Dynamic Segmentation of Linear Features Using Linear Reference (Especially for GATE-Geospatial 2022)

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Linear reference is a method for dynamic segmentation, which stores the geographic position by measuring the relative position of linear features, which is locating the event along the line by distance.

Figure Shows Linear Reference

In figure, above is a simple linear reference. There is a line that has measuring values (e. g. road, pipeline) . The points and segments are the line is events (e. g. traffic accident, road materials) .

In GIS, the line object is abstracted as a series of 2-dimensional points represented by x, y coordinates. It is helpful to locate one position accurately, and performs well in the area calculation and distance computation.

Example of Dynamic Segmentation Using Linear Reference

Dynamic segmentation uses linear reference. It uses two data structures: route dataset and event table dataset. In real life, many geographic positions are recorded as the events of features along the line. For example, we tell you that an accident happened in 500m west to the No. 32 corner. Over-accurate figures are useless for us in our daily life.

Figure Shows the Result of Dynamic Segmentation

After created vector point and line route data, create thematic map with one of the attributes. Above figure displays the result of a thematic overlap with the original route. The mauve pale line is the original data.

Dynamic segmentation is a based on the traditional GIS data model, use linear reference and the location of the attribute data to realize the dynamic display analysis and output of attribute data.

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