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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 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.
How to get information from feature collection metadata?
Methods for getting information from feature collection metadata are the same as those for image collections. See the ImageCollection Information and Metadata section for details. You can use the aggregation shortcuts to count the number of features or summarize an attribute:
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:
Why is scale specified in reduceregion ( ) call?
A scale should always be specified in reduceRegion () calls. This is because in complex processing flows, which may involve data from different sources with different scales, the scale of the output will not be unambiguously determined from the inputs. In that case, the scale defaults to 1 degree, which generally produces unsatisfactory results.
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).
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 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.
Where to find imagecollection ID in Earth Engine?
ImageCollection Overview An ImageCollection is a stack or sequence of images. An ImageCollection can be loaded by pasting an Earth Engine asset ID into the ImageCollection constructor. You can find ImageCollection IDs in the data catalog.
How does a feature collection work in ArcGIS?
A feature collection is a type of feature layer. Any feature collection you add can be saved as part of the map. You can also save a feature collection as its own item by clicking Save Layer in the layer properties menu. The item will appear as a new feature collection item in My Content and can be shared with others and added to multiple maps.
Is there a way to add properties to a feature in the Gee?
Is there a way to add a property to a feature in the GEE. I know that you can edit existing properties with set (), but haven’t found a way to add a property. Thanks for contributing an answer to Geographic Information Systems Stack Exchange! Please be sure to answer the question.
How to iterate over an imagecollection in Google Earth?
With each call to iterate (), the anomaly is added to the running sum and the result is added to the list. The final result is passed to the ImageCollection constructor to get a new sequence of images: // Load MODIS EVI imagery. // Define reference conditions from the first 10 years of data.
How is the iterated function in Google Earth limited?
The iterated function is limited in the operations it can perform. Specifically, it can’t modify variables outside the function; it can’t print anything; it can’t use JavaScript ‘if’ or ‘for’ statements.