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1

I am trying to create a chart that displays an image series from an Image Collection and there are two things that I do not understand:

1. In the first part of the code that you will see below, I do not get what the difference is between .median() and using a reducer: ee.Reducer.median() while plotting the chart? Does using it twice have a difference?



2. 
   

   My chart is plotting more than 12 images when there are only 12 images in the imageCollection.

   
   
   

    var clipper = function(image){
   
    return image.clip(geometry);
   
   };
   
   
   
   
   
   // Load the MODIS data that is being processed
   
   
   
   var modis = ee.ImageCollection('MODIS/006/MOD09GQ').map(clipper);
   
   var months = ee.List.sequence(1,12);
   
   
   
   // Group by month, and then reduce within groups by mean();
   
   // the result is an ImageCollection with one image for each
   
   // month.
   
   
   
   //ee.ImageCollection.fromImages - essentially includes a list of images
   
   
   
   var byMonth = ee.ImageCollection.fromImages(
   
     months.map(function(m) {
   
       return modis.filter(ee.Filter.calendarRange(m, m, 'month'))
   
                   .filterBounds(geometry)  
   
                   .median() // Unable to run this chunk of code without this function
   
                   .set('month', m);
   
   }));
   
   
   
   print("Monthly Images Median",byMonth);
   
   
   
   print(ui.Chart.image.seriesByRegion({
   
   imageCollection: byMonth,
   
   regions: geometry,
   
   reducer: ee.Reducer.median(),
   
   band: 'sur_refl_b01',
   
   scale: 250,
   
   xProperty: 'system:index',
   
   seriesProperty: 'label'
   
   }));
   
   

   
   

The chart looks like this:

google-earth-engine modis chart

share|improve this question

edited 18 mins ago

Vijay Ramesh

asked 27 mins ago

Vijay RameshVijay Ramesh

617220

add a comment | 

1

I am trying to create a chart that displays an image series from an Image Collection and there are two things that I do not understand:

1. In the first part of the code that you will see below, I do not get what the difference is between .median() and using a reducer: ee.Reducer.median() while plotting the chart? Does using it twice have a difference?



2. 
   

   My chart is plotting more than 12 images when there are only 12 images in the imageCollection.

   
   
   

    var clipper = function(image){
   
    return image.clip(geometry);
   
   };
   
   
   
   
   
   // Load the MODIS data that is being processed
   
   
   
   var modis = ee.ImageCollection('MODIS/006/MOD09GQ').map(clipper);
   
   var months = ee.List.sequence(1,12);
   
   
   
   // Group by month, and then reduce within groups by mean();
   
   // the result is an ImageCollection with one image for each
   
   // month.
   
   
   
   //ee.ImageCollection.fromImages - essentially includes a list of images
   
   
   
   var byMonth = ee.ImageCollection.fromImages(
   
     months.map(function(m) {
   
       return modis.filter(ee.Filter.calendarRange(m, m, 'month'))
   
                   .filterBounds(geometry)  
   
                   .median() // Unable to run this chunk of code without this function
   
                   .set('month', m);
   
   }));
   
   
   
   print("Monthly Images Median",byMonth);
   
   
   
   print(ui.Chart.image.seriesByRegion({
   
   imageCollection: byMonth,
   
   regions: geometry,
   
   reducer: ee.Reducer.median(),
   
   band: 'sur_refl_b01',
   
   scale: 250,
   
   xProperty: 'system:index',
   
   seriesProperty: 'label'
   
   }));
   
   

   
   

The chart looks like this:

google-earth-engine modis chart

share|improve this question

edited 18 mins ago

Vijay Ramesh

asked 27 mins ago

Vijay RameshVijay Ramesh

617220

add a comment | 

I am trying to create a chart that displays an image series from an Image Collection and there are two things that I do not understand:

1. In the first part of the code that you will see below, I do not get what the difference is between .median() and using a reducer: ee.Reducer.median() while plotting the chart? Does using it twice have a difference?



2. 
   

   My chart is plotting more than 12 images when there are only 12 images in the imageCollection.

   
   
   

    var clipper = function(image){
   
    return image.clip(geometry);
   
   };
   
   
   
   
   
   // Load the MODIS data that is being processed
   
   
   
   var modis = ee.ImageCollection('MODIS/006/MOD09GQ').map(clipper);
   
   var months = ee.List.sequence(1,12);
   
   
   
   // Group by month, and then reduce within groups by mean();
   
   // the result is an ImageCollection with one image for each
   
   // month.
   
   
   
   //ee.ImageCollection.fromImages - essentially includes a list of images
   
   
   
   var byMonth = ee.ImageCollection.fromImages(
   
     months.map(function(m) {
   
       return modis.filter(ee.Filter.calendarRange(m, m, 'month'))
   
                   .filterBounds(geometry)  
   
                   .median() // Unable to run this chunk of code without this function
   
                   .set('month', m);
   
   }));
   
   
   
   print("Monthly Images Median",byMonth);
   
   
   
   print(ui.Chart.image.seriesByRegion({
   
   imageCollection: byMonth,
   
   regions: geometry,
   
   reducer: ee.Reducer.median(),
   
   band: 'sur_refl_b01',
   
   scale: 250,
   
   xProperty: 'system:index',
   
   seriesProperty: 'label'
   
   }));
   
   

   
   

The chart looks like this:

google-earth-engine modis chart

share|improve this question

edited 18 mins ago

Vijay Ramesh

asked 27 mins ago

Vijay RameshVijay Ramesh

617220

share|improve this question

edited 18 mins ago

Vijay Ramesh

asked 27 mins ago

Vijay RameshVijay Ramesh

617220

share|improve this question

edited 18 mins ago

Vijay Ramesh

asked 27 mins ago

Vijay RameshVijay Ramesh

617220

asked 27 mins ago

Vijay RameshVijay Ramesh

617220

asked 27 mins ago

Vijay RameshVijay Ramesh

617220