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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plmeridians

PLMERIDIANS(3plplot)						    PLplot API						      PLMERIDIANS(3plplot)

NAME

       plmeridians - Plot latitude and longitude lines.

SYNOPSIS

       plmeridians(mapform, dlong, dlat, minlong, maxlong, minlat, maxlat)

DESCRIPTION

       Displays latitude and longitude on the current plot.  The lines are plotted in the current color and line style.

       Redacted form:  General: plmeridians(mapform, dlong, dlat, minlong, maxlong, minlat, maxlat) F95, Java, Perl/PDL, Python: Not implemented?

       This function is used in example 19.

ARGUMENTS

       mapform (void (*) (PLINT, PLFLT *, PLFLT *), input)
	      A  user  supplied function to transform the coordinate  longitudes and latitudes to a plot coordinate system.   By using this trans-
	      form, we can change from a longitude,  latitude coordinate to a polar stereographic project, for	example.   Initially,  x[0]..[n-1]
	      are  the longitudes and y[0]..y[n-1]  are the corresponding latitudes.  After the call to mapform(), x[]	and y[] should be replaced
	      by the corresponding plot coordinates.   If no transform is desired, mapform can be replaced by NULL.

       dlong (PLFLT, input)
	      The interval in degrees at which the longitude lines are to be plotted.

       dlat (PLFLT, input)
	      The interval in degrees at which the latitude lines are to be plotted.

       minlong (PLFLT, input)
	      The value of the longitude on the left side of the plot.	The value of minlong must be less than	the  value  of	maxlong,  and  the
	      quantity maxlong-minlong must be less than or equal to 360.

       maxlong (PLFLT, input)
	      The value of the longitude on the right side of the plot.

       minlat (PLFLT, input)
	      The  minimum  latitude  to be plotted on the background.	 One can always use -90.0 as the boundary outside the plot window  will be
	      automatically eliminated.  However, the program will be  faster if one can reduce the size of the background plotted.

       maxlat (PLFLT, input)
	      The maximum latitudes to be plotted on the background.   One can always use 90.0 as the boundary outside the plot  window   will	be
	      automatically eliminated.

AUTHORS

       Geoffrey  Furnish  and  Maurice LeBrun wrote and maintain PLplot.  This man page was automatically generated from the DocBook source of the
       PLplot documentation, maintained by Alan W. Irwin and Rafael Laboissiere.

SEE ALSO

       PLplot documentation at http://plplot.sourceforge.net/resources.

								   August, 2012 					      PLMERIDIANS(3plplot)