Tagging Images

Terminology

  • Event: An Earth science event (for example, hurricane, cloud streets, etc).

  • Untagged: Newly imported or extracted images will have no tag.

  • Tag: When a user marks an image as either having or not having a particular Earth science event, the user has created a tag on the image. There is a limit of one tag per image.

  • Present: The tag created when an image contains the Earth science event.

  • Not Present: The tag created when an image does not contain the Earth science event.

Selecting Images for Tagging

After changing map output to the desired settings and exploring the map to the desired settings, users can draw a rectangular bounding box around a feature for extraction using the icon A small image of the button used to draw a rectangular bounding box on the map.. Please note that although drawing polygons A small image of the button used to draw a polygon, for shapefiles, on the map. and polylines A small image of the button used to draw a polyline, for creating a shapefile, on the map. are also supported, this feature only results in shapefiles, not extracted images. The A small image of the trash can icon that will remove all of the drawn layers on the map. icon will clear any polygons or bounding boxes drawn on the map.

The controls on the mapview, which is explained in the Using the GeoTIFFs Feature section, allows a user to obtain their desired image.

Controls Fields

  • Date: The date on the map for the image the user wants to extract. Changing the date updates the map.

  • Date Range: Date range for which to extract images. For example, the user could extract images of Australia for the first week of September 2018.

  • Sensor: The sensor to use for extracting the image. Changing the sensor also updates the map. For more information:

  • Product: The product to use for extracting the image. Changing the product also updates the map. For more information:

  • Clicking the Coastlines checkbox delineates the coastlines on the map. This is useful when a piece of land is covered by clouds.

  • Background: An option to display or hide the background. This is useful when a user wants to view the layers without any background image, or only view the coastlines.

Process of Tagging an Image

A user can tag images in three different areas of the ImageLabeler application. They can begin by navigating to the specific event that they wish to work on (explained in detail in the Event Pages section) and turn on work mode A small image of the work mode switch, which can be turned on or off. to begin marking images as present or not present.

The last area in which a user can tag an image is within the Mapview feature directly on the map. When a user wants to set the event or tag Status of a bounding box or polygon drawn on the map, the user clicks on the highlighted area and a list of events will pop up that give the user options for setting the status of an image. These options include selecting the event from the list and selecting if the event is present (Yes), not present (No), or untagged. Once the selection is made, the image is sent to the event page and placed under one of the tabs for that specific event (the tabs are covered in detail in the Using Event Pages section).

This image shows list of events that can be tagged.

Figure 16: List of events to tag a bounding box

Bounding Boxes

The user can draw rectangular bounding boxes on an image to indicate exactly where a particular Earth science event occurs.

In order to draw bounding boxes, the user clicks on the A small image of the button used to edit the bounding box, the button is found on the button panel. on the image’s detail view that pops up after selecting images on event pages. It is at bottom next to the downlaod button (see Figure 8).

The user can select a label (Present or Not Present) and draw a polygon to localize an event. User must click on A small image of the button used to edit the bounding box, the button is found on the button panel. to save the changes.

This image shows an example of a bounding box on an image.

Figure 17: Bounding box

The user can download the bounding boxes for an image in the VOC format by clicking on the A small image of the button used to draw a rectangular bounding box on the map. button on top-right corner on image window.