Estimation of emissions — emis • vein

emis estimates vehicular emissions as the product of the vehicles on a road, length of the road, emission factor avaliated at the respective speed. \(E = VEH*LENGTH*EF(speed)\)

emis(
  veh,
  lkm,
  ef,
  speed,
  agemax = ifelse(is.data.frame(veh), ncol(veh), ncol(veh[[1]])),
  profile,
  simplify = FALSE,
  fortran = FALSE,
  hour = nrow(profile),
  day = ncol(profile),
  verbose = FALSE,
  nt = ifelse(check_nt() == 1, 1, check_nt()/2)
)

Arguments

veh: "Vehicles" data-frame or list of "Vehicles" data-frame. Each data-frame as number of columns matching the age distribution of that ype of vehicle. The number of rows is equal to the number of streets link. If this is a list, the length of the list is the vehicles for each hour.
lkm: Length of each link in km
ef: List of functions of emission factors
speed: Speed data-frame with number of columns as hours. The default value is 34km/h
agemax: Age of oldest vehicles for that category
profile: Dataframe or Matrix with nrows equal to 24 and ncol 7 day of the week
simplify: Logical; to determine if EmissionsArray should les dimensions, being streets, vehicle categories and hours or default (streets, vehicle categories, hours and days). Default is FALSE to avoid break old code, but the recommendation is that new estimations use this parameter as TRUE
fortran: Logical; to try the fortran calculation when speed is not used. I will add fortran for EmissionFactorsList soon.
hour: Number of considered hours in estimation. Default value is number of rows of argument profile
day: Number of considered days in estimation
verbose: Logical; To show more information
nt: Integer; Number of threads wich must be lower than max available. See check_nt. Only when fortran = TRUE

Value

If the user applies a top-down approach, the resulting units will be according its own data. For instance, if the vehicles are veh/day, the units of the emissions implicitly will be g/day.

Examples

if (FALSE) {
# Do not run
data(net)
data(pc_profile)
data(profiles)
data(fe2015)
data(fkm)
PC_G <- c(
  33491, 22340, 24818, 31808, 46458, 28574, 24856, 28972, 37818, 49050, 87923,
  133833, 138441, 142682, 171029, 151048, 115228, 98664, 126444, 101027,
  84771, 55864, 36306, 21079, 20138, 17439, 7854, 2215, 656, 1262, 476, 512,
  1181, 4991, 3711, 5653, 7039, 5839, 4257, 3824, 3068
)
pc1 <- my_age(x = net$ldv, y = PC_G, name = "PC")

# Estimation for morning rush hour and local emission factors and speed
speed <- data.frame(S8 = net$ps)
lef <- EmissionFactorsList(ef_cetesb("CO", "PC_G", agemax = ncol(pc1)))
system.time(E_CO <- emis(veh = pc1, lkm = net$lkm, ef = lef, speed = speed))
system.time(E_CO_2 <- emis(veh = pc1, lkm = net$lkm, ef = lef, speed = speed, simplify = TRUE))
identical(E_CO, E_CO_2)

# Estimation for morning rush hour and local emission factors without speed
lef <- ef_cetesb("CO", "PC_G", agemax = ncol(pc1))
system.time(E_CO <- emis(veh = pc1, lkm = net$lkm, ef = lef))
system.time(E_CO_2 <- emis(veh = pc1, lkm = net$lkm, ef = lef, fortran = TRUE))
identical(E_CO, E_CO_2)

# Estimation for 168 hour and local factors and speed
pcw <- temp_fact(net$ldv + net$hdv, pc_profile)
speed <- netspeed(pcw, net$ps, net$ffs, net$capacity, net$lkm, alpha = 1)
lef <- EmissionFactorsList(ef_cetesb("CO", "PC_G", agemax = ncol(pc1)))
system.time(
  E_CO <- emis(
    veh = pc1,
    lkm = net$lkm,
    ef = lef,
    speed = speed,
    profile = profiles$PC_JUNE_2014
  )
)
system.time(
  E_CO_2 <- emis(
    veh = pc1,
    lkm = net$lkm,
    ef = lef,
    speed = speed,
    profile = profiles$PC_JUNE_2014,
    simplify = TRUE
  )
)

# Estimation for 168 hour and local factors and without speed
lef <- ef_cetesb("CO", "PC_G", agemax = ncol(pc1))
system.time(
  E_CO <- emis(
    veh = pc1,
    lkm = net$lkm,
    ef = lef,
    profile = profiles$PC_JUNE_2014
  )
)
sum(E_CO)
system.time(
  E_CO_2 <- emis(
    veh = pc1,
    lkm = net$lkm,
    ef = lef,
    profile = profiles$PC_JUNE_2014,
    fortran = TRUE
  )
)
sum(E_CO)
system.time(
  E_CO_3 <- emis(
    veh = pc1,
    lkm = net$lkm,
    ef = lef,
    profile = profiles$PC_JUNE_2014,
    simplify = TRUE
  )
)
sum(E_CO)
system.time(
  E_CO_4 <- emis(
    veh = pc1,
    lkm = net$lkm,
    ef = lef,
    profile = profiles$PC_JUNE_2014,
    simplify = TRUE,
    fortran = TRUE
  )
)
sum(E_CO)
identical(round(E_CO, 2), round(E_CO_2, 2))
identical(round(E_CO_3, 2), round(E_CO_4, 2))
identical(round(E_CO_3[, , 1], 2), round(E_CO_4[, , 1], 2))
dim(E_CO_3)
dim(E_CO_4)
# but
a <- unlist(lapply(1:41, function(i) {
  unlist(lapply(1:168, function(j) {
    identical(E_CO_3[, i, j], E_CO_4[, i, j])
  }))
}))
unique(a)

# Estimation with list of vehicles
lpc <- list(pc1, pc1)
lef <- EmissionFactorsList(ef_cetesb("CO", "PC_G", agemax = ncol(pc1)))
E_COv2 <- emis(veh = lpc, lkm = net$lkm, ef = lef, speed = speed)

# top down
veh <- age_ldv(x = net$ldv[1:4], name = "PC_E25_1400", agemax = 4)
mil <- fkm$KM_PC_E25(1:4)
ef <- ef_cetesb("COd", "PC_G")[1:4]
emis(veh, units::set_units(mil, "km"), ef)

# group online
bus1 <- age_hdv(30, agemax = 4)
veh <- bus1
lkm <- units::set_units(400, "km")
speed <- 40
efco <- ef_cetesb("COd", "UB", agemax = 4)
lef <- ef_hdv_scaled(
  dfcol = as.numeric(efco),
  v = "Ubus",
  t = "Std",
  g = ">15 & <=18",
  eu = rep("IV", 4),
  gr = 0,
  l = 0.5,
  p = "CO"
)
for (i in 1:length(lef)) print(lef[[i]](10))
(a <- emis(veh = bus1, lkm = lkm, ef = efco, verbose = TRUE))
(b <- emis(veh = bus1, lkm = lkm, ef = efco, verbose = TRUE, fortran = TRUE))
}