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

Administrator

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 NETBSD

scc

SCC(4)							   BSD Kernel Interfaces Manual 						    SCC(4)

NAME

     scc -- Zilog 8530 Serial Communications Controller interface

SYNOPSIS

     scc* at ioasic? offset ?

DESCRIPTION

     The scc driver provides support for the Zilog 8530 Serial Communications Controller (SCC) via the IOASIC found on DECstation 5000 models in
     the /100, /20, and /240 series (supported by NetBSD/pmax).

     Each SCC device has two serial ports.  The DECstation 5000 model 20 provides one SCC device.  Other models provide two, but one port of each
     device is dedicated to mouse and keyboard input, respectively.

     Input and output for each line may set to one of following baud rates: 50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2400, 4800, 9600,
     19200, 38400, or 57600.

     Speeds up to 230400 are supported by the chip and the motherboard, but speeds higher than 57600 do not work reliably without an external
     clock signal.

FILES

     /dev/ttya
     /dev/ttyb
     /dev/ttyc
     /dev/ttyd

     The mapping from units to serial-hardware outlets is idiosyncratic.  The even ports are wired serial connectors and the odd-numbered ports
     are reserved for mouse and keyboard.

     On machines with one port like Personal DECstations, the single device is ttya.

     On the 5000/1xx and 5000/2xx, the first serial port (default serial console) is ttyc and the second port is ttya.

SEE ALSO

     intro(4), ioasic(4), ttys(5), MAKEDEV(8)

HISTORY

     The scc driver first appeared in 4.4BSD.

     The scc driver was also used for the IOASIC SCC found in DEC Alpha model 3000 TurboCHANNEL based systems; NetBSD/alpha has since been con-
     verted to use the machine-independent zstty(4).

BUGS

     The IOASIC provides internal DMA channels that can be programmed to transfer up to 4096 bytes of data into, or out, of an SCC without further
     software intervention.  This feature of the IOASIC is not yet supported.

     The mapping from device-special files (major and minor number) to chip and port is arguably backwards.  ULTRIX tries to hide the hardware
     mapping, but NetBSD does not.  Users wanting to use ULTRIX compatible tty names /dev/tty0 and /dev/tty1 for the scc comm-port lines should
     make links or device-special files which match their hardware setup.

BSD
								  April 24, 2003							       BSD