Retrieve Processing Units in Request Header

sentinel_hub_user · December 3, 2022, 1:06am

Hello,

We found a notebook to be able to get processing unit estimates for a request. See the following link:

sentinel-hub/sentinelhub-py/blob/master/examples/reading_pu_from_headers.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Retrieving information about processing units of requests\n",
    "\n",
    "In this example notebook we show how to retrieve **DownloadResponse** and **download headers** at the same time, which can be used to approximate the use of processing units.\n",
    "\n",
    "The tutorial assumes knowledge of [Sentinel Hub Process API](https://github.com/sentinel-hub/sentinelhub-py/blob/master/examples/process_request.ipynb) and [Sentinel Hub Statistical API](https://github.com/sentinel-hub/sentinelhub-py/blob/master/examples/statistical_request.ipynb) examples.\n",
    "\n",
    "For more information about the service please check the [official service documentation](https://docs.sentinel-hub.com/api/latest/api/process/)."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],

This file has been truncated. show original

We want to be able to get the processing units in a similar manner, but we are using the Sentinel Hub Statistical Download Client. I looked at the documentation for this, and it did not appear that we could use the same method to get the estimated Processing Units (sentinelhub.download.sentinelhub_statistical_client — Sentinel Hub 3.8.0 documentation).

Do you have a recommendation for getting the processing units while using the Statistical Download Client?

chung.horng · December 5, 2022, 9:21am

Hi @sentinel_hub_user ,

When using SentinelHubStatisticalDownloadClient, you could set decode_data to False while calling the download method to get the encoded result with headers.

client = SentinelHubStatisticalDownloadClient(config=config)

ndvi_stats = client.download(download_requests, decode_data=False)

Then you could call headers to retrieve the estimated processing units as shown in the example you provided. To decode the data after having the processing units retrieved, you could simply call the decode method, e.g., ndvi_stats[0].decode().

ksnn · December 21, 2023, 12:56am

Is it possible to retrieve other information from the headers such as retry-after or x-ratelimit-remaining?

According to the documentation, retry-after should also be available. Unfortunately, the only headers I can see, following your example code, are:

Date
Content-Type
Content-Length
Connection
access-control-allow-origin
access-control-allow-headers
access-control-allow-credentials
access-control-allow-methods
access-control-max-age
x-processingunits-spent

chung.horng · January 8, 2024, 11:11am

Hi @ksnn ,

retry-after only appears when you reach the rate limit, i.e., when the response having a status of 429. To find out the rate limit of your account, please refer to the Sentinel Hub pricing page.