Created
November 23, 2021 14:49
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ls <- red_sample$geometry %>% head(1) | |
dem <- dem | |
C <- 0.6 | |
tobler_calle2 <- function(ls, dem, C){ | |
# puntos <- puntos_ordenados(ls,dem) | |
# puntos <- todos_los_puntos(ls, dem) | |
pts_orig <- ls %>% | |
st_cast('POINT') %>% | |
st_as_sf() %>% | |
rename(geometry = x) | |
# centroides_dem <- get_centroids_from_dem(ls,dem) | |
ls <- ls %>% st_as_sf() | |
celdas_dem <- extract(dem,ls, cellnumber = T)[[1]] | |
centroides_dem <- celdas_dem[,1] %>% xyFromCell(dem, cell = . , spatial = T) %>% st_as_sfc() | |
centroides_dem | |
pts_nuevos <- st_nearest_points(ls, centroides_dem) %>% | |
st_coordinates() %>% | |
data.frame() %>% | |
mutate(start_end = rep(c(1,2), times = n()/2)) %>% | |
filter(start_end == 1) %>% | |
st_as_sf(coords=c('X','Y'), crs = 32719) %>% | |
select(-c(L1,start_end)) | |
puntos <- pts_orig %>% bind_rows(pts_nuevos) | |
puntos <- puntos %>% | |
st_union() %>% | |
st_cast('POINT') | |
puntos | |
dem_linea <- extract(dem, puntos %>% st_as_sf(), method = 'bilinear') # convierte un objeto extraño en un objeto sf | |
N <- length(puntos)#largo de los puntos | |
d <- tibble(punto = puntos, dem_linea = dem_linea) | |
d | |
t_calle_ida2 <- d %>% | |
mutate( | |
punto_sig = lead(punto), | |
dx = map2_dbl(punto, punto_sig, st_distance), | |
dh = lead(dem_linea) - dem_linea, | |
slope = dh/dx, | |
pace_tramo = C * exp(3.5 * abs(slope + 0.05)), | |
t_tramo = pace_tramo * dx | |
) %>% | |
summarise(sum(t_tramo, na.rm = TRUE)) %>% | |
pull() | |
# t_calle_ida <- sapply(seq(N-1), function(i) iterador(i,puntos,dem_linea,C)) %>% sum() #funciones que aplican una función a cada elemento de una lista o vector. | |
t_calle_vuelta2 <- d %>% | |
mutate( | |
punto_sig = lag(punto), | |
dx = map2_dbl(punto, punto_sig, st_distance), | |
dh = lag(dem_linea) - dem_linea, | |
slope = dh/dx, | |
pace_tramo = C * exp(3.5 * abs(slope + 0.05)), | |
t_tramo = pace_tramo * dx | |
) %>% | |
summarise(sum(t_tramo, na.rm = TRUE)) %>% | |
pull() | |
# t_calle_vuelta <- sapply(seq(2,N) %>% rev , function(i) iterador(i,puntos,dem_linea,C, reverse = TRUE)) %>% sum() #funciones que aplican una función a cada elemento de una lista o vector. | |
#genera secuencia hasta N-1 y aplica la funcion iterador y suma el tiempo | |
t_calle2 <- mean(c(t_calle_ida2,t_calle_vuelta2)) | |
return(t_calle2) | |
} | |
library(furrr) | |
ncores <- availableCores() | |
plan(multisession, workers = ncores) | |
tic() | |
t3 <- map(seq(N), ~ tail(head(red_sample$geometry, .x), 1)) %>% | |
future_map_dbl(tobler, dem = dem, C = 0.6) | |
toc() | |
# identical(t1, t2) | |
identical(t1, t3) | |
tic() | |
t4 <- map(seq(N), ~ tail(head(red_sample$geometry, .x), 1)) %>% | |
future_map_dbl(tobler_calle2, dem = dem, C = 0.6) | |
toc() | |
identical(t1, t4) | |
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