[gdal-dev] Difficulty opening Safecast GeoJSON data

[Mark Coletti]

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
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,"latitude":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":"cpm","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
-- 
mcoletti at gmail.com
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