# Extent

<figure><img src="/files/5SKEQP5YDFsmd9Tb5YqS" alt="" width="563"><figcaption></figcaption></figure>

IN THIS ARTICLE

Review the FieldDoc estimated extent, convert it to different units, or enter your own value.\
Note: These inputs are for reference only and are *not* used in any additional calculations or features.

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## Extent

This view allows you to input two types of extent:

1. **Estimated Geometric Extent** – Automatically calculated based on the dimensions (area, length, etc.) of the activity’s geometry. Many models and activity types require a unit input tied to geographic extent, so this value is useful to keep with your activity record.
2. **User-Defined Extent** – If your geometry doesn’t include a measurable extent (e.g., a point location), or if the estimate is inaccurate, you can manually enter an extent and select the appropriate unit. This will override the FieldDoc estimated extent, however the system-generated field will remain visible (you cannot delete it).

<table><thead><tr><th width="174.33984375">FieldDoc Field Name</th><th width="181">Import Field Name</th><th width="403.39453125">Description</th></tr></thead><tbody><tr><td>User Defined Extent</td><td>practice:extent</td><td>Enter in a numerical value for the activity record extent.</td></tr><tr><td>Unit</td><td>practice:extent_unit</td><td>Enter in the unit type, such as acres or linear feet.</td></tr></tbody></table>

{% hint style="warning" %}
The Extent fields are not automatically used to calculate most models. To run a model, you must enter in the unit input (which may be the extent available from this page) into the corresponding model input field and then press run.
{% endhint %}


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```
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```

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