Hi David, Your latest response was lost in my inbox, I just realised it was there.
You are right, I am using Open Layers, and even though I use the mercator projection, there are elements that not adhere to that projection, in particular the polygon that generates the circle and the scale control. Precisely as you mention a circle drawn using the mrcator projection will look more enlarged when drawn close to the poles than it really is (just as Greenland) I mentioned multiple times to my team, the complexity was not in learning Open Layers but in grasping the concept of projections properly. Javier On 11 December 2012 16:28, David Smiley (@MITRE.org) <dsmi...@mitre.org>wrote: > Javier, > > I want to expand upon what I said; you might already get this point but > others may come along and read this and might not. > > Naturally you are using a 2D map as most applications do (Google Earth is > the stand-out exception), and fundamentally this means the map is projected > -- it has to be. There isn't a "right" (correct) projection, generally > speaking. Most/all web based map APIs are strictly "web mercator". If you > have a map GUI selection tool in which a circle is drawn, a perfect looking > round circle, then it's a lie unless you're looking directly at the > equator. > If the intent is for the user to draw a distance based circle, then ideally > your map tool should draw an elliptical looking circle if it's to be > accurate. This is why you got confused; you saw a circle yet the point > wasn't drawn in the circle because that circle *should have been* stretched > vertically to barely pass it. If on the other hand you intend for the > query > shape to be exactly what it displays to be (what appears to be a perfect > circle), even though this means the true geodetic shape is not a perfect > circle, then you could use geo="false" (and configure some other > attributes) > such that you are using standard planar math, not geodetic. Then your > query > shape would appear to work correctly but IMO its misleading over the first > option (draw an ellipse, not a circle). The circle misleads the user; it > mislead you. > > ~ David > > > Javier Molina wrote > > Hi David, > > > > As it happens the points are using the right projection, I can see them > in > > the same position using the page you just provided. > > > > There is something wrong with the radius of the circle though I need to > > investigate that but it is a relief to know that there is nothing wrong > > with Solr and that I didn't mix the concepts, it is just as in many cases > > the problem is somewhere else where you would never imagine. > > > > Thanks for the hint. > > > > Cheers, > > Javier > > > > > > > > > > > > On 11 December 2012 02:47, David Smiley (@MITRE.org) < > > > DSMILEY@ > > > >wrote: > > > >> Javi, > >> The center point of your query circle and the indexed point is just > >> under > >> 49.9km (just under your query radius); this is why it matched. I > plugged > >> in > >> your numbers here: > >> http://www.movable-type.co.uk/scripts/latlong.html > >> Perhaps you are misled by the projection you are using to view the map, > >> on > >> how far away the points are. > >> > >> FYI The default distErrPct of 0.025 should be fine in general and wasn't > >> the > >> issue. You should (almost) never use 0.0 on the field type because that > >> means your indexed non-point shapes (rectangles you said) will use a ton > >> of > >> indexed terms unless they are very small rectangles (relative to your > >> grid > >> resolution -- 1 meter in your case). Using distErrPct=0 in the query is > >> safe, on the other hand. > >> > >> Cheers, > >> David > >> > >> > >> > >> ----- > >> Author: > >> http://www.packtpub.com/apache-solr-3-enterprise-search-server/book > >> -- > >> View this message in context: > >> > http://lucene.472066.n3.nabble.com/Intersect-Circle-is-matching-points-way-outside-the-radius-Solr-4-Spatial-tp4025609p4025704.html > >> Sent from the Solr - User mailing list archive at Nabble.com. > >> > > > > > > ----- > Author: > http://www.packtpub.com/apache-solr-3-enterprise-search-server/book > -- > View this message in context: > http://lucene.472066.n3.nabble.com/Intersect-Circle-is-matching-points-way-outside-the-radius-Solr-4-Spatial-tp4025609p4025924.html > Sent from the Solr - User mailing list archive at Nabble.com. > > > >
