I need to chart/download a list of 14-day summed precipitation values, and I was not able to get this script to run. I seem to be running into an error related to the 'system:time_start' property. I'm not sure how to proceed.
var Park = ee.Geometry.Polygon(
[[[-42.602889166173824, -19.690269395136024],
[-42.602889166173824, -19.75910638120446],
[-42.5081320860957, -19.75910638120446],
[-42.5081320860957, -19.690269395136024]]], null, false);
var roi = Park.geometry()
var START_DATE = "2016-01-01";
var STOP_DATE = "2022-01-01";
var rainfall = ee.ImageCollection('NASA/GPM_L3/IMERG_V06')
.filterBounds(roi)
.filterDate(START_DATE, STOP_DATE)
var list_dataset = rainfall.toList(ee.ImageCollection(rainfall.select('precipitationCal')).size());
var len = list_dataset.size();
var n = 14;
var list = ee.List.sequence(0, len.subtract(1), n);
var slicing_list = list.map(function(ele){
var start = ee.Number(ele).int();
var end = ee.Number(ele).add(n).int();
var new_list = ee.List([]);
var element = list_dataset.slice(start, end);
element = ee.ImageCollection(ee.List(element)).sum();
new_list = new_list.add(element);
return new_list;
}).flatten();
var raincol = ee.ImageCollection(slicing_list.get(0))
var chart = ui.Chart.image.series({
imageCollection: raincol,
region: roi,
reducer: ee.Reducer.median(),
scale: 100,
xProperty: 'system:time_start'
});
print(chart)