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Where is the data? Will full dumps be made available under a permissive license or will we have to hope that "free" and "open" mean "we have an API and might s

by anc84 11y ago

Where is the data? Will full dumps be made available under a permissive license or will we have to hope that "free" and "open" mean "we have an API and might serve you something if we feel like it" as it too often does?

michaelt 11y ago
Even if they release the computed average road speeds, it would be difficult for them to release the individual traces while maintaining user privacy. After all, if a GPS trace starts at my home and ends at my work, that's going to be pretty easy to de-anonymise.
- maxerickson 11y ago
  Their architecture plan makes this clear, the idea is to only publicly share the anonymized data: https://github.com/opentraffic/architecture https://github.com/opentraffic/architecture
  - striking 11y ago
    But someone is keeping data that can be de-anonymized? That sounds dangerous.
- anc84 11y ago
  That should be a choice up to each person with a sensible default. You could let users define home/work zones where no data would be shared. You could add a bit of delay to the data transfer to be able to say "don't send anything from the first and last X minutes of moving". OSM is full of GPS traces volunteered from thousands or people. The NYC taxi data set is not that different and includes exactly the data you describe. I very much find the taxi data a inconsiderate breach of people's privacy as I doubt they were aware that this data might become available. But I consider volunteered detailed trace data perfectly fine and actually necessary for a open platform as you cannot reproduce results otherwise.
kuanbutts 11y ago
Data is - I believe - currently held on Conveyal's (the consultancy spearheading this) db. As I understand it, this has been developed in tandem with some World Bank initiatives and a test version of this is already operational with traffic data the WB has accrued in a number of international cities. Recent pushed wrt this project have been aimed at getting US cities on board, which (from personal experience) is much, much harder than getting buy-in on this type of work in cities abroad. And wrt anon data versus specific trip data - that is anonymized when the trips are uploaded to the system. There will be no way to identify specific trips with the tool.
- rmc 11y ago
  > And wrt anon data versus specific trip data - that is anonymized when the trips are uploaded to the system. There will be no way to identify specific trips with the tool. There is no way to 100% anonymise trips. Some will be deidentified.
  - kuanbutts 11y ago
    Data related to a single trip will not be kept - data on route segments is product of aggregates, as I understand.
rmc 11y ago
If it's based on OSM road geometry data (and or linked to it), the I think the OSM licence (the ODbL) kicks in and the derived database would have to be also under the ODbL.

by anc84 11y ago

michaelt 11y ago

Even if they release the computed average road speeds, it would be difficult for them to release the individual traces while maintaining user privacy. After all, if a GPS trace starts at my home and ends at my work, that's going to be pretty easy to de-anonymise.

maxerickson 11y ago
Their architecture plan makes this clear, the idea is to only publicly share the anonymized data: https://github.com/opentraffic/architecture https://github.com/opentraffic/architecture
- striking 11y ago
  But someone is keeping data that can be de-anonymized? That sounds dangerous.
anc84 11y ago
That should be a choice up to each person with a sensible default. You could let users define home/work zones where no data would be shared. You could add a bit of delay to the data transfer to be able to say "don't send anything from the first and last X minutes of moving". OSM is full of GPS traces volunteered from thousands or people. The NYC taxi data set is not that different and includes exactly the data you describe. I very much find the taxi data a inconsiderate breach of people's privacy as I doubt they were aware that this data might become available. But I consider volunteered detailed trace data perfectly fine and actually necessary for a open platform as you cannot reproduce results otherwise.

kuanbutts 11y ago

Data is - I believe - currently held on Conveyal's (the consultancy spearheading this) db. As I understand it, this has been developed in tandem with some World Bank initiatives and a test version of this is already operational with traffic data the WB has accrued in a number of international cities. Recent pushed wrt this project have been aimed at getting US cities on board, which (from personal experience) is much, much harder than getting buy-in on this type of work in cities abroad. And wrt anon data versus specific trip data - that is anonymized when the trips are uploaded to the system. There will be no way to identify specific trips with the tool.

rmc 11y ago
> And wrt anon data versus specific trip data - that is anonymized when the trips are uploaded to the system. There will be no way to identify specific trips with the tool. There is no way to 100% anonymise trips. Some will be deidentified.
- kuanbutts 11y ago
  Data related to a single trip will not be kept - data on route segments is product of aggregates, as I understand.

rmc 11y ago

If it's based on OSM road geometry data (and or linked to it), the I think the OSM licence (the ODbL) kicks in and the derived database would have to be also under the ODbL.