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Poster Session 3
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Updating and application of DTM on Violent Hill-Slope Land Development
1.Aspect
Divide into 9 grades the aspects before and after the development.
Table 6 shown:
| Aspect Grade | Before Development | After Development | Difference% |
| Area(ha) | % | Area(ha) | % |
| N | 2691.20 | 12.81 | 2685.28 | 12.78 | -0.03 |
| NE | 2043.52 | 9.73 | 2046.08 | 9.74 | 0.01 |
| E | 1865.12 | 8.88 | 1855.52 | 8.83 | -0.05 |
| SE | 2436.80 | 11.60 | 2456.96 | 11.70 | 0.10 |
| E | 2856.80 | 13.60 | 2888.48 | 13.75 | 0.15 |
| SW | 2720.64 | 12.95 | 2726.08 | 12.97 | 0.02 |
| W | 2414.24 | 12.92 | 2688.16 | 12.79 | -0.13 |
| NW | 3011.68 | 14.34 | 2989.12 | 14.23 | -0.11 |
| Flat Land | 668.00 | 3.18 | 677.12 | 3.22 | 0.04 |
Table.6 Difference of Aspect Grade Before and After Development
According to the changes of the aspect, after the development there are striking increases in southeast and south aspects and striking decreases in west and northwest once. The rest change less. The result is related to the fairway direction and weather. Because the south and southeast can avoid the wind in Winter and the sun in summer.
Conclusion
1.By overlaying the established DTM before and after the development, we can know the changes of elevation of the developed areas. Furthermore, we can , from the Changes, calculate and monitor the cut-and-fill volume. Overlaying the contour and DTM can also shows the degree in terrain changes.
2. After analyze DTM of developed areas, we can see the result of monitoring : The maximum cut depth reaches 71.9meters, the total depth 32,008.1 meters the total cut volume 51,210,000 cubic meter, the fill height 104.6 meters, the total height 30060.6 meters, the total fill volume 48,090,000 cubic meter, and soil lost 3,120,000 cubic meter.
3. Integrate RS and GIS proves to be a quick and effective method in monitoring the development of giant hill slope. It can result in the real-time, entirely, and accurate in monitoring certain sites. And also with updating the DTM, the combination can cost less in man power and money.
Reference:
- Tzu-How Chu, Steven-Kuo,1995, Automatic Producing DTM, The Symposium of the First Conference of Chinese GIS Association, pp.7-18.
-
Tz-Chung Liu,1994, application of
DTM and Remote Sensing on
Water Resource Engineering,
Training Material of Erdas Inc.
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Chien - Hue Lio, 1995, The
Radiation Correction of mountain
Area of SPOT Satellite Images,
The Symposium of the 14th
Surveying conference, pp.389-400.
- Buo-Wen tasi, king-Tasong chang, 1989,The Effect of DEM Resolution on Spatial Interpolation, Remote Sensing (11):pp.29-40
- Hsin-Hsing Cheng, 1996,study of Monitoring on Giant Hill slope Land Development MasterThesis of National Chung-Hasing University.
- Kung-Chung Lai, Wen -Chang Chen, 1994, The Development of Digital Mapping on Agriculture and Firest, Remote Sensing(21):pp.81-100.
- Chien-Yu Jan Liang-Chien Chen, 1994,DTM Generation from SPOT Stereopair Using the Level-9 Product of SRSL, the Symposium of the 13th Surveying Conference, pp.497~5040
- Chen A.J.and J.Y.Chen, 1991 cusing Loutranb an dDEM to derive surface reflectance factor from SPOT HRV data. d IGARSS '91june 3-6 Espoo,Finland, pp.651-654
- G.Petie, TJM Kennie 1990 ; Terrian Modeling in Surveying and civil engineering ; pp.1~3
- Kumler,M.P. 1992 An intrusive Comparison of TINS and DEMS, Ph.D Dissertation, Development of Geography Univ. Of Califoenia,Santa Barbara, California, pp. 15~18
- lay, J.G.1993 ; Experiments on Errors of Digital Elevation Models ; GIS/LIS proceedings,1 pp 389~397.
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