The information of month, year and area are stored in a FeatureCollection, and were plotted by ui.Chart.feature.groups. In the chart, however, it is noted that the order of month columns is wrong.
How do I set a correct order of the columns?
The code below is for the FeatureCollection and chart plotting.
//The FeatureCollection//
var monthly = ee.FeatureCollection(
ee.List.sequence(0, monthCount.subtract(1))
.map(function (monthsOffset) {
var start = startDate.advance(monthsOffset, 'months')
var end = start.advance(1, 'months')
var ndwi = selectOrEmpty(ndwiCollection
.filterDate(start, end)
.median(),['NDWI'])
var imageWater = ndwi.gt(0)
.selfMask()
return ee.Feature(null,{
'area': area(imageWater),
'month': start.format('MM'),
'year': start.format('yyyy'),
//'system:time_start': start.millis()
})
})
).filter(ee.Filter.gt('area',5))
print(monthly)
//chart//
var chart = ui.Chart.feature.groups({
features: monthly,
xProperty: 'month',
yProperty: 'area',
seriesProperty: 'year' })
.setChartType('ColumnChart')
.setOptions({
title: 'Test',
hAxis: {
title: 'Month',
titleTextStyle: {italic: false, bold: true}
},
vAxis: {
title: 'Surface Area (sq.km)',
viewWindow: {min: 4.5, max: 7},
titleTextStyle: {italic: false, bold: true}
},
lineSize: 2,
});
print(chart)
Full code here: https://code.earthengine.google.com/8ce310596f9c2a46d4eac10f09726822