hey Jukka,
just found out what the issue with the data types is. you ogr2ogr samples were
improper, at least for (Long & Boolean) ;(. see
{ "type": "Feature", "properties": { "City": "South Dakota", "A_Date":
"2016\/06\/23 17:02:25.138+03", "B_Integer": 71520, "C_Double": 79522.019838,
"D_Long": "207345226552", "E_Boolean": "true", "F_Code": null, ... }
should be
{ "type": "Feature", "properties": { "City": "South Dakota", "A_Date":
"2016\/06\/23 17:02:25.138+03", "B_Integer": 71520, "C_Double": 79522.019838,
"D_Long": 207345226552, "E_Boolean": true, "F_Code": null, ... }
note the missing " for both data types. generally " indicates a string in json.
good news though in general - generic attribute type support (String, Long,
Double, Boolean)for OJs GeoJSON reader is coming up.
..ede
On 03.07.2016 14:11, Rahkonen Jukka (MML) wrote:
> Hi Ede,
>
> I made a very short test which was successful. I can't do more tests before
> July 11. Meanwhile I encourage everybody else to test with all kind of
> GeoJSON files from various places. Especially different web services
> delivering data as GeoJSON are interesting because we could later make
> OpenJUMP as a client for such services.
>
> -Jukka Rahkonen-
>
> edgar soldin wrote
>
>> hey Jukka,
>
>> please try r4945 or later.
>
> ..ede
>
> On 27.06.2016 11:47, Rahkonen Jukka (MML) wrote:
>> Yes, sure, having all as strings is a good start.
>>
>>
>> -Jukka-
>>
>> edgar soldin wrote:
>>
>>> Jukka,
>>
>>> could you live with all attributes being read as Strings for now?
>>> ..ede
>>
>> On 27.06.2016 08:35, Jukka Rahkonen wrote:
>>>> Hi,
>>>>
>>>> Json datatypes http://www.tutorialspoint.com/json/json_data_types.htm do
>>>> not map perfectly with OJ datatypes. Strings can be separated from
>>>> numbers, though, but there is another problem in missing schema. Each
>>>> feature can have different attributes.
>>>>
>>>> I believe that GDAL is scanning the GeoJSON file twice for finding all the
>>>> attributes which appear in the data and analyzing their datatypes. Rather
>>>> often GeoJSON is converted from GIS data and then schema is fixed so that
>>>> all features have same set of attributes and empty ones are marked as
>>>> NULL. Still it is hard to know the type of attribute if it is NULL.
>>>>
>>>> Code for reading GeoJSON with GeoTools is at
>>>> https://github.com/geotools/geotools/tree/master/modules/unsupported
>>>> /g
>>>> eojson
>>>>
>>>> An easy start could be to read the first one feature and build
>>>> schema with attribute types double, string, boolean. But what to do
>>>> if there are null values? Read first hundred? Read until first not
>>>> null? Or let user make a header line with schema into a separate
>>>> file "basename.jsont" like with the GDAL CSV driver
>>>> http://www.gdal.org/drv_csv.html
>>>>
>>>> attr_1:string;attr_2:integer;attr_3:double
>>>>
>>>> Sorry that I can't give simple answers, I thought it would be easier and
>>>> handled by JTS already.
>>>>
>>>> -Jukka-
>>>>
>>>> edgar.sol...@web.de kirjoitti 2016-06-26 17:19:
>>>>> hey Jukka,
>>>>>
>>>>> attributes do not seem to carry a type in GeoJSON.. any idea how
>>>>> this is supposed to be parsed?
>>>>>
>>>>> ..ede
>>>>>
>>>>> On 23.06.2016 16:20, Jukka Rahkonen wrote:
>>>>>> Hi Ede,
>>>>>>
>>>>>> Please find attached. I included some small samples in both JML and
>>>>>> GeoJSON. For the conversion I used ogr2ogr:
>>>>>>
>>>>>> ogr2ogr -f geojson output.json input.jml
>>>>>>
>>>>>> Test data is not perfect:
>>>>>>
>>>>>> - I just digitized some features and they may be outside the real
>>>>>> area of the EPSG:4326 which is default in GeoJSON
>>>>>> (-90,-180,90,180)
>>>>>> - GDAL warned that DateTime type is not natively supported
>>>>>>
>>>>>> For handling projections with ogr2ogr use source and target srs
>>>>>> parameters as
>>>>>>
>>>>>> ogr2ogr -f geojson -s_srs epsg:3067 -t_srs epsg:4326 output.json
>>>>>> input.jml
>>>>>>
>>>>>> -Jukka-
>>>>>>
>>>>>> edgar.sol...@web.de kirjoitti 2016-06-23 15:56:
>>>>>>> Jukka,
>>>>>>>
>>>>>>> do you have an example dataset to tiner with for me?
>>>>>>>
>>>>>>> ..ede
>>
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