• Increase font size
  • Decrease font size
  • Print
  • RSS
  • Basemap Metadata

    A basemap is a collection of GIS data and/or orthorectified imagery that form the background setting for a map. The function of the basemap is to provide background detail necessary to orient the location of the map.  Basemaps also add to the aesthetic appeal of a map.  Typical GIS data and imagery that make up the layers for a basemap include: landforms, roads, landmarks, and political boundaries.  Basemaps are used as background information over which other thematic or operational information (layers) is placed.

    Pima County basemaps are not used to drill down to more information; they are used as a reference aid. They are made up of JPEG or PNG image tiles which are created at various scales (13 scales: 2,000,000 - 300 square feet).

    Pima County basemaps (excluding the imagery basemap) are updated infrequently. In comparison, any modification made to an operational layer should be reflected on PimaMaps the next day. Also, operational layers are clickable and allow users to display further information about the data.  The SP at the end of each basemap name refers to State Plane projection.

    Our current system offers users 5 basemaps:

    1. BaseMapAnno_SP (Basemap Labels) - a layer consisting mainly of annotation (labels) designed to be displayed on top of the other basemaps.  The basemap displays Pima County features from the following GIS Layers:
      Last Updated: 6/7/2019
      • County Boundaries
      • Urban Areas
      • Streets
      • Major Washes
      • Parks (local and Federal)
      • Various Cultural Features:  shopping malls, museums, local sites of interest, government buildings and schools
      • Indian Reservations
      BaseMapAnno_SP
    2. StreetBaseMap_SP (Street Basemap) - main feature reference layer, displaying Pima County features from the following GIS Layers:
      Last Updated: 6/7/2019
      • County Boundaries
      • Urban Areas
      • Streets
      • Major Washes
      • Parks (local and Federal)
      • Various Cultural Features: shopping malls, museums, local sites of interest, government buildings and schools
      • Indian Reservations
       StreetBaseMap_SP
    3. GreyCanvasBaseMap_SP (Grey Canvas Basemap) - a muted layer displaying Pima County features from the following GIS Layers:
      Last Updated: 6/7/2019
      • Urban Areas
      • Railroads
      • Streets
      • Major Washes
      • Parks (local and Federal)
      • Various Cultural Features: shopping malls, museums, local sites of interest, government buildings and schools
      • Indian Reservations
      GreyCanvasBaseMap_SP
    4. OrthobaseHybridNoAnno_SP (Imagery Basemap) - a layer displaying Pima County Imagery available for various extents/areas:
      Last Updated: 4/30/2019 
      • 2018 and 2016 Pictometry (3-inch and 9-inch resolutions)
      • 2011 and 2015 PAG (Pima Association of Governments, 6-inch resolution)
      • 2017 NAIP (National Agriculture Imagery Program, 2-foot resolution)

      OrthobaseHybridNoAnno_SP
    5. TopoBaseMap_SP (Topography Basemap) - a basemap emphasizing relief features/surface configuration for Pima County. It was created from the following layers:
      Last Updated: 12/24/2018 
      • Contour (10 ft/ 2 ft) for most of Eastern Pima County. The contour lines were digitized from USGS Quad maps. Contour interval varies throughout the coverage depending on the original quad sheet contour interval.
      • Geographic Place Names. This layer originates from the USGS Geographic Names Information System (GNIS).
      • 2010 NAIP (National Agriculture Imagery Program) - vegetation values.
      • Pima County 10 Ft Hillshade generated from a Digital Elevation Model. For more information please see imagery metadata.
      • County Boundaries
      • Railroad Lines
      • County Streets
      • Major Washes
      • Various Cultural Features: shopping malls, museums, local sites of interest, government buildings and schools and Indian Reservations.

      TopoBaseMap_SP
      The Topography Basemap is updated once a year. Its focus is on contour lines and natural areas/features which do not change very often. It does contain streets and they are there to help orient the user. Please note for updated streets data please turn on the Streets dynamic layer in the table of contents.

    Follow UsShare this page

    Geographic Information Systems

    33 N. Stone Ave., 15th Fl.
    Mail-Stop Code DTBAB17-425
    Tucson, AZ 85701

    Phone: (520) 724-6670
    Fax: (520) 791-6588


    Department Home Page
    Department News
    Department Directory
    Department Feedback Form
    Maps