Fathom

Fathom provide flood hazard maps with global coverage. These maps can be retrieved and viewed directly in the Map view. This may be useful as part of your initial site appreciation investigations, for instance.

Accessing Fathom data

1. Zoom in on the area of interest. The tile downloaded from Fathom will cover the extent displayed on the map view.
2. On the Results tab, click the Fathom data button.
   Note

   The first time you access the tool, you will need to provide your Fathom account credentials in the Application Settings.
3. Select the datasets to download using the drop-boxes provided. Several of these provide multiple options, for example, you can select multiple return periods. 
4. Provide the Project ID. This can be in any text format, e.g. MyProjectID123, and is used as a reference by Fathom for itemised billing to your organisation.
5. Select the Output folder to which the retrieved datasets will be saved. You can also optionally provide a file suffix.
6. Click the Retrieve dataset(s) button. This will download the datasets and save them in your specified output folder.
7. Click the Close button to close the tool. 
8. Add a colour ramp to the flood map to aid with visualisation.

Providing account credentials

The first time you access Fathom data from Flood Modeller, you will need to enter your Client ID and Client Secret into the Application Settings. On the Home tab, click General to open the Application Settings window. Navigate to the Default Settings tab to enter your Fathom settings details.

If you do not have a Fathom account, fill in the following form and the Fathom team will get in touch: https://www.fathom.global/fathom-jacobs-licence/

Adding colour ramps

When you initially retrieve Fathom datasets, the entire area will be coloured. This is due to the default values used by Fathom. A colour ramp optimised for Fathom data can be downloaded and added to your Fathom datasets to resolve this.

To add the colour ramp:

1. In the Layers panel, double-click on your Fathom dataset
2. On the Colour ramp tab, click the yellow folder icon in the top left to Load colour ramp from file.
3. Navigate to the file above and click Open.
4. Click Apply and OK to save the changes.

The colour ramp can be customised further as required.

Fathom data FAQs