國有財產局自2004年起利用當前測繪科技之三大主流技術，包括遙感探測（RS）、全球衛星定位系統（GPS）及地理資訊系統（GIS），協助辦理國有土地勘清查作業。RS可以提供高解析度的正射影像，供作參考底圖及空間位置辨識之用；GPS快速提供高精度定位成果；GIS作為開發各種輔助勘清查內外業之資料處理系統之平台，使勘測人員能輕鬆駕馭國有財產局的各項勘清查必須之資料。為此，3S技術改善了勘清查作業程序，提高作業流程的自動化，大量節省人力及作業時間，相當程度地提昇業務效率。
　本研究選定五個不同使用地類別之測區作為分析，由案例分析結果得知，對不同特性之測區，3S技術均能發揮一定程度的助益，例如地籍圖套疊至正射影像後，便可直接先在內業進行初步的勘清查工作，事先對勘查地區有全面的了解。同時也統計分析國有財產局台灣南區辦事處自2001至2005年期間辦理的案件數量、結案天數和辦結率，結果發現2004年引用3S技術之後的結案天數有相當程度的縮短，同時結案率也明顯提升。此表示勘清查作業由傳統必須完全由人工處理眾多資料且需親赴實地勘測的方式，已逐漸轉型成可由電腦自動化處理內業資料和精確快速外業勘測的工作型態。
　本研究也針對差分定位（DGPS）和虛擬基準站即時動態定位（VBS-RTK）二種外業測量方式與傳統全測站經緯儀的測量結果進行比較分析，結果發現DGPS成果與全測站經緯儀結果差異量約為1公尺，此精度已可滿足山區土地之勘測作業需求；另VBS-RTK成果與全測站經緯儀測量結果之差異量在數公分，已能滿足各種測區之需求，且此二種測法均具有快速、設備便於攜帶之優點，是傳統測法及設備所無法比擬的。

　Since 2004, National Property Bureau (NPB) takes use of three popular technologies on national lands survey implement, including Remote Sensing (RS), Global Position System (GPS) and Geographic Information System (GIS). RS provides the ortho-images in high resolution for identifying space location and being the base map; then GPS pinpoints the location precisely; and GIS is taken as the plate for developing every kind of processing systems which assist office/field survey implement and make surveyor easily utilize all data of national land. As a result, 3S technology improves the implement flow, enhances the automation, saves a mount of labor power and processing hours then raise the efficiency of surveying affair.
　This research chooses 5 regions of different type landuses as experiment areas. From case analysis we got a result that 3S technology do bring advantage on every type of regions. For example, we can prepare the surveying job in office by overlay the cadastral on ortho-image then we can get a whole picture about the goal region. In the same time South office of NPB can calculate the case number, finishing days per case and the percent of case termination from 2001 to 2005. We found that taking use of 3S technology can actually shorten the finishing days per case and raise the percent of case termination. It means the traditional survey implement is transferring gradually to the modern electronic automation process—from dense labor job to efficient precise work.
　This research also compares the survey precision of DGPS, VBS-RTK and traditional transit. The result shows the precision of DGPS is only worse than transit for 1meter that can be useful in mountain area. On the other hand, the precision of VBS-RTK is just about the precision of transit for few centimeters which can satisfied all kinds of area. Furthermore DGPS and VBS-RTK is more instant and convenient that traditional survey cannot achieve.

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