Refreshing live data layers

It's common to have data update on a regular basis, such as every week or every month. Instead of having to re-upload and style the new data, it can be very convenient to simply refresh a layer using a new data source.

A layer must have finished uploading successfully before it can be refreshed

Refreshing a layer with a file

Refreshing a file is a single function call using the felt-python library.

Just like regular file uploads, refreshing a layer with a new file is a two-step process:

1. Request a refresh via the Felt API

Perform a POST request to receive an S3 presigned URL which you can later upload your files to:

import requests

# Your API token should look like this:
# api_token = "felt_pat_ABCDEFUDQPAGGNBmX40YNhkCRvvLI3f8/BCwD/g8"
api_token = "<YOUR_API_TOKEN>"
map_id = "<YOUR_MAP_ID>"
layer_id = "<YOUR_LAYER_ID>"

r =
  headers={"Authorization": f"Bearer {api_token}"}
assert r.ok
presigned_upload = r.json()

2. Upload your file(s) to Amazon s3

# This code is a continuation of the previous Python code block
# and assumes you already have a "presigned_upload" variable
url = presigned_upload["url"]
presigned_attributes = presigned_upload["presigned_attributes"]
# A 204 response indicates that the upload was successful
with open(YOUR_FILE_WITH_EXTENSION, "rb") as file_obj:
    output =
        # Order is important, file should come at the end
        files={**presigned_attributes, "file": file_obj},

Refreshing a layer with a URL

Similar to a URL upload, refreshing an existing URL layer is just a matter of making a single POST request:

# Your API token and map ID should look like this:

curl -L \
  -X POST \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer ${FELT_API_TOKEN}" \

Last updated