How to read geojson data?

Core Library Questions

oatcracker

in Core Library Questions • 19 days ago

Hi, is there a standard library to process Geojson data in processing such as the data for Urban Data Challenge :
https://github.com/swissnexSF/Urban-Data-Challenge/tree/master/public-transportation/zurich/geo

The geojson data is like:

{
"type": "FeatureCollection",
"features": [
{ "type": "Feature", "properties": { "stopId": 2735, "stopNumber": 4, "stopNameShort": "ZOOF", "stopName": "Zürich, Zoo\/Forrenweid" }, "geometry": { "type": "Point", "coordinates": [ 8.577939444444439, 47.380353055555602 ] } }
,
{ "type": "Feature", "properties": { "stopId": 2735, "stopNumber": 4, "stopNameShort": "ZOOF", "stopName": "Zürich, Zoo\/Forrenweid" }, "geometry": { "type": "Point", "coordinates": [ 8.57826333333333, 47.3806377777778 ] } }
,
{ "type": "Feature", "properties": { "stopId": 2375, "stopNumber": 2814, "stopNameShort": "WALD", "stopName": "Zürich, Waldgarten" }, "geometry": { "type": "Point", "coordinates": [ 8.557161666666669, 47.403754444444402 ] } }
]
}

Thanks!

Replies(7)

oatcracker

Re: How to read geojson data?

19 days ago

figure out how to extract the information:

JSONArray jArray;
void setup() {
jArray = loadJSONArray("stops_copy.json" );
println(jArray.getJSONObject(0));
println(jArray.size());
println(jArray.getJSONObject(0).getString("type"));
println(jArray.getJSONObject(0).getJSONObject("properties").getString("stopName"));
}

Chrisir

Re: How to read geojson data?

19 days ago

in the libs section there is a kml data / gps lib

Greetings, Chrisir

oatcracker

Re: Re: How to read geojson data?

19 days ago

Hi, chrisir, i can't find the lib for kml/gps on the processing lib website ...

oatcracker

Re: How to read geojson data?

19 days ago

update on the code:

JSONObject stopsJSON;
JSONArray stops;
void setup() {
stopsJSON = loadJSONObject("stops.json");
stops = stopsJSON.getJSONArray("features");
//println(stops.size());
for (int i = 0; i < stops.size(); i++) {
int stopId = stops.getJSONObject(i).getJSONObject("properties").getInt("stopId");
int stopNumber = stops.getJSONObject(i).getJSONObject("properties").getInt("stopNumber");
String stopName = stops.getJSONObject(i).getJSONObject("properties").getString("stopName");
String stopName_short = stops.getJSONObject(i).getJSONObject("properties").getString("stopNameShort");
double stop_longitude = stops.getJSONObject(i).getJSONObject("geometry").getJSONArray("coordinates").getDouble(0);
double stop_latitude = stops.getJSONObject(i).getJSONObject("geometry").getJSONArray("coordinates").getDouble(1);
println("_________________________");
println("stopId: " + stopId);
println("stopNumber: " + stopNumber);
println("stopName: " + stopName);
println("stopName_short: " + stopName_short);
println("stop_longitude: " + stop_longitude);
println("stop_latitude: " + stop_latitude);
}
}

Chrisir

Re: How to read geojson data?

19 days ago

http://www.reades.com/MapThing/ Greetings, Chrisir If you need an answer, please send me a personal message since this forum doesn't notify.

Chrisir

Re: How to read geojson data?

19 days ago

http://www.processing.org/reference/libraries/#data Greetings, Chrisir If you need an answer, please send me a personal message since this forum doesn't notify.

dimiro

Re: How to read geojson data?

19 days ago

oatcracker
you actually read the data :)..

are they going to update their data? they do not have polygons