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PLSS Section Boundaries

Layer Thumbnail Map

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 namePLSS Section Boundaries
File nametrs
Spatial domainPima County
Abstracttrs displays the smallest unit in the Public Land Survey System; Township/Ranges are subdivided into 36 Sections; each Section is approximately one square mile. These polygons are maintained in the Parcel Fabric.

This layer has been adjusted to Section corner data from the GIS parcel Section AutoCAD drawings. It also includes the half Township South of 12S14E Sections 31-34, designated as 12F14E (field TR).

TOWNSHIP and RANGE field values are four characters where the last two characters indicate the direction where 01 is North, 02 is East, 03 is South and 04 is West. See more information.
Known errors/qualificationsThe Canoa Land Grant area is not part of the Public Land Survey System. The trs layer includes sections in the Canoa Land Grant area as if it had been included in the survey.

2021 - This layer contains a Stated Area field in square miles. This is a GIS calculated estimate and should not be used in place of official stated areas from the original documents.
Feature typepolygon
Feature count 9,310
Thumbnail Map trs.pdf PDF file format   (805,630 bytes, PDF created 12/09/2022 )
ProjectionNAD83 HPGN (Parameters)
Field/value metadata Field metadata
Source organizationALRIS
Source contact
Source document or file name
Source date1988
Source scale 1:24,000
Source formatCoverage
Second source namePima County DOT
Second source contactSteve Whitney
Second source document or file name
Second source date1992
Second source scale
Second source formatDatabase
Date of last data update
(This date may not be current.)
Last data update byGary Szilagyi
Date/time last touched - Meaning? 2022-12-09  01:16 AM - Enterprise GDB - Library input format
  2022-12-09  03:23 AM - Shapefile
  See coverage files, if any, for date.
LineageThe TRS layer for Pima County was extracted from a state-wide layer of PLSS Section boundaries as received from ALRIS. The ALRIS layer was tablet digitized from USGS 7.5 minute topographic quadrangle paper maps.
In 1992, a database of Section corner locations was acquired from ADOT, and the TRS layer was adjusted to match those ADOT Section corners that were surveyed to an acceptable level.
In 2010, the Section boundaries were adjusted to Section corner locations from the GIS parcel AutoCAD drawings.
In 2021, the section boundaries were converted from AutoCAD .dwg to feature class, and maintained in the Parcel Fabric.
On maintenance?Yes
Maintenance organizationPima County ITD
Maintenance frequencyVaries
Maintenance descriptionBoundaries are updated on a case by case basis, usually to be in congruence with parcels that border Sections, and occasionally to reflect the traverse information found on official documents.
Original conversion byALRIS
Pima County ITD GIS contactSteve Whitney
Alternate Pima County ITD GIS contacte-mail address
On  Pima County Geospatial Data Portal? Yes

See Metadata Field Descriptions.
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