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Profiles were sampled along selected lines. They include distance in meters and basin membership. This is a draft map of most of the profiles, lined up with their vertical position on the map.
The base image is the Hydrosheds version of the SRTM DEM. A longitudinal
profile of the upper Yangtze was created by tracing from cell center to cell
center. That profile was fed into xsections.py
to create cross-sectional profiles. Cross-valley profiles in this example
are spaced at 10 km intervals. The are 70 km long, and are oriented
perpendiclar to a baseline 120 km long.
The criss-crossing of the profiles is a matter for discussion. It could be corrected by shortening the lines, lengthening the baseline, or by constraining the change in angle between successive sections. Section lines could also be hand-edited (and bent, too) in a GIS, though that could be tedious.
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Profiles were sampled along selected lines. They include distance in meters
and basin membership. This is a draft map of most of the profiles, lined up
with their vertical position on the map.
This is based on files on Harvey's desktop computer in e:/work/yangtze.