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Evaluate erts imagery for mapping and detection of changes of snowcover on land and on glaciers. [cascade range, washington and tweedsmuir glacier, alaska
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Copyright Year | 1974 |
| Description | The author has identified the following significant results. The area of snowcover on 10 individual drainage basins in the North Cascades, Washington, has been determined by use of a semi-automatic radiance threshold technique. The result is a unique record of the changing water storage as snow in these important hydrologic units, the runoff of which is utilized for hydroelectric power, dilution of wastes and heat, support of salmon migration, and irrigation. These data allow a new type of hydrologic modelling to proceed which should permit more accurate forecasts of streamflow. A new technique has been developed for measuring snow-covered area or snowline altitude semi-automatically. This variable contour overlay method permits the snowcover to be matched efficiently to the best fit contour of altitude. The motion of the Yentna Glacier during the concluding phase of its surge was successfully measured by a flicker technique using images of two dates. It appears that displacements as small as 100 to 200 m can be measured. Motion of the Tweedsmuir Glacier in Alaska was measured using ERTS-1 images enlarged to 1:50,000. Changes detected included a shock wave moving down the glacier, the margin expanding, the moraine pattern deforming, and the marginal valley deepening. |
| File Size | 133687 |
| Page Count | 4 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19740013881 |
| Archival Resource Key | ark:/13960/t0ns5hw5s |
| Language | English |
| Publisher Date | 1974-02-28 |
| Access Restriction | Open |
| Subject Keyword | Geophysics Glaciology Hydrology Earth Resources Program Measuring Instruments Cascade Range Ca-or-wa Alaska Snow Cover Land Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
