Left Photo:
Right Photo:
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Current Map View
Side by side images based on the selected Left and Right aerial photos.
Time Sequence of All Years
A collection of images that range from 1936 to the present for the viewable map area.

Significant improvements in technology has increased the accuracy and clarity of aerial photography. This section provides information about each collection to assist you in understanding their appropriate use.

1936
- Black and White
- Uncontrolled Mosaics: location comparisons should be done with caution.
The original photos are roughly 2 feet by 3 feet in size and bound to a fabric medium. The original photos were printed at a scale of 1 inch = 1000 feet. These fabric mounted aerial photos were digitally scanned, geographically aligned, and then mosaiced together to form one large image.

1940's
- Black and White
- Uncontrolled Mosaics: location comparisons should be done with caution.
The collection is comprised of partial flights from 1941 (covers the south eastern portion), 1942 (covers the northeastern portion), 1947 (covers the northwestern portion), and 1948 (covers several portions). A portion of the south-west area of the County does not have aerial photos from the 1940's. The original photos were roughly 9" by 9" on paper stock. They were scanned, geographically aligned, and mosaiced to produce a single layer.

1955
- Black and White
- Uncontrolled Mosaics: location comparisons should be done with caution.
Printed on paper at a scale of 1" = 1000'. The original paper photos are roughly 20" x 20" in size. They were scanned, geographically aligned, and mosaiced to produce a single layer.

1970
- Black and White
- Uncontrolled Mosaics: location comparisons should be done with caution.
The original prints are 9x9 inches. Printed on paper at a scale of 1" = 1000'. They were scanned, geographically aligned, and mosaiced to produce a single layer.

1980
- Black and White
- Uncontrolled Mosaics: location comparisons should be done with caution.
The original prints are 9x9 inches. Printed on paper at a scale of 1:12,000. They were scanned, geographically aligned, and mosaiced to produce a single layer.

1990
- Black and White
- Uncontrolled Mosaics: location comparisons should be done with caution.
The original prints are 9x9 inches. They were scanned, geographically aligned, and mosaiced to produce a single layer.

1994
- Color Infrared
- Controlled Mosaics: location comparisons should be done with caution.
The originals are digital MrSid tiles. They were geographically aligned, and mosaiced to produce a single layer.

2000
- Color
- Orthophotography.
Captured at a resolution of 7.5 inches. Image horizontal accuracy is within 3.25' at the 95% confidence level.The imagery covers the entire County with the exception of a small sliver in the Town of North East.

2004
- Color and Color Infrared versions
- Orthophotography.
Captured at a resolution of 12 inches. Image horizontal accuracy is within 4' at the 95% confidence level.

2009
- Color and Color Infrared versions
- Orthophotography.
Captured at a resolution of 6 inches. Image horizontal accuracy is within 3' at the 95% confidence level.

In this section we cover the basics of terminology and interpretation of aerial photography. Photo interpretation is a balance of science and experience.

Aerial Photo 'Color'

Black and White. Click to enlargeSelf explanatory. These have been in use since the 1930's.

True Color. Click to enlargeThey show the 'natural' color of the landscape. They tend to be good for water penetration and discrimination of underwater features.

Color Infrared (also known as false color). These were first developed to detect camouflage. Click to enlarge They are sensitive to near infrared reflective light (not heat). This results in 'seeing' healthy vegetation as red. Vegetation with very active photosynthesis will appear the brightest red. Color infrared images are superior for mapping the land-water interface as well as for wetlands mapping.

Click to enlargeIt also images water in light blue/green to dark blue/black hues, depending on the amount of particulates suspended in the water body. Clear, clean water will appear very dark, close to a black tone. As sediment content increases the shades shift to blue color tones. The darkness of the soil tones provides information regarding the moisture content of the soil, darker areas containg more moisture.


Basic Terminology

Mosaics. A series of overlapping air photos

Uncontrolled Mosaics. A series of overlapping air photos which have not been aligned to ground control points.

Controlled Mosaics. A series of overlapping air photos that have been rectified and aligned with ground control points, to allow planimetrically-correct distance measurements.

Orthophotography. These combine the planimetric precision of a map with the detail available in an aerial photograph. Accurate measurements of distance, area and directions can be made. However the resolution of the aerial photograph should be accounted for to account for precision.

Resolution. Digital aerial photography resolution is generally expressed as the amount of area covered by one pixel. For example imagery with a one foot pixel resolution will cover one foot of ground in each pixel.

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