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Countywide Imagery Now Available

Jul 15

Written by:
7/15/2016 2:54 PM  RssIcon

Background
2010 was a big year for the NC OneMap program and included two "firsts."  One was the initial release of the Geoportal; the state's first application dedicated to providing access to North Carolina's geospatial data. The second was the release of the first-ever statewide collection of high resolution imagery.

For us, back then, we were moving into uncharted waters. Sure, we had plenty of data sets already in NC OneMap that people used on a regular basis but this was different. Imagery was going to be a game changer in terms of popularity and use. People were asking about when it was going to be available shortly after the planes landed so we knew that people really wanted to get their hands on it, like yesterday.

Would our server survive the onslaught? We weren't taking chances.

Among other things, one of our main concerns was our server. Was it going to hold up to the new demand? Would it continue to happily serve the masses or would it end up in a pile of melted plastic and wires? We knew that a pile of ash was not a good thing so we took measures to prevent its' demise. One thing we did was to restrict the amount of imagery that could be downloaded at a single time. In 2010, the maximum size was set to 20 tiles (~18 sq. miles).

The maximum imagery download area has increased over time.

Over time, we realized that our server was doing just fine so we increased the size in 2014 such that you could download up to 80 tiles (~72 sq. miles). This seems to be enough for most people. But there are still a few customers who need to download even larger areas. Sure, you can still send us a hard drive and we are happy to load it up for you but we (ahem) don't want you to have to do that. Starting this week, we have added the ability to download the most recent countywide image mosaics from the GeoPortal.

 

What Is It?

The NC Orthoimagery Program produces imagery each year for a different portion of the state. The product is a collection of image files / tiles. Each tile covers a 5,000' x 5,000' area. These are what are included in the zip file that you download when you use the Download Imagery page on the GeoPortal. A countywide mosaic file, on the other hand, is a single image file that has been created by combining the tiles, or mosaicking them together, to give countywide coverage. The download files are in .zip format and include the county mosaic file (.sid) and the accompanying world file (.sdw). Each county has one download file and contains the most recent imagery for that particular county.

 

How Do I Get It?

Visit the GeoPortal and search using the terms  mosaic, county, imagery, etc. The name of the resource is Latest Orthoimagery County Mosaic Downloads. Click on the title to expand the description and then click Download/Open. Select your county(ies). Happy downloading!

Imagery available by county from the GeoPortal.

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 News Minimize
Feb '16 - 2015 Imagery Online
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