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#!/usr/bin/perl
# XASTIR .geo file generator for mapblast pixel maps 16.10.2001
# Copyright (C) 2001 Rolf Bleher http://www.dk7in.de
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
# see file COPYING for details
#--------------------------------------------------------------------------
use POSIX; # provides acos() function
# some default values:
$width = 1280; # seems to be the maximum supported by mapblast
$height = 1024; # seems to be the maximum supported by mapblast
$pfx = "../../pixelmaps/"; # prefix for path
$pfx = "";
# undefined values:
$scale = 0;
$lat = 9999;
$lon = 9999;
$help = 0;
#--------------------------------------------------------------------------
while (@ARGV) {
$arg = shift @ARGV;
if ($arg =~ /^\-N(\d{1,2}(\.\d+)?)$/) { $lat = $1 }
if ($arg =~ /^\-S(\d{1,2}(\.\d+)?)$/) { $lat = -$1 }
if ($arg =~ /^\-E(\d{1,3}(\.\d+)?)$/) { $lon = $1 }
if ($arg =~ /^\-W(\d{1,3}(\.\d+)?)$/) { $lon = -$1 }
if ($arg =~ /^\-w(\d+)$/) { $width = $1 }
if ($arg =~ /^\-h(\d+)$/) { $height= $1 }
if ($arg =~ /^\-s(\d+)$/) { $scale = $1 }
if ($arg =~ /^\-s(\d+)k$/) { $scale = $1 * 1000 }
if ($arg =~ /^\-s(\d+)M$/) { $scale = $1 * 1000000 }
if ($arg =~ /^\-p(.+)$/) { $pfx = $1 }
if ($arg eq '-?') { $help = 1 }
if ($arg eq '-h') { $help = 1 }
if ($arg eq '--help') { $help = 1 }
}
if (!$help && $arg && $arg !~ /^\-/) {
$file = $arg; # last arg is file name
} else {
print("ERROR: Map file name is missing\n");
$help = 1;
}
if (!$help) {
if ($lat == 9999) { # we don't yet have a latitude
if ($file =~ /N(\d{1,2}(\.\d+)?)/) { $lat = $1 }
if ($file =~ /S(\d{1,2}(\.\d+)?)/) { $lat = -$1 }
}
if ($lon == 9999) { # we don't yet have a longitude
if ($file =~ /E(\d{1,3}(\.\d+)?)/) { $lon = $1 }
if ($file =~ /W(\d{1,3}(\.\d+)?)/) { $lon = -$1 }
}
if ($scale == 0) { # we don't yet have a map scale
if ($file =~ /\-(\d+)/) { $scale = $1 }
if ($file =~ /\-(\d+)k/) { $scale = $1 * 1000 }
if ($file =~ /\-(\d+)M/) { $scale = $1 * 1000000 }
}
if ($lat == 9999) { # we need a latitude
print("ERROR: Latitude is missing\n");
$help = 1;
}
if ($lon == 9999) { # we need a longitude
print("ERROR: Longitude is missing\n");
$help = 1;
}
if ($scale == 0) { # we need a map scale
print("ERROR: Map scale is missing\n");
$help = 1;
}
}
if ($help) {
usage();
exit 0;
}
if ($pfx && $pfx !~ /\/$/) { $pfx .= "/" } # add trailing '/' if missing
#--------------------------------------------------------------------------
if ($scale >= 1000000) {
printf("ERROR: Maps with scaling of 1M and above are not yet supported!\n");
printf(" They use a different projection...\n");
exit 1;
}
if (abs($lat) > 89) {
printf("ERROR: Map center too near to the poles!\n");
exit 1;
}
# This scaling factor is just a wild guess!
# But I need one, and this one is nice AND works quite well... ;-)
$scale_y = 100.0 * pi(); # pixel/degree at 1M map scale
$scale_x = $scale_y * calcScale($lat); # adjust horizontal scale for latitude
$scale_y *= (1000000 / $scale); # adjust for current map scale
$scale_x *= (1000000 / $scale);
#--------------------------------------------------------------------------
# DK7IN: I'm not sure, if this formula is exact for what Xastir
# is decoding, but in my region it works quite well
# I need to do some further investigation for the best accuracy
$latmin = $lat - ($height / 2.0 - 2.5) / $scale_y;
$latmax = $lat + ($height / 2.0 - 0.5) / $scale_y;
$lonmin = $lon - ($width / 2.0 - 0.5) / $scale_x;
$lonmax = $lon + ($width / 2.0 - 2.5) / $scale_x;
printf("FileName %s%s\n",$pfx,$file);
printf("\n");
printf("ImageSize %4d %4d\n",$width,$height);
printf("TiePoint %4d %4d %10.6f %11.6f\n",0,0,$lonmin,$latmax);
printf("TiePoint %4d %4d %10.6f %11.6f\n",$width-1,$height-1,$lonmax,$latmin);
printf("Datum WGS84\n");
printf("Projection LatLon\n");
printf("\n");
printf("# map from mapblast center %10.6f %11.6f, scale %d\n",$lat,$lon,$scale);
printf("# created with mapblast2geo.pl (DK7IN)\n");
exit 0;
#--------------------------------------------------------------------------
sub usage {
my $name = $0;
if ($name =~ /^.*\/(.+)$/) { $name = $1 }
print("\n");
print("$name (c) 2001 Rolf Bleher <Rolf\@dk7in.de>\n");
print("create Xastir .geo files for mapblast pixel maps\n");
print("usage: $name [options] mapfile\n");
print(" -N52.5 -S10 define latitude\n");
print(" -E13.3 -W0.5 define longitude\n");
print(" -h1024 define map height in pixels (default 1024)\n");
print(" -w1280 define map width in pixels (default 1280)\n");
print(" -s50000 define map scale, 50k or 1M is ok\n");
print(" -p../pixmaps define prefix for path\n");
print(" -h -? --help print this help file\n");
print(" it tries to extract center Lat/Lon and map scale\n");
print(" from the filename like N52.5E13.3-50k.xpm\n");
print("\n");
}
#--------------------------------------------------------------------------
sub pi {
return(3.14159265358979323846);
}
#--------------------------------------------------------------------------
sub deg2rad {
my ($deg) = @_;
return($deg * pi()/180.0);
}
#--------------------------------------------------------------------------
# Calculate distance in meters between two locations
sub dist {
my ($lat1, $lon1, $lat2, $lon2) = @_;
my $r_lat1 = deg2rad($lat1);
my $r_lon1 = deg2rad($lon1);
my $r_lat2 = deg2rad($lat2);
my $r_lon2 = deg2rad($lon2);
my $r_d = acos(sin($r_lat1) * sin($r_lat2) + cos($r_lat1) * cos($r_lat2) * cos($r_lon1-$r_lon2));
return($r_d*180.0*60.0/pi()*1852.0);
}
#--------------------------------------------------------------------------
sub calcScale { # EW / NS scaling
my ($lat) = @_;
return(dist($lat,-1.0/120.0,$lat,1.0/120.0) / 1852.0);
}
#--------------------------------------------------------------------------
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