--------------------
GENERAL INFORMATION
--------------------

1. Title of Dataset: Supplementary material for Ross et al. "Sediment storage and routing in bedrock canyons"

2. Author Information
	A. Principal Investigator Contact Information
		Name: Chloe Ross
		Institution:  Simon Fraser University
		Email: chloe_ross@sfu.a

	B. Associate or Co-investigator Contact Information
		Name: Jeremy Venditti
		Institution:  Simon Fraser University
		Email: jeremy_venditti@sfu.ca


3. Date of data collection: 2022-2023

4. Geographic location of data collection: Fraser Canyon, British Columbia, Canada

5. Information about funding sources that supported the collection of the data: 
Funding supported by a British Columbia Salmon Restoration Innovation Fund (BCSRIF) grant to JGV and 9 others, the Natural Science and Engineering Research Council of Canada (NSERC) Discovery Grant and Accelerator Supplement to JGV. The Hakai Institute provided in-kind support for geospatial data acquisition.


---------------------
DATA & FILE OVERVIEW
---------------------

1. File List

   A. Filename:  canyon_maps    
      Short description:   contains maps of canyon topography at all survey dates, as well as differenced topography for each timestep

   B. Filename:      river_metres 
      Short description:      shapfile of points extracted along fraser river centreline used for analysis  

   C. Filename:       sediment_patches
      Short description:	contains mapped patches shapefile and associated information in a csv


2. Relationship between files, if important: n/a

3. Additional related data collected that was not included in the current data package: 
Ross, C., Venditti, J. G., Larimer, J., and Viner, N.: Bathymetric Surveys of the Fraser Canyon (2021-2023), Federated Research Data Repository. https://doi.org/10.20383/103.01066, 2025

4. Are there multiple versions of the dataset? no

-----------------------------------------------------------------
DATA-SPECIFIC INFORMATION FOR: sediment_patches.csv
-----------------------------------------------------------------

PROCESSING:
	- Differenced survey DEMs to create an elevation change raster
	- Set colour ramp for elevation change raster to +/- 10m, then hand mapped patches
	- Created volume change raster by multiplying the elevation change raster by DEM cell area
	- Calculated zonal statistics for mapped patch area for both the elevation change raster, as well as volume change raster
	- Extracted points along polygon borders of mapped patches, then calculated distance of each point to nearest river metre point
	- Identified the max, min, and mean river metre identified for each patch (gives the upstream, downstream, and middle of patch along river centreline)
	- Calculated the total survey area for each canyon over each era as the number of cells in the DEM for that date multiplied by the cell area.

COLUMN NAMES AND MEANINGS:
	id_all: unique id for all patches over all eras
	canyon: canyon that patch was mapped within
	magnitude: whether change was positive ("pos") or negative ("neg")
	era: timestep between surveys, era 0 is 2204-2111, 1 is 2208-2204, and 2 is 2308-2208.
	id_era: unique id for patches within each era
	count: number of cells within mapped patch
	area: area of cells within mapped area (not the area of the polygon, but the cell count within the polygon multiplied by cell area)
	total_survey_area: area of the whole survey DEM (i.e. region of canyon with data collected) in which the patch was mapped
	v_sum: sum of values within each patch for volume change raster (i.e. total volume of change for that patch)
	e_sum: sum of values within each patch for elevation change
	e_mean: mean elevation value within patch
	e_median: median elevation value within patch
	e_stdev: standard deviation of elevation values within patch
	min_RM: minimum RM identified for points along border of that patch
	max_RM: max RM identified for points along border of that patch
	medan_RM: median RM identified for points along border of that patch
	min_RK: minimum RK identified for points along border of that patch
	max_RK: max RK identified for points along border of that patch
	medan_RK: median RK identified for points along border of that patch


-----------------------------------------------------------------
DATA-SPECIFIC INFORMATION FOR: river_metres
-----------------------------------------------------------------

Centreline in which points were extracted from is available here:

Wright, M., Venditti, J. (2024). Data archive for width and depth covariation within the bedrock Fraser Canyon, British Columbia, Canada. Federated Research Data Repository. https://doi.org/10.20383/102.0675 




