On Thu, Nov 6, 2014 at 3:54 PM, Arighna <[email protected]> wrote:
> I am not sure how I can load multiple data in the same map. Putting > everything in the same json file does not work. Also, using an existing map > for loading a new json file does not work. > > Import individual JSON files separately and then patch (merge) them using v.patch. http://grass.osgeo.org/grass70/manuals/v.patch.html > -----Original Message----- > From: Arighna [mailto:[email protected]] > Sent: Wednesday, October 22, 2014 1:52 PM > To: 'Moritz Lennert' > Cc: [email protected]; 'Vaclav Petras' > Subject: RE: [GRASS-user] Loading JSON data in GRASS > > > Awesome man. It worked now. Thanks a ton Moritz. > > Arighna > > -----Original Message----- > From: Moritz Lennert [mailto:[email protected]] > Sent: Wednesday, October 22, 2014 7:16 AM > To: Arighna; 'Vaclav Petras' > Cc: [email protected] > Subject: Re: [GRASS-user] Loading JSON data in GRASS > > On 21/10/14 04:38, Arighna wrote: > > Hi Vaclav, > > > > I have loaded the point in GRASS. But the attributes are not loaded > > successfully. I am posting one sample data. Could you please help me > > finding what is wrong with the data. Or maybe I am going wrong with > > the loading process. > > This sample data is not enough. According to the ogr GeoJSON format manual > [1], "according to the GeoJSON Specification, only the Feature object must > have a member with name properties. Each and every member of properties is > translated to OGR object of type of OGRField and added to corresponding > OGRFeature object." > > In other words: attributes have to be members of the member properties of > the Feature object. > > I can get a bit further in importing your attributes by using the following > at the beginning > > {"type": "Feature", > "geometry": > { > > "type": "Point", > > "coordinates": [50.922759,-90.089954] }, > > "properties": > > { > > "air_temp":{"unit":"F","value":32.0}, > > [then the rest is identical to JSON code]. > > However, this imports the attributes as such (example is air_temp): > > { "unit": "F", "value": 32.0 } > > If I change the JSON to > > "properties": > > { > > "air_temp":32.0, > > etc > > I get the expected attribute values, i.e. air_temp is 32.0 which is > recognized as double precision in the attribute table. > > To check quickly how ogr parses the attributes, you can check on the > command > line with > > ogrinfo point.json OGRGeoJSON > > Moritz > > [1] http://www.gdal.org/drv_geojson.html > > >
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