National Land Surveying and Mapping Center. Republic of China(Taiwan)National Land Surveying and Mapping Center. Republic of China(Taiwan)

The original cadastral maps of Taiwan Area were blown during World War II, the cadastral maps presently used by Land Offices are mainly copies drawn according to the originals during the Japans Occupation period, which have been used for over 90 years, the paper has shrunk, damaged due to aging, many areas can hardly be used any more, moreover, in recently 20 years, economy has developed rapidly, with the development of urban construction and frequent division of lot, lot segmentation has been more and more detailed, which has resulted in changes of natural landforms, manual changes of addresses has made the situation of lots utilization different from the records of the cadastral maps; Besides, the technologies and instruments at the time of surveying of the original map were limited, therefore, errors could not be avoided, moreover, the scale of the map was too small and the precision was insufficient, each time of survey would lead to different results, the situation cannot meet the requirements of high-precision cadastral surveying, therefore, in order to create new results of cadastral surveying so as to practically adjust the cadastre, ensure the people’s legal properties and assort with various requirements in future economic construction, the government would carry out resurvey of cadastral maps and calculate the acreages of the lots with latest surveying instruments, high technologies methods so as to make the location, shape, lot number, acreage etc. of land blocks in accordance with the contents in the cadastral maps and registration books.

In narrow sense: Surveying the coordinates of the border points of each lot with surveying instruments and methods so as to calculate the acreages and plot the cadastral maps. In broad sense: Inputting data of cadastral surveying and results of control points, urban planning monuments and border points etc, into computer and establish various basic files so as to complete plotting, acreage calculation, report forms and other automatic operations and improve the precision of surveying.

1.People’s requirements for the precision of surveying increases day by day, the precision of analogue mapping can hardly meet the demand of high land price. 2.The development and popularization of computer allows numeric cadastral files to be combined with documents and processed together, which not only improves the efficiency of administration, but also strengthens the function of services for the people. 3.In order to promote reasonable and efficient management and utilization of land, we must improve the precision of cadastral surveying and completing land administration files so as to establish the multi-objective land information system, and numeric cadastral data can be the basis.

The government has, in order to strengthen services for the people, improve the precision of surveying and establish the multi-objective land information system, specially adopted GPS instruments and total stations and other hi-tech precise measurement instruments and computers etc. For the pilot cadastral resurvey in the numeric method in Yuanlin Township of Changhua County since 1980s, the results of the pilot have show that the surveying was correct as the boundary points were easily restored and the distance measurement was correct as the cadastral maps can be drawn in any scale according to the actual requirements, the resurvey has got fine effect and gained recognition from the people, therefore, it is promoted year after year and since 1989, numeric method is adopted for all cadastral resurvey tasks.

The resurvey of cadastral maps should be carried out according to the Land Act and Regulations for Cadastral Survey, the landowners should, within the period as notified by the land administration authority, establish their respective boundary marks and come to the site for definition of the boundary. The surveying personnel should measure the location and shape of each land block and calculate the acreage with surveying instruments and technologies according to the boundary designated by the landowner, and then publish the results of resurvey, make the registration of landmark alteration and plot the cadastral maps according to the results of calculation. The procedure of the cadastral resurvey is as follows: 1. Defining the area of resurvey. 2. Cadastral investigation. 3. Field survey. 4. Inspection of results. 5. Correction of registration data changes. 6. Bulletin map plotting. 7. Notice of the bulletin. 8. Treatment of objections. 9. Registration of the change in land descriptions. 10. Plotting cadastral maps.

Article 46-1 of the Land Act stipulated that: “A repeat of a cadastral survey may be carried out if cadastral maps of a registration district, where cadastral survey has been carried out, are either damaged, entirely destroyed or lost, or the scale of maps has changed, or for other important causes.”. Therefore, the resurvey of cadastral maps should follow the stipulations in the above Article and Article 46-2&3 of the same law as well as the “Cadastral Survey Regulations” etc.

When applying the copies of cadastral maps in the scale of 1/500, 1/600, 1/1000, 1/1200 or 1/3000 (plotted in the Japanese ruling period), governmental institutions, schools, public organizations or the people should prepare documents or fill the application form to specify the required section, scale, map number and copies and apply at the NLSC (for other cadastral maps in scale of 1/2500, 1/4800 or 1/5000 should be applied for at local county or city governmental institutions), the application fee is NT$50/copy.

The operation of the NLSC regarding numeric cadastral information is as follows: (I) Content of supply: These information are numeric cadastral information stored in uniform format after processing the information of numeric cadastral maps for system management like “Land Revision Surveying System for Numeric Cadastral Survey”, “Computer Operating System for Land Price and Land Use of Land Revision Survey Registration” of the Land Offices of all counties (Cities) in Taiwan Province” and “Management System for the Results of Digitization of Schematic Cadastral Maps” etc.”. (II) Items of supply: Copies of cadastral maps and cadastral map data files. (III) Target of supply: Governmental institutions, academic societies, public organizations and the people. (IV) Mode of supply: filling the application form. (V) Type and standard of charging of information supplied: (1) Numeric cadastral maps: Wood free paper, NT$110/map (A0 size, photogrammetric mapping scale), NT$160/map (A0 size, special scale); NT$70/map (A1 size, special scale) , NT$120/map (A1 size, special scale); NT$30/map (A3 size, photogrammetric mapping scale), NT$80/map (A3 size, special scale) (2) Numeric cadastral data files: DXF, SHP, MIF and DGN etc.. section of unit, section containing less than 500 parcels should be counted as 500 parcels.

The operation of the NLSC regarding information for the results of fundamental control points is as follows: (I) Content of supply: the surveying results of the NLSC, including records of coordinates of 3rd order and 4th order control points. (II) Target of supply: according to the results. (1) Results of reference frame TWD67: Governmental institutions, academic societies, public organizations (2) Results of reference frame TWD97: Governmental institutions, academic societies, public organizations and the people (III) Modes of application: shown below according to the results. (1) Results of reference frame TWD67: filling the application form and preparing the documents. (2) Results of reference frame TWD97: Filling the application form (IV) Standard of charging: Fre. (V) Type of information supplied: Information for results of the control points (MS Word format) To apply for data of the results of 1st and 2nd order control points, please consult Ministry of the Interior.

(1)The application form can be sent by mail, fax or carried in person to the cadastral database of the NLSC (No. 51, Lane 80, Bo’ai Street, Nantun District, Taichung City, Tel:(04)22522966*260; Fax: (04)22514536), and the blueprints can be issued after the application fee is paid. (2)The applicant may collect the cadastral map copies in person at the Cadastral Map Storage of the NLSC or entrust the NLSC for sending (100 copies should be the limit), the expenses should be paid by the applicant.

(I) Content of supply: These information are acquired through checking for the cadastral information of land sections by local Land Office invited by the NLSC regularly, and the numeric section graphs and features databases are also established so as to show the rough shape and relative location of each section as well as related features. (II) Items of supply: Section sketch maps, graphic magnetic files for periphery of the section and magnetic files for features of the section. (III) Target of supply: Governmental institutions, academic societies, public organizations and the people. (IV) Mode of supply: filling the application form. (V) Type and standard of charging of information supplied: (1) Section sketch map: Wood free paper, NT$300/copy (A0 size); NT$60/map (A3size) (2) Graphic data files for periphery of the section: DXF format, NT$1000/file (3) Data files for attribute information of the section: ASCII format, NT$500/file