When we call ee functions we are creating elements that need to communicate with the server to work as we expect them to. The numerical values of the coordinates and the string ‘geometry’ text and even the Map.addLayer function are all client side objects. ImageCollection( 'LANDSAT/LC8_L1T_8DAY_NDVI'). Once we cover these elements we will move on to a more complex presentation of this material by reproducing the River Morphology Evaluation Toolbox (RMET) code to map the vegetation change of river deltas across the Landsat 5-8 collection timeframe (1984 to present). We will begin with simplified examples to provide a conceptual understanding of how the elements of GUI development work in GEE. Using NDVI derived from Landsat can we effectively distinguish the “A” on the hogback just west of Fort Collins from the surrounding vegetation in the summer?* To learn a bit more about each element we will use an example where we ask a simple question about the capabilities of a Landsat image. These three class elements are interconnected. Depending on the need, one can add three different classes of elements (widgets, panels, and events) to the existing GUI. While we cannot alter the base elements (map, task pane, etc.), we can add to their functionality. The Google Earth Engine Code Editor is a graphical user interface on its own. But this module will focus on the technical explanation of the GUI development more than the details of the scientific methods being presented.ģ Understanding the Graphical User Interface There are many interesting scientific questions that can be asked with the remote sensing of deltas. In this module we will adapt this work to visualize the changes in vegetation in three major river deltas from around the world. The analysis performed within the code is relatively simple because the goal of the project was to provide end users with a resource that was easy to understand and flexible enough to allow them to ask their own questions with the data. The project used data from Landsat 5, Landsat 7, Landsat 8, and Sentinel 2 to provide a visualization of 32 years of morphological changes within these river systems. The DEVELOP team created a GUI in GEE that allowed National Park Service employees to observe changes in fluvial and vegetative morphology of flood plains along stretches of the Colorado, Yampa, and Green Rivers in Utah and Colorado. 5.7.1 Develop the Panel Elements for the Change Mapsįor this module, we will be adapting a preexisting project completed by the Colorado NASA DEVELOP program in Summer of 2018.5.7 Generating the NDVI Difference Maps.5.5.6 Set Images of Interest to Predefined Local Variables.5.5.5 Define the Image Collection to Use.5.3 Visualizing the Graphic User Interface.4 RMET: River Monitoring and Evaluation Tool.3 Understanding the Graphical User Interface. With the launch of the live traffic widget, there are now 35 Google widgets available on Android. While the widgets are definitely a more convenient way of viewing app activity in some scenarios, they also serve another purpose: drawing more people into using the app overall, especially in times that previously would have felt too inconvenient. And with the new nearby traffic widget, launching in the coming weeks, you’ll see this information for your current location right from your Android Home screen,” the company said. “Whether you’re commuting or heading out to meet friends, Google Maps’ real-time traffic predictions can help you easily plan your route. You will still need to have Maps launched for it to work. The widget is rolling out to users in the coming weeks, so you might not yet see it in your widget library. Earlier you needed to open the app to see the traffic status, but now you can see it at a glance right from your home screen. The feature will work with zooming in and out to see traffic in a specific area without needing to look at the wider map in the app. The live traffic widget will be an extra, user-friendly tool for users, to give them a better idea of how busy an area will be in case they need to adjust their travel times or even routes to avoid the scrum, without needing to open the app. Google Maps already provides estimated arrival and travel times, and indicates when there is less or more congestion on your route with yellow/orange/red colors. Google Maps is introducing a new widget for Android that will be another use for the functionality that helped make a name for Waze, the other driving and mapping app that Google acquired nearly a decade ago: It will now show live traffic around you not just in the app but in a widget you can access on your lock screen.
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