An open geographic data format based off of JavaScript Object Notation

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4
votes
1answer
141 views

Leaflet: how to change default style on a point GeoJSON Layer?

I need to change style on a point GeoJSON layer in a Leaflet map. I'm using the following code: function onEachFeature(feature, layer) { if (feature.properties && ...
2
votes
1answer
266 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. ...
1
vote
2answers
247 views

Converting Shapefile data to GeoJSON

I have access to some open data for which I want to obtain some coordinates to put onto a map. Unfortunately, the data is in the Shapefile format which is rather difficult to work with. I am trying to ...
1
vote
1answer
139 views

Error inserting GeoJSON in PostGIS

I know there is a similar question but I am getting a different error and none of those answers have helped. I am trying the following query (the GeoJSON itself is from the PostGIS website. INSERT ...
1
vote
0answers
101 views

What is wrong with my data receiving from php script for geoJSON TileLayer?

I want to get geo data as geojson for geojson tile layer requests in leaflet. I set up a geojson layer like this: https://github.com/glenrobertson/leaflet-tilelayer-geojson/ A php script answers ...
1
vote
1answer
61 views

Unable to save to in Geojson format with the correct projection

I have a shape file (Polygon) in Qgis that I wish to save in Geojson in order to display it with the mapbox javascript api. Original projection is in POSGAR 97 My issue is that it does not reproject ...
1
vote
1answer
259 views

Query and Visualize GeoJSON data [closed]

I am trying to visualize specific GeoJSON data. I am successfully loading the full GeoJSON file (Multipolygon) using Leaflet JS. Is there any query to find specific polygon from that GeoJSON file? ...
1
vote
1answer
141 views

Simplifying Shapefile without risking Spatial Accuracy?

I am building a feature for a web application. Basically would use the ABS (Australian Business Statistics) data to render the regions on the Google Maps. I am able to implement the basic working ...
1
vote
0answers
43 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 ...
2
votes
1answer
65 views

Add GEOJSON layer in tilemill EACCES symlink Error

I'm trying to add a GEOJSON layer to Tilemill [ Version 0.10.2 (v0.10.1-293-g697c86c) ], installed on ubuntu 14.04. I've confirmed that the ID used is unique and attempted to load the file into my ...
2
votes
0answers
57 views

loading geojson in leaflet

I just added the geoJSON vector layer in leaflet for my hybrid mobile app using phonegap, the problem is that when I add the geoJSON file of size larger than 2mb the application crashes. What is the ...
1
vote
0answers
41 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 ...
1
vote
0answers
196 views

Formating geojson file with leaflet ajax-plugin

First of all I apologize for my basic english. I have to say, too, that I'm really a newby in coding. I'm trying to create an interactive map using leaflet (you can see it here). I was able to show my ...
4
votes
3answers
179 views

Adding Properties to GeoJSON File

I have a GeoJSON file of the country of Haiti with the administrative boundaries for communes (i.e. counties). Here is the file: ...
2
votes
0answers
100 views

How can I merge adjacent polygons and return all (adjacent and not adjacent) as Multipolygon?

I have a postgres database with administrative boundaries and their geometry. Each of those boundaries have an ident number. What I want to achieve: First I want to select all rows which are ...
2
votes
0answers
78 views

Adding marker on a leaflet map

I'm very new to GIS and for learning I started with building a simple web app with GeoDjango. I am using dango-leaflet. Since I have a very limited knowledge I am facing many challenges. I'm trying to ...
2
votes
1answer
62 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 ...
4
votes
2answers
508 views

get map tiles for a polygon

Based on this tutorial, I can easily find out a tile for a point. But is there an algorithm to find all tiles that are covered by a rectangle or lineString or by any other feature? I would greatly ...
0
votes
0answers
135 views

GeoJson layers with leaflet in IE8

I have built a website displaying a lot of line shapes, using geojson, on a leaflet map. This is working relatively well in most browsers, though speed could be improved. As usual IE8 is being the ...
2
votes
1answer
43 views

Figuring out what coordinates supposedly using 'NAD31 projection' refer to

I'm working with a GeoJSON file that contains sets of coordinates associated with street corners in the city of Montreal, Canada. The spec sheet of the API delivering those GeoJSON specifies that the ...
1
vote
1answer
48 views

Retrieving routedescription geometry as GeoJSON

I'm building a small web-map and would wich to display a polyline representing a specific route via roads. With leafletjs it is easy to display the geometry on/over the map. So that's not the problem. ...
0
votes
0answers
60 views

geojson object with different representations and label/popoup conten

I have a quite complex geojson in terms of vertexes. It holds all the information which is needed in the webmap. it serves as the input for many layers like this (example for two): var represenation1 ...
1
vote
3answers
1k views

How to change Leaflet marker color on mouseover?

I'm having a hard time figuring out why the Leaflet method setstyle will change the color of a polygon but not the color of my markers. Polygon works fine: But the markers won't change colors: ...
0
votes
1answer
34 views

Not empty geometry having blank text

i'm having problem with geometry column, for some rows i have geometry with blank text, this query will describe more the problem : select geom, ST_AsGeoJSON(geom), ST_Isvalid(geom), ST_IsEmpty(geom) ...
0
votes
0answers
81 views

How to hide overlays in Leaflet layerControl if geojson var not found?

i would like to perform a specific task: i have a set of geojson layers, loading features from local files. i have the layercontrol on the map showing available layers to show/hide now, regarding ...
2
votes
1answer
204 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 ...
6
votes
4answers
369 views

How to use Leaflet to efficiently show parts of a massive dataset?

I keep seeing non-GIS web developers running into this problem, and I'm not sure what the solution is. There is some dataset of thousands of items. We want to show a map to the user, with the ...
1
vote
0answers
98 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 ...
5
votes
2answers
236 views

Leaflet: How to enable pan & zoom while GeoJSON still rendering?

I've overlaid a huge GeoJSON geometry on top of my Leaflet map, covering about 20 countries' borderlines (about 1,5 million vertices) using "L.geoJson". Each time I zoom in/out, the computer has to ...
1
vote
1answer
185 views

Translate coordinates in GeoJSON export

I am wondering if there is a way to apply a translation in coordinates for a GeoJSON export. Currently, there are negative coordinate values in my export, which I cannot have. I am trying to use ...
1
vote
0answers
53 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 ...
2
votes
1answer
337 views

Merge two geojson files

I have a global json files about countries' boundaries but the Russia is in two parts (two polygons). I want to merge the two parts in one, without the boundary at the middle. Is there a way to ...
0
votes
1answer
79 views

Optimum set up for large data sets such as mobile service coverage maps [closed]

When serving up large data sets such as mobile coverage maps (custom tile) mashed up with MapQuest maps and MapQuest POIs, is there any performance benefit to using shape file VS WMS tile PNGs? Any ...
4
votes
1answer
129 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 ...
1
vote
1answer
105 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 ...
1
vote
2answers
185 views

Openlayers 3 display in Firefox and Chrome

I'm experiencing some issues with displaying OSM and GeoJSON. With Firefox v30 I see my GeoJSON data, but OSM is invisible. With Chrome v35 I see OSM, not my GeoJSON... What is the explanation? ...
3
votes
1answer
83 views

ogr2gui geojson to csv do not export coordinates

I tried to convert ogr2gui to convert geojson files to csv. The geojson file contains point data only. The resulting csv only contains attribute data, no coordinates. Is there a way to get the ...
0
votes
1answer
13 views

Guideline/scheme for naming properties in GeoJSON

Are there any guidelines/requirements for naming properties in GeoJSON? Should I add a vendor-prefix for my properties which only make in use with a specific application? I already read the ...
0
votes
0answers
392 views

openlayers 3 geojson style

here's a part of my html/js file. I cant display my geojson and really dont know the reason why. debug only says : "TypeError: f is null" any1 help ? Thx var map = new ol.Map({ target :'map', layers: ...
0
votes
0answers
116 views

OpenLayers Vector Features with common properties in multiple Layers

I am trying to manage features across different layers. Features are displaying weather parameters at some points on the map. Hence there is a wind layer, a temperature layer, etc. which all are ...
0
votes
1answer
253 views

Adding points from JSON to ArcGIS for Android?

I am new to Android, the ArcGIS Platform and ArcGIS for Android. I need to load points (offline) from a JSON file (GeoJSON) onto the map which displays a local Tile Package (*.tpk) and shapefile.
1
vote
1answer
169 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' ...
0
votes
1answer
239 views

Displaying properties from GeoJSON file in choropleth map Leaflet.js

I'm using the Leaflet.js library to generate a choropleth map of zip codes colored by some property values stored within an externally loaded GeoJSON file. I'm following a tutorial here but have run ...
5
votes
3answers
460 views

Is there a API which return the geojson data for a countries borders?

Is there a simple free REST API where I can send the name or code of a country and get in return geojson data which highlights it's borders ? I'm writing an application where I will have a changing ...
1
vote
1answer
47 views

How to limit GEOjson data to specific area?

I am currently working with a shapefile from the United States Drought Monitor that countains all drought data from all of the states in the US. I am converting it to geojson with ogr2ogr and would ...
7
votes
1answer
152 views

Suitable algorithms for simplifying isochrone polygons

I'm looking for an algorithm for simplifying isochrones which were generated using OSM data. These are generally characterised as having lots of small "holes" mostly due to missing OSM data but also ...
1
vote
1answer
1k views

How to get LatLng array from geoJSON Layer in Leaflet?

i need to hand the latlng coordinates from my phpPostGIS-served geoJSONLayer as an array over to a new added HeatMap Layer. L.geoJSON has an build-in option: coordsToLatLng( coords )" and a static ...
1
vote
0answers
493 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" : ...
1
vote
2answers
169 views

Data structure: mongoengine to GeoJson

I recently posted my first question on StackOverflow, but I think the question was quite extensive and full of potential errors. So I'd begin again, step-by-step, with a much shorter and simplier ...
2
votes
1answer
461 views

What is the best or recommended way to store a GeoJSON FeatureCollection in MongoDB?

The comments in this question: Shapefile to GeoJson conversion using C# raised another one: what is the best way to store a GeoJSON FeatureCollection in MongoDB? Is there any sort of convention when ...