# Output of a value at a given date and location in Google Earth Engine

I calculated the Albedo of a Greenland and would like to code it in a way that GEE gives out the value of the Albedo for a given date and location or to have an overview in a table. So far I was only able to implement a time range. I am unsure on what to code so that I receive the value of the location (e.g. with giving coordinates)

My Albedo calculation code:

``````var albedo = function(image){
var alb = image.expression(
"((0.356*blue)+(0.130*red)+(0.373*nir)+(0.085*swir)+(0.072*swir2)- 0.018)/ 1.016",
{
'red': image.select('B3'),
'blue':  image.select('B1'),
'nir':  image.select('B4'),
'swir':  image.select('B5'),
'swir2':  image.select('B7')
});
};

var dataset = ee.ImageCollection("LANDSAT/LC08/C01/T1_TOA")
.filterDate('2020-06-01', '2020-06-30')
.filterBounds(Greenland)
.map(albedo);

print("dataset",dataset);

var myAlbedo = dataset.select("albedo");
print("myAlbedo",myAlbedo);
``````

I assumed your AOI is in Greenland and took an arbitrary point in that region. For range dates in your code, only 3 images in Image Collection were selected for that point. So, you can print a paired list of dates and albedos directly in Console of GEE code editor by using an ee.Reducer object. Full code looks as follows:

``````var pt = ee.Geometry.Point([-48.08513183593751, 66.870153741717]);

var albedo = function(image){
var alb = image.expression(
"((0.356*blue)+(0.130*red)+(0.373*nir)+(0.085*swir)+(0.072*swir2)- 0.018)/ 1.016",
{
'red': image.select('B3'),
'blue':  image.select('B1'),
'nir':  image.select('B4'),
'swir':  image.select('B5'),
'swir2':  image.select('B7')
});
};

var dataset = ee.ImageCollection("LANDSAT/LC08/C01/T1_TOA")
.filterDate('2020-06-01', '2020-06-30')
.filterBounds(pt)
.map(albedo);

print("dataset",dataset);

var myAlbedo = dataset.select("albedo");
print("myAlbedo",myAlbedo);

var getAlbedo = function(image) {

// Reducing region and getting value
var value_albedo = ee.Image(image)
.reduceRegion(ee.Reducer.first(), pt)
.get('albedo');

return value_albedo;
};

var count = myAlbedo.size();

var albedo_list = myAlbedo.toList(count).map(getAlbedo);

print("albedo list", albedo_list);

var img = myAlbedo.first();

var allDates = myAlbedo.aggregate_array('system:time_start');

var allDatesSimple = allDates.map(function procDates (ele) {

return ee.Date(ele).format().slice(0,10);

});

var paired = allDatesSimple.zip(albedo_list);

print (paired);
``````

After running above code in GEE code editor, I got result of following image. In console you can observe the paired list of dates and albedos for that point. 