Water Monitor Viewer Tutorial

Brief Description:

We present a system to monitor the surface water dynamics of all inland water bodies (at 500m resolution) at a global scale and across time (every 8 days starting from 2000). This system makes use of machine learning algorithms that are able to utilize the multi-spectral information collected via MODIS instruments on-board NASA satellites to classify every location (pixel) on the Earth at a given time as water or land. The number of pixels (at 500m resolution) labeled as water in a given region at a given time can then provide an estimate of the surface area of the water body in that region at that time.

Summary of Functionalities:

  1. Selecting the type of water body
  2. There are two types of water bodies that can be selected for visualizing their water dynamics:

    1. All Water Bodies: A water body is a contigous group of pixels that have been labeled as water for a majority of time-steps. They are shown as yellow dots in the map.
    2. Changing Water Regions: These are groups of pixels that have undergone change, either from land to water or water to land in the last 15 years. They are represented as cyan dots (Water Gain) and maroon dots (Water Loss) regions on the map.
    There are two ways to see the locations of water bodies of a particular type in a region:
    1. Subset/Region Select: Choose the desired continent in the "Load Data for" dropdown list.
    2. Lasso Tool: First select a continent or click on a tile. Then click on the "Aggregation" button under the Interactions pane. Then draw a closed polygon on the map and the timeseries for that region will be shown.

  3. Analyzing the dynamics of water bodies in a selected region:
  4. For every water body, we can summarize the dynamics in it's surface area using the following scores:

    1. Increase Score: This score measures the overall intensity of increase in the surface area of the water body (ignoring seasonal effects) across all time-steps.
    2. Decrease Score: This score measures the overall intensity of decrease in the surface area of the water body (ignoring seasonal effects) across all time-steps.

  5. Visualizing the water dynamics at a selected water body

Video Tutorials

Contact Us:

If you have any questions, comments, or suggestions regarding this work, please contact: Ankush Khandelwal (khand035@umn.edu). Thanks!