<div dir="ltr">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. =) )<div>
<br></div><div>Again, thank you for your help!</div><div><br></div><div>Cheers,</div><div><br></div><div>Mark</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, May 5, 2014 at 4:12 PM, Sean Gillies <span dir="ltr"><<a href="mailto:sean@mapbox.com" target="_blank">sean@mapbox.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Mark,<br>
<br>
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.<div><div class="h5"><br>
<br>
On 5/5/14, 1:56 PM, Mark Coletti wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5">
<br>
Safecast is user sourced radiation data, and has a public API serving<br>
data in GeoJSON format (<a href="https://api.safecast.org/en-US/home" target="_blank">https://api.safecast.org/en-<u></u>US/home</a>). However,<br>
I'm having difficulty in accessing this data via OGR:<br>
<br>
% ogrinfo -so<br>
"<a href="https://api.safecast.org/en-US/measurements?distance=10&latitude=37.42&longitude=141.033" target="_blank">https://api.safecast.org/en-<u></u>US/measurements?distance=10&<u></u>latitude=37.42&longitude=141.<u></u>033</a>"<br>
ERROR 4: Failed to read GeoJSON data<br>
ERROR 4: Failed to read GeoJSON data<br>
FAILURE:<br>
Unable to open datasource<br>
`<a href="https://api.safecast.org/measurements.json?distance=10&latitude=37.42&longitude=141.033" target="_blank">https://api.safecast.org/<u></u>measurements.json?distance=10&<u></u>latitude=37.42&longitude=141.<u></u>033</a>'<br>
with the following drivers.<br>
<br>
So OGR sees that the data is formatted as GeoJSON, but is unable to read<br>
it for some reason.<br>
<br>
Using curl to manually make the query I get:<br>
<br>
% curl -i -H "Accept: application/json"<br>
"<a href="https://api.safecast.org/en-US/measurements?distance=10&latitude=37.42&longitude=141.033" target="_blank">https://api.safecast.org/en-<u></u>US/measurements?distance=10&<u></u>latitude=37.42&longitude=141.<u></u>033</a>"<br>
HTTP/1.1 200 OK<br>
Server: nginx<br>
Date: Mon, 05 May 2014 19:43:55 GMT<br>
Content-Type: application/json; charset=utf-8<br>
Transfer-Encoding: chunked<br>
Connection: keep-alive<br>
Status: 200 OK<br>
Strict-Transport-Security: max-age=31536000<br></div></div>
Access-Control-Allow-Origin: <a href="http://safecast.org" target="_blank">safecast.org</a> <<a href="http://safecast.org" target="_blank">http://safecast.org</a>><div><div class="h5"><br>
Access-Control-Allow-Methods: POST, GET, OPTIONS<br>
Access-Control-Allow-Headers: *, X-Requested-With<br>
Access-Control-Max-Age: 100000<br>
X-UA-Compatible: IE=Edge,chrome=1<br>
ETag: "<u></u>e4650539a53d3698d8deb02e912b9a<u></u>e3"<br>
Cache-Control: max-age=0, private, must-revalidate<br>
X-Request-Id: a30a38247c16374a39ada0a8d4d2fc<u></u>de<br>
X-Runtime: 0.022855<br>
X-Rack-Cache: miss<br>
X-Powered-By: cloud66<br>
<br>
[{"captured_at":"2014-01-<u></u>30T05:03:25Z","device_id":<u></u>null,"id":30981293,"location_<u></u>name":null,"original_id":null,<u></u>"unit":"cpm","user_id":3,"<u></u>value":4675.0,"latitude":37.<u></u>41997666666666,"longitude":<u></u>141.03297166666667},{"<u></u>captured_at":"2014-01-30T05:<u></u>25:26Z","device_id":null,"id":<u></u>30981556,"location_name":null,<u></u>"original_id":null,"unit":"<u></u>cpm","user_id":3,"value":2470.<u></u>0,"latitude":37.<u></u>42001666666667,"longitude":<u></u>141.03303666666667},{"<u></u>captured_at":"2014-01-30T05:<u></u>00:54Z","device_id":null,"id":<u></u>30981263,"location_name":null,<u></u>"original_id":null,"unit":"<u></u>cpm","user_id":3,"value":5428.<u></u>0,"latitude":37.<u></u>41996666666667,"longitude":<u></u>141.03301666666667},{"<u></u>captured_at":"2014-01-30T05:<u></u>21:20Z","device_id":null,"id":<u></u>30981507,"location_name":null,<u></u>"original_id":null,"unit":"<u></u>cpm","user_id":3,"value":<u></u>12191.0,"latitude":37.<u></u>420003333333334,"longitude":<u></u>141.03305333333333},{"<u></u>captured_at":"2014-01-30T05:<u></u>00:49Z","device_id":null,"id":<u></u>30981262,"location_name":null,<u></u>"original_id":null,"unit":"<u></u>cpm","user_id":3,"value":5199.<u></u>0,"lat<br>
</div></div></blockquote><div><div class="h5">
i<br>
tude":37.41999666666667,"<u></u>longitude":141.03306166666667}<u></u>,{"captured_at":"2014-01-<u></u>30T05:25:21Z","device_id":<u></u>null,"id":30981555,"location_<u></u>name":null,"original_id":null,<u></u>"unit":"cpm","user_id":3,"<u></u>value":2423.0,"latitude":37.<u></u>42006833333333,"longitude":<u></u>141.03301333333334},{"<u></u>captured_at":"2014-01-30T05:<u></u>03:30Z","device_id":null,"id":<u></u>30981294,"location_name":null,<u></u>"original_id":null,"unit":"<u></u>cpm","user_id":3,"value":4456.<u></u>0,"latitude":37.<u></u>41992833333333,"longitude":<u></u>141.03297333333333},{"<u></u>captured_at":"2014-01-30T05:<u></u>00:59Z","device_id":null,"id":<u></u>30981264,"location_name":null,<u></u>"original_id":null,"unit":"<u></u>cpm","user_id":3,"value":5672.<u></u>0,"latitude":37.<u></u>419963333333335,"longitude":<u></u>141.03291666666667},{"<u></u>captured_at":"2014-01-30T05:<u></u>00:44Z","device_id":null,"id":<u></u>30981261,"location_name":null,<u></u>"original_id":null,"unit":"<u></u>cpm","user_id":3,"value":5135.<u></u>0,"latitude":37.420035,"<u></u>longitude":141.03309},{"<u></u>captured_at":"2014-01-30T05:<u></u>21:14Z","device_id":null,"id":<u></u>30981506,"location_name":null,<u></u>"original_id":null,"unit":"c<br>
p<br>
m","user_id":3,"value":12164.<u></u>0,"latitude":37.<u></u>42006333333333,"longitude":<u></u>141.03293666666667}]<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5">
<br>
Those do look like legitimate observations, but I don't know if they<br>
comply to the GeoJSON format since I'm new to JSON.<br>
<br>
I'm using this version of GDAL/OGR, which was part of the pre-packaged<br>
binaries for qgis for my Mac:<br>
% ogrinfo --version<br>
GDAL 1.10.1, released 2013/08/26<br>
<br>
Eventually I'd like to use GDAL/OGR to conveniently create a local<br>
spatial database from such a query. However, I need to get over this<br>
hurdle first.<br>
<br>
Cheers,<br>
<br>
Mark<br>
--<br>
</div></div><a href="mailto:mcoletti@gmail.com" target="_blank">mcoletti@gmail.com</a> <mailto:<a href="mailto:mcoletti@gmail.com" target="_blank">mcoletti@gmail.com</a>><br>
<br>
<br>
<br>
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<br><span class="HOEnZb"><font color="#888888">
</font></span></blockquote><span class="HOEnZb"><font color="#888888">
<br>
-- <br>
Sean Gillies<br>
<a href="mailto:sean@mapbox.com" target="_blank">sean@mapbox.com</a><br>
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</font></span></blockquote></div><br><br clear="all"><div><br></div>-- <br><a href="mailto:mcoletti@gmail.com" target="_blank">mcoletti@gmail.com</a><br><div><br></div>
</div>