All posts by Chris

Downloading Mesa County Ortho Photography

New Imagery & Data Download Website:

Access to historical imagery and elevation data is easier than ever with the updated version of the Imagery & Data Download site.
Data Download Page
Many internal and external customers including private engineers, planners, and consultants can benefit from the enormous amounts of aerial and elevation data that can be accessed from this new site. Mesa County has always maintained the viewpoint that the data is already owned by the public and should be available at no cost to them as the customer.  This application is one tool to help on various mapping and planning projects.

To access aerial & elevation data go to and use the following 3 steps:

  1. Click on the Aerial Imagery & Elevation category.
  2. Use the “Choose Dataset” dropdown menu to select the desired dataset. Optionally, use the “Search Address” tool to find a specific area. You can zoom in and out on the map by using the roller on the mouse or use the zoom tools in the upper left corner of the map.
  3. Interactively select up to 3 tiles within the index on the map. Tiles can be removed by clicking them again or by clicking the “Remove Tiles” button.
  4. Once selected, the index for that specific dataset will appear and indicate its area of coverage on the map.
  5. Once your selection is complete, use the “Download Tiles” button to save them to your computer.


Using Microsoft Silverlight Web Applications on a Mac

Update: This post was published when Mesa County still used the Microsoft Silverlight plugin for its online map viewer. We have since moved on from Silverlight platform so the information presented here should be considered outdated and for historical information only.

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The following instructions are specific to Silverlight version 5.x. For applications using Silverlight 4.x, see the Microsoft compatibility chart.

The question often arises, whether online GIS maps requiring the Microsoft Silverlight plugin can be used on a Macintosh?  The answer is yes, but a few factors need to be addressed.  One very important factor is the operating system and version number on the Mac.  The OS version has to be Macintosh OS 10.5.7 (Intel Based) or greater.

To find which operating System version and build information is on a Mac, go to the “Apple” ( ) menu and choose “About This Mac” and click the Version number.
See for more information.

You also have to use a supported browser to use Silverlight.  The supported browsers are Firefox 12+ and Safari 4+. See the Microsoft’s Compatible Operating Systems and Browsers.

Having the proper version of the Silverlight Plugin is also necessary depending on the version used by the map viewer application. You must have the same version or a later version.  Visit the Microsoft website to download the current published version.

Mesa County Blog

The Mesa County GIS blog is a great opportunity for residents of Mesa County Colorado to gain better understanding of what the GIS department does, why it is important and how it can benefit them.

Geographic information systems (GIS) are the driving force behind almost all digital mapping and spatial applications throughout the world.

Here in Mesa County, our GIS supports both internal County departments and external businesses and individuals.  Uses can include anything from retrieving Assessor data for County parcels to planning a mountain bike adventure.

You can access our interactive GIS maps by following this link: