Approaches to establish Land
Resource Information on a large scale by gathering advantages of every
level government Chen Min Zhi Land Administrative Bureau of Taizhou Prefecture Zhejian Province, P.R of China Abstract Land Resource Information System (LRIS) which contains informations of both topograph and attribute, is an important component of Geography Information System (LIS), as well as a basis for scientific policy decision of governments. However, at the primary stage, to set up this system needs hard works to collect and process the original informations by complicated working methods, requiring high technology and large amount of money and jointed efforts of related governments and departments. All this makes it difficult to establish the system on a large scale shortly for governments at a country level, but feasible at a prefecture level which could collect the advantages in technology and money of the higher and lower level to solve a series of difficulties in the establishment of LRIS. TAOZHOU Prefectural Land Administrative Bureau, ZHEJIAN province, P.R. of China, takes the chance of land detailed investigation launched by the state council to concentrate the advantages in technology and fund of the higher and lower level governments on establishment of computer data processing centre at a prefectural level to process the original informations investigated outdoors by the country government departments, setting up LRIS on a large scale through adopting “Data-processing System For Land Detailed Investigation”. The centre built in May 1990, to date occupied twelve pieces of microcomputers, eight pieces of digitizers, two pieces of printers, two pieces of plotters and twenty three technical operators and goes forward at a data processing speed of 20-30 kilometer squares per day, having fulfilled the data-processing task over three million kilometer squares and gained 2500 pieces of disks and six kinds of mina databases which jointed AUTOCAD into a primary information management system with functions of data-output, edit, transformation, display, index and multifruit output, which has become the centre of data –processing, accumulation and spread in technology on a certain scope. The thesis would offer the main approaches, methods and experiences of LRIS establishment in TAIZHOU prefecture. 1. The Current State, Development And Approaches In the Establishment Of Land Resource Information Databases On A Large Scale in TAIZHOU Prefecture. TAIZHOU prefecture, located along the southeast coast of ZHEJIAN province, P.R. Of China, between 28°17’ and 121°56’ east longitude, with a total area do 9793 kilometer squares and eight countries, in which there are not only mountains, rivers, plains, but also seafield, islands, the hightest altitude being upto 1382 meter and the land utilization being very dense that the average used density would be upto about 60 blocks per kilometer square. The establishment of Land Resource Information Databases in the prefecture began in 1989, had been undergoing in combination with the Land detailed investigation launched b- y the state council, to date have finished over three million kilometer squared and will have finished the whole scope by the end of 1993. The work is a systematic engineering which is a combination of many links, involving a wide scope and every level of land-owners, land – users, governments and departments requiring not only high technology and large amount of money, but also efficient organization and management measures, which developed by two stages in our prefecture as follows. Stage 1 : External Works – Investigation of Outdoor Informations The investigation and drawing outdoors is that outdoor informations in the utilization and right of land are investigated and drawn on aerial photographs in special colour and type lines, in which the utilization of land is divided into eighty four kinds which the smallest investigated and drawn unit is 400 meter square in cultivated land area and two meter in width of string shaped objects, such as roads, subways, irrigation canals and ditches etc, the informations in land-right include divided lines of every level of administrative divisions from village to province, and land-own, land-using units. Therefore, the work is a general resource survey of the most detailed and the precisest since the foundation of P.R. of China, the fruits of which are the richest formation sources for LRIS. Because of involvement of wide scope and lots of works, in order to ensure running smoothly and high precise, accuracy of the fruits, there toke a series of measures as follows in the prefecture.
The initial informations gained outdoors could be processed by either traditional methods or computer, which both requiring a large amount of money. However, the fruits ach- ieved by computer could be directly formed in to Land Resource Information System which largely promote the applying efficiency of the fruits. Owing to lack go money and technique at all level government alone, we adopted a new computer- applying pattern, that is computer data processing centre at a prefectural level which could collect the needed money and technique from the higher and lower level governments and institutes. In order to tackle difficulties in the application of a new technology, the centre developed by two steps : Step 1 : Test and Accumulation Of Experience The software applied to the internal works is “Data Processing System For Land Detailed Investigation” which contains five subsystems: 1) Collect and edit of initial informations on the investigated aerial photographs to form digitized chain-point databases and accordingly attribute databases. 2) Collect and edit of photograph feature points to establish digital altitude models of topograph 3) rectification of the chain-point coordinates of initial infromations and combination of informations on neighbouring aerial photographs. 4) Calculation and summing up and output of area. 5) drawing of the fruit map. Being a first fruit of scientific research the system is lack of strong adaptability and practicability and required improvement in the application especially on a large scale. At the primary, because of lack of being recognized in its efficiency and mastered in its technique, it is necessary to test on a small scale to accumulate experience in technique and management in its large scale application. In 1990, money from two counties were collected to build” Associated Microcomputer serving Centre Of TAIZHOU Prefecture” and technological forces were concentrated on experiment, while fulfilling the data-processing task of HUANGYUN country over 1200 kilometer squares, having solved a series of difficulties and planed out the measures and rules which could ensure smoothly and efficiently run of the system in the application to reality, the details are follows :
In order to further promote the speed of data-processing at the centre, in 1991, money from the rest counties were collected to expand the centre scale, to date the centre occupied twelve pieces of microcomputers, eight pieces of digitizes two pieces of plotters, printers and twenty-three operating technicians and implemented large-scale productive line, realizing the specialized and cooperation of labour to promote the efficiency. The speed of data – processing is up to 20-30 kilometer squares per day. It is estimated that the task of data processing and database – building of total 9793 kilometer squares in the prefecture will have finished by the end of 1993 2: The feasibility and effective channels to establish land resource information on Databases On A Large Scale – Computer Data processing Centre At A Prefectural Level. At the primary stage, to set up this database needs hard work to collect and process the original informations by complicate working methods, requiring high technology and large amount of money. Besides, the scope involved is wide and it is slow to be effective. At this will make it very difficult to be understood and supported. In order to extend work on a wide scope, there must be equipped with four essential conditions as follows: 1) Owing strong economic strength and support from leads of every level. 2) Owing fairly perfect software and hardware if steady property. 3) Owing key members of technicians who are of certain organizationability and responsibility. Familiar with the principle and means of this software systems. 4) Owing actual productive efficiency and effects. Nowdays, the county’s department of land administration has heavy tasks and limited time and their economic, technological conditions are poor. Any of them is not able to fulfill this task of set up the information database by himself. However the county’s economy and technology is scattered unbalancely and the time they being to investigate land resource is different. Through rational organization and concentration of their superiorities, it is not only possible to establish Land Resource Information System while fulfilling the detailed land investigation, but also can generate big benefit. The comparative study tells us that to process the indoor data of the land detailed investigation on large scale with prefectural bureau as centre is the most effective way to set up land Resource Information system at it primary stage, which can solve the above mentioned difficulties and bears lots of advantages:
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