An open geographic data format based off of JavaScript Object Notation

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64 views

How widely supported are nested FeatureCollections in GeoJSON?

I know that FeatureCollections inside FeatureCollections are not supported according to the GeoJSON spec, but I have seen multiple implementations that do support it. Are nested feature collections ...
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153 views

Merge multiple geojson-polygons

Lets say I have a very big image With a polygon in it: I want to polygonize this very big image with gdal polygonize. But the image is too big, so I dont have enough memory to polygonize that ...
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223 views

create image out of geojson (gdal_rasterize?)

Short version: I need to know how I can convert a .geojson-file to an according .png-file (or any other image format) long version: I have a .geojson which was created by gdal_polygonize from a .png ...
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211 views

Global POI database in JSON format?

Does anyone knows if there is a flat file database of points of interest in a json format somewhere available for download? If not how would one set off to create such a database? Are there any tools ...
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44 views

combine multiple geojsons

I have several geojsons which contain polygons. But the polygons are reaching over other geojsons. When I import them into lets say Qgis, the polygons, which are distributed among several geojsons are ...
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187 views

Saving data in OL3

I have a small app where I would like to be able to digitize new features and save them for use outside the app. I am using geojson as I don't have a geoserver I have managed to create a button that ...
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180 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 ...
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98 views

GeoJSON to routing graph

What are the best automated ways of placing the nodes and edges of a routing graph using the GeoJSON data of a multi-level building? What other data is needed (area layout, accessor directions etc)?
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223 views

Why can't gdal save CRS information to GeoJSON?

gdal fails to add CRS definitions to GeoJSON files in some cases. Try this, for example, from any linux terminal that has gdal installed: # download the data wget ...
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52 views

Read and Write data with Open Layers3

I'am currently using postGIS/geoDjango/OL3 I need the capability for a user to drop a point on the map, and store that in my database. When any user returns, that point will be shown on the map. ...
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86 views

Extract polygons of PNG with GdalOgrInJava

I have PNG pictures with polygons of different colours on them. What I plan to do is to extract these Polygons using the polygonize function (see here) Then I will try to encode the polygons in ...
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50 views

Export isochrones to images

I'm looking for automated/scripted ways to generate PNG images based on GeoJSON multi-polygons. I have multiple polygon isochrones for a given starting point, e.g. 10 minutes, 15 minutes, 30 minutes, ...
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258 views

How to get feature on vector layer in Openlayers 3?

I'm try to get feature of a vector layer, but I'll have 3 or more Vector layer. When I click the map, I didn't get the feature. My vector layer definition; var vectorAltAlan = new ol.layer.Vector({ ...
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326 views

leaflet layer control checkbox options min/max

I have a straight forward leaflet map that is on a webpage. I am using the angular-leaflet-directive and all works as expected except for the layer control box. When only one baselayer is specified I ...
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140 views

How to change color of points dynamically from a geoJson in openlayers

I am new in Openlayers and what I am trying to do is to dynamical give a color to some points read by a GeoJSON file. I am taking inspiration by this post How can I add an infowindow to an ...
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468 views

Attribute search in Leaflet

I have added the attribute search plugin to my leaflet map, but I cannot use in the correct way. Somehow my script loads the GeoJSON features two times. The first are the styled markers, the attribute ...
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60 views

how manage mysql spatial polygons in parent child style

I want to store location-polygon data in a parent-child relation. I am using spatial data in MySQL and Google map for polygon. Eg: World 1.1 US 1.2 China 1.3 Japan 1.4 South Africa 1.4.1 Pretoria ...
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76 views

Openlayers external GeoJSON error handling

I'm making a map which refreshes itself in a given interval and shows the progress of objects on a vector layer with information from an external GeoJSON file. When the server is not accessible, or I ...
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182 views

Merge overlapping GeoJSON GeometryCollections

I need to merge three overlapping GeoJSON GeometryCollections of Polygon. Ultimately, the end result needs to be a geom type for PostGIS (e.g. MULTIPOLYGON) so I can easily check if particular points ...
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82 views

QGIS view bounding box on Add vector layer GeoGSON protocol?

Our server can serve GeoJSON with an optional bounding box HTTP parameter. e.g. http://our_gis_server.org.au/layername?bbox=xmin,ymin,xmax,ymax In QGIS I can add this vector layer as a Protocol and ...
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398 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' ...
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754 views

“Can't extract geo keys from object, malformed geometry?” Possible self intersection?

My '2dsphere' index creation fails at a document. The command i write for creation of index is: db.collection.ensureIndex({'geometry' : "2dsphere"}) It returns the following error: { "err" : ...
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74 views

GeoJson attributes encoding limitation

I have problem when trying to encode attribute values in latin1 using ogr GeoJson driver. Accent char are not displayed correctly. Is the geoJson encoding is limited to UTF-8? I cant find any info ...
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159 views

mongoDB query not working as expected

My mongoDB collection has all three types of shapes. A point is stored as { 'CE_NO': '_', 'E_NAME': 'RAILWAY BOOKING CENTER', 'SRCTYPE': 'Facility', 'geom': { 'coordinates': [ ...
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260 views

django---error in displaying data and displaying it on the map

. i am trying to display a feature queried from postgis. . i also designed a user input field to enter the id of the desired feature to be displayed. . i have already queried the attributes first ...
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841 views

Access-Control-Allow-Origin problem when loading json file from Amazon S3 to display in OpenLayers

This is my code for displaying geojson in OpenLayers, where "geourl" is directed to a json file in Amazon S3. geojson_layer = new OpenLayers.Layer.Vector("GeoJSON", { strategies: [new ...
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113 views

Possible to rollback from QGIS 2.0.1?

I'm running Ubuntu 12.04 LTS. Unfortunately Ubuntu has automatically upgraded my QGIS from 1.8 to 2.0.1. And 2.0.1 which creates GeoJSON files that OpenLayers cannot parse. Would be best for me to ...
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907 views

OpenLayers and GeoJSON - possible to create, modify and delete features?

I wondered if anyone has some OpenLayers GeoJSON code to read, create, modify and delete features (i.e. instead of using WFS-T)? This is how far I've come - I've no problem changing the pop-up to a ...
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473 views

translating and scaling viewport to fit geojson map in D3js

I am trying to load a map of Rio de Janeiro (Brazil) in GeoJson for with D3js the code and the map is here: https://gist.github.com/4157853 I can open the map normally with Qgis, but with d3js ...
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1k views

searching GeoJSON features

After googling for many days and reading the OL documentation, I don't understand well how the filterToParams in OpenLayers.HTTP protocol should work, what I'm trying to do is to find and display the ...
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152 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? ...
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32 views

populating a geojson from postgresql with php depending on zoom level

i am about to load a few thousand polygons (a grid 500x500m) from a postgresql db into a leaflet map with php script converting the data into a geojson. the php script populates the geojson depending ...
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44 views

Failed to load resource: the server responded with a status of 404 (Not Found) Django while displaying geojson data on map

I'm getting the following error when I try to diplay geojson data on map. http://localhost:8000/geojson/%7B%22type%22:%22Point%22,%22coordinates%22:[76.996944,31.58]%7D Failed to load resource: the ...
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32 views

Add vector icons and popups in openlayers 3.11

here's what I am working on: http://environmentalobservatory.net/Calumet/3scale.html It works great so far and now I want to put icons, or what we used to call "markers" on it. But I can't find any ...
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12 views

MapInfo2leafletjs tool

I've downloaded a tool to export a table from MapInfo GIS to leafletjs. The base map from Openstreetmap has been created, but the choropleth map of regions is not being displayed. One possible ...
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27 views

Pivoting around Geojson variable symbology in Leaflet Map

I currently have geoJson loaded in to a leaflet map where I want to change the variable symbolised. The symbology rules can all be the same for each variable visualised. I need to find a way of ...
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35 views

Having trouble getting geojson to show up with leaflet from geoserver

I have enabled jsonp in geoserver/WEB-INF/web.xml. It appears in my layer preview in geoserver. I cannot seem to get my geojson layer to show up in my map. The tiles show up but with no layer. Not ...
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44 views

Leaflet - divIcon size options are not applied

I am using a divIcon (an svg) for markers given to a point layer from a geoJSON for a map built with Leaflet/Mapbox. I can set the (initial) icon size with a css class, but if I try to set the ...
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12 views

Leaflet geoJSON point layer with divIcons (SVGs) how to toggle visiblity?

I have posted a few related questions about this topic here here and here. I have tried to set the opacity of the layer, then reset it with setStyle on a zoom event like so: Layer18 = ...
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31 views

how to add multiple divIcons to each point in a geoJSON - Leaflet

I am trying to add divIcons (SVGs) as markers to a point layer from a geoJSON in a webapp using Leaflet. I need to have different sized markers at different zoom levels. I have asked related ...
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66 views

Leaflet / JQuery -cannot add or remove class to divIcon marker

(this is related to a previous question of mine) I am adding a divIcon (an svg) as the icon for features in a geoJSON, using Leaflet. I can add a class to the html property of the icon, but I cannot ...
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35 views

Searching for UN regions/sub-regions shapefile

for a visualisation project I need the boundaries of the UN regions as defined here : http://unstats.un.org/unsd/methods/m49/m49regin.htm That's 21 polygons for the sub-regions. I have been looking ...
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31 views

How to add the geometry to google maps from geojson(retrieved as json) for a specified condition using javascript

I have a array called place_names which holds some place names. I have a GeoJSON layer loaded in CartoDB, which has three columns id, name and the_geom (which is a geometry object) that can be queried ...
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23 views

Openlayers GeoJSON write not maintaining projections

How do I get GeoJSON.write to maintain the projections used in the construction of the GeoJSON? points.geojson {   "type": "FeatureCollection",   "features": [     {       "type": "Feature",       ...
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19 views

Apportioning census data using GeoJSON?

I am working on a project now that requires me to merge/dissolve census tracts into predefined neighborhoods. I know this is possible using ESRI's apportionment functions, but I am currently working ...
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34 views

GeoJSON to GPX with togpx

I have a leaflet map that I use for directions (routing) and I'm trying to convert geoJSON to gpx (for exporting) using the togpx js. Everything works okay and I can see the gpx in my console, but ...
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125 views

Adding time slider control to OpenLayers map?

I am looking for a way to add a time slider control to my OpenLayers 3.10.1 map. This control would load properties from different years of a vector layer, as in the following map: ...
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60 views

CartoDB data load from csv , geojson file error

I had installed CartoDB locally on my Ubuntu 12.04 and the installation was perfect. I can create dataset by CartoDB's GUI and able to visulaize data perfectly without any problem. But when i drag and ...
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69 views

geojson very slow to load in openLayers3

I'm new to openLayers. I have parcel data stored in a geojson file, and it's pretty huge - there are about 170,000 records. I would load the data as a WMS, but I want the features to highlight in a ...
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44 views

Web mapping application with select/unselect features and receiving names of selected features on map

I am creating web application that need to have the following functionality: display polygonal features on the map (about 20-50 Mb if GeoJSON) on click on feature - select them and view names ...