---
title: "Modal Tracking"
method: POST
path: "/api/v1/cross/wifi-rs-shm/modal"
tags: ["WiFi CSI + RS Building SHM"]
---

# Modal Tracking

`POST /api/v1/cross/wifi-rs-shm/modal`

## Request

- Base URL: `https://www.deepmapai.com`
- URL: `https://www.deepmapai.com/api/v1/cross/wifi-rs-shm/modal`
- Auth: none declared

Track building modal frequency shift for damage detection.

Compares current vs baseline modal frequencies.  Shift > 5%
indicates structural stiffness reduction.

**Pricing:** Included in subscription tiers (legacy list price: GET /api/v1/billing/pricing).

## Query parameters

- `x_api_key` string, nullable

## Request body

- ModalTrackRequest
  - `baseline_freq_hz` number, required: Baseline modal frequency (Hz)
  - `current_freq_hz` number, required: Current modal frequency (Hz)
  - `baseline_damping` number: Baseline damping ratio
  - `current_damping` number: Current damping ratio

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/deepmapai/apis/deepmap-ai.md) · [All operations](https://skmtc.dev/deepmapai/apis/deepmap-ai/llms.txt) · [OpenAPI document](https://skmtc.dev/deepmapai/apis/deepmap-ai/revisions/dab995d977d0?raw)