gif creator

rgee_gif.R

library(rgee)

ee_Initialize()

col <- ee$ImageCollection("JRC/GSW1_1/YearlyHistory")$map(function(img) {
  year <- img$date()$get("year")
  yearImg <- img$gte(2)$multiply(year)
  despeckle <- yearImg$connectedPixelCount(15, TRUE)$eq(15)
  yearImg$updateMask(despeckle)$selfMask()$set("year", year)
})

appendReverse <- function(col) col$merge(col$sort('year', FALSE))

# -----------------------------------
# 1 Basic Animation - Ucayali Peru
# -----------------------------------

bgColor = "FFFFFF" # Assign white to background pixels.
riverColor = "0D0887" # Assign blue to river pixels.

## 1.1 Create the dataset
annualCol = col$map(function(img) {
  img$unmask(0)$
    visualize(min = 0, max = 1, palette = c(bgColor, riverColor))$
    set("year", img$get("year"))
})
basicAnimation <- appendReverse(annualCol)


## 1.2 Set video arguments
aoi <- ee$Geometry$Rectangle(-74.327, -10.087, -73.931, -9.327)
videoArgs = list(
  dimensions = 600, # Max dimension (pixels), min dimension is proportionally scaled.
  region = aoi,
  framesPerSecond = 10
)

## 1.2 Download, display and save the GIF!
animation <- ee_utils_gif_creator(basicAnimation, videoArgs)
get_years <- basicAnimation$aggregate_array("year")$getInfo()
animation %>%
  ee_utils_gif_annotate("Ucayali, Peru") %>%
  ee_utils_gif_annotate(get_years, size = 15, location = "+90+40",
                        boxcolor = "#FFFFFF") %>%
  ee_utils_gif_annotate("created using {magick} + {rgee}",
                        size = 15, font = "sans",location = "+70+20") ->
  animation_wtxt
animation_wtxt
ee_utils_gif_save(animation_wtxt, path = "raster_as_ee.gif")

https://user-images.githubusercontent.com/16768318/91145612-5afb3580-e67b-11ea-8da5-b560b4206b57.gif