Yes Jeff, this is what I want to do. I wasn't sure if there was an easier way. What units does the distance function return? I tried this and it seems to return the distance in units of 10km, is this correct?
Thanks again! On Tue, Jan 31, 2012 at 9:04 PM, Jeff Heard <jefferson.r.he...@gmail.com>wrote: > Got it. So what you want to do is a list comprehension over the geometry > object, which *should* give you individual geometries is what it sounds > like. Then you can calculate distance() from each of these. Something > like this? > > interesting_point = Point(x, y) > collection = result.geom > min_dist = min([g.distance(interesting_point) for g in collection]) > > or for every geometrycollection in a queryset: > > result = MyModel.objects.all() > min_dist = min([min([g.distance(interesting_point) for g in coll]) for > coll in result]) > > Brute force and thus a bit slow, but it should work if I understand you > correctly... > > -- Jeff > > > On Tue, Jan 31, 2012 at 8:45 PM, Alex Kopp <loafer...@gmail.com> wrote: > >> Here's a more concrete example, say I am storing shapes of all >> countries. Now, the US can't be stored in one polygon (we have hawaii and >> alaska), therefore I have to store the many polygons in one >> geometrycollection. >> >> Now, say I have another point on the map, I would like to know how ar it >> is from ANY of the polygons... >> >> >> On Tue, Jan 31, 2012 at 8:41 PM, Alex Kopp <loafer...@gmail.com> wrote: >> >>> Perhaps I didn't explain it well, Jeff. I am just trying to get the >>> smallest distance from one point to any of the points, lines, or polygons >>> inside of a queryset. The data I am receiving from the queryset is a >>> geometrycollection already... That is how it is being stored in the >>> database. >>> >>> On Tue, Jan 31, 2012 at 8:36 PM, Jeff Heard <jefferson.r.he...@gmail.com >>> > wrote: >>> >>>> You should be able to create a geometrycollection object from a >>>> queryset (you may have to use a list comprehension for this), then >>>> calculate the centroid and take the distance from that. Taking the distance >>>> from the edge should only be a little more >>>> Complicated. Check the django GEOS API docs For complete details >>>> >>>> >>>> >>>> On Jan 31, 2012, at 6:36 PM, Loafer <loafer...@gmail.com> wrote: >>>> >>>> > I have a model that currently stores a Geographic Point (Using Django >>>> > GIS (GeoDjango)) and another model that has a field to store a >>>> > geometry collection (A collection of polygons, lines, and or points). >>>> > >>>> > I am trying to find the distance from the point to any one of the >>>> > shapes in the geometry collection. Apparently the distance function >>>> > only works on single shapes, not a collection. Are there any >>>> > workarounds to this? >>>> > >>>> > Any help is appreciated. >>>> > >>>> > Thanks. >>>> > >>>> > -- >>>> > You received this message because you are subscribed to the Google >>>> Groups "Django users" group. >>>> > To post to this group, send email to django-users@googlegroups.com. >>>> > To unsubscribe from this group, send email to >>>> django-users+unsubscr...@googlegroups.com. >>>> > For more options, visit this group at >>>> http://groups.google.com/group/django-users?hl=en. >>>> > >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Django users" group. >>>> To post to this group, send email to django-users@googlegroups.com. >>>> To unsubscribe from this group, send email to >>>> django-users+unsubscr...@googlegroups.com. >>>> For more options, visit this group at >>>> http://groups.google.com/group/django-users?hl=en. >>>> >>>> >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "Django users" group. >> To post to this group, send email to django-users@googlegroups.com. >> To unsubscribe from this group, send email to >> django-users+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/django-users?hl=en. >> > > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To post to this group, send email to django-users@googlegroups.com. > To unsubscribe from this group, send email to > django-users+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/django-users?hl=en. > -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
