GIS Library Contents - MetadataGPS Geodetic Control Points - HPGN |
This metadata information is subject to our disclaimer. Metadata information presented here is maintained manually. Therefore, date-sensitive fields such as date of last update may not be up-to-date. All metadata is subject to errors inherent in a manual process.
Descriptive name | GPS Geodetic Control Points - HPGN | |
File name | geocntrl | |
Spatial domain | Pima County | |
Abstract | geocntrl 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/qualifications | Units 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 type | point | |
Feature count | 1,758 | |
Thumbnail Map | geocntrl.pdf (386,552 bytes, PDF created 03/25/2024 ) | |
Projection | NAD83 HPGN (Parameters) | |
Rectification | n/a | |
Field/value metadata | Field metadata | |
Source organization | GPS Survey team | |
Source contact | Scott Prechtel, RLS | |
Source document or file name | ||
Source date | 20020924 | |
Source scale | ||
Source format | Database | |
Date of last data update (This date may not be current.) | 20170214 | |
Last data update by | Scott Prechtel | |
Date/time last touched - Meaning? | 2024-03-25 12:27 AM - Enterprise GDB - Library input format | |
2024-03-25 06:10 PM - Shapefile | ||
See coverage files, if any, for date. | ||
Lineage | ||
On maintenance? | Yes | |
Maintenance organization | COT Survey Section | |
Maintenance frequency | Varies | |
Maintenance description | City 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 by | ITD-GIS | |
Pima County ITD GIS contact | Jack Avis | |
Alternate Pima County ITD GIS contact | ||
On Pima County Geospatial Data Portal? | No |