Viewer¶

Open this Viewer link set in Northeast Arizona. In the map menu, there are three layers with different datasets loaded including Landsat-8, Sentinel-2, and GOES-16.

Toggle a layer’s visibility on and off using the button to the left of the layer’s name represented by an eye. Use the hotkeys J and K to cycle layers up and down. All of the keyboard shortcuts are explained in the general tips and map toolbar legend. Click the question mark in the top right corner of the Viewer window to open the tips and toolbar legend.

Adding Layers¶

In the map menu click the ‘Add Layer’ button. Find the Landsat-7 Top of Atmospheric Reflection product (‘landsat:LE07:01:RT:TOAR’ ). You can manually select the date range.

Layer Opacity¶

Use the opacity slider beside the desired layer’s name to adjust its opacity.

Timeline Slider¶

GOES-16 has an incredible temporal resolution. To browse datasets temporally, use the timeline slider. Click the second button from the right by a layer’s name to anchor it to timeline, which will appear horizontally at the bottom of the screen. Change the unit of time in the bottom right hand corner by selecting “Minute”, “Day”, “Hour”, or “Week”. Orange blocks on the slider indicate the presence of imagery.

Scene Outlines¶

To toggle scene outlines, click the third button from the right by a layer’s name in the map menu.

Toggle map labels¶

Toggle the placenames and boundaries on and off by clicking the flag icon in the top right corner of the layer window.

Explore Band combinations¶

In the Viewer window, click the ellipsis beside a layer. Next, click “Edit Layer” to access product information and configurations. Inside of the menu, you will see information contained about the selected layer. Under the “Products” field you will see the product id. You can use this product id and date range to query for scenes. Play around with different band combinations (NIR and SWIR2 are great to look at in Sentinel-2 and Landsat-8).

Feature Metadata¶

To find the complete metadata associated with a feature, select the comment box icon in the top right hand corner of the layer window and click on an image to view its metadata.

Drawing vectors¶

Users can add polygons, points, squares and line vector features to your Viewer window. To access these tools, expand the toolbar menu on the right hand side of the window and begin editting.

Geojson files¶

On the side of the Viewer window, click to save features that were created using the draw function. The features will be saved to your downloads folder as a .geojson. To load a .geojson into viewer, click the “Upload features” button.