Application of Geographic Information System

• Main Authors: Tai-Shian Chiu, 邱泰憲
• Other Authors: Chun-Nan Lin
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/03137256689799786705

碩士 === 國立臺灣大學 === 生物環境系統工程學系暨研究所 === 91 === The purpose of this study based on the differences of the water demand and the irrigation schedule is discussing：(a) current irrigation schedule (b) rotational irrigation schedule─constant planting rate type (c) rotational irrigation schedule─constant discharge during land preparation type (d) continues irrigation schedule─constant planting rate type (e) continues irrigation schedule─constant discharge during land preparation type in the situation of different depth of water requirement. In this study, a Geographic Information System of the water demand and the irrigation schedule is developed by using Visual Basic and ESRI MapObjects. In different models, the system calculates the discharge of every time scale and the irrigation time of every field. This system provides the information of space and time in the process of irrigation. Moreover, the system also provides the function of spatial inquiry, the inquiry of the subpoena, the time schedule of irrigation every field and the chart of the discharge of every time scale. The calculation of water demand in current irrigation schedule is unable to correspond to the water requirement exactly needed theoretically in the field. By using numerical analysis to correct the planting rate of rotational irrigation schedule- constant discharge during land preparation type and continues irrigation schedule- constant discharge during land preparation type, it maintains the discharge constant during land preparation in the situation of different irrigation demand.