awk scripting to select a rectangle frame Post: 303044242

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Top Forums UNIX for Beginners Questions & Answers awk scripting to select a rectangle frame Post 303044242 by Neo on Monday 17th of February 2020 07:52:22 AM

02-17-2020

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I pretty sure it is possible to take latitudes and longitudes and construct a 2D geometric shape (like a rectangle) if we know the distance from the center of the coordinate system (commonly called "the elevation" above mean sea level of the earth). Otherwise, land surveying would not be possible since surveying is based on longitude and latitude (coordinates) with the elevation (on the Earth this is the distance above MSL).

Latitude and longitude, along with distance from the center of the earth, form polar coordinates, as I fondly remember from "the good ole days" when I worked as a land surveyor (actually I had my own land surveying business for many years),

The problem I have with this question is that the OP is not providing his algorithm as vbe mentioned in post #8.

So, let's ask the OP to post his formulas (algorithms) he is using to do the calculations.

The short answer is "to select a rectangle frame from longitude and latitude" is that you need to know the distance from the center of the coordinate system for each coordinate. This is simply a problem in converting polar to rectangular coordinates, and back.

Of course, you know me, I have done this kind of calculation countless times (in my youth) and never did it with awk. I used to do these calculations (almost daily) on the Tandy TRS 80 which I programmed in Basic and also the Atari / Amiga, back in the "day".

Last edited by hicksd8; 02-17-2020 at 10:38 AM..

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LEARN ABOUT SUSE

corosync-objctl

COROSYNC-OBJCTL(8)					      System Manager's Manual						COROSYNC-OBJCTL(8)

NAME

       corosync-objctl - Configure objects in the Object Database

SYNOPSIS

       corosync-objctl [-c|-w|-d|-a|-t-h] <OBJECT-SPEC>...

DESCRIPTION

       corosync-objctl is used to configure objects within the object database at runtime.

OBJECT-SPEC
       There are two types of entities
	      Objects and Key=Value pairs

       Objects
	      Objects  are  container  like entities that can hold other entities.  They are specified as "objectA"."objectB".	An example is log-
	      ging.logger.

       Key=Value pairs
	      These are the entities that actually hold values	(read  database  "fields").   They  are  specified  as	object.key=value  or  just
	      object.key if you are reading.

OPTIONS

       -c     Create a new object.

       -d     Delete an existing object.

       -w     Use this option when you want to write a new value to a key.

       -a     Display all values currently available.

       -t     Track  changes  to an object and it's children. As changes are made to the object they are printed out. this is kind of like a "tail
	      -f" for the object database.

       -h     Print basic usage.

EXAMPLES

       Print the objOne object (shouldn't exist yet).
	      $ corosync-objctl objOne

       Create the objOne object.
	      $ corosync-objctl -c objOne

       Print the objOne object (empty).
	      $ corosync-objctl objOne
	      objOne

       Write two new keys to the objOne object.
	      $ corosync-objctl -w objOne.max=3000 objOne.min=100

       Print the objOne object (with the two new keys).
	      $ corosync-objctl objOne
	      objOne.min=100
	      objOne.max=3000

       Delete the objOne.min key
	      $ corosync-objctl -d objOne.min=100

       Prove that is gone.
	      $ corosync-objctl objOne
	      objOne.max=3000

       Delete the whole objOne object.
	      $ corosync-objctl -d objOne

       Prove that is gone.
	      $ corosync-objctl objOne

SEE ALSO

       confdb_initialize(3),

AUTHOR

       Angus Salkeld

								    2008-07-29							COROSYNC-OBJCTL(8)