This layer contains the data for the survey control points and benchmarks for the City of Round Rock, located in Williamson County, Texas. This layer is part of an original dataset provided and maintained by the City of Round Rock GIS/IT Department. The data in this layer are represented as points. A survey benchmark is a reference point that is used to calculate something. A benchmark, in surveying, can be referred to a permanent mark created at a recognized height which is used as the basis for measuring different altitudes of topographical points.A survey control point is an accurately surveyed coordinate location for a physical feature that can be identified on the ground. This layer contains information about each point's type, project title, firm, location, date, and vertical datum used if applicable. Prior to the digitization of these survey benchmarks and control points, a previous survey was completed in 2004 which established 41 control points throughout the city. Those points have been added to this layer, but you can still view their documentation in the following paragraph:Find the control point nearest your area to determine the corresponding data sheet, and find the download link below. You can also download the monument coordinates and report synopsis.GPS Point Data Sheets:01-001 01-002 01-003 01-00401-005 01-006 01-007 01-00801-009 01-010 01-011 01-01201-013 01-014 01-015 01-01601-017 01-018 01-019 01-02001-021 01-022 01-023 01-02401-025 01-026 01-027 01-02801-029 01-030 01-031 01-03201-033 01-034 01-035 01-03601-037 01-038 01-039 01-04001-041

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.

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 data is extracted and selection done for Volusia County, Fl. 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 the public facing survey control points for Lake County. These are the "control points" that are recognized by surveying or other land management marker.

The Datum of the majority of the City of Sacramento benchmarks is the National Geodetic Vertical Datum of 1929 (NGVD 29) and was based upon a plane datum with reference to four U.S. Government monuments. Some North American Vertical Datum 1988 (NAVD 88) differential baselines have been conducted and the elevations of those benchmarks have been included and identified in this database.VERTICAL CONTROL DISCLAIMER AND GENERAL USE DISCLAIMER City of Sacramento Vertical Control Network, also known as “City of Sacramento Datum” information, is furnished by the Department of Public Works - Engineering Services. It was developed and collected for the purpose of establishing reference points for all survey activities within Sacramento City limits. City of Sacramento makes no warranties, expressed or implied, concerning the accuracy, completeness, reliability, or suitability of this data for any other particular use. Furthermore, the City of Sacramento assumes not liability for any errors, omissions, or inaccuracies associated with the use or misuse of such data. The City of Sacramento tries to keep this information current and accurate.If you find a missing or destroyed City of Sacramento benchmark please contact the City Land Surveyor by calling (916) 808-8777.

ACCEPTABLE USE The City of Sacramento Datum (unadjusted NGVD29) local benchmarks provided here are acceptable as City of Sacramento benchmarks for the purpose of establishing and extending vertical control to design surveys. Reference Sacramento City Code, §1.12.010.All information compiled on this website is provided as a public service and for general informational purposes only. In preparation of these pages, every effort has been made by the Department of Public Works - Engineering Services to offer the most current, correct and concise information possible. The City of Sacramento and its authorized agents and contractors disclaim any responsibility for typographical errors and accuracy of the information that may be contained on the City of Sacramento website; www.cityofsacramento.orgBy accessing the information, data, materials and links contained in the City of Sacramento World Wide Web pages, you hereby agree to and accept the following terms and conditions: The Department of Public Works - Engineering Services shall not be liable for the improper or incorrect use of data, information, materials, links or related graphics described and /or contained herein. The Department of Public Works - Engineering Services shall not be liable for any demand claim, regardless of form or action, arising out of or incident to the posting of information or data on this website; the accessing or use of any information or data on this website; and/or the acts or omissions of any person or entity accessing or using any information from this website.The user hereby recognizes that the information, data, materials and related graphics are dynamic and may change over time without notice. The Department of Public Works - Engineering Services is not responsible for the use or reliance upon this information. There are links and pointers to third party internet websites contained in the City of Sacramento website. These sites linked from the City of Sacramento website are not under the City’s control. The City of Sacramento and its authorized agents and contractors do not assume any responsibility or liability for any information, communications or materials available at such linked sites, or at any link contained in a liked site. Each individual site has its own set of policies about what information is appropriate for public access. User assumes sole responsibility for use of third party links and pointers.

The database is a set of entities and attributes as referenced to individual geographic locations, hereafter referred to as "Point". Each individual Point has a location relative to all other points in the database as referenced to a coordinate grid. The relative location of the points as represented in this database correspond to the physical or determined locations of Survey Control Monumentation.

This spatial data set contains points representing the locations of survey control monuments in the City of Welland. Marker types include MTO, Survey Control Points, Global Positioning Monuments, Benchmarks.

ABSTRACT:Benchmarks are used in land surveying to extablish well known control points of elevation, latitude, and longitude with which to survey surrounding land. The benchmarks in this feature class represent bechmarks used and established by the City of Victorville Engineering Department.PURPOSE:This data is intended for geographic display and analysis at the local government level. This data should be displayed and analyzed at scales appropriate for 1:100,000 scale data. No responsibility is assumed by the City of Victorville for the use of this data.SUPPLEMENTAL INFORMATION:These points are a reprentation of reality and are for visual display only. Data users should not use the point found herein for actual land surveys.LAST UPDATED:March 2, 2017

This feature class is maintained to keep construction, mapping and all city services in and adjacent to the city on the same vertical datum. Thus minimizing mistakes or conflicts in construction or maintenance of the infrastructure of the city. This feature class represents the cities vertical control network which was started approximatley in 1971. The oringinal bench mark used to start the network was a NGS (Nationa Geodetic Survey) monument located in the northwest part of the city (Stapleton Airport/Peoria and Smith). Level loops and runs were added and extended as the city grew. Which also incorporated more NGS monuments. The datum used when the program started was NGVD (National Geodetic Vertical Datum) of 1929 . In June of 2006 the city converted from NGVD 1929 to NAVD (North American Vertical Datum) of 1988 using Corpscon 6.0.1 and the Geoid 2003. This network has been successful and should be maintained until a improved alternative can be utilized.

Environment Agency Control Stations (EACS) or Benchmarks (EABMs) have been created since the 1990s for use as survey control for Environment Agency projects. Control stations are fixed locations in the country which have been accurately surveyed using GPS / GNSS data. Our control stations are often near Environment Agency structures and they are used as reference heights for many different types of surveys which are carried out near the control stations. The control stations are graded with different levels of accuracy due to the varied survey techniques that were used in establishing the points. Attribution statement: © Environment Agency copyright and/or database right 2016. All rights reserved.

This feature class represents the locations of survey monuments in the City of Austin and surrounding counties. Survey monuments are also referred to as "control points". These survey monuments are being placed throughout the City of Austin and surrounding counties to aid in surveying.

Point geometry with attributes displaying geodetic control stations (benchmarks) in East Baton Rouge Parish, Louisiana.Metadata

This dataset contains vertical benchmark data for the City and County of Denver. Monumentation for this dataset includes U.S. Coast and Geodetic Survey (USCGS), National Geodetic Survey (NGS), and City and County of Denver (CCD) benchmarks. Elevations for bench marks are typically determined by standard differential leveling activity. NGS High-Accuracy Reference Network (HARN) points are portrayed in the ENG_SRVNGSHARN_P dataset.

Survey monuments, also called survey marks, survey markers, survey benchmarks or geodetic marks, are objects placed to mark key survey points on the Earth's surface. They are used in geodetic and land surveying.Data are updated by city staff as needed, and automatically copied to the Open Data Portal. The "Last Updated" date shown on our Open Data Portal refers to the last time the data schema was modified in the portal, or any changes were made to this description. We update our data through automated scripts which does not trigger the "last updated" date to change.

The following dataset includes "Active Benchmarks," which are provided to facilitate the identification of City-managed standard benchmarks. Standard benchmarks are for public and private use in establishing a point in space. Note: The benchmarks are referenced to the Chicago City Datum = 0.00, (CCD = 579.88 feet above mean tide New York). The City of Chicago Department of Water Management’s (DWM) Topographic Benchmark is the source of the benchmark information contained in this online database. The information contained in the index card system was compiled by scanning the original cards, then transcribing some of this information to prepare a table and map. Over time, the DWM will contract services to field verify the data and update the index card system and this online database.This dataset was last updated September 2011. Coordinates are estimated. To view map, go to https://data.cityofchicago.org/Buildings/Elevation-Benchmarks-Map/kmt9-pg57 or for PDF map, go to http://cityofchicago.org/content/dam/city/depts/water/supp_info/Benchmarks/BMMap.pdf. Please read the Terms of Use: http://www.cityofchicago.org/city/en/narr/foia/data_disclaimer.html.

Benchmarks are survey markers that provide a point of particular elevation used as a reference for determining elevations of other points in a survey. They are used by surveyors, engineers, planners, and contractors for establishing elevations for planning, designing, and/or construction of various projects.The City of Portland is responsible for establishing and maintaining a network of benchmarks throughout the city, each having a known elevation expressed in feet in the City of Portland’s own datum (established in 1896). Most of the City of Portland’s Benchmarks are brass disks about 2 ½" in diameter, and all are marked "City of Portland Bench Mark No. nnnn " and usually set in the curbs of streets. Occasionally you’ll see larger disks of 3 ¾" diameter which are "Class A" monuments, and some benchmarks are set in retaining walls, bridge wing walls, culvert headwalls, concrete steps, or wherever the most stable and accessible placement was determined to be for a specific location. You might also see benchmarks similar to those of the City of Portland’s but with another governmental agency’s or private firm’s name stamped on it. Occasionally the City of Portland Benchmark Book will refer to these monuments and provide elevations, but more often you’ll have to contact the appropriate institution for more information. The benchmark numbers the City assigned to outside agency monuments are for indexing purposes only; PDOT does not stamp a City of Portland benchmark number on other agencies' monuments.-- Additional Information: Category: Survey Purpose: For mapping and analysis related to the maintenance of survey benchmarks. Update Frequency: As needed-- Metadata Link: https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=53238

Locations of survey monuments (benchmarks). Survey markers, also called survey marks, survey monuments, or geodetic marks, are objects placed to mark key survey points on the Earth's surface. They are used in geodetic and land surveying.

A file geodatabase of survey monumentation features in Yosemite National Park, including monuments (e.g. benchmark disks), control points (e.g. rebar and cap), and destroyed or missing monuments.

Purpose and Use: This dataset was created to help with locating the GPS Benchmarks in and around San Marcos.Data Source: Data in this GPS Survey Benchmarks layer is created and maintained by the City of San Marcos, Texas, Geographic Information Systems (GIS) department.Contact: Geographic Information Systems (GIS): gisinfo@sanmarcostx.govUpdate Frequency: As needed.Jurisdiction: City of San Marcos.Fields:OBJECTID: System-generated unique identifier for each record within the feature class. SOURCE: Organization that provided the data. NAME: Name associated to the GPS Monument by the number at which it was recorded. INSTALLDATE: Date of installation for the real-world feature represented in the feature class. ELEVATION: Elevation recorded during monument placement, above sea level. XCOORDINATE: The horizontal value in a pair of coordinates: how far along the point is. The X Coordinate is always written first in an ordered pair. YCOORDINATE: The vertical value in a pair of coordinates. How far up or down the point is. The Y Coordinate is always written second in an ordered pair. DISTANCE1: This is the footage distance from the described location in 'Distance1Description' field. DISTANCE2: This is the footage distance from the described location in 'Distance2Description' field. DISTANCE3: This is the footage distance from the described location in 'Distance3Description' field. AZIMUTH: An angular measurement in a spherical coordinate system. The vector from an observer to a point of interest is projected perpendicularly onto a reference plane; the angle between the projected vector and a reference vector on the reference plane is called the azimuth. BEARING: The actual (corrected) compass direction of the forward course of the aircraft. In land navigation, a bearing is the angle between a line connecting two points and a north-south, or meridian. DISTANCE1DESCRIPTION: This is the described location from which the distance is collected as a total of 3 location points. DISTANCE2DESCRIPTION: This is the described location from which the distance is collected as a total of 3 location points. DISTANCE3DESCRIPTION: This is the described location from which the distance is collected as a total of 3 location points. ROUTEDESCRIPTION: General description for where the marker is located in reference to known locations. MARKERCATEGORY: The way in which the marker is placed for GPS such as being placed in an aluminum disk set in concrete which is found physically in the ground. MEDIALINK: URL for a website related to the record. PRODUCTIONNOTES: Technical notes from GIS personnel. DESCRIPTION: Statement illustrating the feature. CREATEDBY: Name of the person logged into the system that GIS automatically stamps as the original creator. CREATEDDATE: Date/time stamp from the moment the GIS record was created. MODIFIEDBY: Name of the person logged into the system that GIS automatically stamps as the feature is modified. MODIFIEDDATE: Date/time stamp from the last moment the GIS record was changed. SHAPE: System-generated geometry type of the feature. Shape.len: System-generated length of the feature. GlobalID: System-generated unique identifier for each record that is required in replicated geodatabases.

Mascot geodetic control monuments for BC. Geodetic Control Monuments are a network of interconnected markers in the ground which have accurately determined coordinates, and/or elevations. They are fixed points on which to spatially reference surveys, mapping, aerial and satellite imaging, etc