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Import cross section survey data to help build a river reach.
Tutorial resources
These downloadable resources will be used to complete this tutorial:
River modelers generally build their river networks from survey data. The first stage in building a river reach is to import the necessary survey data, such as cross section lines, section data, and the river reach center line. As with other imports in InfoWorks ICM, this is done using the Open Data Import Centre (ODIC). This exercise imports pre-prepared survey cross section data, river reach centre line data, and node locations.
Now start importing several sets of data into this model. First are the cross-section surveys:
Much of the data associated with rivers and structures is held in subtables. Therefore, it is necessary to first create the objects before populating the subtables with data:
Notice that new Import Fields are now set to be imported.
A river junction or inflow point is always a break node. This has no definable area but allows connectivity between the link objects. In this example, the node locations have been pre-defined. To import break node data:
Next, import the river reach center lines:
Survey data is displayed on the GeoPlan as a series of lines. The blue lines represent cross-section data.
Where additional data is required, this can be added manually within the ICM interface.
Commonly, the cross section X, Y, Z data will have been provided by a surveyor, although it may need reformatting. The node and river centre lines could either be derived outside of ICM and imported, as per this example, or, manually created within ICM from mapping, once the cross sections are imported. When adding a node to be placed on top of a cross section line, it is important to make sure that it is snapped to one of the points on the cross section.