Study On The Data Quality Evaluation And Control Methods Of Land Change Survey

The second national land survey to establish the national, provincial, city (prefecture) and countylevels to become the core foundation of the database data daily management of land and resources anddecision-making, in order to ensure that the current situation of these four databases, the Ministry decidedin2010changes carried out National Land Survey and gradually turn, aims to be able to accurately graspthe real-time status of the annual land use, ownership, scope changes, and thus already established fourland survey data to update the database. Specific processes of land change survey is2009National LandSurvey database record acceptance as the basis for the county as a unit within the annual land use status,ownership changes, and various types of land management information, conduct surveys, monitoring,verification, summary, and other statistical and analytical activities. By plaque outside the industry changemap information collected during the year in land use, has been established for the second land surveydatabase polygons change, property storage and extract incremental annual land change survey database,statistical changes in the various categories on the ground statistical summary tables, and step by steptogether to form various levels of land the city (prefecture), provincial, national survey results and otherdata changes. After the end of the year survey to determine changes, and then update the underlyingdatabase data replaces the spatial extent of the data is the same as changing the underlying database surveynext year. It is because of the change of land survey project conducted a special way, and data to its owncharacteristics, how to efficiently complete and accurate data production tasks, access to quality outcomesdata has become the focus of our concern.Firstly, all kinds of factors that affect the general quality evaluation methods and data quality spaceresearch and Analysis of land change survey data production processes, land use change survey datacontent and features, while building suitable land in Shaanxi Province change survey data qualityevaluation model, and then analyze the relevance both the data of land use change survey each stage ofproduction and quality evaluation model quality evaluation, last changed accordingly proposed land surveydata quality control methods, and quality control methods in this article to verify the validity. This article isfrom the perspective of the production units of data for data quality evaluation and quality control ofcontent, research data production process, presentation of data encountered during the production of dataquality problems and solutions, and by the effectiveness of these methods proved and feasibility.