AreaD8: compute the D8 flow directions using a digital elevation...
In Issoufou-Liman/RTauDEM: Terrain Analysis Using Digital Elevation Models in R
Description
Usage
Arguments
Details
Value
Description
Take a DEM (typically the depression filled file returned by Pitremove),
and return a raster files containing the D8 slope and the D8 flow directions.
Usage
1
2
Arguments
fun
the name of flow direction function depending on the version TauDEM in use.
pfile
character, path to the input raster file. This is typically the flow direction raster file.
submited to pitremove function aprior).
ad8file
character, path to the output slope file to be computed along the way by D8Flowdir.
number_of_processes
number of MPI processes to be used. The default is 8.This is the
number of stripes that the domain will be divided into and the number of MPI parallel processes
that will be spawned to evaluate each of the stripes.
Details
TauDEM version 5.3 has been developed to read any raster supported by GDAL
and write grid files in the GeoTiff (.tif) format only. TauDEM reads and writes ESRI
shape files and text files generally identified using the .txt extension.
Calculates a grid of contributing areas using the single direction D8 flow model. The contribution of each
grid cell is taken as one (or when the optional weight grid is used, the value from the weight grid).
The contributing area for each grid cell is taken as its own contribution plus the contribution from upslope
neighbors that drain in to it according to the D8 flow model. If the optional outlet point shapefile is used,
only the outlet cells and the cells upslope (by the D8 flow model) of them are in the domain to be evaluated.
By default, the tool checks for edge contamination. This is defined as the possibility that a contributing
area value may be underestimated due to grid cells outside of the domain not being counted. This occurs when
drainage is inwards from the boundaries or areas with no data values for elevation. The algorithm recognizes
this and reports "no data" for the contributing area. It is common to see streaks of "no data" values
extending inwards from boundaries along flow paths that enter the domain at a boundary. This is the desired
effect and indicates that contributing area for these grid cells is unknown due to it being dependent on
terrain outside of the domain of data available. Edge contamination checking may be turned off in cases
where you know this is not an issue or want to ignore these problems, if for example, the DEM has been
clipped along a watershed outline.
Value
raster layer
Issoufou-Liman/RTauDEM documentation built on Oct. 30, 2019, 7:26 p.m.
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Description Usage Arguments Details Value
Description
Take a DEM (typically the depression filled file returned by Pitremove), and return a raster files containing the D8 slope and the D8 flow directions.
Usage
1 2 |
Arguments
fun |
the name of flow direction function depending on the version TauDEM in use. |
pfile |
character, path to the input raster file. This is typically the flow direction raster file. submited to pitremove function aprior). |
ad8file |
character, path to the output slope file to be computed along the way by D8Flowdir. |
number_of_processes |
number of MPI processes to be used. The default is 8.This is the number of stripes that the domain will be divided into and the number of MPI parallel processes that will be spawned to evaluate each of the stripes. |
Details
TauDEM version 5.3 has been developed to read any raster supported by GDAL and write grid files in the GeoTiff (.tif) format only. TauDEM reads and writes ESRI shape files and text files generally identified using the .txt extension.
Calculates a grid of contributing areas using the single direction D8 flow model. The contribution of each grid cell is taken as one (or when the optional weight grid is used, the value from the weight grid). The contributing area for each grid cell is taken as its own contribution plus the contribution from upslope neighbors that drain in to it according to the D8 flow model. If the optional outlet point shapefile is used, only the outlet cells and the cells upslope (by the D8 flow model) of them are in the domain to be evaluated. By default, the tool checks for edge contamination. This is defined as the possibility that a contributing area value may be underestimated due to grid cells outside of the domain not being counted. This occurs when drainage is inwards from the boundaries or areas with no data values for elevation. The algorithm recognizes this and reports "no data" for the contributing area. It is common to see streaks of "no data" values extending inwards from boundaries along flow paths that enter the domain at a boundary. This is the desired effect and indicates that contributing area for these grid cells is unknown due to it being dependent on terrain outside of the domain of data available. Edge contamination checking may be turned off in cases where you know this is not an issue or want to ignore these problems, if for example, the DEM has been clipped along a watershed outline.
Value
raster layer
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We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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