> For the complete documentation index, see [llms.txt](https://help.felt.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.felt.com/field-app/collect-field-data.md).
# Capture field data
Capture points, lines, and polygons in the Felt Field App. Fill in forms, attach photos, and edit features in the field.
Capture points, lines, and polygons in the Field App, then fill in their forms and add photos. Someone with Edit access must first create the layer and form on the web. See [Run a field survey](/field-app/run-a-field-survey.md).
Online, your changes appear right away for everyone viewing the map. Offline, the Field App saves them and syncs them when you reconnect. See [Work offline](/field-app/work-offline.md).
## Add a feature in the Field App
The Field App places each point or vertex at the crosshair in the center of the map.
1. Open the map and tap the **+** button at the bottom right.
2. Under **Add feature**, select a layer from the list of layers you can add to. A crosshair appears.
3. Pan the map until the crosshair is where you want the point or the first vertex. Optional: To use your current location, tap the location button . The crosshair follows you.
4. Tap **Add point**. In a point layer, the layer's form opens.
5. For a line or polygon, pan and tap **Add point** for each remaining vertex, then tap **Next**. The layer's form opens.
6. Fill in the form and tap **Done**. The feature appears on the map for everyone viewing it.
While you draw, tap **Undo** or **Redo** in the toolbar at the top of the screen to step through your changes.
## Add photos to a feature
In the Field App, add photos through the photo field in a feature's form. The photo field comes from an **Image** attribute on the layer. See [Forms](/layers/forms.md).
1. In the feature's form, tap **Add images** in the photo field.
2. Take a photo, or choose one from your phone. The first time, allow Felt to use the camera.
3. Optional: Repeat to add more photos.
4. Tap **Done**.
Each photo can be up to 20 MB. See [Data limits](/upload-anything/data-limits.md). Field photos don't count toward processing or storage. See [Plan usage](/plans-and-billing/plan-usage.md).
## Edit a feature in the Field App
1. Tap the feature on the map, then tap the edit button in its popup. The form opens, and the feature's vertices appear.
2. Optional: Change the values in the form.
3. Optional: Change the shape. See [Feature shape edits](#feature-shape-edits).
4. Tap **Done**. Your changes appear for everyone viewing the map.
### Feature shape edits
To reshape a feature in the Field App, open it for editing and adjust it on the map.
| Change | How |
| ---------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Move a vertex | Tap the vertex, pan the map, and tap **Finish**. |
| Delete a vertex | Tap the vertex, then tap the trash button . |
| Add a vertex | Zoom in until pink hint vertices appear between the existing vertices, then tap one. |
| Move the whole feature | Tap **···** > **Move**, pan the map, and tap **Finish**. |
| Extend a line | Select the vertex at either end, tap **Extend**, and tap **Add point** for each new vertex. |
## Delete a feature in the Field App
Deleting a feature removes it from the layer for everyone, and it can't be undone in the Field App.
1. Tap the feature on the map, then tap the edit button .
2. Tap **···** > **Delete**.
3. Tap **Delete feature** to confirm. The feature disappears from the map.
---
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## Querying This Documentation
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Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:
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.png?alt=media&token=a0d38547-8091-45be-91eb-6b5401131b26)
at the bottom right.
2. Under **Add feature**, select a layer from the list of layers you can add to. A crosshair appears.
3. Pan the map until the crosshair is where you want the point or the first vertex. Optional: To use your current location, tap the location button 
. The crosshair follows you.
4. Tap **Add point**. In a point layer, the layer's form opens.
5. For a line or polygon, pan and tap **Add point** for each remaining vertex, then tap **Next**. The layer's form opens.
6. Fill in the form and tap **Done**. The feature appears on the map for everyone viewing it.
While you draw, tap **Undo** or **Redo** in the toolbar at the top of the screen to step through your changes.
in its popup. The form opens, and the feature's vertices appear.
2. Optional: Change the values in the form.
3. Optional: Change the shape. See [Feature shape edits](#feature-shape-edits).
4. Tap **Done**. Your changes appear for everyone viewing the map.
### Feature shape edits
To reshape a feature in the Field App, open it for editing and adjust it on the map.
| Change | How |
| ---------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Move a vertex | Tap the vertex, pan the map, and tap **Finish**. |
| Delete a vertex | Tap the vertex, then tap the trash button 
. |
| Add a vertex | Zoom in until pink hint vertices appear between the existing vertices, then tap one. |
| Move the whole feature | Tap **···** > **Move**, pan the map, and tap **Finish**. |
| Extend a line | Select the vertex at either end, tap **Extend**, and tap **Add point** for each new vertex. |
