So I've tried this a bit, but I can't get it to look quite right.
What I was doing up until now was taking the center point of the
geohash cell as location for the value I am getting from the index.
Doing this you end up with what appears to be islands (using
HeatMap.js currently). I guess what I
Yeah I'll have to play to see how useful it is, I really don't know at
this point.
On another note we already using some binning like is described in teh
wiki you sent, specifically http://code.google.com/p/javageomodel/ for
other purposes. Not sure if that could be used or not, guess I'd have
to
Yes it looks interesting and is not too difficult to do.
However, the length of the geohashes gives you very little control on the
size of the regions to colorize. Quoting wikipedia :
geohash length
km error1
±25002
±6303
±784
±205
±2.46
±0.617
±0.0768
±0.019
This is interes
If you look at the Stack response from David he had suggested breaking
the geohash up into pieces and then using a prefix for refining
precision. I hadn't imagined limiting this to a particular area, just
limiting it based on the prefix (which would be based on users zoom
level or something) allow
There is definitely something interesting to do around geohashes.
I'm wondering how one could map the N by N tiles requested tiles to a range
of geohashes. (Where the gap would be a function of N).
What I try to mean is that I don't know if a bijective function exist
between tiles and geohash rang
so it sounds to me, that the geohash is just a hash representation of lat,
lon coordinates for an easier referencing (see e.g.
http://en.wikipedia.org/wiki/Geohash).
I would probably start with something easier, having bbox lat,lon
coordinate pairs of top left corner (or in some coordinate systems,
That is certainly an option but the collecting of the heat map data is
really the question.
I saw this
http://stackoverflow.com/questions/8798711/solr-using-facets-to-sum-documents-based-on-variable-precision-geohashes
but don't have a really good understanding of how this would be
accomplished.
I'm not entirely sure, that it has to be that complicated .. what about using
for example http://www.patrick-wied.at/static/heatmapjs/ ? You could collect
all the geo-related data and do the (heat)map stuff on the client.
On Sunday, June 10, 2012 at 7:49 PM, Jamie Johnson wrote:
> I had a req
I had a request from a customer which to this point I have not seen
much similar so I figured I'd pose the question here. I've been asked
if it was possible to build a heat map from the results of a query. I
can imagine a process to do this through some post processing, but
that sounds very expen
