An open geographic data format based off of JavaScript Object Notation

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18
votes
9answers
16k views

How to convert ArcGIS Server JSON to GeoJSON?

I'm creating a web map using Leaflet, and I want to be able to grab feature layers from our ArcServer. I have successfully been able to retrieve a feature class as JSON, but Esri's JSON objects don't ...
15
votes
4answers
21k views

How to load external geojson file into leaflet map

I would like to load a geoJSON (polygon) file into my leaflet map. I have seen examples where geoJSON is embedded into the javascript code but I can't find any examples showing how it is done with an ...
15
votes
3answers
6k views

Converting SimpleGeo Places GeoJSON file to shapefile?

SimpleGeo has recently made their "Places" data set freely available which is GREAT, because now we can use it for our own purposes, even offline. So I went about downloading the 2GB dataset, which ...
13
votes
4answers
9k views

How to insert a GeoJSON polygon into a PostGIS table?

I need to insert a polygon from GeoJSON to my PostGIS table. This is how the SQL query looks like. INSERT INTO tablename (name, polygon) VALUES ( 'Name', ST_GeomFromGeoJSON ( { ...
28
votes
1answer
7k views

Convert GeoJSON to TopoJSON

Question How do you convert GeoJSON data to TopoJSON? Why Topojson files are often smaller than geojson and the conversion allows you to incrementally simplify a dataset, if you wish.
4
votes
1answer
7k views

How do I get GeoJSON data from GeoServer into show up on my Leaflet map?

I'm trying to create a simple "Green" map for my city. The idea being that it is a website with a map and layers you can turn on and off. I am serving the data through GeoServer and am using GeoJOSN ...
10
votes
1answer
1k views

arcpy.geometry __geo_interface__ and AsShape() function: loss of precision and holes

I'm serializing my arcpy geometries as geojson so that I can 'hydrate' them back as geometries later and I'm having 2 problems in the cycle.: PROBLEM 1: Precision R0 = ...
8
votes
1answer
4k views

leaflet geojson coordinate problem

I just started to play with leflet/geojson a little. But my coordinates are not rendered properly and I have no clue what is going on. My coordinates are: 52.23943, 4.97599. They work correct with ...
14
votes
4answers
6k views

Create Vector Tiles for Polymaps

Ok, likely my bad for not making it to WhereCamp5280 and asking the FortiusOne geeks directly, but what's the process for creating GeoJSON 'tiles' for use in Polymaps? The Population example over at ...
13
votes
1answer
5k views

GeoJson to ESRI Shapefile using ogr2ogr

I have a GeoJson file that I want to convert to ESRI Shapefile using ogr2ogr in FWTools. I tried using ogr2ogr -F "ESRI Shapefile" filename.shp geojsonfile.json OGRGeoJSON I got output ERROR ...
9
votes
2answers
5k views

Generating GeoJSON with Python

Hi I want to programatically create a GeoJSON file using polygons from a shapefile but adding attributes from my own application. This is easily done for a shapefile: def ...
11
votes
1answer
5k views

How to display geoJSON from an URL in a layer?

I am looking for some type of plugin or code which would allow me to add a geojson URL, define the areas to input the lat/long variables from the visible Qgis canvas map and call/render the results ...
3
votes
5answers
864 views

Counting overlapping polygons in GeoJSON to result in new set of polygons?

I have 100 polygons in a GeoJSON file that partially overlap each other. I would like to produce 100 new polygons as follows: The area covered by any of the original 100. This is their union. The ...
15
votes
4answers
8k views

GeoJSON Styling information

As far as I can see there is nothing in the GeoJSON standard to store styling information, i.e. line colours, thicknesses etc. Am I missing something or is this just something that GeoJSON doesn't ...
6
votes
2answers
5k views

Parsing a GeoJSON file with jQuery

I'm trying to iterate through a GeoJSON file (below) and eventually populate an array with a few attributes within "properties". I keep coming up short working through various examples I can find. Do ...
12
votes
3answers
8k views

How to create a GeoJSON that works with D3?

I'm simply trying to convert a .shp file to a geoJSON format using: ogr2ogr -f geoJSON output.json input.shp After executing the command nothing seems to be wrong. Here's an excerpt from the ...
13
votes
2answers
11k views

How to open a GeoJSON file with mixed geometries in QGIS?

If I have a GEOJson file, for example a file named test.js with inside the following: { "type": "FeatureCollection", "features": [ { "type": "Feature", "geometry": {"type": "Point", "coordinates": ...
5
votes
2answers
4k views

GeoJSON java library

I am creating a Java web service that receives GeoJSON. Does anyone know a java library to manage GeoJSON?
1
vote
1answer
570 views

Geopandas/folium map not displaying

I'm trying to use a combination of geopandas, pandas and folium to create a polygon map that I can embed incorporate into a web page. For some reason, it's not displaying and wonder if anyone can ...
4
votes
2answers
1k views

GeoJSON/GeoCouch questions from a newb [duplicate]

I am new to JSON and GeoJSON and would like to start to use this but I am a little confused about some things. Perhaps you can help me out: 1) Is there a GeoJSON validator out there? 2) Is the text ...
3
votes
1answer
1k views

Attribute editing in QGIS on geoJson file

We have vector files in the format of geoJson files. We need to keep it in geoJson format as it is picked up by mobile devices via Restful services. The problem is we want to change the attributes of ...
2
votes
2answers
825 views

How to export thousands of features from PostGIS to a single GeoJSON file?

I know how to export one feature from a PostGIS database using ogr2ogr: $ogr2ogr -f GeoJSON out.json "PG:host=localhost dbname=xxx user=xxx password=xxx" -sql 'select id, county, wkb_geometry from ...
2
votes
1answer
2k views

How to get correct format of coordinates for export to geojson from QGIS?

I've created a custom map in QGIS with a few shapefiles. I'm using leaflet.js to render the map and the shapefile points and everything lines up correctly. The CRS is set to 4326. When I export the ...
1
vote
2answers
2k views

Convert shapely polygon coordinates

I am trying to work with a shapefile using shapely, fiona and python. The original coordinate system is in latitude and longitude that I am trying to convert to state plane system. So I want an ...
1
vote
1answer
3k views

How can I add an infowindow to an OpenLayers GeoJSON layer?

In my OpenLayers script I refer to an geojson layer. Is it possible to add an info window?If yes, how can I create this. Script is as follows: var lon = 5, lat = 52, zoom = 7, epsg4326 = ...
1
vote
2answers
6k views

How to get GeoJSON features using OpenLayers?

Can anybody explain how to get geojson features .Can somebody show way to get attributes from geojson text. OpenLayers.ProxyHost = "/gt/proxy.cgi?url="; var lon = 5; var lat = 44; var ...
7
votes
1answer
433 views

Python3 libraries for GIS analysis

I am trying to do some spatial data analysis in Python 3 now, and I was wondering what the best libraries are for GIS in Python 3. The Fiona library was developed with Python 3.3 but the Python 3+ ...
4
votes
1answer
304 views

Day and night zone layer for Leaflet

I'm working with Leaflet and I'd like to show the day and night zones adding a dynamic layer to my map. I was thinking to add a static layer with some transparency and make it move every x minutes but ...
3
votes
4answers
5k views

How to convert SHP to GPX or to JSON?

I would like to convert the tree inventory shape files of London (Canada) into a GPX file and if possible into a JSON file. You can download the archive from their Open Data website. It contains the ...
2
votes
0answers
33 views

How to make a network /tower coverage map in in mapbox

I am new to mapping and currently I am trying to make a map showing coverage of a network provider here in my country. The map I am trying to achieve should look similiar to that at ...
2
votes
1answer
196 views

SQLServer Shapefile Export won't load in MongoDB due to self intersection

I am having an issue loading a handful of GeoJSON files that were created from a shapefile export from SQLServer into MongoDB. This polygon will not load in MongoDB because of two duplicate vertices ...
2
votes
1answer
1k views

Convert GeoJSON with multiple Polygons and MultiPolygons into single MultiPolygon?

Is this even possible? I have a GeoJSON file with multiple polygons and multipolygons, and I need to set styling on them (in Leaflet.js). I'd like to create a single, large MultiPolygon from the ...
2
votes
2answers
721 views

export map state as JSON: Web_Map_as_JSON

Is there a way to export the current map state as a JSON object, mostly named Web_Map_as_JSON. The JSON specification should be like this. In other words, it would be convenient to have a function ...
1
vote
1answer
323 views

Openlayers: select a feature programmatically from GeoJson

I am working on a project that uses openlayers (version2.14)to display a Bing layer(GeoJSON format), I have no problem reading the GeoJSON and display features, but I want to select a feature ...
0
votes
1answer
625 views

Reproject GeoJSON from EPSG:3857 to EPSG:4326

I am using this reproject tool to convert a GeoJSON point from EPSG:3857 to EPSG:4326. My command fails. What am I doing wrong? $ echo ...
13
votes
1answer
2k views

What is topojson and how is it different than geojson?

This is a conceptual question. What are the differences between these? and what are the pros and cons of these formats?
15
votes
3answers
10k views

ogr2ogr converting to shapefile - how to select feature types?

Shapefiles can only have one geometry type, but many other formats (kml, geojson) can have multiple types. When converting to shapefiles, is it possible to to tell ogr2ogr to create multiple ...
7
votes
1answer
8k views

problem adding pop-up to GeoJSON layer in Leaflet

I'm new to working with the Leaflet API and am running into trouble with creating popups for a GeoJSON layer. I've looked at the following post as a reference and am still having difficulty: binding ...
7
votes
3answers
2k views

Advantages of WFS over GeoJSON/KML?

I'm planning to create an online map with openlayers (2 or 3) or leaflet. I have to show some points/markers (~30.000), polygons (~500) and lines on top of an OSM map in several layers. Those points ...
12
votes
2answers
5k views

How to Export Feature GeoJSON from PostGIS

I'd like to do a GeoJSON dump of a PostGIS table, but I want to export features (the geometry and the properties) not just the geometry. I've been digging into the ST_AsGeoJSON function but it looks ...
10
votes
1answer
8k views

What is the default projection in Leaflet?

I've read an API documentation for Leaflet on its site, but I can't realize: what is a default projection to view maps? It was written about spherical and elliptical Mercator and Equirectangular - so ...
3
votes
1answer
2k views

Which plugin can draw topoJson right within Leaflet without conversion?

I already have asked how to reduce file size and increase performance for publishing spatial data on the web using Leaflet, here. A conversion to TopoJSON has reduced the file size by approximately ...
3
votes
3answers
3k views

How to add a polygon from PostGIS ST_AsGeoJSON into Leaflet?

I try to use the following function to add polygons to my Leaflet map. function polygon(geojson) { alert(geojson); // alert for testing layer = L.geoJson(geojson); layer.addTo(map); } ...
10
votes
3answers
5k views

How to Validate a GeoJSON

I have a small script that I'm using to generate GeoJSON data from a data format not currently supported by GIS software. I would like to validate the output, but when I use ogr2ogr to read it, it ...
4
votes
1answer
2k views

Geoserver WFS - Can I Pass in Filter Parameters via the URL?

I'm trying to use PHP's CURL function to fetch geoJSON information from a GeoServer instance. I'm doing this using url variables rather than trying to construct a full xml GetFeature request. ...
3
votes
1answer
1k views

OpenLayers GeoJSON Data Store

Background: I have a single geoJSON data object that backs multiple Vector Layers of its features. I do this because the feature data has many attributes and can be presented in many different ways, ...
2
votes
2answers
694 views

What's the best way to determine if a point is within a certain distance of a GEOJSON polygon?

What's the best way to determine if a point is within a certain distance of a GEOJSON polygon? Should one use TurfJS buffer method (https://github.com/Turfjs/turf-buffer#turf-buffer)? Can one perform ...
2
votes
2answers
2k views

Leaflet.geojson webpage performance out of hand, how to convert to .png?

I exported some countries as a single .geojson file. The file includes every country's vertices and coordinates, as that's what a .geojson is ─ a vector file. Thing is, there are about 20 countries ...
2
votes
1answer
4k views

Integrate GeoJSON file with openlayers.protocol.http

I've got a problem with (the title says it) integrating a geojson file in my openlayers map. I have to use the openlayers.protocol.http way. I examined lots of examples on the web (and on ...
1
vote
1answer
609 views

Submit a form from within a leaflet popup?

I want to submit a form from within a leaflet popup simply using javascript and geojson. I am essentially collecting attribute information in the form and then I want to process the information into ...