> ## Documentation Index
> Fetch the complete documentation index at: https://docs.acreblitz.com/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> State which API version you are using. V1 uses https://esa.acreblitz.com/api/v1; V2 uses https://esa-v2.acreblitz.com/api/v2.
> Read /llms.txt for links to both versions. For V2 bulk integration, read bulk submission, status, results, and /v2/errors before constructing requests.

# Compute application-time drift buffers

> Refresh an application assessment with current wind and application setup

Refresh an application assessment with current wind and application setup.

## Request

<ParamField path="application_event_id" type="string" required>
  Opaque application-event reference from a previous ESA check.
</ParamField>

<ParamField body="wind_direction_deg" type="number" required>
  Wind direction in degrees, greater than or equal to 0 and less than 360.
</ParamField>

<ParamField body="wind_speed_mph" type="number" required>
  Wind speed, 0–80 mph.
</ParamField>

<ParamField body="temperature_f" type="number">
  Optional observed temperature, -100–200 degrees Fahrenheit; nullable.
</ParamField>

<ParamField body="humidity_percent" type="number">
  Optional observed humidity, 0–100; nullable.
</ParamField>

<ParamField body="application_method" type="string">
  Optional supported method; otherwise use the saved method.
</ParamField>

<ParamField body="droplet_size" type="string">
  Optional supported category/code; nullable. An omitted value uses the saved value; explicit null clears it.
</ParamField>

<ParamField body="boom_height" type="string">
  Optional `low` or `high`; nullable. An omitted value uses the saved value; explicit null clears it.
</ParamField>

<ParamField body="gpa" type="number">
  Optional positive spray gallons per acre; nullable. An omitted value uses the saved value; explicit null clears it.
</ParamField>

<ParamField body="rate_updates" type="object[]">
  Up to 100 rate changes. Each requires `product_index` (zero-based), `epa_number`, nonnegative `rate`, and nonempty `rate_unit`; optional `rate_unit_state` and positive `row_spacing_inches`. The index and registration must match the saved product.
</ParamField>

<ParamField body="geometry" type="string">
  `none`, `buffer`, `treatable`, or `both`; defaults to `none`.
</ParamField>

## Assessment behavior

The endpoint resolves your saved application, applies current weather/setup inputs and rate changes, and returns a refreshed check plus `application_time`. Weather and the assessment are saved for that application. It checks the application revision; conflicting changes return 409.

`application_time` includes submitted inputs, effective rates, reductions, manual mitigation claims, feature scope, feature counts, per-edge buffers, and product-specific buffer details. Requested field-boundary output is returned under `application_time.geometry` and is not retained in the saved assessment snapshot.

The returned `compliance.status` is authoritative for this assessment. Manual claims and conditions that cannot be verified remain explicit issues; a calculated buffer alone is not application clearance. Protected features are read for this request so new nearby features can affect the result.

The example shows selected response fields.

<RequestExample>
  ```bash cURL theme={null}
  curl --request POST 'https://esa-v2.acreblitz.com/api/v2/applications/019953f8-8c00-7000-8000-000000000002/drift-buffer/compute' \
    --header "X-API-Key: $ACREBLITZ_API_KEY" \
    --header 'Content-Type: application/json' \
    --data '{
    "wind_direction_deg": 180,
    "wind_speed_mph": 8,
    "temperature_f": 72,
    "humidity_percent": 55,
    "application_method": "Broadcast-Ground",
    "droplet_size": "VC",
    "boom_height": "low",
    "gpa": 15,
    "rate_updates": [
      {
        "product_index": 0,
        "epa_number": "7969-500",
        "rate": 28,
        "rate_unit": "fl oz/ac",
        "rate_unit_state": "L"
      }
    ],
    "geometry": "both"
  }'
  ```
</RequestExample>

<ResponseExample>
  ```json 200 — selected response fields theme={null}
  {
    "success": true,
    "application_event_id": "019953f8-8c00-7000-8000-000000000002",
    "application_time": {
      "checked_at": "2026-10-05T14:10:00.000Z",
      "status": "indeterminate",
      "feature_scope": "global_only",
      "non_managed_feature_count": 0,
      "exclusion_feature_count": 0,
      "inputs": {
        "wind_direction_deg": 180,
        "wind_speed_mph": 8,
        "temperature_f": 72,
        "humidity_percent": 55,
        "application_method": "Broadcast-Ground",
        "droplet_size": "very_coarse",
        "boom_height": "low",
        "gpa": 15
      }
    },
    "compliance": {
      "version": 1,
      "scope": "requirements_and_gaps",
      "status": "indeterminate"
    }
  }
  ```
</ResponseExample>

## Errors

Endpoint-specific errors include `404 APPLICATION_NOT_FOUND`; `422 NO_FIELD_GEOMETRY`, `PRODUCT_MISMATCH`, `INVALID_APPLICATION`, or `UNSUPPORTED_APPLICATION_METHOD`; and `409 DUPLICATE_FIELD`, `FIELD_OWNERSHIP_CONFLICT`, `DUPLICATE_APPLICATION`, `APPLICATION_FIELD_CONFLICT`, `PROCESSING_CONFLICT`, `FIELD_CHANGED`, or `APPLICATION_CHANGED`. Signed portal setup can return `503 PORTAL_SAS_UNCONFIGURED`. See [assessment issues](/v2/errors#assessment-issue-codes) for unresolved conditions returned with HTTP 200.

All routes can also return [authentication, validation, rate-limit, and dependency errors](/v2/errors#http-error-catalog). Use the [error catalog and examples](/v2/errors) to choose a retry or correction. Keep `X-Request-ID` when present.