# Survey & map

> Walk a floor plan or an outdoor route with a sensor, see Wi-Fi as a heatmap, compare with an earlier walk, and check emergency-location readiness.

Survey maps Wi-Fi readings: walk a floor plan or outdoor route, view a heatmap, compare walks and
export. The Location tool and Location Readiness Report show what the phone and network say about
where you are.

## What you need

- iPhone, iPad or Android, and a connected sensor for Wi-Fi readings. Without a sensor, a walk
  records positions only.
- A floor plan image, or an iPhone or iPad with LiDAR (iPhone 12 Pro or a later Pro/Pro Max, or a
  LiDAR-equipped iPad Pro). Room scanning is iPhone and iPad only.
- For outdoor surveys, location permission. Precise location gives better positions.

## How to walk a floor-plan survey

1. Open **Survey** from the expanded tab bar.
2. Import the plan. On iPhone, tap **+** › **Import Photo** (or **Import Floor Plan** when the list
   is empty). On Android, tap **+**. Choose an image.
3. Set the scale. Tap **Calibrate**, then tap two points a known distance apart, such as both sides
   of a doorway. Enter the distance in **Meters** and tap **Set Scale**. **Scale** shows the result.
4. Choose the Wi-Fi sensor. On iPhone, turn on **Wi-Fi** under the plan. The walk uses the device
   selected on **Devices**. On Android, tap the **Wi-Fi** chip, then **Wi-Fi sensor:** and pick a
   connected device.
5. Tap **Survey Walk**. The panel shows the sensor and the channels it will sweep. If no sensor is
   set, iPhone offers **Choose a Sensor**. Tap **Scan Settings** to change channels or dwell.
6. Tap **Start**. Each time you stop for a reading, tap your position on the plan. The waypoint
   count goes up.
7. Tap **Stop Walk**.
8. Change the heatmap. The map stays neutral until you pick a network. On iPhone, pick a network in
   **Target**, then a **Metric**: **RSSI**, **SNR**, **Noise**, **Radio clients** or **Channel
   utilization**. On Android, tap the target button, then the metric button (**RSSI**, **SNR**,
   **Noise**, **Clients**, **Load**). **Survey details** (iPhone) or **Details** (Android) shows
   statistics and an optional requirement.
9. Export. On iPhone, tap **…** › **Export Survey**. On Android, tap **More** › **Export Survey**.
   You get an `.openintent.zip` file. **Generate Survey Report** (iPhone) or **Generate and Share
   Report** (Android) makes a report instead.


## How to scan a room with LiDAR

iPhone and iPad with LiDAR only.

1. Optional: in **Survey**, tap **+** › **Survey Modes** and choose the **Wi-Fi device**. Its readings
   are recorded along your path.
2. Tap **+** › **Scan Room (LiDAR)**. Allow camera access if asked.
3. Walk the room slowly, pointing the camera at walls and floor. Use **Pause** and **Resume** between
   areas. Keep the app open: leaving it ends the scan.
4. Tap **Done**. The plan is saved already to scale, so you don't need to calibrate it. The app then
   builds a textured 3D model. Tap **Skip 3D** if you don't need it.
5. In the plan, **…** › **View Textured Scan** shows the model. Exports offer **Include Textured
   Scan**.

## How to survey outdoors with GPS

1. On iPhone, tap **Survey** › **+** › **Outdoor Survey**. On Android, tap **Outdoor** in **Survey**.
2. Choose what to record. On iPhone, turn on **Wi-Fi** and pick the **Wi-Fi device**. On Android, tap
   **Wi-Fi**, **Cellular** or **Wi-Fi + Cellular** and pick the device. On Android, tap **Enable
   precise location** if it appears.
3. Tap **Start survey** (iPhone) or **Start Survey** (Android). Positions come from the phone's GPS.
4. To drop a point, tap **Add marker at current position** (iPhone) or **Mark Point** (Android).
5. Tap **Stop & Save**, then **Export Survey**. For raw data, use **JSON, CSV and GeoJSON** (iPhone)
   or **Advanced Export: CSV / GeoJSON** (Android).

## How to compare with a previous survey

Finished walks on a floor plan, and outdoor surveys, are kept.

1. Walk the same plan or route again, and pick the same network as the target.
2. On iPhone, tap **Compare a previous survey**, choose one in **Previous recording**, and tap
   **Compare selected target**. On Android, open **Details** and tap a date under **Compare previous
   survey**.
3. Read the median before and after. Only fresh readings of the same radio at nearby positions are
   matched.

## How to check emergency-location readiness

The Location Readiness Report grades what nearby access points advertise about their location over
ANQP: coordinates, a civic address, or a location URI.

1. Connect a sensor and run a Passpoint scan with it ([how](/features/authentication/)).
2. Without disconnecting, record a capture with the same sensor and stop it. The report is saved
   beside the capture if the scan found at least one access point.
3. Open the capture. On iPhone, **Files** › **On This Device** › tap it. On Android, **Files** › tap it,
   or **⋮** › **Properties**.
4. In **Capture Properties**, under **Location Readiness**, tap **View Location Readiness Report**.
5. Read the **Venue** grade: **Not Assessed**, **None**, **Geo Only**, **Civic Only**, **Geo + Civic** or
   **LIS URI**. **About This Report** lists its limitations.

### The Location tool

Open **Location** from the expanded tab bar. It has four lenses:

- **Now**: the phone's position, accuracy and motion.
- **Track**: a position history, recorded only after you tap **Start recording** (iPhone) or turn on
  the **Recording** switch (Android).
- **Network**: location that access points advertise, beside the phone's own. **Scan AP location /
  FTM ranging** (iPhone) is experimental.
- **Reports**: saved readiness reports with their grades. iPhone only; Android shows it as not built
  yet.


## Tips

- **One reading does not locate an AP.** Antenna direction and your movement change what you measure.
- **Walk at the sweep's pace.** If the walk panel says the sweep is slower than walking pace, choose
  fewer channels or a shorter dwell.
- **Calibrate before exporting.** An export needs a real-world scale to place the walk.
- **Note position quality.** The outdoor survey warns when Precise Location is off or the phone
  reports a simulated location.
- **The readiness report is a reconstruction.** It grades what is observable. It places no call,
  contacts no emergency service, and certifies nothing. It is a local file, the feature sends
  nothing over the network, and emergency numbers and URIs are shown as plain text.
- **Surveys identify places.** Check them before you share them.
- **Wi-Fi plus cellular outdoors with a Mudi 7 is experimental**, and works only on its exact
  validated firmware, modem and support package. See [Mudi 7](/sensors/mudi-7/).

## If it doesn't work

| What you see | What to do |
|---|---|
| **Scan Room (LiDAR)** is greyed out | The device has no LiDAR. Import a floor plan image instead. |
| **Couldn't Set Scale** | Enter the distance as a number, such as 3.5, and check the two points. |
| Walk has positions but no Wi-Fi | No sensor was connected. Choose one and walk again. |
| **Retry Wi-Fi** during a walk | The sensor stopped sending readings. Tap it, or check **Devices**. |
| "Waiting for phone location fix…" (iPhone) | Move to open sky. Check Location Services for the app. |
| No **Location Readiness** section | Run a Passpoint scan with the same sensor before capturing. |
| Venue grade **Not Assessed** | No AP was assessed. Scan again closer to the access points. |

## Related

[Passpoint & authentication](/features/authentication/) · [Capture](/features/capture/) · [Files and exports](/guides/files-and-exports/) · [Mudi 7](/sensors/mudi-7/) · [iPhone & iPad](/app/ios/) · [Android](/app/android/)