An open geographic data format based off of JavaScript Object Notation
0
votes
2answers
71 views
Can't read returned geojson
I've got a function that takes an Openlayers mouse click and puts the click location into a SQL statement which then gets passed to a JSP script which runs the SQL statement on the PostGIS database ...
4
votes
1answer
214 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 ...
1
vote
1answer
121 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 ...
1
vote
1answer
138 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
1answer
24 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 ...
0
votes
1answer
92 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 ...
0
votes
1answer
20 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
1answer
94 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 ...
-2
votes
1answer
24 views
Render specific vector data from database with openlayer
I want to render some data on a map. They are stored as points in my database (postGiS), each one is associated with a name. I want to render points with the same place name in the same color.
...
3
votes
0answers
58 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
91 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
20 views
Display GeoJSON layer on top a SVG image instead of a map.
I'm very new to GIS, so hope this is the correct place to ask. Not sure if this will even be possible.
This is what I want to achieve:
In short, I want to display a set of polygons, lines etc. in a ...
2
votes
0answers
49 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 ...
1
vote
0answers
40 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 ...
1
vote
0answers
63 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.
...
1
vote
0answers
183 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
235 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
457 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 ...
1
vote
0answers
252 views
Vector layer shifted on OSM map: why?
I've defined the following map:
Proj4js.defs["EPSG:31258"] = "+proj=tmerc +lat_0=0 +lon_0=13.33333333333333 +k=1 +x_0=450000 +y_0=-5000000 +ellps=bessel ...
1
vote
0answers
63 views
how to see multiple features from GeoJSON
In Pablo's answer:
Open a GeoJSON file with QGis
He says he 'imported each type at a time'.
How do you do that? I am working with a GeoJSON file
that has a mixture of points and polygons, but
points ...
1
vote
0answers
113 views
How to show an array of 2d points/polygons in Polymaps (Cartesian coordinate system)
I need to display these 2d points/polygons (Cartesian coordinate system) on Polymaps with GeoJson layer.
I do not use the other layers.
Do I need to convert xy coordinates to the lat lon? If so, how?
...
0
votes
0answers
13 views
How to put markers from geoJson to MarkerClusterGroup?
How to put markers from layer WTGS (which reads geojson from php file returned from postgis database) to L.MarkerClusterGroup?
WTGS = new L.geoJson(null, {
pointToLayer: function ...
0
votes
0answers
18 views
Extract polygons from embedded Google Map for QGIS
Total GIS amateur here assembling a map using QGIS for output to Adobe Illustrator...
I'm attempting to project the shapes from the map on this page: http://www.americanwineryguide.com/ onto my ...
0
votes
0answers
65 views
How do I add elevation data to a GeoJSON line from a GPX file?
I understand that elevation can be added as an optional third value in Coordinates (lat, long, elev) in a geojson file, but I can't find a way to actually do that from a gpx file. I've used ogr2ogr to ...
0
votes
0answers
26 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 ...
0
votes
0answers
92 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. ...
0
votes
0answers
30 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 ...
0
votes
0answers
106 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 ...
0
votes
0answers
84 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:
...
0
votes
0answers
116 views
Loading geojson like map tiles in modestmaps
I have a map that's using modestmaps.js quite nicely so far. However, under my naive implementation around 200kb of data is loaded at each zoom level to be rendered as markers (it's in geoJson, but ...
-1
votes
0answers
25 views
converting shapefile to geojson issue
I used qgis, to produce gejson files from four different shapefile, but only one of these is working, can you tell me what could be wrong with this operation?
