I have double-checked the calculation of NADCON shifts in Georgia. The
first calculation contained an error; the range in shifts is from 9.3 to
31.0 meters. The patterns and angles I reported earlier still appear
correct. You can compute the shifts interactively at
Dear MapInfo-L readers,
I am taking the liberty of forwarding this message, posted today on a
geographically limited list server, to this list because it requests a
MapInfo solution. Please respond directly to the original sender and feel
free to post answers here if you think they may be of
and n = 2*63 - 101 = 25.
--Bill Huber
Quantitative Decisions
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disciplines, a decided strength of GIS; however,
lack of common terminology, and--far worse--the pandemic tendency to use
terms in a loose and ill-defined way, expose GIS as a young area without
(as yet) a solid professional or scientific grounding.
Cheers,
Bill Huber
Quantitative Decisions
-distance calculations recently
in his GeoWorld columns; see www.geoplace.com (the site appears to be down
as I write this, whence the lack of a precise URL) or look through back
copies of GeoWorld.
Cheers,
Bill Huber
Quantitative Decisions
At 02:43 PM 6/12/02 -0500, Clifford J Mugnier wrote:
Computing Grid Convergence angle (grivation) at a point with the brute
force method (suggested below) is valid only for short lines. For lines
over 5 miles in length, one must use the (T-t) correction. Alternatively,
compute the direct
At 12:34 PM 4/29/02 -0400, Miller, Keith wrote:
Why would you want to protect data itself? If you do not want shared do
not release it. GIS data should be accessible to all in need.
Interesting question. Protection can mean many different things. You
have implicitly assumed it means
At 09:32 AM 4/24/02 +1000, Robert Crossley wrote:
A while ago, I asked a question about an external function to calculate
the area of a polygon and got some good references. I ended up using the
gauss-green function based on the formula:
Area=(Sum(y(n)-y(n+1))*(x(n)+x(n+1)))/2 .
...
So am I
At 12:22 PM 3/20/02 -0500, jelena puzic wrote:
Does anyone know how to translate ArcView 3.x shp files into MapInfo so
that the original ArcView coloured polygons retain their colour on
translation? Is it possible to somehow export the ArcView colour palette used?
Shape files do not contain
Dear Steve,
At 11:21 AM 3/15/02 +1100, you wrote:
The aim is to group 5000 points into 500 groups so that the sum of the
straight
line distances between the points in each group is the minimum or optimised.
I think I am looking for a clustering algorithm.
Yes. Specifically, if you define the
At 07:28 AM 3/12/02 -0500, Jacques Paris wrote:
In comparing 2 regions, one must consider two kinds of data related to shape
and to position. snip--rest of message below
This problem is encountered in other GISes, too (e.g.,
ArcView). Everything Paris says is correct, useful, and insightful
At 01:24 PM 2/28/02 +, Brendan.O'[EMAIL PROTECTED] wrote:
I then tried the general solution and for angles (ccw from x) of 45 and or
135 degrees found it also worked, however at say 90 degrees (ccw from x,
i.e. a strike of 360 degrees) I found no elongation (i.e. ellipses were
circles) upon
At 08:53 PM 11/2/01 +0100, Uffe Kousgaard wrote:
Shape files doesn't have a style at all, so what you are referring to is
whatever Arcview picks by random, when it opens a table. Of course MapInfo
can't translate that.
(Original message at bottom.)
This used to be true but was changed by ESRI
At 11:07 AM 9/13/01 +0100, Brooks, Stephen wrote:
I
would like to know the name of a line that links all points of equal
distance from a specific point. This is not necessarily just a circle
around the point if you take into consideration permeability of route
networks.
Isometric curve would be
. If all coordinates are
multiplied by z, to be consistent the answer had better be multiplied by
|z|; however, the determinant above (or any similar looking expression)
will be multiplied by z^2.
--Bill Huber
Quantitative Decisions
At 04:34 PM 4/3/01 +0200, Mats Elfstrm wrote:
BTW, which version of AV does this? Is it in one of the Analyst addons?
A full "dynamic segmentation" capability has been built into base ArcView
since version 3.1 through objects and requests in its Avenue programming
language. The original
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