Showing the way with superb digital and print mapping solutions

  • Check out our Mapbox GL HOT OSM style for Tegola

    Ctrl + left-click to change the map pitch!

  • Analysis

    PetersonGIS got its start in 2001, creating salmonid refugia maps for several counties in Washington State. This led to work with NOAA, creating Chinook critical habitat maps, and with the Hood Canal Coordinating Council, working on forest harvest loss quantification of LiDAR imagery and other salmon-related habitat analyses.


    Many clients and many projects later, PetersonGIS continues to be passionate about natural resources spatial analysis.



    PetersonGIS has always been interested in map data visualization techniques and avant-garde design, especially as these techniques further our customer's understanding of their data and further their message to their own customers. We've made hundreds of maps and written a few textbooks on cartography that are used in university classrooms around the world.


    Map design tools are in a constant state of flux and continual improvement by many organizations and vendors. We keep our eye on the latest developments in the spatial field to make sure your needs are met to the fullest. Tools we're loving: Maputnik, Mapbox, OpenLayers, QGIS, ArcMap, Inkscape, D3.js, SLD, Imposm3, and Git for collaborative cartography.

  • Digital Mapping

    We create custom designed, interactive basemaps for the entire world at all zoom levels. We work with you on your hosting needs for these basemaps, whether they will be stand-alone or embedded within an existing site.

  • Community Involvement

    We love to be a part of the spatial community! See the instructional live-demo on how to make this map in our FOSS4GNA presentation and the accompanying written tutorial presented and tested at Boulder Maptime.

  • Where We Hang Out




    Our Videos

  • News

    We are:

    • helping OSGeo with cartography branding documents.
    • creating basemap styles with the new opensource vector tile styler called Maputnik. See one of our styles at the top of this site.
    • contributing to the Hood Canal pollution identification and correction program. See the maps and apps we designed here.
    • producing high quality cartography of world-wide hillshade, aspect, and other raster data using SLD/Geoserver for our clients.

    We were recently:

    • guest teaching on cartography in digital map design at Front Range Community College.
    • judging the GeoHipster 2017 map calendar competition.
    • holding the first ever geo flash conference. See the recording of this highly successful mini conference that was announced and convened in the space of one hour!
    • telling everyone about QGIS Map Design, released in March 2016 by LocatePress and co-authored by Anita Graser and Gretchen Peterson.
    • celebrating the our newest book City Maps: A Coloring Book for Adults, which is selling widely and wildly! It was even featured in The Atlantic's CityLab and The Guardian.
    • giving one of the most-viewed talks at the FOSS4GNA conference in May 2016.
    • giving a workshop and talk at the Manitoba Planning Conference in May 2016 and providing training to the Manitoba Community & Regional Planning department.
    • profiled in an Atlantic's CityLab article about the "extraordinary women making maps today."
    • giving an all-day cartography workshop in Sacramento on April 20, 2016 for Norcal URISA.
    • updating our entire resources list for aspiring cartographers in January 2016. This list has been periodically updated since 2009 and we're proud of it!
    • keynoting the Manitoba GIS User Group Fall Conference on October 7, 2015. Check out the slides.

  • Contact Us

    Feel free to let us know what you need!