lineSource: Distribution of emissions by lines

In Schuch666/EmissV: Tools for Create Emissions for Air Quality Models

Distribution of emissions by lines

Description

Create a emission distribution from 'sp' or 'sf' spatial lines data.frame or spatial lines.

There 3 modes available to create the emission grid: - using gridInfo function output (defoult) - using the patch to "wrfinput" (output from real.exe) file or "geo" for (output from geog.exe) - "sf" (and "sp") uses a grid in SpatialPolygons format

The variable is the column of the data.frame with contains the variable to be used as emissions, by defoult the idstribution taken into acount the lench distribution of lines into each grid cell and the output is normalized.

Usage

lineSource(
  s,
  grid,
  as_raster = FALSE,
  type = "info",
  gcol = 100,
  grow = 100,
  variable = "length",
  verbose = TRUE
)

Arguments

s	SpatialLinesDataFrame of SpatialLines object
grid	grid object with the grid information or filename
as_raster	output format, TRUE for raster, FALSE for matrix
type	"info" (default), "wrfinput", "geo", "sp" or "sf" for grid type
gcol	grid points for a "sp" or "sf" type
grow	grid points for a "sp" or "sf" type
variable	variable to use, default is line length
verbose	display additional information

Value

a raster object containing the spatial distribution of emissions

Source

OpenstreetMap data avaliable https://www.openstreetmap.org/ and https://download.geofabrik.de/

See Also

gridInfo and rasterSource

Examples

# loading a shapefile with osm data for sao paulo metropolitan area
roads <- sf::st_read(paste0(system.file("extdata",package="EmissV"),"/streets.shp"))
d3    <- gridInfo(paste0(system.file("extdata", package = "EmissV"),"/wrfinput_d03"))

# calculating only for 2 streets
roadLength <- lineSource(roads[1:2,],d3,as_raster=TRUE)

# to generate a quick plot
raster::plot(roadLength,ylab="Lat", xlab="Lon",main="Length of roads")
# lines(road_lines)

Schuch666/EmissV documentation built on July 19, 2023, 10:36 a.m.