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| Untersuchte Arbeit: Seite: 38, Zeilen: 20-28 |
Quelle: Bell 2004 Seite(n): 20, Zeilen: Table 1.4, left col. 1ff - right col. 1ff |
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| As compared with conventional techniques, by means of GIS, a much larger variety of analysis techniques became attainable. Because of its speed of calculations, complex techniques requiring a large number of map overlays and table calculations became feasible. It also provides the possibility to improve models by evaluating results and adjusting the input variables. Here, user [sic] can achieve the optimum results by a process of trial and error, running the models several times which was difficult to achieve even once in the conventional manner. Therefore, more accurate results can be expected. In the course of a landslide hazard assessment project, the input maps derived from field observations can be progressively updated when new data are collected. Prepared data can be used by many users in an effective manner although the data entry (digitizing) is time consuming work. | Table 1.4 Advantages and disadvamtages of GIS
[left column] Advantages A much larger variety, analysis, techniques are available. Because of the speed of calculation, complex techniques requiring a large number of map overlays and table calculations become feasible. It is possible to improve models by evaluating their results and adjusting the input variables. Users can achieve the optimum results by a process of trial and error, running the models several times, whereas it is difficult to use these models even once in the conventional manner. Therefore, more accurate results can be expected In the course of a hazard assessment project, the input maps derived from field observations can be updated rapidly when new data are collected. Also, after completion of the project, the data can be used by others in an effective manner [right column] Disadvantages A large amount of time is needed for data entry. Digitizing is especially time consuming |
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