benchmark is a relatively permanent material object, natural or artificial, bearing a marked point whose elevation above or below an adopted datum is known. Vertical datums for referencing benchmark elevations are based on mean sea level. The basic vertical control for topographic mapping of the benchmarks or other points of known elevation established throughout a project, also termed basic control or level control. This data is all within the limits of the York Region Boundary and most were established approximately 20 years ago. Most are still considered accurate but it is suggested that they should be checked against other benchmarks to make sure.

Points of Vertical Geodetic Control include points of Fundamental Vertical Geodetic Control and Minor Vertical Geodetic Control. Administrator is Land Survey Office, resp. Cadastral offices according to relevant category of the geodetic control.

This data contains a set of geodetic control stations maintained by the National Geodetic Survey. Each geodetic control station in this dataset has either a precise Latitude/Longitude used for horizontal control or a precise Orthometric Height used for vertical control, or both. The National Geodetic Survey (NGS) serves as the Nation's depository for geodetic data. The NGS distributes geodetic data worldwide to a variety of users. These geodetic data include the final results of geodetic surveys, software programs to format, compute, verify, and adjust original survey observations or to convert values from one geodetic datum to another, and publications that describe how to obtain and use Geodetic Data products and services.

This data contains a set of geodetic control stations maintained by the National Geodetic Survey. Each geodetic control station in this dataset has either a precise Latitude/Longitude used for horizontal control or a precise Orthometric Height used for vertical control, or both.The National Geodetic Survey (NGS) serves as the Nation's depository for geodetic data. The NGS distributes geodetic data worldwide to a variety of users. These geodetic data include the final results of geodetic surveys, software programs to format, compute, verify, and adjust original survey observations or to convert values from one geodetic datum to another, and publications that describe how to obtain and use Geodetic Data products and services.

This is a point data set representing monumented vertical geodetic survey control points (a.k.a. elevation benchmarks) established by the City of Boise. A benchmark is a physical marker, monument, or demarcation established by a surveyor for horizontal and/or vertical measurement control. This data set only contains benchmarks established by the City of Boise that are based on the North American Vertical Datum of 1988 (NAVD 88); benchmarks established under other vertical datums are not included. The elevation values in this data set are based on the vertical control from the National Geodetic Survey (NGS), the U. S. Geological Survey (USGS), and some state owned vertical control. The horizontal location is obtained by Global Positioning System (GPS) data collection of the surveyed benchmark. Attribute data including elevation, is transcribed from surveying field books supplied by Boise City Public Works survey personnel. Data Attributes:MARK TYPE: ALCAP - Aluminum Cap, BRASSCAP - Brass Cap, CHISELSQ - physically carved square, PK - A steel masonry nail manufactured by Parker Kaelon (PK nail), OTHER - Any other survey marker type.LOCATION: Nearest street or cross streets to the benchmark.ELEVATION: The vertical elevation in feet above sea level as established from survey calculations based on the 1988 NAVD Datum.GPS DATE: Date the benchmark was captured by GPS.COMMENTS: Pertinent notes on general description and location of the benchmark.BOOK: The City of Boise Public Works surveying field book number the benchmark was established under.PAGE: The City of Boise Public Works surveying field book page the benchmark was established under.The data set is maintained by the Boise City Public Works GIS staff. The data is updated continuously. It is current to the date it was published.For more information, please visit Ada County Control Information or City of Boise Public Works.

This data contains a set of geodetic control stations monitored by the National Geodetic Survey. Each geodetic control station in this dataset has either a precise Latitude/Longitude used for horizontal control or a precise Orthometric Height used for vertical control, or both. The National Geodetic Survey (NGS) serves as the Nation's depository for geodetic data. The NGS distributes geodetic data worldwide to a variety of users. These geodetic data include the final results of geodetic surveys, software programs to format, compute, verify, and adjust original survey observations or to convert values from one geodetic datum to another, and publications that describe how to obtain and use Geodetic Data products and services.Data Download: https://ky.box.com/s/dmzcp4thfhj9iz4rsbfg180g4lsoarus

The Geodetic Database contains information on permanent geodetic control marks located in Minnesota or just outside its boundaries. Permanent geodetic control marks are established for the purpose of providing precise horizontal and vertical control positions for the registration of surveying and mapping activities in the local area. Information about the location of an object based on its geodetic location locates that object in a worldwide geographic information system. The marks have unique identification and year established stamped on the monument disk, usually an 89 mm (3.5 inch) diameter brass or aluminum disk. Monuments consist of material (concrete or metal) that is meant to stay in place for 50 to 100 years or more, and have little or no movement due to frost action or activity near the monument. The marks have been established by all levels of government in Minnesota, and they are referenced to the National Geodetic Reference System (NAD 1927, NAD 1983, NGVD 1929, and NAVD 1988). The Federal Government supports monumentation at the state level by providing technical expertise, adjustments of the data, and maintenance of the National Geodetic Reference System through its State Advisor Program.

Control points are captured by land surveyors to create control for orthophotography. These points are captured with survey-grade equipment ensuring the highest accuracy in their location. Horizontal Control Point: Surveyed horizontal geodetic control points that are used in the development of an analytical aerotriangulation solution. Vertical Control Point: Surveyed vertical geodetic control points that are used in the development of an analytical aerotriangulation solution.

This data contains a set of geodetic control stations maintained by the National Geodetic Survey in the state of Rhode Island. Each geodetic control station in this dataset has either a precise Latitude/Longitude used for horizontal control or a precise Orthometric Height used for vertical control, or both.

This dataset represents all geodetic control stations throughout the state of Rhode Island. The National Geodetic Survey (NGS) serves as the Nation's depository for geodetic data. The NGS distributes geodetic data worldwide to a variety of users. These geodetic data include the final results of geodetic surveys, software programs to format, compute, verify, and adjust original survey observations or to convert values from one geodetic datum to another, and publications that describe how to obtain and use Geodetic Data products and services.

This point feature class contains a set of geodetic control stations maintained by the South Florida Water Management District (SFWMD). Each geodetic control station in this dataset has either a precise Latitude/Longitude used for horizontal control or a precise Orthometric Height used for vertical control, or both. This feature class is updated and maintained by SFWMD's Survey Section.

Control points are captured by land surveyors to create control for orthophotography. These points are captured with survey-grade equipment ensuring the highest accuracy in their location.Horizontal Control Point: Surveyed horizontal geodetic control points that are used in the development of an analytical aerotriangulation solution.Vertical Control Point: Surveyed vertical geodetic control points that are used in the development of an analytical aerotriangulation solution.

Horizontal Control Network is a network of known horizontal geographic positions, referenced to geographic parallels and meridians or to other lines of orientation such as plane coordinate axes. Each Horizontal Control Monument (Station) is linked to an individual sketch.A vertical control survey determines elevation with respect to sea level. Each benchmark is linked to an individual description of the location.

Los Angeles County Department of Public Works’ Vertical Control Network is composed of more than 1,700 miles (2,720 kilometers) of level runs and comprise nearly 9,000 benchmarks. The basic accuracy of the net is reflected by an indicated field probable error of ± 0.017 feet per mile (4 mm per kilometer) of leveling as determined from conditions of closure. However, because of varying degrees of subsidence and heaving, the true datum is recovered only by obtaining substantial agreement of a number of benchmarks.For each active benchmark, a point representation was created in GIS by locating them based on their description. Parcel data, mile markers, the County Address Management System (CAMS), LARIAC aerials, oblique photos, 2-foot contour lines and/or Google Street View were used in assisting with the location.The creation of the benchmarks in GIS greatly enhances the Vertical Control Network by adding visual context with respect to their representative geospatial locations. With a glance, geospatial patterns can be observed and out-of-place benchmarks can be quickly identified and remapped to the correct location after verification.To facilitate the adjustment, indexing and distribution of adjusted values in the network, the county territory was divided into 33 quads or areas. For identification purposes, each quad was given a name (for example, “Rosemead”, “La Mirada”, “Santa Fe”, and etc.). Index maps, county maps, and other information can be accessed and downloaded on the basis of each of the quads by going to Survey Division’s Benchmark Retrieval System (https://pw.lacounty.gov/sur/benchmark). General adjustments are carried out every 5 to 10 years and the provided elevation data is expected to remain sound during this period. When a quad is adjusted, new elevations will be published and the date of the readjustment will be noted. No historical data is provided, but it can be acquired from Survey Division’s Public Records Counter or via the fee based Optional Technical Research (OTR) program. For general questions, contact:Hector Chang626-458-7038hchang@dpw.lacounty.govFor survey-related questions, contact:Charles Springstun626-320-9896cspring@dpw.lacounty.govThe following resources can be used to obtain historical benchmark data:PUBLIC RECORDS COUNTER900 S. Fremont Ave, 4th FloorAlhambra, CA 918037:00 AM to 5:00 PM Mon – ThursPhone: (626) 458-5137OPTIONAL TECHNICAL RESEARCH (OTR)7:00 AM to 5:00 PM Mon – ThursPhone: (626) 458-5131

This web mapping application provides access to geodetic control for Kentucky as maintained by the National Geodetic Survey and the Kentucky Transportation Cabinet. Links to monument data sheets can be found in the popups for each control point.

Dataset from null. For more information, visit https://data.gov.sg/datasets/d_c7b6903a860cb8a28bf0d8c39e2abfc4/view

Horizontal and vertical control network is planned to laid by fixation of Forced Centric Devices over Larsemann Hill Area. These Devices will enable direct installation of GPS antenna over point and reduce vibration and deviation caused by heavy wind and gusts occur while long duration observation. This network will be useful for further mapping works and other scientific activities.

A point feature class of surveyed Vertical Control Points primarily within Miami-Dade County. To provide surveyors elevation information for specific locations and to identify control points for mapping and application purposes.Updated: Monthly The data was created using: Projected Coordinate System: WGS_1984_Web_Mercator_Auxiliary_SphereProjection: Mercator_Auxiliary_Sphere

Dataset from Singapore Land Authority. For more information, visit https://data.gov.sg/datasets/d_5fbd2c9e018ed9f787b20d9a336043dd/view