Set Zpt
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Sets all Zpts over the whole 2D domain to the same value. Useful for providing an initial elevation prior to other commands as some Zpts in inactive (land) parts of the model may not receive a value. The default value for all Zpts is 99999.0.
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Read MID Zpts
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Normally used to set the Zpts generated from a DTM. Use the Write MI Zpts command for TUFLOW to create a GIS layer of Zpts with no elevations (TUFLOW only writes out Zpts at active (non-land) cells). This layer is then imported to a GIS, each Zpt assigned an elevation from a DTM and then exported for use by the Read MID Zpts command. Note the use of MID in the command.
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Read MI Zpts
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This command is significantly different to the Read MID Zpts command above. It is typically used for modifying parts of the topography. Examples are filling an area (defined by a region or polygon object) to the same elevation, and dredging a section of river (defined by a region or polygon object) using Read MI Zpts ADD.
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Read MI Z Line
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Reads 3D breaklines (defined as a polyline with elevation points) to modify the nearest Zpts to the height of the line. A very powerful command for ensuring the crest height of ridges (levees, embankments, etc) is correctly modelled. A number of options exist for this command. Also see Allow Dangling Z Lines and Pause When Polyline Does Not Find Zpt.
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Default Land Z
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Now rarely used in lieu of Set Zpt.
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Interpolate
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Allows the interpolation of Zpts from other types of Zpts. Now rarely used as nearly all models assign values directly to all the Zpts. The original TUFLOW code only required input of ZH points, and the Interpolate command provided a tool for interpolating the other Zpts.
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ZC == MIN(ZU,ZV)
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Rarely used.
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