geospatial

问题 Is there a way to implement something like "inverse" geospatial search with Lucene? With inverse I mean, the indexed objects each define both a position (lat/lng) and a radius. I want to find all objects where my search position is within the radius of the indexed objects. A real life example could be a set of pizza delivery services, each of them delivers an area of radius x. I want to find all pizza services that could deliver a pizza to me. So, it is not me defining the search radius, it

问题 I have an array of latitude/longitude coordinate pairs that represent a polygon. I'm trying to determine the total area within that polygon. How would I go about doing that in Ruby? Here's an example array of the polygon: [[37.7663613767094, -122.452969210084], [37.7674219449606, -122.444718340349], [37.7701838510542, -122.445330289514], [37.7709974013834, -122.439159589248], [37.7700761930893, -122.438861402472], [37.7703501163684, -122.436868738421], [37.7712650571321, -122.437078116573],

问题 I am dynamically generating a WKT LineString between points in a map layer being generated for display in OpenLayers. I'd like to make the lines between the points curved, and I'd like to be able to dynamically change the curvature based on various input variables. This is for a network monitoring app, and we'd like the curvature to based on delay times between the points (not the raw delay itself, but the deviation from "normal" values during a given time period). While some GIS app and

问题 Been hunting through previous questions on Geocoding and while many are helpful I'm not finding one to my needs. I need to group multiple addresses to the nearest city centers. My only address information is city, country, and state (if applicable). For example, all addresses in San Francisco and within miles should be listed as San Francisco. I'll need to know the count of addresses rolled-up to San Francisco. I'm open to suggestions on how to approach this. I don't particularly want to

问题 I'm new to geospatial stats and can't figure out a simple question: I have two datasets with spatial coordinates. One has coordinates of hospitals and clinics in a particular district. The other has coordinates of all households in that district. Here's some mock data hospital_coord <-data.frame(longitude = c(80.15998, 72.89125, 77.65032, 77.60599), latitude = c(12.90524, 19.08120, 12.97238, 12.90927)) people_coord <-data.frame(longitude = c(72.89537, 77.65094, 73.95325, 72.96746, 77.65058,

问题 I apologize for the vague title, I really can't figure out a batter way to sum it up. Suggestions are more than welcome. I'm working on a project that really doesn't NEED a google map, it'd just create extra overhead for this project. But, I can't figure out how to do this WITHOUT google maps... so far. If I were to place a graphical overlay of a floor plan into google maps, I could use a browser location to approximate a users position. For this, it's a VERY large place, so there's room for

问题 I want to use the over() function from the sp package in R . I assigne a CRS . #say that polygon is EPSG3857 (Web Mercator PROJECTION) proj4string(finalPolygon) <- CRS("+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs") and all seems good. str(finalPolygon) > ..@ proj4string:Formal class 'CRS' [package "sp"] with 1 slot > .. .. ..@ projargs: chr "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1

问题 I am working on location calculation in Java and MongoDB. I pass latitude and longitude to method and find nearest location from provided input. I am able to get Location name from my master table where i have all landmarks with latitude and longitude. My requirement is that i want to get location with distance using MongoDB - like 4Km from XYZ . MongoDB has Geospatial query and i am working on it. I can get mentioned input by running in command prompt by using db.runCommand({ geoNear : "data

问题 While trying to setup to use the Geospatial Index on MongoDB, I run into the error message that the location array is not in the correct format. This is my collection "test". { "_id" : ObjectId("4f037ac176d6fdab5b00000a"), "CorporateId" : "XYZ12345", "Places" : [ { "Location" : { "Longitude" : "50.0", "Latitude" : "50.0" }, "ValidFrom" : "2011-11-01 00:00:00", "ValidTo" : "2021-12-31 00:00:00", "itemCount" : "1" } ] } Once I run this code. db.test.ensureIndex({"Places.Location": "2d"}); I get

问题 I've been trying to integrate geospatial search into my rails app for a few days now, but keep getting this error when I run rake sunspot:solr:reindex RSolr::Error::Http - 400 Bad Request Error: ERROR:unknown field 'location_ll' Request Data: "<?xml version=\"1.0\" encoding=\"UTF-8\"?><add><doc><field name=\"id\">Place 1</field><field name=\"type\">Place</field><field name=\"type\">ActiveRecord::Base</field><field name=\"class_name\">Place</field><field name=\"location_ll\">42.348065,-71