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ISIS by Halcrow > ISIS Mapper

ISIS Mapper

ISIS Mapper is a visualisation tool for viewing 3D surface data. It has been specifically designed to be compatible with ISIS and TUFLOW model data enabling these to be viewed interactively with other GIS data.

ISIS Mapper provides modellers with a means of producing flood maps and animated flood sequences. It also enables modellers to extract information from GIS to utilise in model building. It is compatible with many commonly used GIS data types and provides both 2D and 3D viewing options to enable the most appropriate level of interaction for your needs.

ISIS mapper river output

2D view of the River Thames, showing the ground surface with an overlying floodwater surface

Banded legending and built-in hill shading assist with visualisation of fine detail in complex datasets such as LiDAR and national SAR ground models.

Images, such as OS maps and aerial photographs can be viewed in 2D or draped over surface grids to create 3D view

ISIS mapper aerial image

3D view of Boscastle with aerial photography draped over the ground surface

ISIS Mapper supports the generation of water surfaces from both ISIS and TUFLOW model results. Assigning 1D model results to an ISIS Mapper native triangular network and interpolating enables points to be mapped onto a 3D surface. Displaying these data in conjunction with other GIS data enables the production of flood maps. These can then be used to show the locations of properties and their interaction with floodwaters as levels vary over time

ISIS Mapper is packaged as part of the ISIS suite of tools (at no extra cost). It is included in both ISIS Professional and ISIS Free. Full ISIS Mapper functionality is retained in ISIS Free, but with restrictions imposed on maximum file sizes that can be loaded into the map viewer. The ISIS Mapper tool is accessed directly from the standard ISIS interface but can also operate independently from ISIS.

ISIS Mapper, developed by Halcrow’s in-house technical software team in response to flood mapping needs on a broad variety of projects. The software is continually being updated to meet the evolving needs of modellers. Future enhancements will include the ability to generate TUFLOW model files and extensions to the flood mapping functionality to enable the removal of isolated small islands and ponds.

ISIS Mapper key features

View GIS data

  • Grids – Binary Interchange grids (FLT), ASCII grids and ESRI grids
  • Vectors - ESRI Shapefiles, CSV point data and ISIS Mapper native triangular network
  • Images - TIFF / GeoTIFF and JPEG

View ISIS and TUFLOW model results

  • ISIS binary results (ZZN)
  • ISIS TabularCSV
  • SMS / TUFLOW scalar data
  • SMS / TUFLOW vector data (velocities)

Export flood maps as

  • Shapefile
  • Grid
  • Google Earth format (KML)

ISIS model building from spatial data

  • Create river cross sections
  • Extend surveyed cross sections onto floodplain
  • Create reservoir units
  • Create spill units

Create animations from ISIS or TUFLOW model data or GIS map layers

Interested in learning more

Contact Vijay Jain or Alastair Sheppard on +44(0)845 094 7990 or at for general information. For support contact us on +44(0)845 094 7994.

Your ISIS feedback

Halcrow is continuously developing ISIS and we would like your feedback to target areas for improvement. Email isis@halcrow.com with your comments.

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