Is there any way we can query and get location data using mongodb geospatial query that matches the following criteria?   Getting all locations that are part of intersection between two boxes or in general two polygons.   For example below can we get...
When loading many feature footprint vectors onto the map, the openlayers map and web application becomes unresponsive.  Is there any way to improve the performance of the openlayers map with many vectors?    We would like to be able to support at le...
How can I perform a query on the database as per the user's location value? The application was developed with HTML5, CSS, Javascript, PHP has a database with columns as in the below table.    On the html webpage the users geo coordinates are col...
I have this dataset which has ellipses, more specifically ellipse "envelopes." I was wondering if someone had advice on how I could draw these on a D3 map. I already have a map setup with mercator projection. This stackoverflow answer has a c...
I am attempting to run a Geo Box query using Mongoose however do not get any results. I have built out a simplified test case:  var mongoose = require('mongoose');  // Schema definition var locationSchema = mongoose.Schema({     userid: { typ...
I have a line segment (great circle part) on earth. The line segment is defined by the coordinates of its ends. Obviously, two points define two line segments, so assume I am interested in the shorter one.   I am given a third point, and I am looking...
Using d3's pack layout, I made some bubbles associated with states. Current test script: https://jsfiddle.net/80wjyxp4/4/. They're colored according to region. You'll note Texas is in the "NW", California in the "SE", etc....
plotBaseLayer (data) {     this.setState({ data: data })      const baseFeatures = []     let baseLayer = Object()      Object.keys(data.features).forEach((key) => {       const basePoints = new olFeature({         geometry: new olGeomPoint(olPr...
I am trying to create an offline map through the following steps:   Download data from Natural Earth Data Convert the shape files to GeoJSON Add the GeoJSON files as layers in OpenLayers3   I am struggling to get the rivers right, I can display them,...

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