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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | RE: GISList: Insert Block |
| Date: |
03/08/2002 10:28:20 AM |
| From: |
Bell, Kevin |
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The end that I am trying to achieve is for a traffic volume project. At
every intersection there are counts for N, S, E, W both entering and exiting
the intersection. There are also a left and right turn counts for each of
the NSEW legs. I want to display the traffic volume as points (arrows) but
also as lines. The initial data will be stored as points and then I'll
spatial join the point data of interest to my line segments as needed. This
requires careful placement of the points relative to the lines, or the
spatial join will get all screwed up. I set my points and turn lines around
one intersection very carefully in order to simulate the effect that I want
for all my intersections. Now I want to transfer the shape from this one
intersection to the rest of them, so that I have all my geometry in place
before I populate the database. In AutoCAD I'd create a block and snap it
to the center point of the intersection and then explode it, but that would
take a while for all of Salt Lake City. Instead I'll do this (unless anyone
else has a better idea):
Get my intersection points (where one street centerline crosses another)
Copy intersection points to a new .shp
Add XY
Calculate X and Y to correspond with my desired offset (X + 10, Y + 10 gives
me a new point offset that may be a northbound volume count leaving
the intersection)
Iterate until all points are offset
Merge shps into one
Populate my database.
Kevin Bell
Salt Lake City Transportation
GIS/CAD Technician
(801) 535-7131
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