How to use Lucene 4.0 Spatial API?


I cannot find any complete examples of how to use this API. The
code below is not giving any results. Any idea why?

/>static String spatialPrefix = "_point";
static String
latField = spatialPrefix + "lat";
static String lngField =
spatialPrefix + "lon";
public static void main(String[] args)
throws IOException {
SpatialLuceneExample spatial = new
SpatialLuceneExample();
spatial.addData();

IndexReader reader = DirectoryReader.open(modules.getDirectory()); /> IndexSearcher searcher = new IndexSearcher(reader);

searchAndUpdateDocument(38.9510000, -77.4107000, 100.0, searcher, /> module

It is possibile to to make query where max distance
dist is calculated dynamically, depending on what is a
field connected with a document being searched.


I mean
something like:


ctx.makeCircle(la, lo,
DistanceUtils.dist2Degrees(Min(100km,
currentDocumnet.getField("max_distance")),DistanceUtils.EARTH_MEAN_RADIUS_KM)) />

Instead of:


new
SpatialArgs(SpatialOperation.Intersects,ctx.makeCircle(la, lo,
DistanceUtils.dist2Degrees(dist,DistanceUtils.EARTH_MEAN_RADIUS_KM))); />

To get the results I want I'm doing some manual
filtering on my ScoreDoc:


Web Design

I cannot find any complete examples of how to use this API. The
code below is not giving any results. Any idea why?

/>static String spatialPrefix = "_point";
static String
latField = spatialPrefix + "lat";
static String lngField =
spatialPrefix + "lon";
public static void main(String[] args)
throws IOException {
SpatialLuceneExample spatial = new
SpatialLuceneExample();
spatial.addData();

IndexReader reader = DirectoryReader.open(modules.getDirectory()); /> IndexSearcher searcher = new IndexSearcher(reader);

searchAndUpdateDocument(38.9510000, -77.4107000, 100.0, searcher, /> module
Development Tools & Services

Assuming I have location-based 3D graphics (a 3D map) with matched
X/Y/Z coordinates. Is there a Web API or library that allows me to
build a navigation (rotating, zooming, etc.) application on top of
these graphics?


I looked into the Google Earth API, and
they indeed provide me with the exact functionality I need. The only
drawback is that I cannot replace their graphics with mine. Instead of
having an Earth, I want to have a relatively small, but well-detailed,
3D area.


I prefer a solution that uses open Web
technologies such as WebGL, and require no-plugins. But I'd love to
hear any solutions you might know of.

Web Design

does anyone have any experiences using the lucene's spatial search
component (lucene 3.0)?


I tried a very simple example but
could not get the search to return anything, see below for all the
codes


import java.io.IOException;
import
org.apache.lucene.analysis.WhitespaceAnalyzer;
import
org.apache.lucene.document.Document;
import
org.apache.lucene.document.Field;
import
org.apache.lucene.document.Field.Index;
import
org.apache.lucene.document.Field.Store;
import
org.apache.lucene.index.IndexWriter;
import
org.apache.lucene.index.Term;
import
org.apache.lucene.index.IndexWriter.MaxFieldLength;<
Programming Languages
Given the query example here:
http://www.hibernatespatial.org/tutorial-hs4.html Query query =
em.createQuery("select e from Event e where within(e.location,
:filter) = true", Event.class);query.setParameter("filter", filter);Is
it possible to rewrite the query using jpa 2 criteria api?( I am
unsure how i should deal with the within(e.location, :filter) part.
Programming Languages

I have a KML file which contains many latitudes/longitudes which
make up




around 500 odd polygons (approx 6,000 points are present).




I also have a sample file which contains




latitude and longitude for the entire area of say a particular
city.
(approx 10 million odd points latitude/longitude)




I have been going around Lucene Spatial
documentation from some time but I am unable to understand if it will
serve the following purpose:




a. To find for each point whether it lies inside some polygon or
not.
(effectively a point can be either inside or outside all of the
polygons) with close to 100% accuracy.




As of now, I have achieved this usecase by




implementing RayCrossing algorithm in Java




however




I am inclined to use Lucene




as I am already using it for number of other usecases. Additionally
RayCrossing algorithm is slow for such a huge number of points.



Please advise. Please point to some code samples which can get me
started on achieving the usecase if it's possible using Lucene.

Web Development

- Technology - Languages
+ Webmasters
+ Development
+ Development Tools
+ Internet
+ Mobile Programming
+ Linux
+ Unix
+ Apple
+ Ubuntu
+ Mobile & Tablets
+ Databases
+ Android
+ Network & Servers
+ Operating Systems
+ Coding
+ Design Software
+ Web Development
+ Game Development
+ Access
+ Excel
+ Web Design
+ Web Hosting
+ Web Site Reviews
+ Domain Name
+ Information Security
+ Software
+ Computers
+ Electronics
+ Hardware
+ Windows
+ PHP
+ ASP/ASP.Net
+ C/C++/C#
+ VB/VB.Net
+ JAVA
+ Javascript
+ Programming
Privacy Policy - Copyrights Notice - Feedback - Report Violation 2018 © BigHow