[GIS] Using ui.chart.image.series reducer with higher max pixel limit in Google Earth Engine

google-earth-enginetime series

Is it possible to use the ui.Chart.image.series function with an image collection, region, reducer, scale, AND a max pixel limit?

I'm dealing with 10m Sentinel-1 data, and even moderately sized regions hit the 1e7 default pixel count limit.

Anyway to override this in the time series plotting function?

I know how to do so using the "maxPixels:" argument in the image.ReduceRegion function. Essentially I want something like this

print(ui.Chart.image.series(collection, polygon, ee.Reducer.count(maxPixels: 1e12), 10));

Best Answer

You can't print more than 5000 things. That includes charts. To export time series of more data (and optionally chart them elsewhere), please see this tutorial.

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[GIS] Using reducer over space and time in Google Earth Engine

This is how I would solve it, which doesn't mean it's the best or even correct way to do it. But it works. The are some features that don't have the mean property, but I guess it is an issue of the image collection.

var rec1 = ee.Geometry.Polygon([[[-89.78276, 40.160312], [-89.78293, 40.153424],
      [-89.77108, 40.153424], [-89.77117, 40.160377]]]);

var rec2 = ee.Geometry.Polygon([[[-89.782848, 40.15335], [-89.782848, 40.14607],
      [-89.774522, 40.14607],[-89.774265, 40.15322]]]);

var featCol = ee.FeatureCollection([ee.Feature(rec1), ee.Feature(rec2)]);

/// get ImageCollection, and Image
var CDL= ee.ImageCollection("USDA/NASS/CDL")
var CDL_2015 = ee.Image('USDA/NASS/CDL/2015');

//Map.centerObject(CDL_2015)
Map.addLayer(CDL_2015)


/// For one image: works
var fieldStats_oneIm = CDL_2015.select("cropland")
.reduceRegions({
collection: featCol,
reducer: ee.Reducer.mean(),
scale: 30
});

// iterating function
var userFunc = function(image, list) {
  var newimg = image.select("cropland")
    .reduceRegions({
      collection: featCol,
      reducer: ee.Reducer.mean(),
      scale: 30
    })
  return ee.List(list).add(newimg)
}

// empty list to fill with features
var list = ee.List([])

// iterate over the image collection to fill the list
var fieldStats_list = ee.List(CDL.iterate(userFunc, list))

// Cast the list into a FeatCol
// as reduceRegions returns a FeatureCollection you have to flatten
var fieldStats_ImCol = ee.FeatureCollection(fieldStats_list).flatten();

// Print and show
print(fieldStats_oneIm, "fieldStats_oneIm")
print(fieldStats_ImCol, "fieldStats_ImCol")

Map.addLayer(fieldStats_ImCol)
Map.centerObject(featCol)

[GIS] Chlorophyll Timeseries in Google Earth Engine

replace Map.centerObject(chl_collection) for Map.centerObject(AOI) or just comment that line.

Best Answer

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