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How To Use This Portal

Understanding The Data

When the map loads, you will find that SatSense subsidence data is rendered as a "velocity" layer above satellite imagery. The velocity layer is coloured to represent the average ground movements detected, with red representing subsidence and blue representing heave.

At zoom level 14 or above, you will be viewing point data. At this level of detail, you can see small scale movements, which is detailed enough to gather information about infrastructure or individual properties. At zoom level 13 or under, you will be viewing tile data. Tiles represent the average of the velocities of the points inside them. As a result, tiles represent larger scale movements.

Selecting and Deselecting Points

Whilst viewing point data (zoom level 14 or higher), you will be able to select points to see their time series information. You can select points by clicking on individual points or by using the polygon, rectangle or circle selection tools (the three buttons below + and -). When using these selection tools, point data inside the shape will be selected (with a limit of up to 20 points).

To aid comparison between points, any points that are selected will remain selected after closing the time series window. You can deselect individual points by re-clicking the point, or you can deselect everything by using the bin button in the top left corner.

Time Series Window

Once points are selected, the time series window will appear. It contains a graph of the selected points' displacements [mm] against time, and the graph pixels are colour coded to distinguish between points. You can hover over the pixels on the graph to display the point's date and displacement values.