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How to add another attribute to a featurecollection?
To apply the same operation to every Feature in a FeatureCollection, use featureCollection.map (). For example, to add another area attribute to every feature in a watersheds FeatureCollection, use:
How to create imagecollection in Google Earth Engine?
In addition to loading an ImageCollection using an Earth Engine collection ID, Earth Engine has methods to create image collections. The constructor ee.ImageCollection () or the convenience method ee.ImageCollection.fromImages () create image collections from lists of images.
How are feature collections used in Google Earth?
Groups of related features can be combined into a FeatureCollection, to enable additional operations on the entire set such as filtering, sorting and rendering. Besides just simple features (geometry + properties), feature collections can also contain other collections.
How to map the area over a featurecollection?
// Map the area getting function over the FeatureCollection. // Print the first feature from the collection with the added property. In the previous example, note that a new property is set based on a computation with the feature’s geometry. Properties can also be set using a computation involving existing properties.
How to create featurecollection in Google Earth Engine?
Individual geometries can also be turned into a FeatureCollection of just one Feature: // Create a FeatureCollection from a single geometry and print it. Earth Engine hosts a variety of table datasets.
Is there any way to convert hand-drawn geometries into an ee.featurecollection?
Is there any way to convert hand-drawn geometries into a ee.FeatureCollection, ee.Geometry or something similar; in order to be used at the first instance and without having to re-run the script after drawing?
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 imagecollection in Google Earth Engine?
// Load an image collection, filtered so it’s not too much data. // Compute the median in each band, each pixel. // The output is an Image. Add it to the map. This returns a multi-band Image, each pixel of which is the median of all unmasked pixels in the ImageCollection at that pixel location.
How to know the names of featurecollection columns?
Knowing the names and dataypes of FeatureCollection columns can be helpful (e.g., filtering a collection by metadata ). The following example prints column names and datatypes for a collection of point features representing protected areas. // Import a protected areas point feature collection.
Is there a way to reduce a featurecollection?
For more general purpose FeatureCollection aggregation tools, see the Reducing a FeatureCollection page. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies.