An open geographic data format based off of JavaScript Object Notation

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2
votes
1answer
145 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
0answers
24 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 ...
0
votes
0answers
19 views

error converting shapefile to geoJSON with Ogre online tool

I am using on online tool built with ogr2ogr to convert shapefiles to geoJSON: http://ogre.adc4gis.com/ It's worked well except for one shapefile, and I can't see why... The shapefile has only six ...
0
votes
0answers
47 views

OpenLayers and GeoJSON

there! 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 ( ...
1
vote
1answer
13 views

QGIS geojson vector layer

When I add vector layer to QGIS using geojson protocol, data form server are being displayed. Problem is that every change of map extent (pan, zoomIn, ZomOut) is causing request for same data again. ...
1
vote
1answer
271 views

How to write GML and GeoJSON features while retaining attributes in .NET?

I am developing a .NET project [C#] that needs to export/write features as GML and GeoJSON, including, of course, the attributes; data could queried by a database or manually entered. I checked ...
2
votes
1answer
245 views

How to get data from TileMill tileLayer properties in Mapbox for click/hover

I've successfully used Leaflet to load a geoJSON polygon-shapefile with data, and added click and hover interactivity to the layer. For a large dataset, I switched to mapbox.js 1.6.1, used TileMill to ...
3
votes
1answer
461 views

Large loads geojson from mysql to leaflet?

I have a mysql database with +25K rows including geometry and other attributes. Using a mysql2geojson php script I then added it to a leaflet map. It is super slow now, what can I do to boost the ...
1
vote
1answer
36 views

How do I make my map use a set of coordinates

Right a little background. I've made a custom google map with the google map api which has a few functions that work well within it - one specifically is limiting the user on what they can view within ...
3
votes
2answers
561 views

Offline Phonegap/Openlayers App

I have a mobile app that uses Phonegap with OpenLayers and Geoserver. Now, I need to make the app available completely offline. The amount of data points can get very large depending on what client is ...
2
votes
1answer
177 views

Using ogr2ogr to download GeoJSON files from ArcGIS MapServer

I am trying to download as a GeoJSON file a line feature from a ArcGIS MapServer REST Service run by the National Park Service (link is here) so that I can open the data in QGIS. Using the guide ...
0
votes
2answers
340 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
votes
0answers
18 views

Change Coordinates in GeoJSON with geojson-jackson

I have .geojon files that look like this: { "type": "FeatureCollection", "crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } }, "features": [ { "type": "Feature", ...
0
votes
1answer
88 views

How to query postgres with gis to get GeoJSON for GeoJSON tile layer?

I have a postgres database with one table like the following: CREATE TABLE post_pl ( gid serial NOT NULL, zip character varying(5), zip_n integer, city character varying(50), geom ...
1
vote
1answer
828 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 ...
2
votes
1answer
268 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
31 views

ogr2ogr convert DXF to GeoJSON with defined geometry

I trie to convert a DXF file into a GeoJSON file with: ogr2ogr -f 'GeoJSON' -sql "SELECT * FROM entities WHERE layer = 'geom_test'" test.json dfxtest.dxf Is it possible to convert only geometries ...
6
votes
1answer
120 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
106 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' ...
1
vote
3answers
32 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 ...
1
vote
2answers
365 views

Polygon intersection with bounding box with polygon's holes intact

I am trying to serve GeoJSON FeatureCollection tiles with each feature's geometries trimmed to the tile boundary. I am working on a Leaflet plugin to re-assemble the geometries. It works by building ...
0
votes
2answers
1k views

How do I modify features during runtime, in a GeoJSON feature group on Leaflet?

I have added some GeoJSON to my Leaflet powered map as below. (Altered version) var array_of_layers = L.layerGroup([]); var styleholder = []; var belgium_style = {color: "#d3e46f"}; var bosnia_style ...
0
votes
0answers
15 views

GeoJSON: line connecting features

How do I create a line connecting Features in GeoJSON? I hope to avoid having to re-enter coordinates for the polylines I use to connect the Features separately...
2
votes
3answers
195 views

json to xml transformation with x2js

I am trying to transform a JSON object to XML, but i have somehow get stuck in jscript (not an expert). Here is the code: ... var GEOJSON_PARSER = new OpenLayers.Format.GeoJSON(); var ...
2
votes
0answers
59 views

Developing workaround to arcpy.asShape truncating all values to 3 decimal points?

I've read a few questions\answers about converting a GeoJSON Shape into an ESRI Object. Unfortunately most of the answers pointed to decoding the dictionary's manually. Im a bit more lazy ^_^ The ...
1
vote
1answer
33 views

Click Events with Leaflet and geoJSON

How do I attach a click event to a geoJSON that then executes an Ajax function when clicked. I looked into onEachFeature but that executes when the geoJSON is loaded, not when clicked, thus executing ...
-1
votes
2answers
63 views

Convert shapely polygon coordinates

I am trying to work with a shapefile using shapely, fiona and python. The original coordinate system is in latitude and longitude that I am trying to convert to state plane system. So I want an ...
1
vote
1answer
57 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 ...
1
vote
2answers
2k 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, ...
1
vote
1answer
36 views

GeoJson based on shapefile : large coordinates

I'm quite new to GeoJson (for use with d3), and in need of some help. When I convert my available shapefile (.shp) with ogr2ogr to a GeoJson-file, the resulting coordinates are very big numbers (in ...
5
votes
1answer
186 views

Conventions for returning GeoJSON via an API

I have a queryable API that returns one or more GeoJSON FeatureCollections. Currently the response looks something like this: { "success": { "data": { "layer1": {"type": ...
1
vote
1answer
357 views

How to export a geojson file with correct order of coordinates?

I was testing rendering of data via GitHub in geojson format, because I wanted to use it for INSPIRE data. INSPIRE data are in GML 3.2.1 format. I've downloaded one of datasets from ...
6
votes
2answers
504 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 ...
0
votes
2answers
46 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 ...
0
votes
2answers
92 views

Using AJAX to run PostGIS SQL statements and display results via GeoServer

I am learning Web GIS, and I can't find a good example that gives a big picture of a web interface of running spatial analysis using PostGIS. What I am looking for is a graphical/GIS version of ...
5
votes
3answers
425 views

Can we merge shapefiles with different geometries (point and polygon) to get a single layer which shows both geometries?

I want to merge two shape files in which one is of point geometry type and other is polygon type in order to get a single layer containing both points and polygon in a single map.
0
votes
1answer
135 views

ogr2ogr GeoJSON GeometryCollection

All, I have a Postgres/PostGIS DB with two geometries in a single table. I want to export them as a GeoJSON GeometryCollection (see here) but I can't seem to get the GEOMETRY_AS_COLLECTION layer ...
1
vote
0answers
29 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. ...
0
votes
1answer
128 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? ...
5
votes
2answers
106 views

Can QGIS give GeoJSON layers a meaningful default name?

When I add a GeoJSON layer to my QGIS project, it always gets the name OGRGeoJSON. This is in contrast with shapefile layers, which seem to be named after the file name by default. Is there a way to ...
0
votes
1answer
419 views

Read GeoJSON with openlayers

I generated a GeoJSON a projected table in EPSG: 4326 domeu postgis SELECT ST_AsGeoJSON(geom) FROM "onibus" I put in the www folder on my server I'm running geoserver locally my pages are also in ...
0
votes
1answer
57 views

Geopandas/folium map not displaying

Good afternoon, I'm trying to use a combination of geopandas, pandas and folium to create a polygon map that I can embed incorporate into a web page. For some reason, it's not displaying and wonder ...
1
vote
2answers
38 views

GeoJSON from OpenStreetMap with bike routes of a city only?

How can I get (if it's possible) a GeoJSON from OpenStreetMap with bike routes of a city only? I have to say that I'm pretty new with the all the map/geo language. But as a developer I'm ...
0
votes
1answer
326 views

Issue with a point insertion into a Geoserver points layer. WFS-T

How is the best way to insert a feature from the client side into an existing GeoServer layer? Maybe using an ajax call and JSONP? Or OpenLayers (i can't figure out how to have the proxy working)? ...
1
vote
0answers
40 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 ...
1
vote
2answers
71 views

Open Source solution to batch process shortest distance between points along road networks?

I have the locations geocoded (a fairly small dataset, ~200), but I haven't found a straightforward way to load these data into QGIS and perform network analysis between nodes. Any suggestions? ...
1
vote
2answers
236 views

Printing possible for openlayers GeoJson WFS with Mapfish printing service and wkhtmltopdf?

I searched lots of places but I couldn't find proper examples or documentation to do printing using Mapfish Printing service or Wkhtmltopdf. My application has a few WFS layers from openlayers and ...
2
votes
1answer
46 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 ...
5
votes
0answers
110 views

How to add an attribution on a GeoJSON Layer from Leaflet?

I need to use a GeoJSON Layer on my Leaflet map. Here is a sample of my code: function onEachFeature(feature, layer) { if (feature.properties && feature.properties.popupContent) { ...
1
vote
1answer
51 views

Problem with Leafletjs and GeoJSON

I am new to Leafletjs and I am trying to figure out how to plot a polyline on a map using a geoJson object. I've gotten as far as getting a map, making it centered on a given lat/long and setting the ...