An open geographic data format based off of JavaScript Object Notation

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3
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1answer
325 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
364 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
289 views

Folium GeoJSON Overlay Not Appearing

I am in the midst of a task which involves the clustering of assessment neighborhoods into larger neighborhoods (data link). The goal is build these neighborhoods in a manner consistent with major ...
2
votes
1answer
114 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
49 views

Routing api help (MapBox or similar)

i have a geoJSON objects and i want to route between waypoints on my geoJSON file. this is my example geojson file. { "type":"FeatureCollection", "generator":"JOSM", "bbox":[ ...
1
vote
1answer
29 views

Assign points with varying radii to central meeting locations

I have a set of points in a city, each with a maximum distance radius of 0.5 - 1.5 miles. From this set of points, I'd like to create a small number of 'meeting points', i.e. locations that are ...
1
vote
1answer
46 views

How to add GeoJSON layer with GraphHopper?

I have a GeoJSON file containing some POI that I would like to be able to display within a separate layer with GraphHopper. But after several tries and search over internet, i can't manage to get a ...
1
vote
1answer
22 views

QGIS geojson vector layer

When I add vector layer to QGIS using geojson protocol, data form server are being displayed. Problem is that every change of map extent (pan, zoomIn, ZomOut) is causing request for same data again. ...
1
vote
1answer
55 views

How do I make my map use a set of coordinates

Right a little background. I've made a custom google map with the google map api which has a few functions that work well within it - one specifically is limiting the user on what they can view within ...
1
vote
1answer
100 views

Is there a way to have a choropleth map in Excel reading data from a sheet?

Is it possible to have a solution similar to ESRI maps for office in which I want basically a geojson file or any file for that matters to render a choropleth map based on data in a sheet? Tried ...
1
vote
1answer
62 views

Unable to save to in Geojson format with the correct projection

I have a shape file (Polygon) in Qgis that I wish to save in Geojson in order to display it with the mapbox javascript api. Original projection is in POSGAR 97 My issue is that it does not reproject ...
1
vote
0answers
142 views

How to show an array of 2d points/polygons in Polymaps (Cartesian coordinate system)

I need to display these 2d points/polygons (Cartesian coordinate system) on Polymaps with GeoJson layer. I do not use the other layers. Do I need to convert xy coordinates to the lat lon? If so, how? ...
0
votes
0answers
10 views

OpenLayers 3 serverVector making multiple GET requests

I am loading a vector layer by modifying the example in http://acanimal.github.io/thebookofopenlayers3/chapter03_07_query_wfs.html. I am using a cql_filter to determine what features are returned by ...
0
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0answers
17 views

OpenLayers3 Heatmap: Which are the availables geotypes to load?

I'm developing a heatmap and I'm trying some of the availables libraries. Leaflet GoogleMaps OpenLayers I'm using a geoJson file with several amounts of points. Since Leaflet allow me to assing a ...
0
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0answers
9 views

On load event for Leaflet proj4leaflet projected geoJSON layer

Can't find proper event for vector layer like on "load", to be fired when this layer is fuly rendered. I add vector features to a layer in Leaflet using proj4leaflet from JSON object like this var ...
0
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0answers
40 views

Fetching postgis data through php json and passing to leaflet map

I am new to this and trying to explore leaflet and geojson a bit. Please help me with this. This is my php page which I am using to fetch data from PostGIS. (the data opened successfully in the ...
0
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0answers
12 views

what properies i need to hold in waypoints array

im trying to build my own direction api but that is new for me and im trying to resolve a puzzle here, so my question is, what properies i need to hold in waypoints array ? { ...
0
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0answers
34 views

Convert GeoTIFF Raster to JSON?

So I need to convert raster data to JSON format. Is the best way to do this to convert the XML files associated with the rasters to JSON? ARC Map has a tool to convert vectors to JSON, but not ...
0
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0answers
38 views

Error while passing geojson data to leaflet heatmap

I am using following set of code for converting geoJson data into Heatmap format and passing to L.heatLayer extends of leaflet. While using this function to fetch the data...I get this following ...
0
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0answers
23 views

How to remove all active layers or to know all active layers in leaflet?

I just need to know if there is any function which helps to return all active layers. basically, I need this function to remove all layers due to my ajax call. Here is my main function ... function ...
0
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0answers
28 views

Leaflet filtering existing featuregroup

I have a leftleat map and i would like to filter the featuregroup i am displaying. exp_colJSON = new L.geoJson(exp_col,{ onEachFeature: pop_col, pointToLayer: function (feature, latlng) { ...
0
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0answers
84 views

Appropriate number decimals for storing 20m resolutuion US county data in GeoJSON

I took the 20M the 2013 census bureau data and converted it to GeoJSON. I also used this Ramer-Douglas-Peucker implementation to reduce the point count and therefore number of points with an epsilon ...
0
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0answers
20 views

Printing GeoJSON layer

I am trying to print a GeoJSON layer that I create myself programatically. The way that I am using is the following: var style = { externalGraphic: "images/drop.png", graphicOpacity: 1, ...
0
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0answers
18 views

ogr2ogr in java gdal

I would like to code ogr2ogr -f "GeoJSON" destination.geojson source.geojson -s_srs EPSG:3068 -t_srs EPSG:4326 in java-gdal. I tried to understand how it should work by looking at this example but ...
0
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0answers
47 views

OL3 error with Style function

I am trying to style a .json layer with a numbe of classes based on an attribute. I and getting the error below which is apparently in ol3.js based on debugging in chrome: Uncaught TypeError: ...
0
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0answers
25 views

increase gdal_polygonize's capacity

I have a very big PNG (82500x40900) with more than 5000 polygons. I want to use gdal_polygonize but the geojson output shows that gdal_polygonizer stopped after 4770 polygons and the geojson isn't ...
0
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0answers
12 views

Deviated InfoBox - Geojson

I tried to showing info-Box after click (onmouseclick), that is goes well but info-Box's location is far away from my geojson area. Can Someone explain to me what happen in here?
0
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0answers
42 views

error converting shapefile to geoJSON with Ogre online tool

I am using on online tool built with ogr2ogr to convert shapefiles to geoJSON: http://ogre.adc4gis.com/ It's worked well except for one shapefile, and I can't see why... The shapefile has only six ...
0
votes
0answers
127 views

GeoJSON and php i cant visualy roads from postgres database

I am make a json file with geometry MultiLineString from the posgresql but when i try to load the file in map.data.loadGeoJsonis not visually the roads but if i take the link from google api example ...
0
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0answers
95 views

Get Linestring and Polygon into Leaflet from GeoServer

I can load points from my geoserver to leaflet via jsonp. Now I would like to know how can I load linestring or polygon with similar method into leaflet. Here is the example for points: var ...
0
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0answers
137 views

GeoJson layers with leaflet in IE8

I have built a website displaying a lot of line shapes, using geojson, on a leaflet map. This is working relatively well in most browsers, though speed could be improved. As usual IE8 is being the ...
0
votes
0answers
62 views

geojson object with different representations and label/popoup conten

I have a quite complex geojson in terms of vertexes. It holds all the information which is needed in the webmap. it serves as the input for many layers like this (example for two): var represenation1 ...
0
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0answers
81 views

How to hide overlays in Leaflet layerControl if geojson var not found?

i would like to perform a specific task: i have a set of geojson layers, loading features from local files. i have the layercontrol on the map showing available layers to show/hide now, regarding ...
0
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0answers
403 views

openlayers 3 geojson style

here's a part of my html/js file. I cant display my geojson and really dont know the reason why. debug only says : "TypeError: f is null" any1 help ? Thx var map = new ol.Map({ target :'map', layers: ...
0
votes
0answers
122 views

OpenLayers Vector Features with common properties in multiple Layers

I am trying to manage features across different layers. Features are displaying weather parameters at some points on the map. Hence there is a wind layer, a temperature layer, etc. which all are ...
0
votes
0answers
158 views

Geojson not rendered with Mapnik

I am trying to generate a tile with Mapnik with a GeoJSON. The stylesheet.xml with the part to render the GeoJSON is the following: <Style name="cities" filter-mode="first"> <Rule> ...
0
votes
0answers
47 views

How to serialize a HTML form to GeoJSON data?

I'm developing a Cordova/PhoneGap mobile application and using NodeJS for server and MongoDB as database. I need to serialize GPS data from mobile phone to send it to my webservice with latitude and ...
0
votes
0answers
89 views

Google Maps + Geojson vector layers --> Save as Image

I've created a custom website with Google Map's + geojson layers read from a Postgis database. I draw some other layers on top of it, including some polygon and line layers... I display this website ...
0
votes
0answers
66 views

OpenLayers GeoJson style

I have a GeoJson that I'm displaying in OpenLayers. I created a style map and added it to a layer. The problem is that in GeoJSON I have two types of features - Points and Linestring. And they both ...
0
votes
0answers
61 views

GeoJSON layer with local projection in Leaflet

I try to add a GeoJSON layer to my map in Lambert II projection. The GeoJSON contains few points. It don't work if the GeoJSON have more than 1 feature, but for 1 feature, it work ! I don't know why ...
0
votes
0answers
131 views

TileStache : Unknown geometry type in geoJSON file

I'm currently trying to set up a TilSstache server on Ubuntu 12.04 to serve some GeoJSON tiles from a shapefile/JSON file (administratives boundaries) for a web mapping project using the Leaflet ...
0
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0answers
24 views

From NBM to UWN

Okay, I'll start this off by saying that I'm not a GIS expert by any means. I'm also working with data and places that most people don't work with, but I'm hoping it can be boiled down to basics. I've ...
0
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0answers
645 views

D3.js with dynamic geojson data (SQL server/.NET)

I have a $.ajax function which returns the geojson data from the asp.net mvc server method. I want to know how I could send that as a parameter to d3.json() function. Better if anyone shared code ...
0
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0answers
335 views

D3.js with dynamic geojson data

I have a $.ajax function which returns the geojson data from the asp.net mvc server method. I want to know how I could send that as a parameter to d3.json() function. Better if anyone shared code ...
0
votes
0answers
373 views

Using Tile Mill and GeoJSON

I am trying to use Tile Mill and GeoJSON layers to have an image appear within a tooltip but it is not working properly. The process I go through to get the GeoJSON: 1) load .shp into QGIS 2) save ...
0
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0answers
275 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
169 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
372 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
176 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
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0answers
93 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 ...