How to format the channel heads file

[Antoine-CSQN]

Hello everyone,

I got my hands on a high resolution DEM (1m) and i'm very interessed in the LSDTopoTools since i've attented the EGU short course.

My interest is to cross geomorphogy with water chemistry (apparent retention / production of solutes in the hydrographic network).

I've tried the different algorithms (and parameters) for channel extraction and channel heads extraction and they perform very bad with the DEM I have.

I guess that the spatial resolution is good but the signal is very noisy, surface and objects were not properly separated from the LiDAR dataset. Unfortunately I don't have (and probally won't have access to) the raw Lidar data.

My question is, I have a fairly good map of the channel heads (the springs), I think I could use them to better extract my channels and compute the metrics.

I work with a DockerBox on W10 Pro and the ldstt complete package.

Thanks in advance.

PS: I did not find your e-mail online that's why I'm sending the mail on here.
PPS: I opened a "ticket" on GitHub as well, maybe it is a better place to discuss this.

[simon-m-mudd]

Sorry for the impossibly long wait to get an answer.
First, I suggest using LSDTopoTools2
Second, the channel heads input is slightly in need of updating, but to do it you need:

1. In the parameterfile input:
   CHeads_file: sources.csv

Note that you can name this file anything you like but it has to be a csv file

2. In that file, it can have multiple columns but it MUST have an "easting" and "northing" column. Those easting and northing columns need to be in the same UTM zone as the DEM you are using. Each source will have a row

3. You input this into lsdtt-channel-extraction with LSDTopoTools2