空間多圖籍套疊作業之研究

A Study of Spatial Overlay for Multiple Maps

「國家地理資訊系統（NGIS）建置及推動十年計畫」，為行政院現階段正積極推動之重要工作之一。空間圖籍為國土資訊系統基本資料庫，尤以地籍圖、地形圖及都市計畫圖為該資料庫之核心資料，其成果之套疊及整合應用，為目前重要課題。惟因該等空間圖籍之測製方法、程序及精度標準不同，致該三種圖籍無法精確套合，影響國土資訊系統加值應用與發展。本研究藉由建立三圖套疊模式與二圖套疊比較，並分別以不同圖籍為底圖測試結果，實施兩圖套疊時，四參數成果精度較佳者，約占85.7%；而實施三圖套疊時，則以六參數成果較佳（100%）。實施三圖套疊結果，不等權方式之套疊成果精度與垂距差，優於等權方式。以不同圖籍為底圖進行三圖套疊計算結果，其成果亦不同；而不論以何種圖為底圖，地籍圖之計算精度均為最高。另以地籍圖為底圖時，其垂距差值在公差內之比率亦較高。本研究成果對於推動NGIS計畫空間圖籍套疊作業具重要參考價值。 The National Geographic Information System (NGIS) 10-year Promotive and InnovativeAchievement is one of the most important programs promoted by Executive Yuan. Spatialrelative maps including cadastral maps, topographic maps and urban planning maps are all coredata as a fundamental database within NGIS. Integrative application is now the most importantissue and multiple maps overlap also. Different maps might not overlap precisely because of theirdifferent production procedures and precisions.This study builds up mathematics model of triple maps coordinate transformation usingun-unique weighted constrains and find out four parameters transformation applying to 2 kindsof maps get higher precision result. Applying to triple maps overlay, six parameterstransformation is a better choice. Applying to triple maps overlay, un-unique weighted methodis better than unique weighted method. Different base map was chosen, different result was gotten. Choosing cadastral maps as base map always get better result. To enhance the benefit ofthe project, this research is raised, in addition to improving the precise of multiple maps overlayprocess.

The National Geographic Information System (NGIS) 10-year Promotive and InnovativeAchievement is one of the most important programs promoted by Executive Yuan. Spatialrelative maps including cadastral maps, topographic maps and urban planning maps are all coredata as a fundamental database within NGIS. Integrative application is now the most importantissue and multiple maps overlap also. Different maps might not overlap precisely because of theirdifferent production procedures and precisions.This study builds up mathematics model of triple maps coordinate transformation usingun-unique weighted constrains and find out four parameters transformation applying to 2 kindsof maps get higher precision result. Applying to triple maps overlay, six parameterstransformation is a better choice. Applying to triple maps overlay, un-unique weighted methodis better than unique weighted method. Different base map was chosen, different result was gotten. Choosing cadastral maps as base map always get better result. To enhance the benefit ofthe project, this research is raised, in addition to improving the precise of multiple maps overlayprocess.