QGIS Extract CrossSections

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    Extract Cross-Sections/Elevations from DEM to TUFLOW format .csv file.

    Thanks to user Ben Throssell for submitting the following, much appreciated.
    To use QGIS to extract cross sections from your DEM the following method can be used.

  1. Draw your cross sections using the TUFLOW 1d_xs file, be sure to fill in the source column.
  2. Install the QGIS plug-in "profile from line" (note you may also need to install shapely - see http://osgeo-org.1560.n6.nabble.com/plugin-profile-from-line-td4133320.html).
  3. Run the plugin, it is pretty self explanatory, select your cross sections and dem, choose a suitable sampling interval.
  4. Upon running the plugin, QGIS will add a new points file to the workspace, save this as a .csv. This file will contain the source of every cross section as well as the corresponding chainages and elevations.
  5. To split this data into individual .csv files in a format that TUFLOW can read in, download File:XSExtractor.xls
  6. Follow the instructions in the spreadsheet, after exporting to individual worksheets use the excel TUFLOW utilities "Export Entire Workbook to csv" to obtain all the cross sections in a TUFLOW format. The TUFLOW excel utilities can be downloaded from the TUFLOW downloads page.

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