Re: Intersect Circle is matching points way outside the radius ( Solr 4 Spatial)
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.orgwrote: 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) lt; DSMILEY@ gt;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.
Re: Intersect Circle is matching points way outside the radius ( Solr 4 Spatial)
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.
Re: Intersect Circle is matching points way outside the radius ( Solr 4 Spatial)
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) dsmi...@mitre.orgwrote: 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.
Re: Intersect Circle is matching points way outside the radius ( Solr 4 Spatial)
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) lt; DSMILEY@ gt;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.
