OpenStreetMap

Diari Pieren

Sentinel-2 satellites imagery can be used for OSM

Diposkan oleh Pieren pada 29 November 2014 dalam English

Here an interesting blog post from Jordi Inglada/CESBIO about the incoming imagery from the ESA/EU-Copernicus satellites Sentinel-2 (or here) which will be published with an open license compatible for OSM tracing. The program is designated for global land-cover mapping (4 bands at 10 m resolution).
Our challenge will be to retrieve this data in a usable form for us (e.g. georeferenced, rectified and cloudless, TMS served). Also Jordi Inglada says one word about open source softwares from CNES which could be used to convert pixels into landuse polygons.
As quoted from his blog: “This means that we have free data and free tools. Therefore, the complete pipeline is available for projects like OSM. OSM contributors could start right now getting familiar with these data and these tools.”

(from Sébastien Dinot talk-fr ML post)

Discussion

Ulasan imagico terhadap 29 November 2014 pada 12:23

There are a few aspects that should probably be kept in mind before getting too excited about this:

As it is the cited license would not allow use of data covered by it for OSM - it requires all derivative works to include a note ‘contains Copernicus data’ which cannot be ensured in OSM.
So far the release under open license is only an intention - it is not clear when this will happen (the satellites are not even launched yet), what processing level the data will have and if the data is really freely distributable or if you have to sign an agreement before you get access to it. The ESA track record in this regard is - to put it nicely - not that great.
Experience with use of automated land cover classification as a data source for OSM as suggested in the cited blog post has been very bad in the past. The very concept of automated classification into a fixed set of classes is at odds with the basic principles of OSM.

None the less should this imagery become freely available it will be a welcome addition to existing sources for mapping.

Ulasan Pieren terhadap 29 November 2014 pada 12:56

Launch is planned for april 2015 for the first satellite. About the attribution “contains Copernicus data (year of reception)”, perhaps a mention on the contributors specific attributions on the wiki would be enough.

Ulasan Aury88 terhadap 30 November 2014 pada 07:50

Hi Pieren, I was thinking the same thing but only for better visualize the buildings in the “third world” countries where the houses’s roofs are usually in metallic material and the rust make them very hard to see in the visible band . So these images could be very usefull also for the HOT project. I don’t know if a mention on the wiki is enought…probably it is better to ask :)

Ulasan BushmanK terhadap 29 Jun 2016 pada 16:14

This is an old topic, but since Google lists it on the first place when someone is looking for “Sentinel 2 OpenStreetMap”, I think, it worth mentioning. Copernicus data section of Contributors Wiki page Which means, it’s enough to add credit information such as “Copernicus Sentinel data [Year]” in source= of your changeset or specific feature.

Diari Pieren

Sentinel-2 satellites imagery can be used for OSM

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