---
title: "Subsurface Cross Correlate"
method: POST
path: "/api/v1/subsurface/cross-correlate"
tags: ["Subsurface Imaging"]
---

# Subsurface Cross Correlate

`POST /api/v1/subsurface/cross-correlate`

## Request

- Base URL: `https://www.deepmapai.com`
- URL: `https://www.deepmapai.com/api/v1/subsurface/cross-correlate`
- Auth: none declared

Compute noise cross-correlation between a station pair.

Downloads ambient noise records for two stations, applies
spectral whitening and temporal normalization, then computes the
cross-correlation to extract the empirical Green's function (EGF).
**Pricing:** Included in subscription tiers (legacy list price: GET /api/v1/billing/pricing).

Parameters (JSON body):
- station_pair : list[str] -- Two station codes (required)
- start_date : str -- Start date ISO 8601 (required)
- end_date : str -- End date ISO 8601 (required)
- freq_min : float -- Minimum frequency in Hz (optional, default 0.05)
- freq_max : float -- Maximum frequency in Hz (optional, default 0.5)

## Query parameters

- `x_api_key` string, nullable

## Request body

- object

## 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)