地籍圖重測與重測後發生震災因應之探討

The Management of Cadastral Resurveying and Cadastral Revistion Surveying after Earthquake

地籍圖與現況必須一致，造成地籍圖與現況不一致的原因可概分為二類，一為地籍圖改變，如已辦地籍圖測量之地區，因地籍原圖破損、滅失、比例尺變更，另一為現況改變如地震造成大範圍地區地表壓縮，變形則有重新實施地籍測量之必要。臺中市大坑地區於1999年四月完成地籍圖重測（Cadastral Resurveying），復於九月遭逢芮氏地震規模七點三地震九二一大地震，災區土地圖根點（Supplementarycontrol point）經檢測結果顯示絕對位移高達七公尺，東西向壓縮約四公尺、南北向伸長約三十公分，造成地籍圖經界線與實地現況嚴重不符。本文重點主要在於介紹地籍圖重測流程及實務與探討臺中市九二一震災地籍圖修正測量（Cadastral Revision Surveying）面臨問題，及如何運用地理資訊資料於災區地籍圖修正測量作業上及其所扮演的角色。並作為後人辦理震災相關測量之參考。本研究成果顯示，土地坵塊相對位置位移於地籍測量相關法規公差範圍內者，則視為未變動的特性，依此劃分災區之土地可分為未變動之土地、斷層帶上經過之土地、及斷層帶週邊之土地等三種土地，可將災後土地之複雜性簡化，且可配合坐標轉換方式，進行地籍整理。 Cadastral maps should be in accordance with current situations, if cadastral maps of aregistration district, where cadastral survey has been carried out, are damaged, entirely destroyed orlost, or the scale of maps has changed, or for other important causes.such as earthquake causedcurrent situations changed, A repeat of a cadastral survey(cadastral resurveying) may be carried out.The central area of Taiwan happened an earthquake at a Richter level of seven at 1: 47 A.M. on September 21 of 1999. It caused the land to deform and displace seriously. The Da-keng area, at theeast of Taichung City completed cadastral resurvey in April of 1999, and the land of the disaster areasuffered about seven meters maximum of absolute movement. The east-west direction compressesabout four meters, and the south-north direction elongates 30cm approximately. It causes the cadastralboundary not to be in accordance with current situations.The purpose of this paper is to introduce the procedures of cadastral resurvey and realistic data, and to discuss the 921-earthquake cadastral revision survey and the problems to be faced.and it ishoped a kind of method for correction of cadastral map that can be used to carried out the CadastralRevision Surveying after earthquakes as a standard of procedure (SOP).The study shows that by analyzing the area of land parcels after earthquake the land parcels canbe categorized three types, (1) non-deformation (2) deformation but within a tolerance, (3)deformation. The second type can be simply solved by coordinate transformation, and the third typeis solved by the specifications of the after-earthquake re-establishment laws.

Cadastral maps should be in accordance with current situations,if cadastral maps of aregistration district,where cadastral survey has been carried out,are damaged, entirely destroyed orlost, or the scale of maps has changed, or for other important causes.such as earthquake causedcurrent situations changed, A repeat of a cadastral survey(cadastral resurveying) may be carried out.The central area of Taiwan happened an earthquake at a Richter level of seven at 1：47 _._. onSeptember 21 of 1999. It caused the land to deform and displace seriously. The Da-keng area, at theeast of Taichung City completed cadastral resurvey in April of 1999, and the land of the disaster areasuffered about seven meters maximum of absolute movement. The east-west direction compressesabout four meters,and the south-north direction elongates 30cm approximately. It causes the cadastralboundary not to be in accordance with current situations.The purpose of this paper is to introduce the procedures of cadastral resurvey and realistic data,and to discuss the 921-earthquake cadastral revision survey and the problems to be faced.and it ishoped a kind of method for correction of cadastral map that can be used to carried out the CadastralRevision Surveying after earthquakes as a standard of procedure (SOP).The study shows that by analyzing the area of land parcels after earthquake the land parcels canbe categorized three types, (1) non-deformation (2) deformation but within a tolerance, (3)deformation. The second type can be simply solved by coordinate transformation, and the third typeis solved by the specifications of the after-earthquake re-establishment laws.