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| Earth Resources Observation and Science (EROS) |
The Compound Topographic Index (CTI), commonly referred to
as the Wetness Index, is a function of the upstream
contributing area and the slope of the landscape. The CTI
is calculated using the flow accumulation (FA) layer along
with the slope as:
CTI = ln ( FA / tan (slope) )
In areas of no slope, a CTI value is obtained by
substituting a slope of 0.001. This value is smaller than
the smallest slope obtainable from a 1000 m data set with a
1 m vertical resolution.
Download
HYDRO1k CTI data set for Asia as a tar file (53.4
MB)
Download entire HYDRO1k
data set for Asia as a tar file (277.2 MB)
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For further assistance, please contact: Customer Services U.S. Geological Survey Center for Earth Resources Observation and Science (EROS) 47914 252nd Street Sioux Falls, SD 57198-0001 Tel: 800-252-4547 Tel: 605-594-6151 Fax: 605-594-6589 Email: custserv@usgs.gov Business Hours: Monday thru Friday, 8:00 a.m. to 4:00 p.m., central time |
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