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Now, filter the l8 collection to get only the images that intersect the point, then add a second filter to limit the collection to only the images that were acquired in Filter as its argument. Explore the Docs tab of the Code Editor to learn more about these methods. The argument to filterBounds is the point you digitized and the arguments to filterDate are two dates, expressed as strings. Note that you can print the filtered collections. You can't print more than things at once, so you couldn't, for example, print the entire l8 collection. After executing the print method, you can inspect the printed collections in the console.
Note that when you expand the ImageCollection using the zippythen expand the list of features, you will see a list of images, each of which also can be expanded and inspected. This is one way to discover the ID of an individual image. Another, more programmatic way to get individual images for analysis is to sort the collection in order to get the most recent, oldest, or optimal image relative to some metadata property. You can use that property to get the least cloudy image in in your area of interest: Image sorted. Image before it's useable. The collection might store all types of things, so Earth Engine doesn't know the type of the object returned by first.
To use the object returned as an image, cast it using the image constructor. You're now ready to display the image!
Displaying RGB images When a multi-band image is added to a map, Earth Engine chooses the first three bands of the image and displays them as red, green, and blue by default, stretching them according to the data type, as described previously. Usually, this won't do. For example, if you add the Landsat image scene in the previous example to the map, the result is unsatisfactory: As a result, the image is displayed with the default visualization: This means that the coastal aerosol band 'B1' is rendered in red, the blue band 'B2' is rendered in green, and the green band 'B3' is rendered in blue. Specify which bands to use with the bands property of the visParams object.
Learn more about Landsat band combinations for visualization at this reference. You also need to provide min and max values suitable for displaying reflectance from typical Earth surface targets. Although lists can be used to specify different values for each band, here it's sufficient to specify 0. Combining the visualization parameters into one object and displaying: We are now going to define a study area using a point we select on the map. We will use the Geometry Tools to create that point. On the left side of the map, click the little marker icon. Your cursor should then turn into crosshairs.
We are now going to visualize one image from the Landsat 8 collection.
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googlf We are going to filter the collection down to one image by: However, we still need to visualize it, which we will do using the Map. Not sure what this function does? Search for it in the Docs tab to learn the arguments. We will use reflectance in the visible range from the red Band 4the green Band 3 and the blue Band 2 to make a true color image. We can use prior knowledge to make a nice image: This is why they added the Layer Manager tool which can be found in the upper right hand corner of the map. You can use this tool to figure out what parameters to pass to the Map.
You can also toggle between the Map or Satellite buttons in the top right of the map panel to change the baselayer.
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The Inspector console allows you to interactively query the map. If you selectiona imagery loaded, it will give you information about that imagery at the point you clicked as well. In the upper right, switch seldctions the Inspector tab and click on the map where there is land. Eadth. click where there is water. Toggle the between pUdating graph and the list of values. If you already did that, you can play with dropping the point somewhere else and looking Upadting a different image of your favorite place. You could also change the form to look at cataalog.
winter time image and see how the googld changes when there is snow on the ground. Getting Help There are many entry points for getting help tucked into the Code Editor. Familiarizing yourself with these tools can help soften the learning curve. The documentation is organized by GEE data type. Each data type has a specific set of functions that can be applied to it. Help Button The Help button is a gateway to many resources, including links to: This is the first place I go when I need to look up how to write some code. Since people share links to their codes, you can often find great examples of solutions here. A list of keyboard shortcuts links to the Suggest a Dataset page Examples in the Shared Scripts A final place you can get help is by scrolling down and looking at the examples housed in the Shared Scripts in the Scripts tab.
The Assets tab on the left is where you can import, share and manage these own assets. You can upload images or tables vector data here. For an example script that uses imported data, see Episode 06 Time Series. For detailed instructions from Google on uploading, sharing and managing assets, see the Assets Manager page on the GEE website. When run, these generate a new task in the Task tab in the upper right panel. Once you start an export task, you will be prompted to enter details about the resolution, size, format and destination if you did not include this in your code. We will do an example table export in Episode 3: Load Imagery of this tutorial. We will also have small export examples in subsequent modules of this tutorial.