An open geographic data format based off of JavaScript Object Notation

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3
votes
2answers
409 views

Offline Phonegap/Openlayers App

I have a mobile app that uses Phonegap with OpenLayers and Geoserver. Now, I need to make the app available completely offline. The amount of data points can get very large depending on what client is ...
2
votes
2answers
131 views

json to xml transformation with x2js

I am trying to transform a JSON object to XML, but i have somehow get stuck in jscript (not an expert). Here is the code: ... var GEOJSON_PARSER = new OpenLayers.Format.GeoJSON(); var ...
1
vote
2answers
135 views

Printing possible for openlayers GeoJson WFS with Mapfish printing service and wkhtmltopdf?

I searched lots of places but i couldn't find proper examples or documentation to do printing using Mapfish Printing service or Wkhtmltopdf. My application got few WFS layers from openlayers and ...
1
vote
2answers
1k views

How to project pixel coordinates in leaflet?

I am trying to create a map based on an image which is 16384x16384 px, but I would also like to add markers at specific locations using pixel coordinates of this given image. I created a tile layer, ...
1
vote
2answers
304 views

Polygon intersection with bounding box with polygon's holes intact

I am trying to serve GeoJSON FeatureCollection tiles with each feature's geometries trimmed to the tile boundary. I am working on a Leaflet plugin to re-assemble the geometries. It works by building ...
0
votes
2answers
711 views

How do I modify features during runtime, in a GeoJSON feature group on Leaflet?

I have added some GeoJSON to my Leaflet powered map as below. (Altered version) var array_of_layers = L.layerGroup([]); var styleholder = []; var belgium_style = {color: "#d3e46f"}; var bosnia_style ...
0
votes
2answers
282 views

PHP PostGIS to geoJSON missing required parametar error

I'm using this PHP PostGIS to geoJSON script: https://gist.github.com/bmcbride/1913855 But I keep getting this error: 'missing required parameter: geotable' This is my code: # Retrive URL ...
6
votes
1answer
62 views

Suitable algorithms for simplifying isochrone polygons

I'm looking for an algorithm for simplifying isochrones which were generated using OSM data. These are generally characterised as having lots of small "holes" mostly due to missing OSM data but also ...
5
votes
1answer
429 views

Generate tiles for google maps overlays

I am trying to show some information on Google Maps which would be in the form of translucent circle overlays. The problem is that some circles overlap, which results in increased opacity and blending ...
2
votes
1answer
157 views

Large loads geojson from mysql to leaflet?

I have a mysql database with +25K rows including geometry and other attributes. Using a mysql2geojson php script I then added it to a leaflet map. It is super slow now, what can I do to boost the ...
2
votes
1answer
143 views

How to get data from TileMill tileLayer properties in Mapbox for click/hover

I've successfully used Leaflet to load a geoJSON polygon-shapefile with data, and added click and hover interactivity to the layer. For a large dataset, I switched to mapbox.js 1.6.1, used TileMill to ...
2
votes
1answer
125 views

Natural Earth: How to get the position of all provinces that belong to a state

This question is about Natural earth 1:10 states and provinces.shp file. I'm using ogr2ogr and want to know the name of the id i need to pass . In purpose of pulling out the right states regions. ...
2
votes
1answer
228 views

leaflet geojson contextmenu

I want to add a context menu on right click for various elements on my geojson layer (I'm doing a road map so on a right click on the road at any part I want to show the context menu). I've managed ...
2
votes
1answer
109 views

how to see multiple features from GeoJSON

In Pablo's answer: Open a GeoJSON file with QGis He says he 'imported each type at a time'. How do you do that? I am working with a GeoJSON file that has a mixture of points and polygons, but points ...
1
vote
1answer
44 views

SQL-query should return GeoJSON FeatureCollection

I'm trying to return a GeoJSON FeatureCollection object from a SQL-query with PostgreSQL 9.3 and PostGIS 2.1. This is my query so far: SELECT row_to_json(fc) AS p FROM (SELECT 'FeatureCollection' ...
1
vote
1answer
270 views

How to export a geojson file with correct order of coordinates?

I was testing rendering of data via GitHub in geojson format, because I wanted to use it for INSPIRE data. INSPIRE data are in GML 3.2.1 format. I've downloaded one of datasets from ...
1
vote
1answer
198 views

How to write GML and GeoJSON features while retaining attributes in .NET?

I am developing a .NET project [C#] that needs to export/write features as GML and GeoJSON, including, of course, the attributes; data could queried by a database or manually entered. I checked ...
0
votes
1answer
44 views

Openlayers 3 display in Firefox and Chrome

I'm experiencing some issues with displaying OSM and GeoJSON. With Firefox v30 I see my GeoJSON data, but OSM is invisible. With Chrome v35 I see OSM, not my GeoJSON... What is the explanation? ...
0
votes
1answer
11 views

Guideline/scheme for naming properties in GeoJSON

Are there any guidelines/requirements for naming properties in GeoJSON? Should I add a vendor-prefix for my properties which only make in use with a specific application? I already read the ...
0
votes
1answer
39 views

Adding points from JSON to ArcGIS for Android?

I am new to Android, the ArcGIS Platform and ArcGIS for Android. I need to load points (offline) from a JSON file (GeoJSON) onto the map which displays a local Tile Package (*.tpk) and shapefile.
0
votes
1answer
31 views

TileMill OGR Plugin: Failed to read GeoJSON data

I'm trying to load the following into a TileMill layer as the file build1.geojson { "type": "Feature", "geometry": { "type": "Polygon", "coordinates": [[ ...
0
votes
1answer
53 views

Getting coordinates to create geojson

I have a geotiff that I have been working with in tilemill and I would like to select portions (buildings) in the map and create new layers as geojson objects. My issue is I don't know how to get the ...
0
votes
1answer
44 views

Filter geojson or shapefiles

I'm trying to create a geojson file with a few shapes of roads from OSM. Now, I've been able to get shapefiles of the greater region (province) these roads are in from http://download.geofabrik.de/ . ...
0
votes
1answer
263 views

Read GeoJSON with openlayers

I generated a GeoJSON a projected table in EPSG: 4326 domeu postgis SELECT ST_AsGeoJSON(geom) FROM "onibus" I put in the www folder on my server I'm running geoserver locally my pages are also in ...
0
votes
1answer
98 views

How to compute and add the bounding box for every feature in a given geojson file

I have a geojson file. I need to find the bounding box of every feature in the geojson, then find the intersections between any two bounding boxes. I am using leaflet and Angular to display the ...
0
votes
1answer
176 views

Issue with a point insertion into a Geoserver points layer. WFS-T

How is the best way to insert a feature from the client side into an existing GeoServer layer? Maybe using an ajax call and JSONP? Or OpenLayers (i can't figure out how to have the proxy working)? ...
0
votes
1answer
82 views

ogr2ogr GeoJSON GeometryCollection

All, I have a Postgres/PostGIS DB with two geometries in a single table. I want to export them as a GeoJSON GeometryCollection (see here) but I can't seem to get the GEOMETRY_AS_COLLECTION layer ...
0
votes
1answer
41 views

Make hangs when attempting to build zip code TopJSON file on Mac OS X

Thanks so much to all involved with the us-atlas project. I am learning how to use d3, leaflet and other tools to make maps and this is really helpful. I have grabbed files from the us-atlas project ...
0
votes
1answer
67 views

VSI File API support in ogr2ogr

It seems that support for streaming input is wishy-washy in ogr2ogr. For example, why can I do this: curl "http://data.usgin.org/arizona/wfs?service=WFS&version=1.1.0& ...
-2
votes
1answer
60 views

Render specific vector data from database with openlayer

I want to render some data on a map. They are stored as points in my database (postGiS), each one is associated with a name. I want to render points with the same place name in the same color. ...
0
votes
0answers
183 views

Why do my maps exported in WGS84 have large coordinates?

I'm using QGIS to export map layers as GeoJSON for use in Leaflet. The map file CRS is WGS84(EPSG4326) and I'm exporting it as such. The issue is the exported coordinates are still too large: [ ...
0
votes
0answers
113 views

getting a geoJSON string using pgrouting and path drawing in an Android application

Currently I am working on a project that displays a route in an Android application. I have configured pgrouting 1.5 workshop and it's working fine using a web browser. In order to draw the path in ...
0
votes
0answers
124 views

saveStrategy and OpenLayers

I am trying to apply code mainly from here http://maps.peterrobins.co.uk/files/ol6.html and create a custom "saving button". Problem is, that my json is loaded (from mysql db) to variable. (This time ...
0
votes
0answers
69 views

Is “here maps javascript api” supporting GeoJSON or any file format alternative to KML

Is it possible to load GeoJson formatted data into here maps js api in a proper way? I am using AJAX to send data coming from mysql which is formatted in GeoJSON. I don't want to store any kml files.
0
votes
0answers
256 views

Continents geometry data / extracting contours of continents from country geometry

I have an ESRI Shapefile data from Natural Earth (Admin-0 Countries). I converted it to geoJSON format. There is no world or continents geometry there, only the county one. And I'd like to extract eg. ...
0
votes
0answers
139 views

Openlayer seems slow when zooming / panning on vector (geometry line) from geojson. Why?

I have a layer with 7 lines . when I zoom on some of the lines , the maps seems to be very slow. I thought it might be because I bring a lot of points to the client (that represents the line) aa ...
0
votes
0answers
83 views

Is there a big (if any) performance difference between Geoserver SQL Layer and OpenLayers geojson Layer?

I have a table with multiline geography items in SQL Server 2008 (Routes). I want to show them on OL Google Map but I'm having trouble creating SQL Data source in geoserver (something related to ...
0
votes
0answers
457 views

How do I add elevation data to a GeoJSON line from a GPX file?

I understand that elevation can be added as an optional third value in Coordinates (lat, long, elev) in a geojson file, but I can't find a way to actually do that from a gpx file. I've used ogr2ogr to ...