Hello:
I'm trying to get up on GeoDjango, but I can't get lookups to work at
all. All geographic operations via the GeoManager -- filter, exclude, get --
fail with the same error: "Operations on two geometries with different
SRIDs."
Strangely, though, I'm perfectly able to perform geometric operations
like "intersects," "touches," "contains," etc., outside the GeoManager. And
I'm pretty sure that the geometries in question don't have different SRIDs
because they come from the same model.
Here's a typical shell session. The first error listed is an IPython
error -- I don't think that's it, because it fails the same way in the plain
Python shell, but I'll leave it here in case I'm missing something.
Probably I'm doing something extremely boneheaded. Any ideas?
Thanks in advance,
Hank Sims
In [1]: from gistest.watershed.models import River
In [2]: river0=River.objects.all()[0]
In [3]: river1=River.objects.all()[1]
In [4]: river0.line.touches(river1.line)
Out[4]: True
In [5]: river0.line.srid
Out[5]: 4326
In [6]: River.objects.filter(line__touches=river0.line)
Out[6]:
---------------------------------------------------------------------------
<class 'psycopg2.ProgrammingError'> Traceback (most recent call last)
/home/hanksims/gis_projects/gistest/<ipython console> in <module>()
/var/lib/python-support/python2.5/IPython/Prompts.py in __call__(self, arg)
521
522 # and now call a possibly user-defined print mechanism
--> 523 manipulated_val = self.display(arg)
524
525 # user display hooks can change the variable to be
stored in
/var/lib/python-support/python2.5/IPython/Prompts.py in _display(self, arg)
545 """
546
--> 547 return self.shell.hooks.result_display(arg)
548
549 # Assign the default display method:
/var/lib/python-support/python2.5/IPython/hooks.py in __call__(self, *args,
**kw)
132 #print "prio",prio,"cmd",cmd #dbg
133 try:
--> 134 ret = cmd(*args, **kw)
135 return ret
136 except ipapi.TryNext, exc:
/var/lib/python-support/python2.5/IPython/hooks.py in result_display(self,
arg)
160
161 if self.rc.pprint:
--> 162 out = pformat(arg)
163 if '\n' in out:
164 # So that multi-line strings line up with the left
column of
/home/hanksims/gis_projects/gistest/pprint.py in pformat(self, object)
109 def pformat(self, object):
110 sio = _StringIO()
--> 111 self._format(object, sio, 0, 0, {}, 0)
112 return sio.getvalue()
113
/home/hanksims/gis_projects/gistest/pprint.py in _format(self, object,
stream, indent, allowance, context, level)
127 self._readable = False
128 return
--> 129 rep = self._repr(object, context, level - 1)
130 typ = _type(object)
131 sepLines = _len(rep) > (self._width - 1 - indent -
allowance)
/home/hanksims/gis_projects/gistest/pprint.py in _repr(self, object,
context, level)
193 def _repr(self, object, context, level):
194 repr, readable, recursive = self.format(object, context.copy
(),
--> 195 self._depth, level)
196 if not readable:
197 self._readable = False
/home/hanksims/gis_projects/gistest/pprint.py in format(self, object,
context, maxlevels, level)
205 and whether the object represents a recursive construct.
206 """
--> 207 return _safe_repr(object, context, maxlevels, level)
208
209
/home/hanksims/gis_projects/gistest/pprint.py in _safe_repr(object, context,
maxlevels, level)
290 return format % _commajoin(components), readable, recursive
291
--> 292 rep = repr(object)
293 return rep, (rep and not rep.startswith('<')), False
294
/usr/lib/python2.5/site-packages/django/db/models/query.py in __repr__(self)
106
107 def __repr__(self):
--> 108 return repr(self._get_data())
109
110 def __len__(self):
/usr/lib/python2.5/site-packages/django/db/models/query.py in
_get_data(self)
484 def _get_data(self):
485 if self._result_cache is None:
--> 486 self._result_cache = list(self.iterator())
487 return self._result_cache
488
/usr/lib/python2.5/site-packages/django/db/models/query.py in iterator(self)
187
188 cursor = connection.cursor()
--> 189 cursor.execute("SELECT " + (self._distinct and "DISTINCT "
or "") + ",".join(select) + sql, params)
190
191 fill_cache = self._select_related
/usr/lib/python2.5/site-packages/django/db/backends/util.py in execute(self,
sql, params)
16 start = time()
17 try:
---> 18 return self.cursor.execute(sql, params)
19 finally:
20 stop = time()
<class 'psycopg2.ProgrammingError'>: Operation on two geometries with
different SRIDs
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