I just add a 1000 to it, but in my rounding, I always make sure that I have 4
decimal places.
Here are some code snippets;
//indexing the lat
double lat = physicalAddress.getLatitude() + 1000.0;
Double latitude = new Double(lat);
document.add(new Field(Indexer.LATITUDE, latitude.toString(), Field.Store.YES,
Field.Index.UN_TOKENIZED));
//constructing the lat filter
Double minLatitude = new Double(sp.getInitialLatitude()
- deltaLatitude + 1000.0);
Double maxLatitude = new Double(sp.getInitialLatitude()
+ deltaLatitude + 1000.0);
RangeFilter latfilter = new RangeFilter(Indexer.LATITUDE,
getRound(minLatitude), getRound(maxLatitude), true,
true);
//my rounding function
public String getRound(Double value) {
int decimalPlace = 4;
BigDecimal bd = new BigDecimal(value);
bd = bd.setScale(decimalPlace, BigDecimal.ROUND_UP);
//r = bd.doubleValue();
String x = bd.toString();
log.debug("orig=" + value);
log.debug("value=" + x);
return x;
//System.out.println(r); // output is 3.15
}
----- Original Message -----
From: "no spam" <[EMAIL PROTECTED]>
To: [email protected]
Sent: Tuesday, February 27, 2007 11:09:04 PM (GMT-0500) America/New_York
Subject: Re: all records within distance -- small index
I just dug my book out. Chapter six shows a custom sort that implements a
SortComparatorSource combined with a TermQuery. I like the way that works
but I guess what I really need to do is a RangeQuery as well.
I have another large index that has 1.2 million docs. I use a query along
with a hit collector for that. I then get the lat/lon for each doc and calc
the distance there. I use some radian math to prevent the expensive great
circle distance first. I guess this is more expensive than your range query
above? I've indexed my docs with lat/lon encoded in a single field comma
separated. I still get < 1 second search times but I know there has to be a
better way.
Don't you have to multiply your lat/lon by 1000 to preserve decimal accuracy
and then calc your offset? Maybe it's late and I'm not thinking about this
right :)
Mark
