How to reduce the number of images in a collection?

How to reduce the number of images in a collection?

Chain multiple filters. Composite intra- and inter-annual date ranges to reduce the number of images in a collection and improve quality. For example, suppose you were to create a visualization of annual NDVI for Africa. One option is to simply filter a MODIS 16-day NDVI collection to include all 2018 observations.

How to control how image data is represented as color in collection visualization?

There are three ways to control how image data are represented as color in collection visualization methods: Provide visualization arguments directly to getVideoThumbURL and getFilmstripThumbURL. Map the visualize image method over the image collection prior to application of getVideoThumbURL and getFilmstripThumbURL.

How to convert an image list to an imagecollection?

// Convert the image List to an ImageCollection. The animation resulting from this collection is less noisy, as each image represents the median of a 16-day NDVI composite for 20+ years of data (Figure 1b). See this tutorial for more information on this animation.

How are images stored in a unique year collection?

In the following snippet, a unique year collection is defined and then a saveAll join is applied to identify all images that correspond to a given year. Images belonging to a given year are grouped into a List object which is stored as a property of the respective year representative in the distinct year collection.

Is there a way to resize multiple images at once?

Resize multiple images at once! Resize JPG, PNG, SVG or GIF by defining new height and width pixels. Change image dimensions in bulk. Upload your file and transform it. Upload from computer.

How to composite All images into one image?

This will composite all the images in the collection to a single image representing, for example, the min, max, mean or standard deviation of the images. (See the Reducers section for more information about reducers). For example, to create a median value image from a collection:

How to prepare an imagecollection for visualization?

These methods provide a quick assessment of the contents of an ImageCollection and an effective medium for witnessing spatiotemporal change (Figure 1). The following sections describe how to prepare an ImageCollection for visualization, provide example code for each collection visualization method, and cover several advanced animation techniques.