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How are imagecollection reductions used in Google Earth?
Specifically, the output is computed pixel-wise, such that each pixel in the output is composed of the median value of all the images in the collection at that location. To get other statistics, such as mean, sum, variance, an arbitrary percentile, etc., the appropriate reducer should be selected and applied.
What is the native resolution of Google Earth?
The native resolution is the nominal pixel scale in meters of the lowest level of the image pyramid. Because each band of an image can have a different scale and/or projection, if you call projection () on an image with at least one band that doesn’t have the same projection as the others, you may see an error like:
How to reduce the resolution of satellite images?
Reduce the satellite data resolution 1 Reproject each images using projection from our shapefile using reproject method 2 Reduce the resolution for each satellite images to 25KM (25000 M) by calculating the average on each pixel using… 3 Clip the images, so we only have images that intersect with the shapefile using the clip method More
When to use resampling to reduce image resolution?
Reduce Resolution Suppose that instead of resampling during reprojection, your goal is to aggregate pixels to larger pixels in a different projection. This is useful when comparing image datasets at different scales, for example 30-meter pixels from a Landsat-based product to coarse pixels (higher scale) from a MODIS-based product.
Which is an example of reducing an imagecollection?
For an example of reducing an ImageCollection, consider a collection of Landsat 5 images, filtered by path and row. The following code uses reduce () to reduce the collection to one Image (here a median reducer is used simply for illustrative purposes):
How to reduce a region in Google Earth?
The region over which to reduce is shown in white. Note that in this example the reduction is specified by providing the reducer ( ee.Reducer.mean () ), the geometry ( region.geometry () ), the scale (30 meters) and maxPixels for the maximum number of pixels to input to the reducer. A scale should always be specified in reduceRegion () calls.
How to get statistics of an image region?
To get statistics of pixel values in a region of an ee.Image, use image.reduceRegion () . This reduces all the pixels in the region (s) to a statistic or other compact representation of the pixel data in the region (e.g. histogram).