Can you locate the untrafficable soil?
This Landsat Thematic Mapper image covers an area of over 31,000
square kilometers in western New Mexico. As part of a military function
(Intelligence Preparation of the Battlefield) it was desired to
locate occurrences of a particular soil type which could impede
off-road trafficability by heavy vehicles in wet conditions. Can
you delineate these areas?
Subpixel Classifier did!
Includes material © Space Imaging L.P.
Identify areas that may be untrafficable by heavy vehicles under
A signature developed with IMAGINE
Subpixel Classifier was used to search this Landsat image for
occurrences of a particular soil type that would not be stable during
· A large geographic area needed to be covered
and access was very limited
· Complete soil map coverage was not available
· Field soil sampling techniques are extremely
time consuming and expensive
· Underlying soil is often obscured by vegetation
or man-made materials
· Soil type differences can be very subtle
Subpixel Classifier was used to map occurrences of a soil type
considered to be indicative of unstable conditions that could impede
trafficability by heavy off-road vehicles. The results obtained
here were compared to coarse resolution geologic maps (the only
relevant maps available), and a high degree of agreement was found.
A few areas were spot checked with ground survey with similar results.
Soil type information is also useful to farmers and land developers.
The quantitative pixel fraction information provided by IMAGINE
Subpixel Classifier indicates the amount of each pixel where
a soil type exists. Subpixel analysis can be used to distinguish
a particular soil type even when it is covered by or mixed with
a variety of other materials. The presence of the soil type is useful
in mapping the extent of a particular soil profile.