These images are centered on the Clinton County Courthouse located at 46 S South Street Wilmington, Ohio.

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How do we Do It?

Processing the Imagery...

We are on occasion asked about the process used to create the older imagery you can find on this web page.

First, we start with scanning. Each of the 136 images (as in the 1968 Imagery Collection) were scanned into a colored tiff image, at 300 DPI (dots per inch).

Each image ends up between 135 and 145 MB in size, which is simply to large to work with on most computer systems and software. The final image that is distributed by the GIS Department is in MrSID file format, which is a compressed version  of the original rectified tiff image. Usually the tiff images go from 145 MB to about 5 MB as a MrSID image.

The individual images are converted to a MrSID file format and made available on the web pages for each year.

You can click on file name on the index map and see the MrSID image for that particular area. One of the neatest things that you can do is look at the index in Google Earth (where available) and see the MrSID image and the Google Earth image at the same time, in different windows.

Raw Scanned Image

Original Index

1968 Imagery Index

Rectified Image

Clipping a Rectified Image

Rectified, Clipped and Squared Image

This is scanned image, exactly as the original appeared. You can see the date the image was taken in the upper left, and index numbers in the upper middle and upper right corner.

This is the original index as it existed in 1968.

This was created after each of the images were rectified.

This is an image that has been "rectified", or given real-world coordinates. Plase note the street centerlines in purple.

After rectifying the image, it is clipped square using special software. This screenshot shows a red line that was used to clip (crop) the rectified image into a square.

This image is then converted to MrSID format.

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Raw Scanned Image

This is scanned image, exactly as the original appeared. You can see the date the image was taken in the upper left, and index numbers in the upper middle and upper right corner.

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USDA Geospatial Data Gateway

NAIP - National Agriculture Imagery Program

-    Fact Sheet

Summary
The Geospatial Data Gateway or Geo-Data Gateway provides easy and consistent
access to natural resource data. You can search for available data by
geographic area such as county or state, use our point and click map tool to
find your area of interest; using a gazetteer, or by entering latitude and
longitude coordinates. You can also search for data by theme, such as digital
ortho imagery, digital elevation models (DEMs), or soils. You can then view a
thumbnail, or sample of the data you've chosen to know if you want a copy of
the data. If you do, you can either download the data directly onto your
machine, pick it up via our FTP site, or order it on media such as CD.

Click on the screenshot below to go to the web page:

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