Providing an OGC API Processes REST Interface for FME Flow

Providing an
OGC API Processes
REST Interface
for FME Flow
con terra GmbH
The Peak of Data
and AI 2025

2025
The
Peak
of
Data
and
AI
Dennis
Wilhelm
con terra GmbH

1. OGC API Processes
2. Implementation
3. Demo
Agenda

2025
The
Peak
of
Data
and
AI
Source: https://xkcd.com/927/

2025
The
Peak
of
Data
and
AI
API Standardization
● Consistency across APIs helps with understanding and usage
● OpenAPI (Swagger) is the defacto standard for new APIs
● Machine readable deﬁnition
○ Automatic document generation
○ Automatic code generation

2025
The
Peak
of
Data
and
AI
New OGC APIs
New OGC API Legacy Usage
OGC API Features Web Feature Service Access to vector data
OGC API Maps Web Map Service Map visualization
OGC API Processes Web Processing Service Execution of processes & job
management
OGC API Coverages Web Coverage Service Raster data access
OGC API Records Catalogue Service for the Web Metadata queries

2025
The
Peak
of
Data
and
AI
OGC API Processes
The OGC API - Processes standard supports the wrapping of
computational tasks into executable processes that can be offered by
a server through a Web API and be invoked by a client application […].
Typically, these processes execute well-defined algorithms that ingest
vector and/or coverage data to produce new datasets.
Source: https://ogcapi.ogc.org/processes/

2025
The
Peak
of
Data
and
AI
OGC API Processes

2025
The
Peak
of
Data
and
AI
OGC API Processes ↔ FME Flow
OGC API Processes FME Flow
Processes Workspaces
Process Input Parameters Workspace Published Parameters
Results: by value / by reference Results: Streaming Service / Download Service
Sync / async process execution Sync / Async process execution (except data streaming 😢)
Jobs Jobs
Defined Process-Results Depends on the actual Workspace

2025
The
Peak
of
Data
and
AI
OGC API Processes ↔ FME Flow
OAP Adapter
Clien
t
FME
Flow

2025
The
Peak
of
Data
and
AI
List all processes
/repositories
/processes
OAP Adapter
/repositories/<repo>/items
/repositories/<repo>/items/<workspace>

2025
The
Peak
of
Data
and
AI
Run an asynchronous process
/fmedatastreaming/… (sync)
Transformation Results
/processes/[processID]
OAP-Job-ID
/jobs/[jobID]
Running/successfull/failed
Workspaces
Execution
OAP Adapter

2025
The
Peak
of
Data
and
AI
Parameter Mapping
● Parameter deﬁnitions are different and need to be mapped both ways

2025
The
Peak
of
Data
and
AI
Automatic Documentation for all processes

2025
The
Peak
of
Data
and
AI
Authentication
● Requirement of the customer was authentication via oAuth2
● Client Credential Grant for machine-to-machine authentication
● Custom implementation necessary, since FME doesn’t support this 😢

2025
The
Peak
of
Data
and
AI
Authentication
Authorization
Server
FME Flow
OGC Adapter
Client
1. Get Access Token
2. Request
with Token
4. Request with
technical user
3. Validate Token

2025
The
Peak
of
Data
and
AI
Get Process
Response
GET Request
/processes/Samples-austinDownload

2025
The
Peak
of
Data
and
AI
Execute Process
POST Request
/processes/Samples-austinDownload/execution
Request Body: Response

2025
The
Peak
of
Data
and
AI
Get Job Status and Job Results
GET Request
/jobs/b6467263-b58c-4f9d-9a88-c25552f09507
Response:
/jobs/b6467263-b58c-4f9d-9a88-c25552f09507/results
฀ https://<FME Flow>/fmedatadownload/results/FME_67373462_1745833697469_8593.zip

2025
The
Peak
of
Data
and
AI
“Writing your own API without
standards is like cooking without a
recipe—sure, it might work, but good
luck explaining it to anyone else.”
— ChatGPT

2025
The
Peak
of
Data
and
AI
Data Virtualization?
• Template implementation is almost done
• Will be provided as a Hub Template for free

2025
The
Peak
of
Data
and
AI
Recap:
● OGC API Processes offers a standardized access to
geospatial computational tasks
● The FME Flow adapter implementation enables seamless
adoption
● FME and OGC API Processes are a perfect match
● OpenAPI 3.0 improves API documentation and
interoperability

2025
The
Peak
of
Data
and
AI
ThankYou
Dennis Wilhelm
con terra GmbH
d.wilhelm@conterra.de

Providing an OGC API Processes REST Interface for FME Flow

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