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The life cycle of the land starts from the first registration of the land. In addition to the basic information, it is also accompanied by the publication of the ownership or other rights. These information will also change with the progress of time. In addition to the attribute data of ownership, the spatial extent of land is also an important matter.
The cadastral maps published on the land are related to the property and rights of the people. How to allow people and business management units to grasp the cadastral appearance and ownership of a specific time and specific space at any time and conveniently without affecting the normal operation of the existing land administration system is the focus of this research.
The cadastral database only saves the current registration data, and the relevant transaction data can only be traced through other registration items and transaction index files. Other registration items only record the transaction track, and the text analysis and semantic analysis of the text content must be published in the transaction index file to perform data correlation and combination, and it is not the content that can be directly queried and judged. Land buying and selling, inheritance, division, merging and setting, cadastral registration and land graphics are changing at any time, and anyone who walks must leave traces.
When the administrative punishment is relative to the land number, a certain level of meaning is aimed at the spatial scope represented by the current land number. The space range represented by the land number at a specific point in time cannot be lost due to the division and merger of land.
The data table is designed with two fields, "Begin Life Stamp" and "End Life Stamp", which are used for time series comparison. For a data row with an end life stamp, the begin life stamp field must have a value. The value of the end life stamp must be greater than or equal to the value of the begin life stamp. Each data row must have a valid timestamp, but not necessarily an end life stamp.
When data is added, the registration date is used as the begin life stamp of the new data. When data is changed, the day before the registration date is used as the end life stamp for the loss of the data, rather than the actual modification or deletion; at this time, a new piece of data is added with the post-change information and the registration date is used as the begin life stamp.
For the space part, in line with the current land administration surveying and posting principles, the coordinate values are based on the TWD97 / TM2 zone 121 (EPSG: 3826) as the posting and recording standard.
Based on the concept of the spatiotemporal mixed data model, a snapshot of a cadastral database is used as the basis for the source of map data conversion. In this snapshot database, first check other registration items to clarify the change history of each subject matter. Then compare the change index to find out the time point of each change history.
Considering that data can be provided without a second query, the data conversion design will directly convert and write the code content instead of writing the code value. At this time, description information such as boundary points, meridian lines, parcel relationships, and lot attributes in the survey data table will also be converted and combined into a spatial data type (geometry) and written into the spatial data table.
After the initial version of the base data is available, the monitoring and comparison of the index data for changes will begin. When there is a change date after the date of conversion of the first edition, the judgment of the date of registration and the reason for registration shall be made. When it matches the concerned change data, trigger the change data acquisition, and convert related data and graphics.
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