An open geographic data format based off of JavaScript Object Notation

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4
votes
1answer
656 views

What are the default units of elevation/altitude/z in GeoJSON?

The GeoJSON spec says "The default CRS is a geographic coordinate reference system, using the WGS84 datum, and with longitude and latitude units of decimal degrees". It doesn't say seem to specify ...
0
votes
2answers
436 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 ...
1
vote
2answers
407 views

Can't read returned geojson

I've got a function that takes an Openlayers mouse click and puts the click location into a SQL statement which then gets passed to a JSP script which runs the SQL statement on the PostGIS database ...
1
vote
1answer
284 views

How do you make a function for changing projection with proj4js in Openlayers?

I have included Proj4js in OpenLayers. I would like to create a function (so I can use a make a button). To change the projection of my map. I have included in javascript Proj4js.defs["EPSG:54008"] ...
0
votes
2answers
156 views

How do you get all info from GeoJSON layer in Openlayers?

In OpenLayers I have added a GeoJSON layer (of the world) and created a simple infotool. The GeoJSON layer contains multiple features for some countries. If I click on a country I only get one ...
1
vote
1answer
281 views

OpenLayer and not well formed Json

I am learning to use GeoExt and OpenLayers, and I want to reproduce one of the examples given at the geoExt website. The script call a GeoJSON containg the position of Alp summits. I downloaded it via ...
1
vote
2answers
2k views

Loop over features of a GeoJSON object from CartoDB

I have just little knowledge about HTML and JavaScript. Nevertheless I was playing, copying and pasting around with Leaflet and CartoDB. I want to display the features GeoJson in a table. This is ...
1
vote
2answers
550 views

Looking for a GeoJSON describing the french departments

Is there any place where I could find a GeoJson describing the borders of the french departments, or do I have to convert a .shp file?
1
vote
1answer
903 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 ...
0
votes
1answer
364 views

geojson -> topojson : no output

Trying to convert my geoJSON file into topoJSON so I downloaded topojson from npm and followed the instructions on gis.stackexchange Convert GeoJSON to TopoJSON basically the same as the topoJSON ...
-2
votes
1answer
79 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. ...
6
votes
2answers
3k views

Is there any efficient way to convert Geojson to WKT?

I want to use ST_GeomFromText() to load vector data to PostGIS. However, I don't know how to convert from Geojson type to WKT. N.B. I know I can use OGR2OGR to upload the geojson directly, but I just ...
1
vote
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
1answer
817 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 ...
0
votes
1answer
968 views

PostGIS error reads “Geometry has Z dimension but column does not” [duplicate]

I try to store a polygon in GeoJSON format into my PostGIS table. Both are using the CRS EPSG:3857. This is how the polygon is defined. Note that I put in some whitespace to make it more readable. { ...
10
votes
4answers
6k 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 ( { ...
3
votes
3answers
2k 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); } ...
2
votes
1answer
2k views

Conversion from Shapefile to TopoJSON format results in incorrect map when rendered using d3js

I am trying to build a map of Canada showing FSA boundaries using d3js. I got shape data from Statistics Canada ...
2
votes
1answer
330 views

Kartograph Open Street Maps

Firstly, congratulations to Gregor Aisch for creating such a wonderful library, thank you! I am having a little trouble rendering an svg from some osm data. I downloaded the Sweden transportation ...
3
votes
2answers
184 views

Performance loss for OpenLayers EPSG transformation? Storing GeoJSON coordinates in lat/lon or in native map projection?

For a project the map projection is EPSG:32468 (tiles). On top of the map, two or three GeoJSON LineStrings should be displayed using OpenLayers. Each LineString has about 1500 coordinates. ...
1
vote
4answers
388 views

Does shapefile or MapInfo TAB have advantage as source format for OGR conversion to GeoJSON?

I'm relatively new to OGR and GIS in general. Most of the sources I look at give a choice of ESRI shapefile and MapInfo formats. I'm using ogr2ogr to convert these to GeoJSON for import into ...
5
votes
3answers
2k views

Interacting between Openlayers and Python

I have a openlayers website like this one that gives the user the ability to draw polygons and then creates a GeoJSON file. I want to process this GeoJSON with a python script. The python script ...
2
votes
1answer
274 views

SQL Command to convert pgRouting result to GeoJSON

My goal is to produce a Web UI for pgRouting using this tutorial. I have already imported my data from an OSM pBF to PostGIS using osm2po. Using the pgRoutingLayer plugin for QGIS, I was able to ...
0
votes
1answer
191 views

Saving part of OSM shapefile in QGIS as GeoJSON strips 'name' field to 25 characters long [duplicate]

I want to copy part of OSM data in ESRI Shapefile (downloaded from http://download.geofabrik.de/europe/ukraine.html ) and save in in GeoJSON to style later in Tilemill. After saving, I see that ...
1
vote
1answer
99 views

BBox missing when converting TIGER to GeoJSON

I can't get the bounding boxes of polygons if TIGER/Line shape files when converting them to GeoJSON using FWTools. The other default information is present and there is no difference between the ...
2
votes
2answers
1k views

GeoJSON to Shape file conversion with geotools

Can someone please provide me an example of how to convert GeoJSON to Shape file using geotools?
2
votes
1answer
868 views

What is the best way to use Leaflet and Geoserver to highligh a feature after a WMS request?

I have a web map, and I'm hoping to make it interactive. The layer I have is reasonably large, at 15 mb in GeoJSON format 4 mb compressed, so I don't want to load the whole layer as one file. But, I ...
1
vote
1answer
771 views

Reprojecting coordinates and geoJSON in leaflet

I have a Leaflet map in default projection and a wms layer also in default (web mercator) projection. I would like to add polylines and a geoJSON layer to my map, but the coordinates are in EPSG4326. ...
1
vote
1answer
205 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. ...
3
votes
2answers
436 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 ...
0
votes
1answer
4k views

GeoJSON Get Request MVC 4

I'm having trouble creating an OpenLayers Vector layer with GeoJSON data in an MVC 4 application. The GET request for my json file always comes back with a 404.3 error - page cannot be served ...
5
votes
1answer
3k 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 ...
1
vote
0answers
834 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 ...
1
vote
1answer
428 views

TopoJSON without Quantization

I have been investigating using TopoJSON files to map floor plans for various buildings. As GeoJSON these files render perfectly, however after converting to TopoJSON they are missing a lot of the ...
7
votes
2answers
2k views

Converting KML files for use with Python library Shapely

I am trying to get a KML-file (wijken.kml) into Shapely. The KML-file is validated against the proper XML schema, so I guess the input is correct. Routes I have tried: 1) Converting to WKT or WKB ...
0
votes
1answer
428 views

GeoJSON won't show in IE, but works fine in FF

I’m not sure if this question isn’t too specific for Stack Exchange, but I really can’t find a solution, and even extensive web search hasn’t brought up any help. There are similar, but different ...
0
votes
1answer
1k views

Problem loading a GeoJSON file using Openlayers

I am setting up a website using Openlayers and GeoJSON files. When I get the GeoJSON file using the code below it work as expected. url: "./file.geojson", But if I try and use the full domain ...
1
vote
1answer
2k views

OpenLayers and GeoJSON - problem projecting EPSG:4326

I'm trying to project some GeoJSON data but it ends up at 0,0. I've looked at other posts and tried those solutions to no avail. Can anyone help? Here is the code: <html> <head> ...
0
votes
1answer
899 views

Geojson multipolygon doesn't work with Leaflet bindPopup?

I have polygon and multipolygon data in Geojson format and when I try to bind popup for polygon, it works perfectly, and when I try to bind it for multipolygon, it doesn't work. Is that some Leaflet ...
1
vote
2answers
291 views

converted SHP to geoJSON - how to put this on OSM map?

I'm a beginner at this. I converted a shapefile to a .js file but I am having trouble adding this data to a map using leaflet. The osmscarb.js: var osmscarb = { "type": "FeatureCollection", ...
0
votes
1answer
947 views

Selection and Popups on Overlapping/Coincident Vector Layer Polygons in OpenLayers

I have a GeoJSON file of polygons that I am bringing into my OpenLayers session. Some of the polygons occupy the same space on the map. I am using a select control and popup control like:- ...
1
vote
1answer
1k views

How to add images in CartoDB infowindows

Can't seem to get the default site to display images. I've added hrefs to a image column. example; I've dragged the image column to the top of the infowindow sidebar app and it still just displays ...
4
votes
0answers
214 views

How do I clip Geojson FeatureCollection with another Geojson polygon

I have a GeoJSON file that contains one FeatureCollection with a bunch of features that are polygons. I also have the boundary of the continental USA in another GeoJSON file. I'd like to clip the ...
1
vote
3answers
2k views

Exporting 2 shp layers to geojson using quantum GIS

I will explain with an example: I have 2 shp files for Tanzania. Tanzania inland waters http://www.diva-gis.org/data/wat/TZA_wat.zip Tanzania administrative boundaries ...
1
vote
1answer
35 views

GeoJSON - Resymbolize without redownloading?

GeoJSON served via GeoServer to OpenLayers. Simple question - Is it possible to apply a new styleMap without redownloading the data from the server? I am currently using the following, but am ...
0
votes
1answer
675 views

Attribute extraction from GeoJSON to symbolize - OpenLayers

Loading polygons from geoserver via OpenLayers using GeoJSON. My plan is to symbolize using attributes in the GeoJSON. I am struggling to access the attributes. Any insight appreciated: The ...
1
vote
1answer
3k 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 ...
3
votes
3answers
889 views

How to properly convert landmass NaturalEarth data into GeoJSON?

100% Newbie. I've been following Mike's d3 Map Tutorial and I've come up against a challenge. I guess my question essentially boils down to: how does one generate the proper GeoJSON/TopoJSON files ...
9
votes
5answers
3k views

GML, KML, GeoJSON - Speed rendering 3109 polygons?

I am working with Geoserver, serving U.S. Lower 48 counties to openlayers (3109 polygons - lots more vertices). The counties are loaded into a postgis database. I am curious about developer ...
3
votes
1answer
944 views

How to avoid corrupt geometries when translating between TopoJSON and GeoJSON?

I'm trying to display some geojson vector features on a leaflet map. The size of my GeoJSON is too big (25.4mb of data, 8.47mb gzipped), so I'm trying to use a TopoJSON format to reduce the size ...