NGS has traditionally used only airborne
photography for its mapping missions. However, the advent of high resolution
spaceborne imagery may be useful for precision mapping projects. NGS has
recently used spaceborne imagery as a reconnaissance tool to evaluate the
temporal accuracy of previously compiled shoreline data.
This image shows a SPIN-2
scene of Tampa, Florida, acquired from Microsoft's TerraServer. The spatial
resolution of this image is approximately 2 meters. The vectors overlayed
on the scene are different representations of the Mean High Water line.
This experiment illustrates the value of using commercial spaceborne imagery
to evaluate the temporal accuracy of NOAA's shoreline data. The SPIN-2
scene was imaged in 1998. After comparing this scene to the charted shoreline,
NGS dispatched an aerial mapping mission to acquire high resolution metric
photography of the area. The yellow vector represents the shoreline as
it existed in July 1999.
|SPIN-2 Image of Tampa Florida
NGS is experimenting with a wide variety
of spaceborne commercial imagery to conduct similar studies of shoreline
IRS Image of Charleston,
|The image at left is a 5 meter resolution
IRS scene taken over Charleston, South Carolina. The imagery was purchased
from Space Imaging
to facilitate research into shoreline mapping using spaceborne data sources.
See more information about the Tampa, Florida