#Web image collector 2013 how to#

var country_dataset = ee.FeatureCollection('USDOS/LSIB_SIMPLE/2017') You can choose your data upload ed to the GEE asset folder. We use country polygon data from the world boundaries dataset available in the earth engine. In this tutorial, we will use a country boundary, for example, Bangladesh, to filter collection. W e will filter image collection for only those geometries representing our study area. Geometry is a vector feature representing the location on the earth's surface. var filteredImage2020 = m圜ollection.filter(ee.Filter.date(startDate, endDate)) ī. We can also alternatively use ee.Filter.date function rather than filterDate. By defining the first year 2015 and the end year 2020, you can easily get each year’s image and calculate NDVI using the map function. For example, you want to calculate NDVI for the yearly Landsat 8 images from 2015-2020. Separately defining the start and end date can save time in that cases. Why separately defines the start and end date as a variable? Sometimes, it may require to do repetitive tasks. Var filteredImage2020 = m圜ollection.filterDate(startDate, endDate) For example - var startDate = “” // Year-Month-Day (YYYY-MM-DD) We can alternatively put the date in the filterDate by defining the startDate and endDate separately as a variable.

var filteredImage2020 = m圜ollection.filterDate(“, “”) Now, filter this collection for the year 2020. var m圜ollection = ee.ImageCollection('LANDSAT/LC08/C02/T1_TOA') įirst load, Landsat 8 image collection by defining a variable m圜ollection. The date is formatted in Year-Month-Day (YYYY-MM-DD). As a year starting from January 01 and ending on December 31, we can define the start date as and the end date as. The filterDate function requires two parameters start date and end date means the date of starting filter and the date of the ending filter.

In this exercise, we will filter our Landsat 8 image collection for the year 2020 only. In this tutorial, I will show you different ways of filtering image collection.Įarthengine provides a filterDate function to filter the collection by defining a date range. The filter also reduces the computation time as we collect only a limited image that requires for our work. So, we can focus on that particular location and filter image collection to get images for that particular location. Rather, we may be interested in a specific location or region. We may not work for the entire world for all time. W hat can we do? We can filter our image collection to reduce the number of images in our collection.Īnother thing, the Landsat 8 contains data from all over the world from 2013 to till now. If your image collection contains more than 5000 images, you cannot print them. The print function has limited to returning a maximum of 5000 elements at a time. Earth engine provides a print function that prints image meta to explore images. By default, the image collection contains all of the images available from 2013 to now worldwide. We have already collected Landsat 8 images. In this tutorial, I will show you why we need to filter and sort image collection and how we can do it.

#Web image collector 2013 how to#

I showed how to import Landsat 8 image collection in the image collection tutorial. Basics of Filtering and Sorting Image Collection in Google Earth Engine