Importing ISIS Network Data

River section and spill data can be imported from ISIS .dat files to InfoWorks ICM river line objects. Where a continuous run of sections exists, the importer will create a River Reach centre line running through the sections. River reach section geometry can then be built using the imported section and spill data.

Note

The importer assumes that the .dat file contains geo-referencing data (easting and northing fields). The import of geometry data from .ixy files is not currently supported. Non geo-referenced data will be imported, however sections will not be imported to the correct geographical position.

To import network data from an ISIS .dat file:

  1. Open the network to be updated
  2. Select Import | Model | from ISIS network data... from the Network menu. This displays a standard Windows File Open dialog.
  3. Select the .dat file to be imported and click Open.

For details of the objects imported and conversions made by the importer, see the Conversion Notes below.

Conversion Notes

The objects currently supported by the ISIS importer are River sections and Spills. This section discusses the conversion of data from the ISIS .dat file to InfoWorks ICM river line data.

River Sections

River sections are imported as cross section lines. River section data from the ISIS .dat file is imported into the Section data grid of the cross section line.

Note that for sections that are not geo-referenced (easting and northing values not defined, or all set to zero), the sections are imported at the origin (0,0) and ISIS xi (chainage) is imported into the X coordinate field of the ICM points grid.

ISIS River Section Data Field InfoWorks ICM Conversion Notes
Label1 (node name) Cross section line ID
dx (distance to next cross section) Not used
n1 (number of data lines) n1 number of points imported into section data editor grid
xi (Cross chainage) Not used - offset is calculated from X coordinate and Y coordinate
yi (bed elevation) Bed level
ni (Manning's n roughness coefficient)

Roughness Manning's n

* (denotes first data pair in a panel)

New panel set to true
ri (rpl) Not used
LRB (denotes left bank top, right bank top and thalweg)

Used to determine position of river reach centre line.

Where a continuous run of sections exists, a River Reach centre line will be created. The position of the river reach centre line is determined as follows:

  • centre line will run through points on section marked as 'BED' where LRB is set in ISIS file
  • if no bed level exists, the lowest elevation in the section is used
  • if there are multiple points at the lowest elevation, the middle point of the section is used
easting

X coordinate

northing Y coordinate
deactivate_marker Not used

Spills

Spills are imported as bank lines. Spill data from the ISIS .dat file is imported into the Bank data grid of the bank line.

Note that for sections that are not geo-referenced (easting and northing values not defined, or all set to zero), the sections are imported at the origin (0,0) and ISIS xi (chainage) is imported into the X coordinate field of the ICM points grid.

ISIS Spill Data Field InfoWorks ICM Conversion Notes
Label1 (first spill label) Bank line ID
Cd (weir coefficient)

Discharge coeff - cd
m (modular limit)

Modular limit
n (number of data lines) n number of points imported into section data editor grid
xi (chainage along weir crest) Not used - offset is calculated from X coordinate and Y coordinate
yi (elevation of weir crest)

Bank level

easting X coordinate
northing Y coordinate

Importing Network Data

River Reaches