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Questions tagged [geojson]

GeoJSON is a geospatial data interchange format based on JavaScript Object Notation (JSON)

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Searches by area names in OpenLayers with request of AJAX in the PostGIS database

We built a GeoJSON: {"type":"FeatureCollection","features":[{"type":"Feature","id":0,"geometry":{"type":"Polygon","coordinates":[[[669023.843,415221.025],[669031.588,415222.415],[669059.365,415154....
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2answers
24 views

Reading a GeoJSON via Java GeoTools API issue

I'm trying to read this GeoJSON from this string: { "type": "FeatureCollection", "features": [ { "type": "Feature", "geometry":...
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1answer
27 views

How to repeat drawing function in Leaflet

I am trying to create a Leaflet.js web map that gives users the opportunity to draw lines. this line will be sent to mapquest elevation API to be retun to the map as a GeoJSON with elevation data ...
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2answers
33 views

Mapserver GeoJSON input

Is it possible for MapServer to read GeoJSON file and serve it as a layer in the .map file? Like how it can be done with shapefiles as shown below: LAYER Name 'land' TYPE POLYGON DATA '...
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25 views

Converting L.GeoJSON Leaflet to different projection?

so I have some awesome basemap raster layers that use L.TileLayer to load, but the GeoJSON I have for my country polygons is all Web Mercator. My tile map is WGS84 or EPSG4326 (I think). But I ...
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25 views

Editing attributes of a GeoJSON in Leaflet

I have a map in which I'm trying to create the capabilities of adding new features and editing attributes of new and existing features. I have managed to make the feature editable but I want people to ...
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1answer
33 views

OpenLayers 5 and GeoJSON with two geometry attributes per feature

I have a GeoJSON file in which each feature has two geometry attributes, one is the default geometry property defined by the GeoJSON standar, and the other one is a property under the standarized ...
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28 views

Using QGIS or GRASS API in custom application

I've already read in this link that is not possibile to use QGIS or other GIS application API (GRASS, ArcGIS) without rebuild all libraries into my custom code. First I would like to know if that ...
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8 views

Android laggy map after adding vector objects

I'm using GLMap to render over 5000 vector objects in an Android Application. Here is the framework I'm using: https://getyourmap.com/ Currently, I have Shapefiles which I convert with https://...
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14 views

Looping on GeoJSON to get maximum/minimum altitude

I need to create to create 2 function to return max and min Z/elevation/altitude values from LineString GeoJSON file. i have created 2 function to get that before, but i was using MultiLineString ...
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0answers
55 views

Increase the size of overlapping lines in QGIS 3.6

In QGIS I have a layer that is a MultiLineString that has many overlapping lines, which represent driving routes around the city which are generated using OSRM. My data looks something like [ [[a,b],...
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26 views

Creating Leaflet Heatmap using LinsString GeoJSON

I need to create heatmap based on length property from a LineString GeoJSON file. I have tried to use Leaflet.heat plug-in, but this tool accepts points not lines. here is my code: $.getJSON("data/...
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36 views

Put a label on OpenLayers from GeoJSON

I have a geojson and I want every property to put a label in its middle with a number .. Here's the function I'm putting on the geojson map: function search(){ var layer = $('#layer').val(); ...
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1answer
74 views

Converting JSON response into a GeoJSON layer in my Leaflet map

I need to convert a JSON response from Mapquest elevation API into a GeoJSON layer in my Leaflet map. var ele = $.getJSON('http://open.mapquestapi.com/elevation/v1/profile?key=<API_KEY>&...
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49 views

Export GPX files from a Leaflet.js map

I have a Leaflet.js map that contains tools for users to draw lines, i need to create an option to export lines in GPX format. I have used (togpx) plug-in to convert drawn GeoJSON to GPX to download ...
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1answer
48 views

Leaflet: Different custom information popups for each GeoJSON polygon

I'm really new to this and I'm trying to create popups for 2 polygons which will each contain a paragraph of written information. The function I have so far differentiates between the 2 polygons by ...
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31 views

View GeoJSON data after clicking on the OpenLayers map

I'm trying to make a piece of code that when I click on the map to return GeoJSON property data that I clicked on. I tried this way: map.on('click', function(e){ //console.log(evt); //...
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1answer
22 views

Request a Ajax with GET to remove one or more geometries in OpenLayers

I have a html selection of the form: <table class="table"> <tr> <td> <label>Afiseaza:</label><br /> <select id="layer" onchange=...
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23 views

Android Library to convert ESRI Shapefiles to GeoJSON

I'm building an Android App for display ESRI Shapefiles but unfortunately, there are only a few free SDKs which support Shapefiles. Most of them working with GeoJSON, so now I'm looking for an Android ...
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1answer
13 views

Loading GeoJSON by AJAX method in OpenLayers, centering the map automatically

I'm trying to center the map on the geometries that are on the map. To encompass all but until now I have not succeeded in how ... It centers further than geometries :( if (ol.proj.proj4 &&...
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1answer
23 views

Find index of Linestring element at feature, when hovering - openlayers/GeoJson

I have a Geo-JSON Linestring, this is drawn by 800 elements in OpenLayers 4.6.5. I'am trying to use the map.forEachFeatureAtPixel, and print a pop-up when hovering for individual elements on the ...
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1answer
40 views

Search plugin of Folium doesn't appear [closed]

I'm trying to reproduce the following jupyter notebook : https://nbviewer.jupyter.org/github/jtbaker/folium/blob/geojsonmarker/examples/plugin-Search.ipynb But once I'm trying to create the map I ...
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48 views

Leaflet custom icons and popups showing GeoJSON properties with external data?

How can both custom icons and geojson properties be implemented with external geojson in Leaflet? Using methods described in answers to two other questions, both using inline geoJSON: Using custom ...
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2answers
33 views

Executing functions after multiple data sources have been loaded in Leaflet AJAX

I have a leaflet map that takes in data from multiple sources via the LeafLet Ajax plugin. I want to execute certain functions only after ALL the data has been loaded, not just one layer. The data ...
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1answer
50 views

Calculating gained elevation on GeoJSON

I need to calculate gained elevation on Multilines GeoJSON files in a Leaflet.js map. Is there is any plug-in to do that? My GeoJSON files contains Z/elevation data in geometry.
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1answer
35 views

Convert GeoJSON object to bounding box using Python 3.6

Is there a library available in Python 3.6 using which I could convert a GeoJSON object (geometry) into a bounding box object? Actually I am calling a WMS layer from GeoServer and I want to set the ...
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36 views

Getting Details of POI

I am pretty new with this so please bear with me. I am able to extract GeoJSON data from OSM and Load it into MongoDB. I am able to run queries to get the data based on Radius. The data looks ...
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2answers
51 views

Getting hightest and lowest points

I have GeoJSON files that contains altitude values. I have used these GeoJSON files to be shown on leaflet.js web map. I need to show values of highest and lowest point in two divs when I clicking on ...
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1answer
37 views

CORS issue loading an external local GeoJSON into OpenLlayers 5

I have a local folder on my network with my HTML file and two subfolders, one with the downloaded folder from OpenLayers (renamed ol) and the other with my GeoJSON file (data). When I try to load the ...
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3answers
102 views

Filtering interactive leaflet-map with dropdown-menu?

I try to set up a filterable "shot chart" like http://graphics.latimes.com/kobe-every-shot-ever/ with leaflet. I've a geojson file thats stores all the shots data, I've them showing up in a layer. ...
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1answer
41 views

Leaflet: how to select a feature by property

I have a geojson layer with continents info (got it from here), and I want to select a feature(continent) based on its name value or "CONTINENT" in this case. I did some research and ended up with ...
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1answer
46 views

How can I get GeoJSON from Esri software to load in Leaflet?

So I am trying to take a GeoJSON file that I have generated from an Esri shapefile in ArcGIS Pro, but it is not rendering on the map for some reason... The GeoJSON that was created from ArcGIS Pro is ...
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1answer
77 views

Load multipolygons from GeoJSON into GeoDjango model

I have a simple model: from django.contrib.gis.db import models class CountryShapes(models.Model): geonameid = models.PositiveIntegerField(primary_key=True) geom = models.MultiPolygonField() ...
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3answers
158 views

I'm trying to add my local GeoJSON files to my Leaflet web page

I'm quite new to JavaScript and I have been trying to add my GeoJSON files to a web page. I can't seem to figure out how to get the GeoJSON to actually load. I've checked it using GeoJson.io and it ...
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1answer
57 views

Is it possible to use SELECT ST_GeomFromText( with other SELECT? [closed]

I'm trying to use SELECT ST_GeomFromText() with a value catched from another query: SELECT ST_GeomFromText( ST_AsText( ST_GeomFromGeoJSON( SELECT column-name FROM table-name ORDER BY ...
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1answer
83 views

Converting GeoJSON to shapefile using GeoTools Java

I am implementing a web service in Java which takes a GeoJSON file as input and converts it into a shapefile. My code looks something like this :- @RequestMapping(value = "/uploadFile", method = ...
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1answer
21 views

Why is this happening? I show GeoJSON some coordinates with OpenLayers by request Ajax

I want to display a GeoJSON on OpenLayers with a request from Ajax from the database: I store in the geojson variable all the information and I icercated in two ways: 1. Directly from the already ...
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2answers
212 views

GeoJSON to KML conversion

Is it possible to convert GeoJSON to KML format using geotools. I am trying to figure out this using Java but I can get results only using node js.
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1answer
89 views

Importing GeoJSON into PostGIS with Python

I am trying to import GeoJSON file with Python to my PostgreSQL db. Here is full code: with open('C:/xampp/htdocs/app/data/'+a) as file: gj=geojson.load(file) for feature in gj['features']: geom=...
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2answers
118 views

Get GeoJSON from a database by the AJAX method for OpenLayers

I have this code: if (ol.proj.proj4 && ol.proj.proj4.register) { ol.proj.proj4.register(proj4); } var features = new ol.format.GeoJSON().readFeatures( $.ajax({...
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2answers
126 views

Create Polygon with Length, Width, and a center coordinate

Using Shapely or like library, How can I create a rectangular polygon with known Length, Width (in meters)(Drawing over EPSG: 3857), and center coordinates (EPSG: 4326)? The output needs to be in ...
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2answers
60 views

Convert GeoJSON to OSM XML using Python

I know about using ogr2ogr, and also about the nodejs module osm_geojson. However, I would like to convert GeoJSON to OSM XML from Python. Is there a library which has this capability built in? Or ...
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1answer
36 views

Using L.Control.Search and L.markerClusterGroup

I am trying to use L.Control.Search and L.markercluster to make a searchable cluster of ~4400 address points. I have tried two separate ways (based on examples I have found) but not yet been ...
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0answers
20 views

Dissolving GeoJSON with nodes and lines to one average line?

I have a GeoJSON with two layers. One with lines and one with nodes. I'd like to dissolve it (or at least the layer with the nodes) to one single line, by averaging the positions. I've looked at Turf....
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1answer
40 views

Updating onEachFeature property of GeoJSON in Leaflet?

Here's my code: var eurojson = L.geoJSON( eurojson,{ onEachFeature: onEachFeature, style: EU_color }); var econjson = eurojson; econjson.setStyle(Econ); When I initialize econjson variable, I ...
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0answers
35 views

Converting TopoJSON data to GeoJSON using JavaScript in browser?

There are many articles about how convert GeoJSON to TopoJSON using JavaScript, but I could not find how to convert TopoJSON to GeoJSON in the browser. Response: Using http://d3js.org/topojson.v1....
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1answer
28 views

How can I add dynamic text/properties to a GeoJSON multipoint on each individual feature?

I'm drawing circles on a map based on lon/lat. These circles are drawn from "subarrays" in an array, e.g: myArray = [[array(18)]],[array(111)], [array(65)]....] I map each of these arrays using ...
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1answer
59 views

Coordinates remain very high when converting projections

I have this GeoJSON file which uses the following projection: EPSG:28992. I want to convert this to EPSG:3857 but I don't have GIS software available. I have tried ogre, but when I first convert it to ...
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1answer
65 views

Highlighting selected geojson feature and return to previous state when another one is selected using Leaflet?

I've a map with a geojson layer containing markers, polygons and lines. I made a module so that when a feature is clicked, its properties are displayed in a frame and not in standard Leaflet popup. ...
2
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1answer
81 views

How to snap to a geojson-vt layer (Vector Tile Layer)?

I'm using geojson-vt to render a large geojson (originated from OSM) file. This file contains all road from a state (extracted with overpass-turbo way[highway="*"]). I'm buinding a domain-specific ...