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2013 Orthoimagery is Now Available

Feb 4

Written by:
2/4/2014 1:44 PM  RssIcon

We are pleased to announce that the orthoimagery collected in 2013 for the Eastern Piedmont section of North Carolina is now available online from the NC OneMap Geospatial Portal. As in previous years, this imagery is available as a web service and via download. Just like in 2010 and 2012, the 2013 orthoimagery is true color imagery and has a pixel resolution of 6 inches. This means you can zoom into about 1:575 before the imagery starts to lose clarity. However, individual pixel values may have been slightly altered during image processing. Therefore, this data should be used for general reference and viewing rather than hardcore image analysis.

campbell_university_football_image dbap_image

 

Imagery in Web Services - We do the processing so you don't have to
There is a lot of good information about how to use the imagery available from NC OneMap on our FAQ page. We also have tutorial videos on the home page of the Geoportal that show how to configure connections to our web services using GIS (e.g., ArcGIS, QGIS, Gaia) and CAD (e.g., Autodesk, Carlson, Microstation) software. It's definitely worth a few minutes of your time to take a look at these resources. One of the most important things to realize is that this imagery is contained in several different web services. Which one should you use in your work? Read the descriptions below to find out:

  • Orthoimagery_2013: Imagery for the 25 Eastern Piedmont counties of North Carolina (coverage map)
  • Orthoimagery_Latest: An image service showing the latest imagery available for any given location in NC (including 2013). This is the most versatile service (supports hundreds of map projections) and is a seamless statewide coverage.
  • Orthoimagery_Latest_cached: An image service that shows the same imagery as "Orthoimagery_Latest." However this image service is cached for improved performance. Zoom levels are pre-defined and is limited to the "web mercator" projection. Best used when building custom web applications. Overlays correctly with other common web maps from Bing, Google, and Esri.
  • Orthoimagery_All: All the imagery collections (1996-2013) in one image service. This service is time-enabled which allows for time-series change analysis. However, there is a tradeoff in that the performance is a bit slower than the other services due to the huge number of individual images.
  • Ortho_boundaries: A map service showing the coverage extents for all collections of imagery.

Downloading Imagery - When you absolutely, positively just got to have it locally
Although there are many advantages to using the services (we encourage you to use this method whenever feasible), we realize that there are cases where you may prefer to download it. If this is the case then visit the "download imagery" page on the NC OneMap Geospatial Portal. Please keep in mind that we restrict you to about 65 square miles per download (45 tiles) due to bandwidth concerns. If you need larger areas of imagery then you can contact us to arrange a data transfer (hint: you're going to need to send us a hard drive). The 2013 imagery is produced as part of the ongoing NC Orthoimagery Program.

Imagery collection is already underway for 2014 and is expected to be online this time next year. As always, we welcome any comments you may have and are happy to answer any questions. Just shoot us an email.

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