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Open Maps - Federal Geospatial Platform Harvester

The Open Government Secretariat's (OGS) Open Maps (OM) harvester pulling from the Federal Geospatial Platform (FGP) developed and maintained at Statistics Canada (StatCan).

Harvester - FGP - Diagram

harvest_hnap.py

Extract HNAP XML from the CSW source. Prints xml out to be piped to another command or to a file.

./harvest_hnap.py > hnap.xml
or
./harvest_hnap.py | parsing_command

Presently extracts everything but will eventually extract a window of data (e.g.: metadata records updated in the last two weeks). The alternate time filtering request available and commended out in the script.

This process runs in a few seconds depending on network latency.

hnap2cc-json.py

Converts HNAP XML file to a Common Core mapped CKAN compliant JSON Lines file. Accepts streamed in or file path as an argument and prints out JSON Lines output.

./harvest_hnap.py | ./hnap2json.py > CommonCore_CKAN.jsonl
or
cat hnap.xml | ./hnap2json.py > CommonCore_CKAN.jsonl
or
./hnap2json.py hnap.xml > CommonCore_CKAN.jsonl

This process runs in a couple seconds.

Import to CKAN

Uploading the JSON Lines file has been tested with the ckanapi CLI

ckanapi load datasets -I CommonCore_CKAN.jsonl -r http://target.ckan.instance.ca/ -a <user api key>

This process runs, depending on how much data is being pushed, in under 20 seconds.

Timing

Since each of these commands totalled run in under a minute this process could safely cycle every 5 minutes but considering how the GeoNetwork uploads in batches (and other departments might too) we should be more careful.

From a process standpoint, for R1 daily or weekly is reasonable. We’ll start assuming weekly till we hear otherwise.