An open geographic data format based off of JavaScript Object Notation

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2
votes
2answers
110 views

Coordinate Not Match - Convert Shapefile to Geojson

I'm a newbie at GIS programming and I have a problem with file conversion. I've tried to convert shp file to geojson, and the coordinates do not match. But when I try to convert it to kml, it goes ...
2
votes
2answers
695 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
1answer
2k views

D3.js cannot render my geoJSON file

I've been trying to draw maps using the d3.js library in a manner similar to that below. <script> //Width and height var w = 500; var h = 300; //Define path ...
2
votes
3answers
598 views

How can I create GeoJson map from OSM Data

I am trying to build a map of countries in the some countries in Europe (Spain/France/Portugal). What is the best way to build such map: Should I look for shp files, then concatenate them. Is ...
2
votes
1answer
2k views

Convert Multipolygon Geojson to multiple geojson polygons?

I see a lot of questions going from Polygons to MultiPolygon, but is there some easy way to go the other way around? It would also be useful to preserve the attributes from the MultiPolygon to apply ...
2
votes
2answers
2k views

How to plot geoJSON using Python?

I have huge geojson file that I am working on: [{ "geometry": { "type": "MultiPolygon", "coordinates": [ [ [ ...
2
votes
1answer
150 views

When do GeoJSON feature collections need feature ids?

I've seen feature collections with feature ids for each feature. I've seen others with no featureid. When do you need it?
2
votes
1answer
1k views

Openlayers dynamic filtering/styling of geojson layer

I'm working with Openlayers and overlaying a geojson file representing species type over OSM. I have an HTML form that allows users to select a species type and I then need to filter the geojson layer ...
2
votes
3answers
801 views

How to create a efficent linestring out of geography points using postgis

I'm trying to create a linestring out of geography points. At the moment I'm doing it like this: select ST_GeographyFromText(ST_Makeline(a.record_point)) from ( select (record_point::geometry) from ...
2
votes
1answer
54 views

Invalid GeoJSON when inserting data to a CartoDB (PostGIS) table from Leaflet

I've been following along to this tutorial from CartoDB. I create the GeoJSON using: var drawing = "'"+JSON.stringify(layer.toGeoJSON())+"'"; and then inserting using a custom SQL function ...
2
votes
2answers
100 views

ogr2ogr - Lost projection when converting geojson to MapInfo Tab

I have the following geojson that I would like to convert to MapInfo tab with ogr2ogr: ogr2ogr -f "MapInfo Tab" output.tab input.geojson geojson: { "type":"FeatureCollection", "crs":{ ...
2
votes
1answer
928 views

shapefile for mumbai area or section wise

I am working on a project in which i need to plot data on Mumbai city map section wise or area wise but i am not able to get Shapefile for the same. Can anyone please provide me the link where i can ...
2
votes
1answer
356 views

OpenLayers and GeoJSON

Recently I started learning Openlayers 2x and I've been struggling for a while now with a GeoJSON and it's projections. So, here is the deal; I successfully added wms layers from ( ...
2
votes
1answer
311 views

My woes rendering shape files on web-based mapping application

First, I'd like to let it be known that this is my first journey into developing mapping applications with such a large set of data. So, I am in way locked into the techniques or technologies listed ...
2
votes
1answer
2k views

Adding popup to geojson layer based on feature property?

I'm using leaflet and trying to add a popup to a point on the map that will return a property of the point from the geojson file. Going off this post has been helpful problem adding pop-up to GeoJSON ...
2
votes
1answer
137 views

Access to custom GeoJSON members in OpenLayers 2

I need to read a layer-wide attribute, from a GeoJSON file, set by a custom member to the object: {"type": "FeatureCollection", "features": [...], "search_polygon": "POLYGON (...)"} Since it seems ...
2
votes
3answers
1k views

Shapefile to GeoJSON conversion

I am working with OpenLayers. I want to convert Shapefile into GeoJSON format and send it to browser to show with OpenLayers. But the problem is that when the size of my Shapefile is bigger than 60Mb, ...
2
votes
2answers
801 views

How do I convert open street map export to geojson?

I am trying to render this output from open street map into geojson to add into a map. I only need to export the data one time. How do I do that? OSM lists it as a use case. I see a js library to do ...
2
votes
1answer
194 views

How could I generate a CRS field inside the GeoJSON object created by Leaflet layer.toGeoJSON?

I'm using Leaflet to transform some drawn polygons to GeoJSON and send them to a backend. But the GeoJSON objects generated by layer.toGeoJSON are like this: { "type":"Feature", "properties":{}, ...
2
votes
2answers
432 views

animate polygons in series of kml/geojson/shp

I have a series of KML files (though they could easily be converted to geoJSON, SHP, or anything else that ogr2ogr can handle), each file containing a set of polygons that correspond to the alpha ...
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
3answers
636 views

GeoJSON generator with OpenLayers support

Is there a service that allows me to draw on an OpenLayers map, and see the resulting GeoJSON?
2
votes
1answer
1k views

Polymaps Project + Geojson + D3

How are you doing ? I am Mehul Nahar working on a project which is similar to http://www.tableausoftware.com/learning/examples/gpa-analysis. I have used Polymaps platform, where I have used cloudmade ...
2
votes
4answers
158 views

Python Library for converting GeoJSON Multi-polygon to polygon

I would like to know if there is a Python library that can be used to convert GeoJSON Multi-polygon to a Polygon. Note: i want to convert .geojson file Multi-Polygon feature type to Polygon feature ...
2
votes
2answers
61 views

cannot open shape file

I'm trying to open this shape file with CartoDB or http://geojson.io, but I keep getting different kind of errors. I can open it with qgis, but then I tried exporting it to geojson, kml, esri shape, ...
2
votes
2answers
59 views

How to enable Arabic/UTF8 labeling in Openlayers?

I have data in Geojson contains arabic in some attribute when reading the attribute info.push(features[i].get('Name')); I get this Unreadable how to enable utf8 or I dont know....
2
votes
1answer
172 views

GeoDjango Setup: Python 'GDALAllRegister' Attribute Error

I am trying to setup Geodjango 1.8 in a virtualenv with Python 2.7.9 (Win32). I have installed and setup Postgres/PostGis and have my Path setup to my OSGeo4W directory. I have also installed the ...
2
votes
4answers
433 views

How can I publish a Google Sheet to the web as a GeoJSON file?

I am trying to create a map in Mapbox to be embedded on a website and have the embedded map automatically update every time the source data is updated. I have my source data in a Google sheet and have ...
2
votes
1answer
404 views

dissolve polygons of GeoJSON with gdal/ogr

I have a GeoJSON with only polygons in it. I have to dissolve (merge) the polygons with the same "DN"-value. I found out that you can do it with shapefiles like this: ogr2ogr outputfile.shp ...
2
votes
1answer
425 views

Difference between TileStache and Geoserver?

I have troubles to understand the differences between TileStache and Geoserver. My goal is to serve tiled geoJson through a restFull API and consume it with Leafet. Which one is the best for this ...
2
votes
2answers
107 views

How to encode a point geometry in Geojson?

I have point geometry in posgresql which I query as follows: select ST_AsText(geom) as pointgeom from pointable. I'm using python as server side script. I want to pass the result as Geojson response ...
2
votes
2answers
2k views

Change marker color based on GeoJSON filter in Leaftlet

This is what I would like to do: Display all features of a GeoJSON file using Leaflet. Provide a text box where a property can be entered, if any of the GeoJSON properties match with what is entered ...
2
votes
1answer
503 views

How to get a table from a leaflet map?

I have a map Here based on leaflet JS and the layers are geojson. I would like to get a table at on another div when I click on each layers. How would I be able to do that? Thanks
2
votes
2answers
290 views

PHP examples to replicate FeatureServer capabilities

I used FeatureServer before and I liked it. The only thing I didn't like, though, is that it needs some other dependencies to work. That's why I want to try PHP instead. I know that there are already ...
2
votes
1answer
307 views

Unicode Decode Error for shapefile in Python

I have Python script for converting shapefiles to Geojson. My code works well if I use some usa data, but when I want to use some other encoding, it gives me this error: Traceback (most recent ...
2
votes
1answer
93 views

GeoJSON and HTML/JavaScript vs Shapefile and Silverlight

I'm developing a map application (Several shapefiles with OpenstreetMap or BingMap on background and some dynamically generated features on the map). I'vs created some part of it with Telerik RadMap ...
2
votes
2answers
155 views

Row-crop field boundaries

I'm on the hunt for field boundary coordinates in the US in the form of GeoJSON, a Shapefile or any structured format that I can use to overlay on a map. I've tried looking at the US Department of ...
2
votes
1answer
534 views

Merge multiple linestring features into a single multilinestring

Using QGis or ogr2ogr how do I convert a vector file containing multiple linestrings features into a single multilinestring feature? At the moment I've been doing this manually by converting the data ...
2
votes
1answer
341 views

How can I dynamically add features to a GeoJSON file? [closed]

I have tons of pictures which I am showing in markers on a LeafletJs map and currently have a fixed GeoJSON file. So I want to know is there any easy way to dynamically add new features to the GeoJSON ...
2
votes
1answer
432 views

Issue with using TopoJSON server API to return TopoJSON object with properties

I am creating a node application and using TopoJSON server API reference (see the link below) to convert a GeoJSON object to a TopoJSON object. TopoJSON server API reference I used these three lines ...
2
votes
1answer
654 views

Converting JSON/GeoJSON files to Shapefiles

I have a quick question please about converting JSON/GeoJSON files. I'm trying to convert some JSON files into something I know how to work with (shapefile, R objects or PostGIS). I'm afraid I have ...
2
votes
2answers
409 views

Sending map extent in (geo)JSON

I have a leaflet map that I need to fitBound on a given rectangle. The coordinate for the fit bound will be transfered in JSON via a REST call on a server. We are using GEOJson to encode our geometry ...
2
votes
1answer
925 views

Converting wkt to geojson with OpenLayers

I am trying to convert wkt to geojson wit OpenLayers. I wrote my code based on this question (geojson to wkt). That's what I have so far, but it is not working. Any ideas? var = ...
2
votes
2answers
6k views

How to project pixel coordinates in leaflet?

I am trying to create a map based on an image which is 16384x16384 px, but I would also like to add markers at specific locations using pixel coordinates of this given image. I created a tile layer, ...
2
votes
1answer
204 views

simplilfy geojson file [duplicate]

I have a geojson file, but it's way too heavy for the app I need to develop I'd like to know what alternative do I have to make it lighter. I was thinking about simplifying it's shapes, and also ...
2
votes
2answers
624 views

Show different marker for cluster and icon for single vector features in OpenLayers

I have a vector layer which is geoJSON file containing school points and their attributes,to visualize this i defined cluster and show circle which size is based on the number of features it contains. ...
2
votes
2answers
927 views

How do I sort a geoJSON feature collection alphabetically by a property value?

I am trying to sort the objects in a geoJSON FeatureCollection alphabetically by the values of one of their properties. How do I get to the nested object properties with JavaScript? I have tried using ...
2
votes
1answer
152 views

Which fields are standardized to describe a ShapeFiles feature?

I would like to store data into a database which is available here either as JSON or as ShapeFiles. The JSON looks something like this: { "type": "FeatureCollection", "features": [ { ...
2
votes
2answers
3k 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 ...
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 ...