Re: Question on Lambert conformal conic calibration
- --- In OziUsers-L@yahoogroups.com, "Pocileh" <pocileh@...> wrote:
> Sometimes it's better to have a map that is not calibratedThis is true.
> pixel-precise than no map at all.
For small-scale maps covering even a moderately large area, almost any
projection will give rather good results.
Tried an acid test: I drew a map of Finland using the Lambert Conformal
Conic projection. The map covers latitudes 59 to 71 N and longitudes 18
to 32 E. Then I started to calibrate it. I told Ozi the map is in the
Mercator projection. By using nine calibration points and a polynomial
calibration, the result was amazingly accurate. This is an interesting
result because the Mercator projection differs significantly from the
Lambert Conic projection on the high latitudes.
I wanted to thank all of you for the help on the LCC issue I was having.
I have had a number of other intervening issues but I am now back to the problem at
hand and expect to check the great references and also try the google and by hand calibration
that Matti suggested. I gather my post stirred some controversy--not always a bad thing and
I do appreciate the thoughtful responses--I will update with a post in the next week or so.
On a related matter -- I have had very good service from Stitchmaps 2.51 in case anyone is
considering a purchase--it works well and seems much better than the "adobe" option
From: John Philbrook <stingybobcat64@...>
Sent: Wednesday, September 24, 2008 4:00:11 PM
Subject: [OziUsers-L] Question on Lambert conformal conic calibration
I am scanning Michelin Maps into Ozi. Right now working on a map of
Italy which only has a grid for location --no Lat Long. I have found
data on the internet suggesting that the map I have is a "Lambert 10"
and the standard parallels are listed and the origin is listed. The
Central Meridian is NOT listed. First -- does anyone know what
the "10" refers to? There are State Planes with numerical
designations but I thought that was mainly a US thing. Secondly I
would assume the origin lies on the central meridian--in which case I
have the Longitude for the Central Meridian. I am translating a few
know coastal features that I have Lat and Long for to locate as
calibration points (since there is not georef data on the map itself).
I would appreciate any answers or suggestions.
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