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About Terrestrial Remote Sensing


> What is Terrestrial Remote Sensing?
> Why Use Remote Sensing Techniques?
> What We Do
Click on thumbnail images to access larger version of image.

Landsat TM of Northern Arizona, 610 kb
Northern Arizona:Landsat TM image, 245 color composite. June 22, 1991. (610 kb)
What is
Terrestrial Remote Sensing?

Terrestrial Remote Sensing (TRS) deals with gathering information about the Earth from a distance. This can be done from a few meters off the Earth's surface, an aircraft flying hundreds to thousands of meters above the surface, or a satellite orbiting hundreds of kilometers above the Earth.


In the coastal and marine environment remotely sensed images of the seafloor are collected using sidescan- sonar imaging systems towed in the water by a ship. The remotely sensed images are usually in digital form which allows them to be manipulated, processed, enhanced, and analyzed using an image processing software package. All of our digital image processing and analyses of remotely sensed and DEM digital images are done using the USGS MIPS package developed by us over the past 20 years.

Color Coded SPM Image from Landsat TM, 110 kb
San Francisco Bay Area:Color coded suspended particle matter (SPM) image generated from Landsat TM. (110 kb)

Landsat TMs of San Francisco's South Bay, 575 kbChange Detection:Landsat TM images of San Francisco's South Bay area displaying (left to right) 1984, 1993, and change images. (575 kb)
Why Use
Remote Sensing Techniques?

Relative to surface sampling, remotely sensed satellite, airborne, and shipborne images have improved spatial coverage that can help study, map, and monitor the Earth's surface at local and/or regional scales. Advantages offered by remotely sensed image data include:
  • a synoptic/regional view compared to ground sampling,
  • cost effectiveness,
  • high spatial resolution and coverage compared to ground sampling, and
  • relatively high temporal coverage on a long-term basis.

Remotely sensed image data can be used by themselves or are often merged with other spatial data, such as Digital Elevation Models (DEMs) or bathymetry data. The DEMs and bathy data are converted into raster images and can be manipulated, processed, enhanced, and analyzed similar to remotely sensed images.

What We Do

Within our group we have developed expertise and capabilities to work with satellite multispectral, airborne photos, shipborne sidescan sonar, and DEM digital images. The capabilities include geometric and radiometric calibration and corrections, digital mosaicking, multitemporal change detection, and extraction and mapping of earth science information for various applications.

San Francisco Bay Area Shaded Relief Image, 280 kB
San Francisco Bay Area:Shaded Relief Image generated from DEMs. This type of image is useful for structural mapping. (280 kb)
Examples of some of our remote sensing and digital analyses results include:

 
Members of our group are:
Pat Chavez
Remote Sensing Scientist and Group Leader

(520) 556-7221
pchavez@TerraWeb.wr.usgs.gov
Stuart Sides
Computer Scientist

ssides@TerraWeb.wr.usgs.gov
Miguel Velasco
Image Processor

mvelasco@TerraWeb.wr.usgs.gov
Deborah Lee Soltesz
Web Mistress

webman@TerraWeb.wr.usgs.gov
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