r.accumulate-iterative

This GRASS GIS addon is the iterative version of r.accumulate -r. It is already integrated into r.accumulate as the default algorithm (-r flag for the recursive version) and deprecated r.lfp.

Dear the reviewers of ENVSOFT_2020_505

For some reason, Mendeley's data upload did not work successfully and my dataset page lists no data files at all. Sorry for the inconvenience. Please use the following files for your review:

• create_test_location.sh
• grassdata.zip (5.3 GB)
• analysis.zip (397 MB)

How to create a test GRASS GIS location

System requirements: GRASS GIS 7.8.3 on Linux; this addon was not tested on Windows

1. Download create_test_location.sh, grassdata.zip, and analysis.zip in the same directory
2. Unzip grassdata.zip and analysis.zip
3. Run grass78

   grass78 -c test --exec ./create_test_location.sh

Five mapsets and 1,616 maps will be created in the test location:

1. PERMANENT: Not used
2. lfp-GA-input: Input rasters and vectors for Georgia (305 maps)
3. lfp-GA-hdd: Results for Georgia from the Linux HDD system (202 maps); you will have access to the maps in lfp-GA-input
4. lfp-GA-ssd: Results for Georgia from the Linux SSD system (202 maps); you will have access to the maps in lfp-GA-input
5. lfp-GA-archydropro: Results for Georgia from the Windows system (101 maps); you will have access to the maps in lfp-GA-input
6. lfp-TX-input: Input rasters and vectors for Texas (305 maps)
7. lfp-TX-hdd: Results for Texas from the Linux HDD system (200 maps); you will have access to the maps in lfp-TX-input
8. lfp-TX-ssd: Results for Texas from the Linux SSD system (200 maps); you will have access to the maps in lfp-TX-input
9. lfp-TX-archydropro: Results for Texas from the Windows system (101 maps); you will have access to the maps in lfp-TX-input

Maps

Both Georgia and Texas analyses used the same map names except for the following close-to-raw input maps:

• lfp-GA-input mapset
  • ned_1_ga: USGS National Elevation Dataset (NED) raster for Georgia (not clipped to the boundary)
  • statep010_ga: Mask raster for Georgia (clipped to the boundary)
• lfp-TX-input mapset
  • ned_1_tx: USGS NED raster for Texas (not clipped to the boundary)
  • statep010_tx: Mask raster for Texas (clipped to the boundary)

Inputs in the lfp-*-input mapset

• drain: Flow direction raster created by r.watershed
• accum: Flow accumulation raster created by r.accumulate, but it is only an intermediate output and not needed
• outlets100: 100 random outlet points vector for the batch experiment
• outlets100_1 through outlets100_100: The same 100 outlets, but each point individually in one vector map for the non-batch experiment
• basins100_subbasin_1 through basins100_subbasin_100: Each subwatershed in an individual raster map for masking
• basins100_archydropro_1 through basins100_archydropro_100: Each subwatershed in an individual vector map for setting the computational region; the above 100 subbasin rasters have the extent of the entire state

Outputs in both lfp-*-hdd and lfp-*-ssd mapsets

• lfp100_recursive: 100 longest flow paths generated by r.accumulate -r from the batch mode experiment
  • Missing in the Texas mapsets because r.accumulate -r failed
• lfp100_recursive_1 through lfp100_recursive_100: 100 individual longest flow paths generated by r.accumulate -r from the non-batch mode experiment
  • lfp100_recursive_51 is missing in the Texas mapsets because r.accumulate -r failed
• lfp100_iterative: 100 longest flow paths generated by this r.accumulate-iterative module
• lfp100_iterative_1 through lfp100_iterative_100: 100 individual longest flow paths generated by this r.accumulate-iterative module

Outputs in the lfp-*-archydropro mapset; imported from ArcGIS Pro geodatabases

• lfp100_archydropro: 100 longest flow paths generated by the Longest Flow Path tool in the Arc Hydro toolbox for ArcGIS Pro
• lfp100_archydropro_1 through lfp100_archydropro_100: 100 individual longest flow paths generated by the Longest Flow Path tool