台灣地區在地理上位於亞洲大陸東南側，正好位於歐亞大陸板塊與菲律賓海洋板塊的銜接處，屬於地質作用頻繁的活動地帶，在氣候上位居於亞熱帶氣候，此外，台灣是一塊海島，受到暖濕氣流和洋流之影響，又屬於海洋性氣候，所以台灣地區有著地震頻繁和多雨的特點，這兩種特點至使台灣地區的地表有著多樣性的變化。

而隨著GPS靜態測量的定位精度以可達到公分級，因此本研究試圖使用GPS來偵測台灣地區的幾天內的地表變化，然而使用原始觀測資料通常無法直接偵測出地表的變化幅度，因此需要加入其他的修正量，比如說對流層修正量和週波未定數等，本研究集中於處理GPS數據時加入適當的修正量，以探討幾天內的地表變化。研究結果顯示，將可偵測出2天內3公分以下的地表變化。

In geography, Taiwan is at the southeast side of Asian continent, which is at the join between Eurasian plate and Philippine oceanic plate, that means there are lots of geological events in Taiwan. In climate, Taiwan belongs to subtropical climate. Also, Taiwan is a sea island, and effected by the warm air and ocean currents, so Taiwan belongs to oceanic climate at the same time. Because of those that mentioned above, there are two features in Taiwan which are frequent earthquakes and lots of rain. The two features give Taiwan’s earth's surface diversity of change.

With the positioning accuracy of static GPS can reach cm level, GPS method has been applied to detect the change of Taiwan’s earth's surface over a few days in this research. But using the raw data along can’t be used to detect that change directly, so it needs to add other corrections, for example, troposphere correction and ambiguity. This research focuses on investigating the earth's surface motion in a few days by processing GPS data with proper corrections. As a result, it is possible to detect the change of earth's surface below three cm in two days.

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