Description Usage Arguments Value
View source: R/saTransformation.R
Options are Stage’s (1976) COS, SIN; or Roberts & Cooper (1989) TRASP (topographic radiation aspect index). COS AND SIN - An a priori assumption of a maximum in the NW quadrant (45 azimuth) and a minimum in the SW quadrant can be replaced by an empirically determined location of the optimum (Stage, 1976). For slopes from 0 linearized and bounded from -1 to 1. Greater than 100 values greater than 100 zero to land oriented in a north- northeast direction, (typically the coolest and wettest orientation), and a value of one on the hotter, dryer south-southwesterly slopes. The result is a continuous variable between 0 - 1 (Roberts and Cooper 1989).
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elevation |
RasterLayer containing elevation values |
slope |
(optional) RasterLayer containing slope values. Value format must be percent. Default: NULL |
aspect |
(optional) RasterLayer containing aspect values. Note: North must be 0, and East must be 90. Default: NULL |
zscale |
Multiplicative factor to convert elevation units to horizontal units. Default: "1.0" |
transType |
Transformation type. Must be "COS", "SIN" or "TRASP". Default: "COS" |
output |
(optional) file name to save output. Default: NULL |
load_output |
If TRUE, function output file will be loaded into R. Default: TRUE |
quiet |
IF FALSE, console messages are shown. Default: TRUE |
... |
optional parameter for [RQGIS::run_qgis()] |
RasterLayer saTransformation
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