An open geographic data format based off of JavaScript Object Notation

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7
votes
0answers
222 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) { ...
3
votes
0answers
933 views

How can a leaflet SVG overlay be placed outside of the leaflet-overlay-pane?

I have SVG on top of GeoJSON in my map. How can a leaflet SVG overlay be placed outside of the leaflet-overlay-pane while keeping GeoJSON in place in the leaflet-overlay-pane? (For example, how could ...
3
votes
0answers
45 views

simple raster format to use in Web applications?

I'm building a Web application in which users create and edit very coarse raster data. They're assigning values to cells in a georeferenced grid. Right now I'm storing the values in a multidimensional ...
3
votes
0answers
444 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 ...
3
votes
0answers
167 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 ...
3
votes
0answers
135 views

GeoJSON support in ArcObjects 10 .NET

i am currently trying to build a geoprocessing application using OpenLayers and ArcObjects, I have some features that user draws on openlayers and i need to send these features to arcobjects for ...
2
votes
0answers
13 views

Using Extjs 5 & OpenLayers 3

To consume geojson data from a REST HAL CORS webservice, in client side i'm using ExtJs 5, but to map data having geometries i'm stuck between choosing geoExt2 which has a branch based on extjs5 and ...
2
votes
0answers
47 views

How to get Geography data to GeoJSON in PostgreSQL?

I am using PostgreSQL database and there is a field in a table(area), i.e., public.geography(Points,4326). It contains below type of records "0101000020E6100000BA83D89942334540780B24287ED051C0" I ...
2
votes
0answers
57 views

How to load GeoJSON into PostgreSQL database using Python?

What I have tried to do is (In Python IDLE): import psycopg2 import json try: conn = psycopg2.connect("dbname='carto' user='postgres' host= localhost password='password'") except: print "I am ...
2
votes
0answers
73 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 ...
2
votes
0answers
86 views

Using OpenLayers' Refresh strategy for GeoJSON

I am trying to use the Refresh Strategy reading a GeoJSON file in OpenLayers, however it doesn't work (but it works perfectly using for instance .Fixed() strategy), here is my code: var ...
2
votes
0answers
141 views

Getting JSON/JSONP/GeoJSON from GetFeature WFS request to ArcGIS for Server?

I'm trying to perform a GetFeature request to an ArcGIS 10.2.1 for Server WFS service and would like to get response in geoJSON format. If I look at the GetCapabilities from the service the only ...
2
votes
0answers
77 views

ogr2ogr does NOT save “styles”, say “color”, information; how do I get around it?

I'm using ogr2ogr to convert KML to GeoJSON and I'd like to extract style information along with the data. The bash script I am using is: filekml="/tmp/poly.kml" filegeojson="/tmp/poly.geojson" ...
2
votes
0answers
52 views

Stray horizontal lines after converting from GeoJSON to topojson

After converting a GeoJSON file to topojson, and loading the topojson into Leaflet, stray lines appear in the resulting map. Like this: What is causing this? If I view the GeoJSON, these stray ...
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 ...
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
77 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
0answers
248 views

Z-Index in GeoJSON features using leaflet

I have a watershed polygon with sub-watersheds contained within the larger watershed. I would like the sub-watersheds drawn on top. Can i control the drawing order of features within a geojson object ...
2
votes
0answers
216 views

How to add an offset to a GeoJSON layer in Leaflet?

Using the example GeoJSON tutorial code at leafletjs.com. Change the myLines variable so that the two lines overlap, but run in opposite directions as follows: var myLines = [{ "type": ...
2
votes
0answers
952 views

Geoserver WFS get feature doesn't work - “SyntaxError: missing ; before statement”

I'm trying to use geoserver WFS json for creating vector layer (instead of using WMS) because this is a layer I redraw every 20 seconds. This is the code I use : function getJSON() { var ...
2
votes
0answers
190 views

Show geoJSON properties in jQuery Mobile Panel

First off I'm a novice at JS so please bear with me if this is a simple task to complete. I'm currently using the stock LeafletJS popup bubble to display the properties from my geoJSON. However, I ...
2
votes
0answers
299 views

R, GeoJSON and Leaflet

I recently learned about leafletjs.com from an R-Bloggers.com post. One such tutorial that I would like to achieve is to create interactive choropleth maps with leaflet. I have been using the rjson ...
1
vote
0answers
14 views

combine multiple geojsons

I have several geojsons which contain polygons. But the polygons are reaching over other geojsons. When I import them into lets say Qgis, the polygons, which are distributed among several geojsons are ...
1
vote
0answers
60 views

Saving data in OL3

I have a small app where I would like to be able to digitize new features and save them for use outside the app. I am using geojson as I don't have a geoserver I have managed to create a button that ...
1
vote
0answers
23 views

OpenLayers 2: Transform the geometries for a list of feature objects

I am trying to export GeoJSON for a list of feature objects. The features are in EPSG:3857 projection and I would like to convert all geometries to EPSG:4326. I am perfectly capable of doing this by ...
1
vote
0answers
32 views

GeoJSON to routing graph

What are the best automated ways of placing the nodes and edges of a routing graph using the GeoJSON data of a multi-level building? What other data is needed (area layout, accessor directions etc)?
1
vote
0answers
49 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 ...
1
vote
0answers
41 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. ...
1
vote
0answers
64 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
0answers
35 views

Export isochrones to images

I'm looking for automated/scripted ways to generate PNG images based on GeoJSON multi-polygons. I have multiple polygon isochrones for a given starting point, e.g. 10 minutes, 15 minutes, 30 minutes, ...
1
vote
0answers
156 views

How to get feature on vector layer in Openlayers 3?

I'm try to get feature of a vector layer, but I'll have 3 or more Vector layer. When I click the map, I didn't get the feature. My vector layer definition; var vectorAltAlan = new ol.layer.Vector({ ...
1
vote
0answers
138 views

leaflet layer control checkbox options min/max

I have a straight forward leaflet map that is on a webpage. I am using the angular-leaflet-directive and all works as expected except for the layer control box. When only one baselayer is specified I ...
1
vote
0answers
76 views

How to change color of points dynamically from a geoJson in openlayers

I am new in Openlayers and what I am trying to do is to dynamical give a color to some points read by a GeoJSON file. I am taking inspiration by this post How can I add an infowindow to an ...
1
vote
0answers
152 views

Attribute search in Leaflet

I have added the attribute search plugin to my leaflet map, but I cannot use in the correct way. Somehow my script loads the GeoJSON features two times. The first are the styled markers, the attribute ...
1
vote
0answers
117 views

Formatting Google Places API GeoJSON and Import to QGIS?

Hi Stackexchange I'm trying to export JSON or XML data to my desktop and import it to QGIS. This is the URL I'm using but it appears to be incorrectly formatted: ...
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
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 ...
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 ...
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 ...
1
vote
0answers
52 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 ...
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
0answers
53 views

GeoJson attributes encoding limitation

I have problem when trying to encode attribute values in latin1 using ogr GeoJson driver. Accent char are not displayed correctly. Is the geoJson encoding is limited to UTF-8? I cant find any info ...
1
vote
0answers
65 views

mongoDB query not working as expected

My mongoDB collection has all three types of shapes. A point is stored as { 'CE_NO': '_', 'E_NAME': 'RAILWAY BOOKING CENTER', 'SRCTYPE': 'Facility', 'geom': { 'coordinates': [ ...
1
vote
0answers
133 views

django---error in displaying data and displaying it on the map

. i am trying to display a feature queried from postgis. . i also designed a user input field to enter the id of the desired feature to be displayed. . i have already queried the attributes first ...
1
vote
0answers
578 views

Access-Control-Allow-Origin problem when loading json file from Amazon S3 to display in OpenLayers

This is my code for displaying geojson in OpenLayers, where "geourl" is directed to a json file in Amazon S3. geojson_layer = new OpenLayers.Layer.Vector("GeoJSON", { strategies: [new ...
1
vote
0answers
108 views

Possible to rollback from QGIS 2.0.1?

I'm running Ubuntu 12.04 LTS. Unfortunately Ubuntu has automatically upgraded my QGIS from 1.8 to 2.0.1. And 2.0.1 which creates GeoJSON files that OpenLayers cannot parse. Would be best for me to ...
1
vote
0answers
750 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
0answers
406 views

translating and scaling viewport to fit geojson map in D3js

I am trying to load a map of Rio de Janeiro (Brazil) in GeoJson for with D3js the code and the map is here: https://gist.github.com/4157853 I can open the map normally with Qgis, but with d3js ...
1
vote
0answers
868 views

searching GeoJSON features

After googling for many days and reading the OL documentation, I don't understand well how the filterToParams in OpenLayers.HTTP protocol should work, what I'm trying to do is to find and display the ...