Extracting NDVI by regions defined by certain column using Google Earth Engine

Question

I am trying to extract NDVI values by regions of a certain polygon shapefile. I need, as output a graph (or a table) where the regions are defined by a certain column, called 'FID_incend'. I need exactly this column because those are unique values that I will use afterwards to process other maps.

My code is:

var incendis1987 = ee.FeatureCollection("users/oriolbaena/incendis1987_identityLitology_87929702_s_0p9HA_simplified");

Map.centerObject(incendis1987, 12);
Map.addLayer (incendis1987,{color: 'FF0000'})

var addNDVI = function (image){
  var ndvi= image.normalizedDifference(['B4', 'B3']).rename('NDVI');
  return image.addBands(ndvi)
};

var dataset = ee.ImageCollection("LANDSAT/LT05/C01/T1_SR")
    .filterBounds(incendis1987)
    .filterDate('1984-01-01', '1995-12-31')
    .map(addNDVI).select('NDVI');


var graph = ui.Chart.image.seriesByRegion({
imageCollection: dataset.select('NDVI'), 
regions: incendis1987,
reducer: ee.Reducer.mean(),
scale: 30,
seriesProperty: FID_incend,
})
  .setChartType('ScatterChart')
  .setOptions({title: 'NDVI Incendis1987 dates1984-1995', vAxis: {title:'NDVI'}, 
             lineWidth: 1,pointSize: 2,});
print(graph)
print ('I love JavaScript (L)')

As you can see, attibutes of my table include the column 'FID_incend':

The shp can be found here: https://code.earthengine.google.com/?asset=users/oriolbaena/incendis1987_identityLitology_87929702_s_0p9HA_simplified

Answer 1

Found your bug. It is so small, it is easy to overlook.

your seriesProperty isn't in "quotes". Modify your code in your ui.Chart.image.seriesByRegion() function dictionary. so that the series property is in quotes. It should work.

seriesProperty: "FID_incend",