How are images represented in Google Earth Engine?

How are images represented in Google Earth Engine?

As mentioned in the Get Started doc, raster data are represented as Image objects in Earth Engine. Images are composed of one or more bands and each band has its own name, data type, scale, mask and projection. Each image has metadata stored as a set of properties.

Where are image IDs stored in Earth Engine?

Each image has metadata stored as a set of properties. Images can be loaded by pasting an Earth Engine asset ID into the ee.Image constructor. You can find image IDs in the data catalog . For example, to load JAXA’s ALOS DSM :

How to add image collection to Google Earth?

Adding an image collection to a map is similar to adding an image to a map. For example, using 2016 images in the l8 collection and the visParams object defined previously, Note that now you can zoom out and see a continuous mosaic where Landsat imagery is collected (i.e. over land).

Can you reload images from Google Earth Engine?

Note that if you want to reload a Cloud Optimized GeoTIFF that you export from Earth Engine to Cloud Storage, when you do the export, set cloudOptimized to true as described here . In addition to loading images by ID, you can also create images from constants, lists or other suitable Earth Engine objects.

What are the bands in Google Earth Engine?

Images in Earth Engine (see this page for more details) are made up of one or more bands. Each band in an image has its own name, pixel values, pixel resolution, and projection. As you’ll soon discover, the SRTM image has one band: ‘elevation’.

How to load an image into Google Earth?

# Add the image layer to the map and display it. Note that the sort is after the filters. Avoid sorting the entire collection. You can use ee.Image.loadGeoTIFF () to load images from Cloud Optimized GeoTIFFs in Google Cloud Storage .

How to get projection information from Google Earth?

// Get projection information from band 1. // Get scale (in meters) information from band 1. // Note that different bands can have different projections and scale. // Get a list of all metadata properties.

How to filter data in Google Earth visualization?

Filter an image collection to include only relevant data that supports the purpose of the visualization. Consider dates, spatial extent, quality, and other properties specific to a given dataset. For instance, filter a Sentinel-2 surface reflectance collection by: or an image property. Chain multiple filters.

What is the palette parameter in Google Earth?

The palette parameter defines the colors to represent the 8-bit visualization image. It applies only to single-band representations; specifying it with a multi-band image results in an error.

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 does a reducer work in Google Earth?

As a result, the output image has the same number of bands as the input image; each band in the output is the reduction of pixels from the corresponding band in the input data. Some reducers take tuples of input datasets. These reducers will not be automatically replicated for each band.

How to calculate region in Google Earth Engine?

// Load input imagery: Landsat 7 5-year composite. // Load an input region: Sierra Nevada. // Reduce the region. The region parameter is the Feature geometry. // The result is a Dictionary. Print it. To force the computation, it suffices to print the result, which the Code Editor will display as a Dictionary in the console.

How to get metadata from Google Earth Engine?

// Get scale (in meters) information from band 1. // Note that different bands can have different projections and scale. // Get a list of all metadata properties. // Get a specific metadata property. // Get version number (ingestion timestamp as microseconds since Unix epoch). // Get the timestamp and convert it to a date.

How to set scale in Google Earth Engine?

See this page for more information about how Earth Engine handles scale. There are two ways to set the scale: by specifying the scale parameter, or by specifying a CRS and CRS transform. (See the glossary for more information about CRS’s and CRS transforms). For example, the meanDictionary reduction (above) is equivalent to the following: