An open geographic data format based off of JavaScript Object Notation
0
votes
1answer
31 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.
{
...
4
votes
3answers
67 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
(
{
...
1
vote
2answers
70 views
How to add a polygon from GeoJson 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);
}
...
0
votes
0answers
17 views
How to add clickable action to each feature from a featurecollection geojson object rendered using OpenLayers?
I have geojson object which is a featurecollection object. I need to render this geojson object as a vector layer on openlayers map. I have successfully rendered the layer. Now i want to add clickable ...
1
vote
1answer
84 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 ...
0
votes
1answer
68 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
49 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.
...
0
votes
4answers
153 views
preferred 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 ...
2
votes
3answers
71 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 ...
1
vote
1answer
41 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
60 views
Saving part of OSM shapefile in QGIS as GeoJSON strips 'name' field to 25 characters long
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 ...
0
votes
1answer
18 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 ...
0
votes
2answers
81 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?
0
votes
1answer
81 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 ...
0
votes
0answers
72 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
0answers
61 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.
...
0
votes
1answer
75 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
80 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 ...
2
votes
1answer
161 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
147 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 ...
0
votes
0answers
26 views
Where do I find intra-city zone shapes?
We're building a project that lets you visualise data about zones within cities such crime rates and wealth. So for example in London you could compare the various boroughs. For this, I need to bulk ...
1
vote
1answer
141 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 ...
6
votes
2answers
212 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
62 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
132 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
141 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
123 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
133 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
156 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
103 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 ...
3
votes
0answers
51 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 ...
0
votes
0answers
91 views
Creating a Map Tile Server?
So, I've fallen in love with Mapbox's javascript API, but I'm working for a non-profit that can't afford Mapbox's hosting. Luckily, their js accepts TileJSONs and makes reference to TileStream on ...
1
vote
3answers
228 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
30 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
172 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
383 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
133 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 ...
6
votes
5answers
345 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
334 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 ...
4
votes
1answer
193 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
255 views
Spatial Data from Postgis to Java/REST with RestEasy + Jackson
I'm developing an application where I take a route from google maps, save it in postgresql/postgis. I'd like to take this route (LineString geometry) and send it back to Google Maps.
I already can ...
5
votes
4answers
300 views
GeoJSON too bulky - what to do?
I am using leaflet.js to allow web users to select a region. Valid regions are US states, Canadian providences, and world countries (except for US and Canada). I constructed a shapefile myself using ...
0
votes
0answers
81 views
Regional statistics from a dataset (point inside a polygon aka region)
I am relatively new to GIS and I am trying to do some geographical analysis on same data I've collected. The dataset I have consists essentially in a file with the following format:
...
3
votes
1answer
133 views
ogr2ogr from Postgres to GeoJSON missing crs key
I'm using ogr2ogr to convert some OSM data for Greenland (not really important for the question), from a PostGIS database to a file containing GeoJSON.
The problem is that the GeoJSON gets written ...
4
votes
1answer
179 views
Real time positioning of vector features using database
I am a newbie in GIS and want to implement something like a vehicle tracker wherein I will get a series of coordinates in a database.
I have no idea how to go about it, I mean what should my process ...
2
votes
1answer
214 views
How to visuilze PostGIS data in GeoJSON format with PHP
I need to visualize PostGIS Geometry column as an overlay of a Leaflet tiled Map. I started a question here ,but didn't get any simple and satisfied answer. So I am starting this question. I got an ...
4
votes
1answer
129 views
binding nested arrays as geojson popups in leaflet
I am struggling with geojson popups in leaflet.js
I have nested arrays as properties for my features -
an example would be counts of fish caught at a location (not my actual project data!)
...
10
votes
1answer
1k views
Convert GeoJSON to TopoJSON
Question
How do you convert GeoJSON data to TopoJSON?
Why
Most likely, because you want a smaller file size. From the TopoJSON docs:
TopoJSON eliminates redundancy, allowing related geometries ...
1
vote
1answer
461 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 ...
1
vote
2answers
165 views
Trouble with GeoJSON in HTTP GET Request
I using a Vector Layer with the HTTP protocol to request GeoJSON from my web server, and am trying to get this GeoJSON to display on my map. The GET request appears to be working correctly, as I can ...
