NDVI time series chart showing multiple values for the same point in Google Earth Engine

Question

I tried to generate a time series chart of NDVI using Sentinel-2 data for multiple points. But the chart has vertical plots with two values for same point and same date.

Here is the code:

var points = ee.FeatureCollection([
ee.Feature(geometry2, {label: 'm1'}),
ee.Feature(geometry3, {label: 'm2'}),
ee.Feature(geometry4, {label: 'm3'}),
ee.Feature(geometry5, {label: 'm4'}),
ee.Feature(geometry6, {label: 'm5'}),
ee.Feature(geometry7, {label: 'm6'}),
ee.Feature(geometry8, {label: 'm7'}),
ee.Feature(geometry9, {label: 'm8'}),
ee.Feature(geometry10, {label: 'm9'}),
ee.Feature(geometry11, {label: 'm10'})
]);

Map.addLayer(points);

// NDVI calculation



var addNDVI = function(image) {
  return image.addBands(image.normalizedDifference(['B8', 'B4']));

};

  var with_ndvi = puli.map(addNDVI);

  var rgb_vis = {min: 0, max: 5000, bands: ['B4', 'B3', 'B2']};
  Map.addLayer(puli, rgb_vis, 'RGB');
  Map.addLayer(with_ndvi, {bands: 'nd', min: 0, max: 1}, 'NDVI');



   // Time Series Analysis for NDVI

var TimeSeriesndvi = ui.Chart.image.seriesByRegion(with_ndvi,points,ee.Reducer.mean(),'nd',200, 'system:time_start', 'label')
.setChartType('ScatterChart')
        .setOptions({
          title: 'NDVI variations',
          vAxis: {title: 'NDVI'},
          lineWidth: 1,
          pointSize: 4,
          series: {
          // 0: {color: 'FF0000'}, 
          // 1: {color: '00FF00'},  
          //   2: {color: '0000FF'}, 
}});
print(TimeSeriesndvi);

Answer 1

Alternatively, there's a way to do that in LV.

• Open LV and locate an area of your interest and then highlight it with AOI tool.
• Click on “Time series analysis” icon on the left of the screen
• Set the values needed and hit "apply"

You can then export the data wherever you need it.