02-17-2020
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..
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Say I have a file 'example.txt' with these lines of code in it:
hello:anddasd:cheese:gerg
whatever:sdadsa:asdfasdfa:wwew
hmmmm:something:gfhfhgf:sdasdas
Question:
1. How would I write a script which is able to take all the words before the first ':'?
2. How would I write a script which is... (6 Replies)
Discussion started by: i_am_a_robot
6 Replies
2. UNIX for Dummies Questions & Answers
Hi all,
I am trying to select some columns from a file, based on the list of values.
Would like to know how best I can achive this.
If coulmn 1 has a value of 57 then print the ist column (This works)
awk -F' ' '{if ( $1 == 57 ) {print $1}}' file.txt
Now my requirement is that I have to... (14 Replies)
Discussion started by: simha77777
14 Replies
3. Shell Programming and Scripting
Dear All ,
I have file1.txt contain values like the following:
----------
23
24
25
and I have shell script which has the following :
more file1.txt | awk '{print "select 'DUMP',CODE1||'|'||CODE2||'|'||CODE3 from CODE where CODE1='" $1 "';"}' > file2.sql
all I need is to have the... (6 Replies)
Discussion started by: habuzahra
6 Replies
4. Shell Programming and Scripting
Hey Guys!
I have written a code which combines lots of files into one big file(.csv).
However, each of the original files had headers on the first line, and now that I've combined the files the headers are interspersed throughout the new combined data frame. For example, throughout the data... (21 Replies)
Discussion started by: gd9629
21 Replies
5. Shell Programming and Scripting
If i have a log file record.txt, with 10 fields
- First field is datetime
- 7th field is status
- 8th filed is name
- The last field (10th) is epoch time of the first field
02/17/2012 1:47 PM||||||In Use|chicken||1329515230
02/17/2012 2:53 PM||||||Available|chicken||1329519195
02/17/2012... (4 Replies)
Discussion started by: sabercats
4 Replies
6. Shell Programming and Scripting
I have created the script to grep the errors from weblogic logs files and redirecting output to file.txt ...From file.txt I'm using awk command to collect the past 20 mins output...The script running from cron every 15 mins... The script working well...
Now the challenges, I'm trying to use... (27 Replies)
Discussion started by: zenkarthi
27 Replies
7. Shell Programming and Scripting
Hi Experts ,
I need your help to collect the complete data between two time frame from the log files, when I try awk it's collecting the data only which is printed with time stamp
for example, awk works well from "16:00 to 17:30" but its not collecting <line*> "from 17:30 to 18:00"
... (8 Replies)
Discussion started by: zenkarthi
8 Replies
8. Shell Programming and Scripting
Hi,
I saw your post..
I have a dought in awk command...
how to get the output from a file. i need a first column in etc/passwd file in a single column (in indivijual line)...
i couldn't get with this command
cat /etc/passwd | awk -F ":" '{printf $1}'
Kindly help
This thread was created... (3 Replies)
Discussion started by: Dheepak s
3 Replies
9. UNIX and Linux Applications
Hi, this is my first post here.
I wanto make a screencasting program. I want to make a screen part selection to grab coordinates of the screen location.
I found a nice prototype
#include <X11/Xlib.h>
//#include <X11/Xresource.h>
#include <stdlib.h>
#include <stdio.h>
#include... (0 Replies)
Discussion started by: whatnext
0 Replies
10. Shell Programming and Scripting
I am trying to have the user select two files from a numbered list which will eventually be turned into a variable then combined. This is probably something simple and stupid that I am doing.
clear
echo "Please Select the Show interface status file"
select FILE1 in *;
echo "Please Select the... (3 Replies)
Discussion started by: dis0wned
3 Replies
HT(4) Kernel Interfaces Manual HT(4)
NAME
ht - RH-11/TU-16 magtape interface
DESCRIPTION
The files mt0, mt1, ... refer to the DEC RH/TM/TU16 magtape. When opened for reading or writing, the tape is not rewound. When closed,
it is rewound (unless the 0200 bit is on, see below). If the tape was open for writing, a double end-of-file is written. If the tape is
not to be rewound the tape is backspaced to just between the two tapemarks.
A standard tape consists of a series of 512 byte records terminated by a double end-of-file. To the extent possible, the system makes it
possible, if inefficient, to treat the tape like any other file. Seeks have their usual meaning and it is possible to read or write a byte
at a time. Writing in very small units is inadvisable, however, because it tends to create monstrous record gaps.
The last octal digit of the minor device number selects the drive. The middle digit selects a controller. The initial digit is even to
select 800 BPI, odd to select 1600 BPI. If the 0200 bit is on (initial digit 2 or 3), the tape is not rewound on close. Note that the
minor device number has no necessary connection with the file name, and in fact tp(1) turns the short name x into `/dev/mtx'.
The mt files discussed above are useful when it is desired to access the tape in a way compatible with ordinary files. When foreign tapes
are to be dealt with, and especially when long records are to be read or written, the `raw' interface is appropriate. The associated files
may be named rmt0, ..., rmt7, but the same minor-device considerations as for the regular files still apply.
Each read or write call reads or writes the next record on the tape. In the write case the record has the same length as the buffer given.
During a read, the record size is passed back as the number of bytes read, provided it is no greater than the buffer size; if the record is
long, an error is indicated. In raw tape I/O, the buffer must begin on a word boundary and the count must be even. Seeks are ignored. A
zero count is returned when a tape mark is read; another read will fetch the first record of the next tape file.
FILES
/dev/mt?, /dev/rmt?
SEE ALSO
tp(1)
BUGS
The magtape system is supposed to be able to take 64 drives. Such addressing has never been tried.
Taking a drive off line, or running off the end of tape, while writing have been known to hang the system.
If any non-data error is encountered, it refuses to do anything more until closed. In raw I/O, there should be a way to perform forward
and backward record and file spacing and to write an EOF mark explicitly.
HT(4)