I would like to export the image from the Google Earth Engine. However, it had Error: Export region contains no valid (un-masked) pixels. How to fix this error? This is the link of my google earth engine code: https://code.earthengine.google.com/707b7d4b84a0e14f0db74b38533666e6. The code is as follow:
// Load a Fusion Table of state boundaries and filter.
var fc = ee.FeatureCollection('ft:1tdSwUL7MVpOauSgRzqVTOwdfy17KDbw-1d9omPw')
.filterMetadata('Country','equals','New Zealand');
// Load Landsat 8 imagery and filter it
var collection = ee.ImageCollection('LANDSAT/LC08/C01/T1_SR')
.filterBounds(fc).set('SENSOR_ID', 'OLI_TIRS');
var filtered = collection
.filterMetadata('CLOUD_COVER', 'less_than', 10);
// Function to cloud mask from the Fmask band of Landsat 8 SR data.
function maskL8sr(image) {
var cloudShadowBitMask = ee.Number(2).pow(3).int();
var cloudsBitMask = ee.Number(2).pow(5).int();
var qa = image.select('pixel_qa');
var mask = qa.bitwiseAnd(cloudShadowBitMask).eq(0)
.and(qa.bitwiseAnd(cloudsBitMask).eq(0));
return image.updateMask(mask).divide(10000).float();
}
// Map the function .
var filtered_1 = filtered.map(maskL8sr);
function a(image) {
var equation = image.expression(
'(7.27 * B4/B3) - 1.7',
{
B3: image.select('B4'),
B4: image.select('B3'),
}).rename('NEW_A').float();
return image.addBands(equation);
}
var b = filtered_1.map(a).median();
print (b,'NEW_B');
// Display the results.
var vizParams = {bands: ['NEW_A'], min: 0, max: 100};
Map.addLayer(b, vizParams, 'recent value composite');
// Export the image, specifying scale and region.
Export.image.toDrive({
image: b,
description: 'NEW_B',
scale: 30,
});