Thank you Even and Sean for your very quick and salient replies! I'll notify the Safecast folks that their data might be better served using GeoJSON; meanwhile, they also make their open source data available as a single downloadable file in CSV format. Since qgis can import files of that type, I've been using that; it's just that I have to do a lot more work on my end to pare the data down to the region of interest. (And deal with the inevitable data corruption. E.g., I suspect the observations from 2020 are bogus unless they have a time traveler volunteering radiation readings. =) )
Again, thank you for your help! Cheers, Mark On Mon, May 5, 2014 at 4:12 PM, Sean Gillies <[email protected]> wrote: > Hi Mark, > > Safecast's JSON isn't GeoJSON, but wouldn't be too hard to crosswalk over > to GeoJSON... make a geometry from its latitude/longitude, stuff all the > other attributes in properties. > > > On 5/5/14, 1:56 PM, Mark Coletti wrote: > >> >> Safecast is user sourced radiation data, and has a public API serving >> data in GeoJSON format (https://api.safecast.org/en-US/home). However, >> I'm having difficulty in accessing this data via OGR: >> >> % ogrinfo -so >> "https://api.safecast.org/en-US/measurements?distance=10&; >> latitude=37.42&longitude=141.033" >> ERROR 4: Failed to read GeoJSON data >> ERROR 4: Failed to read GeoJSON data >> FAILURE: >> Unable to open datasource >> `https://api.safecast.org/measurements.json?distance=10&; >> latitude=37.42&longitude=141.033' >> with the following drivers. >> >> So OGR sees that the data is formatted as GeoJSON, but is unable to read >> it for some reason. >> >> Using curl to manually make the query I get: >> >> % curl -i -H "Accept: application/json" >> "https://api.safecast.org/en-US/measurements?distance=10&; >> latitude=37.42&longitude=141.033" >> HTTP/1.1 200 OK >> Server: nginx >> Date: Mon, 05 May 2014 19:43:55 GMT >> Content-Type: application/json; charset=utf-8 >> Transfer-Encoding: chunked >> Connection: keep-alive >> Status: 200 OK >> Strict-Transport-Security: max-age=31536000 >> Access-Control-Allow-Origin: safecast.org <http://safecast.org> >> >> Access-Control-Allow-Methods: POST, GET, OPTIONS >> Access-Control-Allow-Headers: *, X-Requested-With >> Access-Control-Max-Age: 100000 >> X-UA-Compatible: IE=Edge,chrome=1 >> ETag: "e4650539a53d3698d8deb02e912b9ae3" >> Cache-Control: max-age=0, private, must-revalidate >> X-Request-Id: a30a38247c16374a39ada0a8d4d2fcde >> X-Runtime: 0.022855 >> X-Rack-Cache: miss >> X-Powered-By: cloud66 >> >> [{"captured_at":"2014-01-30T05:03:25Z","device_id": >> null,"id":30981293,"location_name":null,"original_id":null, >> "unit":"cpm","user_id":3,"value":4675.0,"latitude":37. >> 41997666666666,"longitude":141.03297166666667},{" >> captured_at":"2014-01-30T05:25:26Z","device_id":null,"id": >> 30981556,"location_name":null,"original_id":null,"unit":" >> cpm","user_id":3,"value":2470.0,"latitude":37.42001666666667,"longitude": >> 141.03303666666667},{"captured_at":"2014-01-30T05: >> 00:54Z","device_id":null,"id":30981263,"location_name":null, >> "original_id":null,"unit":"cpm","user_id":3,"value":5428.0,"latitude":37. >> 41996666666667,"longitude":141.03301666666667},{" >> captured_at":"2014-01-30T05:21:20Z","device_id":null,"id": >> 30981507,"location_name":null,"original_id":null,"unit":" >> cpm","user_id":3,"value":12191.0,"latitude":37. >> 420003333333334,"longitude":141.03305333333333},{" >> captured_at":"2014-01-30T05:00:49Z","device_id":null,"id": >> 30981262,"location_name":null,"original_id":null,"unit":" >> cpm","user_id":3,"value":5199.0,"lat >> > i > tude":37.41999666666667,"longitude":141.03306166666667} > ,{"captured_at":"2014-01-30T05:25:21Z","device_id": > null,"id":30981555,"location_name":null,"original_id":null, > "unit":"cpm","user_id":3,"value":2423.0,"latitude":37. > 42006833333333,"longitude":141.03301333333334},{" > captured_at":"2014-01-30T05:03:30Z","device_id":null,"id": > 30981294,"location_name":null,"original_id":null,"unit":" > cpm","user_id":3,"value":4456.0,"latitude":37.41992833333333,"longitude": > 141.03297333333333},{"captured_at":"2014-01-30T05: > 00:59Z","device_id":null,"id":30981264,"location_name":null, > "original_id":null,"unit":"cpm","user_id":3,"value":5672.0,"latitude":37. > 419963333333335,"longitude":141.03291666666667},{" > captured_at":"2014-01-30T05:00:44Z","device_id":null,"id": > 30981261,"location_name":null,"original_id":null,"unit":" > cpm","user_id":3,"value":5135.0,"latitude":37.420035," > longitude":141.03309},{"captured_at":"2014-01-30T05: > 21:14Z","device_id":null,"id":30981506,"location_name":null, > "original_id":null,"unit":"c > p > m","user_id":3,"value":12164.0,"latitude":37.42006333333333,"longitude": > 141.03293666666667}] > >> >> Those do look like legitimate observations, but I don't know if they >> comply to the GeoJSON format since I'm new to JSON. >> >> I'm using this version of GDAL/OGR, which was part of the pre-packaged >> binaries for qgis for my Mac: >> % ogrinfo --version >> GDAL 1.10.1, released 2013/08/26 >> >> Eventually I'd like to use GDAL/OGR to conveniently create a local >> spatial database from such a query. However, I need to get over this >> hurdle first. >> >> Cheers, >> >> Mark >> -- >> [email protected] <mailto:[email protected]> >> >> >> >> _______________________________________________ >> gdal-dev mailing list >> [email protected] >> http://lists.osgeo.org/mailman/listinfo/gdal-dev >> >> > -- > Sean Gillies > [email protected] > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev > -- [email protected]
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