create_random_raster: Creates Random Rasters of Traces of a Specific Class.

In henningte/TraceIdentification: Identification of Fluorescent Traces in High-Resolution Aerial Images

Description

create_random_raster creates a set of different rasters with a specified number of rows and columns. For a set of classes, randomly 1 selected for each class and filled with the respective colour value. 20 cells will be enlarged by the next pixel to the right, to the top and to the top right. Each created raster will be exported as jpg file with a fixed resolution of 6000 times 6000 pixels. The funciton is used in order to create random rasters that serve as templates in order to collect test and training samples.

Usage

create_random_raster(n.col.raster = 200, n.row.raster = 200,
  colours.cells = c("lightgrey", "green", "red"), seed = c(1:4),
  directory.result)

Arguments

n.col.raster	A numeric value representing the number of columns of the raster to create.
n.row.raster	A numeric value representing the number of rows of the raster to create.
colours.cells	A character vector with colours to use for each class.
seed	A numeric vector with integers. For each element of seed, a random raster is created.
directory.result	A character string representing the directory where the results will be stored.

Value

The function returns nothing, but stores a jpg file of each created raster into directory.result. Created rasters have a resolution of 6000 times 6000 pixels and are named as raster_position_x_y where x is the respective element of seed and y the number of elements in colours.cells, i.e. the number of different classes.

Note

Since the function pos2coord is part of the package sinkr, but not implemented in its structure, the R script has to be sourced prior using create_random_raster. The function pos2coord can be retrieved from the github repository of the author of sinkr: https://github.com/marchtaylor/sinkr/blob/master/R/pos2coord.R.

Source

The function relies on the R packages raster (\insertCiteHijmans.2017TraceIdentification) and sinkr (\insertCiteTaylor.2017TraceIdentification).

References

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See Also

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Examples

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henningte/TraceIdentification documentation built on May 26, 2019, 6:50 p.m.