shrug-l: question du jour input

Fri, 30 Sep 2005 17:17:12 -0400

This is a multi-part message in MIME format.

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I can sympathize with wanting to reduce traffic in your Inbox.  In =
general,
responding to the poster (not the list) and summarizing to the list is a
good idea.  I can also understand the benefit of monitoring the traffic.
Also, sometimes a problem evolves and requires additional input.

=20

One solution is to create a SHRUG mail folder, and set up a Rule to
automatically move incoming emails with =93shrug-l=94 in the subject to =
the
SHRUG folder.  This way you can monitor incoming SHRUG emails (if you =
want)
and keep your Inbox clear.

=20

In Microsoft Outlook (XP):

1. Create the SHRUG mail folder.  Right click on =93Personal Folders=94, =
select
=93New Folder=94 call it SHRUG.

2. Set up a Rule to move incoming SHRUG emails to it.  Tools =96 Rules =
and
Alerts, E-Mail Rules tab, New Rule.  Rules Wizard =96 =93Start creating =
a rule
from a template=94, Step 1 =93Move messages with specific words in the =
subject
to a folder=94, Step 2 =96 click on =93specific words=94 and type in =
=93shrug-l=94, then
click on =93specified folder=94 and navigate to your new SHRUG folder.  =
Hit next
a couple of times, name the rule, check the box to run the rule now if =
you
want, and hit Finish.

=20

=20

- Miguel Garriga

Geographic Systems LLC

  _____ =20

From: shrug-l-admin@lists.dep.state.fl.us
[mailto:shrug-l-admin@lists.dep.state.fl.us] On Behalf Of Cyndi Brown
Sent: Friday, September 30, 2005 4:01 PM
To: lance.peterson@dot.state.fl.us; shrug-L@lists.dep.state.fl.us
Subject: shrug-l: question du jour input

=20

My op is, if you dont want to read it delete it. ez! but some other =
people
may just benefit from the back and forth sharing, they may have similar
probs.=20

-----Original Message-----=20
From: lance.peterson@dot.state.fl.us=20
Sent: Sep 30, 2005 1:21 PM=20
To: shrug-L@lists.dep.state.fl.us=20
Subject: RE: shrug-l: Question du jour=20

I like the back and forth also. This is really the best GIS newsgroup I
belong too.=20

At least we don't have a problem with spam.=20

Lance Peterson

"Nonie Castro" <nonie_castro@coxtarget.com>=20
Sent by: shrug-l-admin@lists.dep.state.fl.us=20

09/30/2005 01:17 PM=20

To

<shrug-L@lists.dep.state.fl.us>=20

cc

=20

Subject

RE: shrug-l: Question du jour

=20

=20

=20

If we are taking a vote - I don't mind the back and forth in real time.=20

  _____ =20

From: shrug-l-admin@lists.dep.state.fl.us
[mailto:shrug-l-admin@lists.dep.state.fl.us] On Behalf Of Joe Noble
Sent: Friday, September 30, 2005 1:06 PM
To: Sykes, John; Geographic Systems LLC; shrug-L@lists.dep.state.fl.us
Subject: RE: shrug-l: Question du jour

I would like to suggest some sort of protocol that folks post their
question, once, then those that have a possible solution contact the =
person
directly not numerous e-mails to the entire user list.  After a solution =
has
been decided, the original person posting the question could sum the
solutions in one e-mail back to the board.  Sorry but my e-mail has been
looking like a GIS chat room as of late.  Joe=20
 =20
Joe Noble=20
GIS/IS Coordinator=20
Tall Timbers Research Station=20
850-893-4153  x-232=20
 =20

=20

  _____ =20

From: shrug-l-admin@lists.dep.state.fl.us
[mailto:shrug-l-admin@lists.dep.state.fl.us] On Behalf Of Sykes, John
Sent: Friday, September 30, 2005 12:41 PM
To: Geographic Systems LLC; shrug-L@lists.dep.state.fl.us
Subject: RE: shrug-l: Question du jour=20
 =20
That's a good website.  From it I gather that if I want BOTH the =
distances
and azimuths to my sampling locations from the site center to be the =
most
accurate, the Azimuthal Equidistant projection is the best solution.=20
 =20
I came up with part of the rest of your solution on my own, however, I'm
having trouble rotating it through 360=B0.=20
 =20
Another solution I thought of, is setting up the sector lines in an =
AutoCad
file, then importing it into my map with a world file using the center =
point
and the intersection of the first radial with the 10 mile buffer ring as =
the
two points.=20

-- John=20
 =20
 =20

=20

  _____ =20

From: Geographic Systems LLC [mailto:info@geographicsystems.com]=20
Sent: Friday, September 30, 2005 12:19 PM
To: Sykes, John
Subject: RE: shrug-l: Question du jour=20
Hi John,=20
 =20
I will try to address the first part of your question (drawing lines out =
10
miles at 11.25 degree increments) and the last part (projections). The
second part of your question (rhumb line from site point to sampling
location) may require more research.=20
 =20
Projections =96 definitely play a part in spatial accuarcy. My guess is =
you
want a projection that preserves direction and distance. A good place =
to
start is the summary tables at the bottom of the map projection poster,
<http://erg.usgs.gov/isb/pubs/MapProjections/projections.html>
http://erg.usgs.gov/isb/pubs/MapProjections/projections.html.=20
 =20
Drawing lines of specific distance and angle. You can do this manually =
when
you sketch a line. With Task set to Create New Feature and Target your =
line
feature class, click the sketch tool (pencil) and click on the first =
point
of your line. Then right click away from the sketch and select =
=93Direction=94
(or CTRL-A) specify an angle (0 being horizontal =96 ie =9311.25=94) and =
then
right click away from sketch again and select =93Length=94 (or CTRL-L) =
ie =932mi=94
(=93mi=94 for miles). Or you can enter both the first time you right =
click by
selecting =93Direction/Length=94 (or CTRL-G). Check out online help for
=93Creating segments using angles and lengths=94.=20
 =20
Miguel Garriga=20
Geographic Systems, LLC=20
 <http://www.geographicsystems.com/> www.geographicsystems.com=20
407-261-0451=20
cel 321-279-6019=20

=20

  _____ =20

From: shrug-l-admin@lists.dep.state.fl.us
[mailto:shrug-l-admin@lists.dep.state.fl.us] On Behalf Of Sykes, John
Sent: Friday, September 30, 2005 10:21 AM
To: shrug-L@lists.dep.state.fl.us
Subject: shrug-l: Question du jour=20
 =20

Since we (collectively) solved the question I had yesterday, here's a =
new
one (put on your thinking caps - this one's tougher!).=20

Problem=20

When establishing environmental sampling locations around a site, we =
like to
ensure that the various distance buffer rings are evenly covered (e.g., =
in
this case:  "site boundary" to 2 miles, 2 - 5 miles and 5 - 10 miles.  =
This
is simple to create and check with the standard multiple buffer tool in
ArcToolbox.=20

However, we also like to check that the 16 compass sectors around the =
site
have also been evenly covered*.  These 22-1/2=B0 sectors are centered on =
N,
NNE, NE, ENE, E, ESE, SE, SSE, S, SSW, SW, WSW, W, WNW, NW and NNW.=20

So, what I would like to do is to create these sectors visually, by =
drawing
a line from the origin (an arbitrary "center" point on the site) out to =
10
miles starting at 11-1/4=B0 compass heading, then rotate around =
22-1/2=B0 and
draw a line, until the 16 sectors are visually defined.=20

Any suggestions as how this can be done (easily)?  Previously, when =
doing
this in AutoCad, I used a radial copy command.  I haven't noticed a =
similar
command in ArcGIS.=20

Finally, once the sampling location is selected (and the lat/long of =
that
location determined), we need to be able to determine and list the =
distance
and azimuth (rhumb line) from that arbitrary "center" point on the site =
to
the sampling location and put it into the sampling location attributes =
table
(in the past, I've done this using the NGS "Inverse" program [fudging =
the
rhumb line from the great circle azimuths] using a batch file =
input/output)
for atmospheric dispersion modeling.  However, I don't see any easy way =
to
do this with ArcInfo (especially on a batch file basis).  Any =
suggestions?=20

Finally, food for thought -- How does the projection being used effect =
the
accuracy of all of this?  Normally we use Albers (equal area) or =
Mercator
(which gives the most accurate rhumb lines), but is there a better
projection to use to obtain accurate distances & azimuths?  I understand
from the reading I've done that these functions may be rather
projection-sensitive.=20

-- John=20

*Sometimes if there is a prevailing wind bias, we'll bias our sampling
locations to that prevailing wind direction, but in the current case =
there
is no strong prevailing wind direction - the annual wind rose shows an
almost random 360=B0pattern.=20

Cynthia Brown
_______________________________________________ SHRUG-L mailing list
SHRUG-L@lists.dep.state.fl.us
http://lists.dep.state.fl.us/mailman/listinfo/shrug-l=20

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<div class=3DSection1>

I can sympathize with wanting to =
reduce traffic
in your Inbox. =A0In general, responding to the poster (not the list) =
and
summarizing to the list is a good idea.=A0 I can also understand the =
benefit of monitoring
the traffic.=A0 Also, sometimes a problem evolves and requires =
additional input.<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>One solution is to create a SHRUG =
mail
folder, and set up a Rule to automatically move incoming emails with =
&#8220;shrug-l&#8221;
in the subject to the SHRUG folder.=A0 This way you can monitor incoming =
SHRUG emails
(if you want) and keep your Inbox clear.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>In Microsoft Outlook =
(XP):<o:p></o:p></span></font></p>

1. Create the SHRUG mail folder.=A0 =
Right
click on &#8220;Personal Folders&#8221;, select &#8220;New Folder&#8221; =
call
it SHRUG.<o:p></o:p>

2. Set up a Rule to move incoming =
SHRUG emails
to it. =A0Tools &#8211; Rules and Alerts, E-Mail Rules tab, New Rule.=A0 =
Rules
Wizard &#8211; &#8220;Start creating a rule from a template&#8221;, Step =
1 &#8220;Move
messages with specific words in the subject to a folder&#8221;, Step 2 =
&#8211;
click on &#8220;specific words&#8221; and type in &#8220;shrug-l&#8221;, =
then
click on &#8220;specified folder&#8221; and navigate to your new SHRUG =
folder.=A0
Hit next a couple of times, name the rule, check the box to run the rule =
now if
you want, and hit Finish.<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<div>

<p class=3DMsoNormal><em><i><font size=3D2 color=3Dnavy =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:navy'>- Miguel =
Garriga<o:p></o:p></span></font></i></em></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Geographic Systems =
LLC<o:p></o:p></span></font></p>

</div>

<div>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>

<hr size=3D2 width=3D"100%" align=3Dcenter tabindex=3D-1>

</span></font></div>

<p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font =
size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'> =
shrug-l-admin@lists.dep.state.fl.us
[mailto:shrug-l-admin@lists.dep.state.fl.us] <b><span =
style=3D'font-weight:bold'>On
Behalf Of </span></b>Cyndi Brown<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Friday, September =
30, 2005
4:01 PM<br>
<b><span style=3D'font-weight:bold'>To:</span></b>
lance.peterson@dot.state.fl.us; shrug-L@lists.dep.state.fl.us<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> shrug-l: =
question du jour
input</span></font><o:p></o:p></p>

</div>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<div>

<p class=3DMsoNormal style=3D'margin-bottom:12.0pt'><font size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>My op is, if =
you dont
want to read it delete it. ez! but some other people may just benefit =
from the
back and forth sharing, they may have similar probs. <br>
<br>
<br>
-----Original Message----- <br>
From: lance.peterson@dot.state.fl.us <br>
Sent: Sep 30, 2005 1:21 PM <br>
To: shrug-L@lists.dep.state.fl.us <br>
Subject: RE: shrug-l: Question du jour <br>
<br>
<br>
</span></font><font size=3D2 face=3Dsans-serif><span =
style=3D'font-size:10.0pt;
font-family:sans-serif'>I like the back and forth also. This is really =
the best
GIS newsgroup I belong too.</span></font> <br>
<br>
<font size=3D2 face=3Dsans-serif><span =
style=3D'font-size:10.0pt;font-family:sans-serif'>At
least we don't have a problem with spam.</span></font> <br>
<font size=3D2 face=3Dsans-serif><span =
style=3D'font-size:10.0pt;font-family:sans-serif'><br>
Lance Peterson<br>
</span></font><br>
<br>
<o:p></o:p></p>

<table class=3DMsoNormalTable border=3D0 cellpadding=3D0 width=3D"100%"
 style=3D'width:100.0%'>
 <tr>
  <td width=3D"40%" valign=3Dtop style=3D'width:40.0%;padding:.75pt =
.75pt .75pt .75pt'>
  <p class=3DMsoNormal><b><font size=3D1 face=3Dsans-serif><span =
style=3D'font-size:
  7.5pt;font-family:sans-serif;font-weight:bold'>&quot;Nonie =
Castro&quot;
  &lt;nonie_castro@coxtarget.com&gt;</span></font></b><font size=3D1
  face=3Dsans-serif><span =
style=3D'font-size:7.5pt;font-family:sans-serif'> </span></font><br>
  <font size=3D1 face=3Dsans-serif><span =
style=3D'font-size:7.5pt;font-family:sans-serif'>Sent
  by: shrug-l-admin@lists.dep.state.fl.us</span></font> <o:p></o:p></p>
  <p><font size=3D1 face=3Dsans-serif><span =
style=3D'font-size:7.5pt;font-family:
  sans-serif'>09/30/2005 01:17 PM</span></font> <o:p></o:p></p>
  </td>
  <td width=3D"59%" valign=3Dtop style=3D'width:59.0%;padding:.75pt =
.75pt .75pt .75pt'>
  <table class=3DMsoNormalTable border=3D0 cellpadding=3D0 =
width=3D"100%"
   style=3D'width:100.0%'>
   <tr>
    <td style=3D'padding:.75pt .75pt .75pt .75pt'>
    <p class=3DMsoNormal align=3Dright style=3D'text-align:right'><font =
size=3D1
    face=3Dsans-serif><span =
style=3D'font-size:7.5pt;font-family:sans-serif'>To</span></font><o:p></o=
:p></p>
    </td>
    <td valign=3Dtop style=3D'padding:.75pt .75pt .75pt .75pt'>
    <p class=3DMsoNormal><font size=3D1 face=3Dsans-serif><span =
style=3D'font-size:
    =
7.5pt;font-family:sans-serif'>&lt;shrug-L@lists.dep.state.fl.us&gt;</span=
></font>
    <o:p></o:p></p>
    </td>
   </tr>
   <tr>
    <td style=3D'padding:.75pt .75pt .75pt .75pt'>
    <p class=3DMsoNormal align=3Dright style=3D'text-align:right'><font =
size=3D1
    face=3Dsans-serif><span =
style=3D'font-size:7.5pt;font-family:sans-serif'>cc</span></font><o:p></o=
:p></p>
    </td>
    <td valign=3Dtop style=3D'padding:.75pt .75pt .75pt .75pt'>
    <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span
    style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p>
    </td>
   </tr>
   <tr>
    <td style=3D'padding:.75pt .75pt .75pt .75pt'>
    <p class=3DMsoNormal align=3Dright style=3D'text-align:right'><font =
size=3D1
    face=3Dsans-serif><span =
style=3D'font-size:7.5pt;font-family:sans-serif'>Subject</span></font><o:=
p></o:p></p>
    </td>
    <td valign=3Dtop style=3D'padding:.75pt .75pt .75pt .75pt'>
    <p class=3DMsoNormal><font size=3D1 face=3Dsans-serif><span =
style=3D'font-size:
    7.5pt;font-family:sans-serif'>RE: shrug-l: Question du =
jour</span></font><o:p></o:p></p>
    </td>
   </tr>
  </table>
  <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span
  style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p>
  <table class=3DMsoNormalTable border=3D0 cellpadding=3D0>
   <tr>
    <td valign=3Dtop style=3D'padding:.75pt .75pt .75pt .75pt'>
    <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span
    style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p>
    </td>
    <td valign=3Dtop style=3D'padding:.75pt .75pt .75pt .75pt'>
    <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span
    style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p>
    </td>
   </tr>
  </table>
  <p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span
  style=3D'font-size:12.0pt'><o:p></o:p></span></font></p>
  </td>
 </tr>
</table>

If we are taking a vote - I don't mind the =
back and
forth in real time. <o:p></o:p>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>

<hr size=3D2 width=3D"100%" align=3Dcenter>

</span></font></div>

From:
shrug-l-admin@lists.dep.state.fl.us
[mailto:shrug-l-admin@lists.dep.state.fl.us] On
Behalf Of Joe Noble 
Sent: Friday, September 30, 2005 1:06 PM 
To: Sykes, John; Geographic Systems LLC;
shrug-L@lists.dep.state.fl.us 
Subject: RE: shrug-l: Question du jour 
 
I would like to suggest some sort of protocol that =
folks post
their question, once, then those that have a possible solution contact =
the
person directly not numerous e-mails to the entire user list. =
&nbsp;After a
solution has been decided, the original person posting the question =
could sum
the solutions in one e-mail back to the board. &nbsp;Sorry but my e-mail =
has been
looking like a GIS chat room as of late. &nbsp;Joe 
&nbsp; 
Joe Noble =
 
GIS/IS Coordinator =
 
Tall Timbers Research =
Station
 
850-893-4153 =
&nbsp;x-232
 
&nbsp; <o:p></o:p>

<p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>

<hr size=3D2 width=3D"100%" align=3Dcenter>

</span></font></div>

From:
shrug-l-admin@lists.dep.state.fl.us
[mailto:shrug-l-admin@lists.dep.state.fl.us] On
Behalf Of Sykes, John 
Sent: Friday, September 30, 2005 12:41 PM 
To: Geographic Systems LLC; =
shrug-L@lists.dep.state.fl.us 
Subject: RE: shrug-l: Question du jour 
&nbsp; 
That's a good website. &nbsp;From it I gather that if =
I want
BOTH the distances and azimuths to my sampling locations from the site =
center
to be the most accurate, the Azimuthal Equidistant projection is the =
best
solution. 
&nbsp; 
I came up with part of the rest of your solution on my =
own,
however, I'm having trouble rotating it through 360=B0. =
 
&nbsp; 
Another solution I thought of, is setting up the =
sector lines
in an AutoCad file, then importing it into my map with a world file =
using the
center point and the intersection of the first radial with the 10 mile =
buffer
ring as the two points. <o:p></o:p>

<p><b><font size=3D5 face=3D"Monotype Corsiva"><span =
style=3D'font-size:18.0pt;
font-family:"Monotype Corsiva";font-weight:bold'>-- =
John</span></font></b> <br>
&nbsp; <br>
&nbsp; <o:p></o:p></p>

<p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>

<hr size=3D2 width=3D"100%" align=3Dcenter>

</span></font></div>

From: =
Geographic
Systems LLC [mailto:info@geographicsystems.com] 
Sent: Friday, September 30, 2005 12:19 PM 
To: Sykes, John 
Subject: RE: shrug-l: Question du jour 
Hi John, 
&nbsp; 
I will try to address the first part of your question
(drawing lines out 10 miles at 11.25 degree increments) and the last =
part
(projections). &nbsp;The second part of your question (rhumb line from =
site
point to sampling location) may require more research. =
 
&nbsp; 
Projections &#8211; definitely play a part in spatial
accuarcy. &nbsp;My guess is you want a projection that preserves =
direction and
distance. &nbsp;A good place to start is the summary tables at the =
bottom of
the map projection poster, <a
href=3D"http://erg.usgs.gov/isb/pubs/MapProjections/projections.html"><fo=
nt
size=3D2 face=3DArial>http://erg.usgs.gov/isb/pubs=
/MapProjections/projections.html</a>. 
&nbsp; 
Drawing lines of specific distance and angle. =
&nbsp;You can
do this manually when you sketch a line. &nbsp;With Task set to Create =
New
Feature and Target your line feature class, click the sketch tool =
(pencil) and
click on the first point of your line. &nbsp;Then right click away from =
the
sketch and select &#8220;Direction&#8221; (or CTRL-A) specify an angle =
(0 being
horizontal &#8211; ie &#8220;11.25&#8221;) and then right click away =
from sketch
again and select &#8220;Length&#8221; (or CTRL-L) ie &#8220;2mi&#8221;
(&#8220;mi&#8221; for miles). &nbsp;Or you can enter both the first time =
you
right click by selecting &#8220;Direction/Length&#8221; (or CTRL-G).
&nbsp;Check out online help for &#8220;Creating segments using angles =
and
lengths&#8221;. 
&nbsp; 
Miguel Garriga =
 
Geographic Systems, LLC 
<a href=3D"http://www.geographicsystems.com/">www.geographicsystems.com</s=
pan></a>
 
407-261-0451 
cel 321-279-6019 <o:p></o:p>

<p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>

<hr size=3D2 width=3D"100%" align=3Dcenter>

</span></font></div>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><br>
</span></font><b><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font =
size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'>
shrug-l-admin@lists.dep.state.fl.us
[mailto:shrug-l-admin@lists.dep.state.fl.us] <b><span =
style=3D'font-weight:bold'>On
Behalf Of </span></b>Sykes, John<b><span style=3D'font-weight:bold'><br>
Sent:</span></b> Friday, September 30, 2005 10:21 AM<b><span =
style=3D'font-weight:
bold'><br>
To:</span></b> shrug-L@lists.dep.state.fl.us<b><span =
style=3D'font-weight:bold'><br>
Subject:</span></b> shrug-l: Question du jour</span></font> <br>
&nbsp; <o:p></o:p></p>

<p><font size=3D4 face=3DArial><span =
style=3D'font-size:13.5pt;font-family:Arial'>Since
we (collectively) solved the question I had yesterday, here's a new one =
(put on
your thinking caps - this one's tougher!).</span></font> <o:p></o:p></p>

<p><font size=3D4 face=3DArial><span =
style=3D'font-size:13.5pt;font-family:Arial'>Problem</span></font>
<o:p></o:p></p>

When
establishing environmental sampling locations around a site, we like to =
ensure
that the various distance buffer rings are evenly covered (e.g., in this =
case:
&nbsp;&quot;site boundary&quot; to 2 miles, 2 - 5 miles and 5 - 10 =
miles.
&nbsp;This is simple to create and check with the standard multiple =
buffer tool
in ArcToolbox. <o:p></o:p>

However,
we also like to check that the 16 compass sectors around the site have =
also
been evenly covered*. &nbsp;These 22-1/2=B0 sectors are centered on N, =
NNE, NE,
ENE, E, ESE, SE, SSE, S, SSW, SW, WSW, W, WNW, NW and NNW. =
<o:p></o:p>

<p><font size=3D4 face=3DArial><span =
style=3D'font-size:13.5pt;font-family:Arial'>So,
what I would like to do is to create these sectors visually, by drawing =
a line
from the origin (an arbitrary &quot;center&quot; point on the site) out =
to 10
miles starting at 11-1/4=B0 compass heading, then rotate around =
22-1/2=B0 and draw
a line, until the 16 sectors are visually defined.</span></font> =
<o:p></o:p></p>

Any
suggestions as how this can be done (easily)? &nbsp;Previously, when =
doing this
in AutoCad, I used a radial copy command. &nbsp;I haven't noticed a =
similar
command in ArcGIS. <o:p></o:p>

Finally,
once the sampling location is selected (and the lat/long of that =
location
determined), we need to be able to determine and list the distance and =
azimuth
(rhumb line) from that arbitrary &quot;center&quot; point on the site to =
the
sampling location and put it into the sampling location attributes table =
(in
the past, I've done this using the NGS &quot;Inverse&quot; program =
[fudging the
rhumb line from the great circle azimuths] using a batch file =
input/output) for
atmospheric dispersion modeling. &nbsp;However, I don't see any easy way =
to do
this with ArcInfo (especially on a batch file basis). &nbsp;Any =
suggestions?
<o:p></o:p>

Finally,
food for thought -- How does the projection being used effect the =
accuracy of
all of this? &nbsp;Normally we use Albers (equal area) or Mercator =
(which gives
the most accurate rhumb lines), but is there a better projection to use =
to
obtain accurate distances &amp; azimuths? &nbsp;I understand from the =
reading
I've done that these functions may be rather =
projection-sensitive.
<o:p></o:p>

<p><b><font size=3D5 face=3D"Monotype Corsiva"><span =
style=3D'font-size:18.0pt;
font-family:"Monotype Corsiva";font-weight:bold'>-- =
John</span></font></b> <o:p></o:p></p>

<p><font size=3D4 face=3DArial><span =
style=3D'font-size:13.5pt;font-family:Arial'>*Sometimes
if there is a prevailing wind bias, we'll bias our sampling locations to =
that
prevailing wind direction, but in the current case there is no strong
prevailing wind direction - the annual wind rose shows an almost random
360=B0pattern.</span></font> <o:p></o:p></p>

</div>

</div>

</body>

<PRE>

Cynthia Brown</PRE>
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