Eric
I'm not sure I understand what you're doing. Are you just trying to select
all the points which lie within a single polygon? If so, you can use the
'boundary select' tool (the one to the left of the deselct tool' in MI6),
which allows you to click in a region, and it
selects all the objects within that polygon. If it is not selecting the
correct table, then use the ctrl key to select objects from a different
layer, in the usual way.
If I have misunderstood you, then this probably won't help.......
Caroline
----- Original Message -----
From: Eric Frost - HRA <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, March 27, 2001 5:23 PM
Subject: MI-L selecting against block points
Listers:
I want to select block points from small
polygons like 1.5 mile radii or 2 minute
drive-time polygons..
I have the block point table which is fine
just large (the .map part is 139 MB)
Trying to select the block points in a polygon
takes a really long time, though.. any
suggestions ?
(I could break the block points out by state
and put a 20-mile buffer around each one
have a first step that determines which state
the polygon is in.. blah blah. but I haven't
given up on the simple way..)
Is there much of a speed difference using
the different spatial operations like Intersect,
Contains, Within ? Will having everything
specified in the same projection going to make
a big difference? (i.e. the block points are in
NAD 83 and polygons may be created
without a defined projection, just lat/lon)
Is there some third-party point-in-polygon
engine that might be faster?
TIA!
Eric Frost
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