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GPS Geodetic Control Points - HPGN

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This metadata information is subject to our disclaimer. Metadata information presented here is maintained manually. Therefore, date-sensitive fields such as feature count and date of last update may not be up-to-date. All metadata is subject to errors inherent in a manual process.

Descriptive nameGPS Geodetic Control Points - HPGN
File namegeocntrl
Spatial domainPima County
Abstractgeocntrl displays Pima County and Tucson geodetic control points that are based on a High Accuracy Reference Network (HARN), or High Precision GPS Network (HPGN). HARN is a higher order adjustment of the North American Datum of 1983.

New control points are being established and positions collected and post-processed using OPUS. See more information.
Known errors/qualificationsUnits are international feet. The survey was for controlling the City of Tucson and PAG Orthophoto Project, not for determining whether the monuments represented aliquot corners, or section corners nor to establish horizontal control.
Feature typepoint
Feature count 1,758
Thumbnail Map geocntrl.pdf PDF file format   (578,809 bytes, PDF created 11/28/2022 )
ProjectionNAD83 HPGN (Parameters)
Field/value metadata Field metadata
Source organizationGPS Survey team
Source contactScott Prechtel, RLS
Source document or file name
Source date20020924
Source scale
Source formatDatabase
Date of last data update
(This date may not be current.)
Last data update byScott Prechtel
Date/time last touched - Meaning? 2022-11-28  12:37 AM - Enterprise GDB - Library input format
  2022-11-28  02:02 AM - Shapefile
  See coverage files, if any, for date.
On maintenance?Yes
Maintenance organizationCOT Survey Section
Maintenance frequencyVaries
Maintenance descriptionCity of Tucson updates the SURVEY.dbo.hpgps table with new values for observed stations or adds new geodetic control stations and session sheets.

This layer is derived from the GIS SQL Server SURVEY.dbo.hpgps table which is the master and source.
Original conversion byITD-GIS
Pima County ITD GIS contactJack Avis
Alternate Pima County ITD GIS contacte-mail address
On  Pima County Geospatial Data Portal? No

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