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| Subject: | Re: [gislist] Generating Section Corner Layer Fields and Labels |
| Date: |
01/30/2007 11:00:01 AM |
| From: |
Scott Madsen |
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Thank you to both Lawrence and dt for your suggestions. I tried Lawrence's
suggestion (pasted below) as he replied first and his suggestion got the job
done for the most part:
First, I created a polygon buffer around each section corner point. I then
used the intersect tool to intersect the buffer layer polygons with my PLSS
sections layer polygons. This divided each buffer polygon into 4 equal
quarters-circles. Each quarter-circle polygon contained the section number,
township and range attributes retained from the section layer during the
intersect process.
All I had to do to get the resulting symbol shown in the attached jpeg was
symbolize the new layer by the section number field and add section number
labels.
The only problem I'm seeing is I'm unable to size the new section corner
polygons dynamically according to map scale. I have to zoom way in before I
can see them at all and, if I make the original buffer larger before running
the intersect command, the resulting polygons will be fine when zoomed out
but too large when zoomed in. It seems that I still need to generate a point
layer that contains all four quadrant fields and somehow create a map symbol
that can include multiple attribute field labels. While getting the four
attribute fields into one point layer seems to be the relatively simple task
at hand, I still don't know how to incorporate all four numeric labels into
one map symbol.
Does anyone have ideas for an ESRI-compatible map symbol that will allow me
to do this? I know how to place a single numeric label within a road symbol
but, how do you place multiple numeric labels within one map symbol? I'm
suppose I can create four separate point symbols that together resemble a
4-part section corner symbol but is there an easier way to do this?
Scott Madsen
Scott,
You might try creating a buffer around each point creating polygons. Then
you could do the intersect and get the attribute you are looking for.
Just a thought.
Lawrence Hartpence
I can suggest a cheat way around this problem, however it's not very
elegant. Make sure that you have a field with a unique identifier for every
point and make a copy of your point file. Start editing your copy in
ArcMap. Select all and move them a little bit so that they are completely
within the NW section. Save the edits and then you can use HawthsTools to
attribute the NW section attribute. Then start editing again and move all
the points to the SW section... This method will make you use HawthsTools 4
times, but it should get the job done. After you have all 4 section fields
attributed, join the moved around version to the spatially accurate version.
Calc the numbers for all four fields. Like I said, it's not very elegant.
Good luck.
dt
-----Original Message-----
From: Scott Madsen [mailto:browngis@brown.sd.us]
Sent: Monday, January 29, 2007 5:20 PM
To: gislist@lists.geocomm.com
Subject: [gislist] Generating Section Corner Layer Fields and Labels
I've posted this question to the ESRI forum list with no response yet and it
doesn't seem like a technical support question so I'm hoping someone from
this list has a suggestion for me.
I'm using ArcInfo9.2 and would like to calculate the section number
attributes for an existing section corner point layer. Once the four new
attribute fields (NE, NW, SE and SW sections) are created and attributed for
each section corner point, I'd like to label a symbol with the new attribute
fields so that the appropriate section number shows up within its respective
corner of the symbol (similar to how a CAD Section Corner symbol would look.
I'm not a programmer so, if this requires programming, I'm in trouble. I
tried HawthsTools 'Intersect Point Tool' and tried to intersect the PLSS
section polygon layer with the section corner point layer but it crashed.
Apparently, it isn't able to recognize that each section corner point
intersects four distinct section polygons.
This seems like a fairly straight-forward task so I'm hoping there's a tool
or command for generating the new fields so I don't have to calculate the
data manually.
The second part to this is finding an ESRI section corner symbol that will
allow me to enter each section number label within the appropriate quadrant
of the symbol. Instead of labeling the section polygons in my maps, I'd
rather label the section corner symbols.
I appreciate any and all help.
Scott Madsen
GIS Coordinator
Brown County, SD
605-626-4023
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