Thank you everyone for your responses. This should help a lot.
Another question: Is there any way to move a plot a tiny amount with a hot
key, like Alt+right arrow. Maybe 10 pixels or 5 or 1? I have a difficult
time adjusting my plots exactly. When I click on one to drag it, it tends to
jump, sometimes half-way across the screen. The little dots that show river
or road crossings disappear and putting it to rights is difficult.
FYI: I bought a book a couple weeks ago -- _Surveyors and Statesmen: Land
Measuring in Colonial Virginia_ by Sarah S. Hughes. I'm finding it very
informative. It's available for $28 from the Virginia Association of
Surveyors.
Judy S. Hite, executive secretary
Virginia Association of Surveyors
8752 Landmark Road
Richmond, VA 23228
I've also found through Google Books two 18th century instruction books on
surveying that I'm trying to work through -- _Geodaesia_ by John Love and
_Geodaesia Improved_ by Arthur Burns. Both are available full text through
Google Books.
----- ----- ----- -----
Jim Gill
e-mail: jimvgill(a)windstream.net
website:
www.jimgill.net
-----Original Message-----
From: deed-mapper-users-bounces(a)rootsweb.com
[mailto:deed-mapper-users-bounces@rootsweb.com]On Behalf Of Steve
Broyles
Sent: Monday, December 07, 2009 11:08 AM
To: deed-mapper-users(a)rootsweb.com
Subject: Re: [DMU] magnetic vs true north
Yes, the maps are oriented to true north and the surveyors used magnetic
compasses
that had some amount of error. In some places and times their surveys were
compensated
to remove the error, but in my experience they were seldom corrected. The
error is
called "declination".
You can rotate a parcel by including a "Decl" line at any point prior to the
first Pt, e.g.
Decl 3
This will rotate the parcel 3 degrees clockwise. Decl -2.5 will rotate 2.5
degrees counterclockwise.
Steve Broyles
----- Original Message -----
From: "James Gill" <jimvgill(a)windstream.net>
To: "Deed Mapper" <DEED-MAPPER-USERS(a)rootsweb.com>
Sent: Monday, December 07, 2009 9:22 AM
Subject: [DMU] magnetic vs true north
I've noticed that many of my plots along waterways do not line
up.
Obviously, they won't perfectly, but, it would seem if they were rotated
just slightly they would line up better. Is this a function of the
variance.
Most of my surveys mention about 3 degrees sometimes as high as 3
degrees
50
minutes. Are the maps set to true north and the surveys magnetic
north? Is
there a way to rotate a plot the amount of the variance specified?
----- ----- ----- -----
Jim Gill
e-mail: jimvgill(a)windstream.net
website:
www.jimgill.net
-------------------------------
To unsubscribe from the list, please send an email to
DEED-MAPPER-USERS-request(a)rootsweb.com with the word 'unsubscribe' without
the quotes in the subject and the body of the message
-------------------------------
To unsubscribe from the list, please send an email to
DEED-MAPPER-USERS-request(a)rootsweb.com with the word 'unsubscribe' without
the quotes in the subject and the body of the message
