How do I dynamically update an Isochron Map?
Use Volume Maths to create a volume based on the Isochron values and then extract them onto the horizon. As you make edits to the horizon map, Insight will dynamically update the volume.
![](https://media.screensteps.com/image_assets/assets/003/317/462/original/f3f3fe52-7a5b-4643-920d-26506091f645.png)
- Go to the Process tab and add a Volume Maths process.
- Add two horizons with the "+" in the Volume Maths panel and select horizons for h1 and h2 respectively e.g. Top and Base horizons for Isochron.
- Use the formula h1-h2 in the Formula text box. This will create an Isochron volume.
![](https://media.screensteps.com/image_assets/assets/003/317/464/original/477edf88-23a4-4bd5-a69b-eb4e1abdf7d7.png)
- Go to the View menu and display the volume in IL/CL View, with horizons overlaid.
![](https://media.screensteps.com/image_assets/assets/003/317/466/original/40914afa-aea2-4718-8236-fa9379350ad3.png)
- Display a horizon you wish to drape the isochron onto in Map View.
- Click ther Operations tab and perform amplitude extraction (learn about Amplitude Extraction).
![](https://media.screensteps.com/image_assets/assets/003/317/468/original/ef8dc66b-2818-4576-8058-00c034de616d.png)
- Create a Group with Isochron volume and Full Stack and set the Isochron volume opacity (in class) to mid (read about Creating a Group and Class Opacity).
- Edit anomalous values directly on the input horizons and the Volume and extraction will dynamically update.