Extracting River Sections in n4ce requires each section location to have a Baseline string with an associated number, for example, BL10, BL20 etc... Plus also the data associated with each location, generally the Hard Bed data to have the same string numbers. So that when n4ce tries to extract the section data, it knows what data goes with which section.
Adopting this coding philosophy on site is not always easy or practical though as the data can be picked up by different people, at different times. Plus the conditions are usually challenging, so sticking to a preset coding structure is not always conducive to actually recording the data quickly and easily.
To try and help, in n4ce 4.40 River Sections can now also be generated from a single continuous string. The act of re-coding the data and breaking it up is taken care of as part of the operation. It is assumed though that the First and Last points of each "location" are also the positions between which the sections will be established.
To start the conversion process, select the River Sections option from the Sections Menu/Tab. The following dialog will appear.
Set the extraction mode to Single Feature and in the Maximum Distance field, enter the approximate distance necessary to split the long features into individual section positions.
The Base Line Code is what will be used to duplicate the first and last points on each position, plus the first code in the String listing is what the sections will be re-coded to use. Both of these codes must also exist in the codetable before the process will be allowed to run.
After pressing Ok, click on the long feature to convert it to River Sections. The following box should then be displayed. Press Ok to continue.
The data in the model will update to reflect the coding changes, and the section preview box will appear as for normal Cross and River sections. If needed, the process can now be cancelled if additional profile data needs to be included, in which case, because the original data has been re-coded, it can be run again just as normal river sections. Otherwise, close the preview window, name the sections and plot them as normal.