Map Rectifier -> TrekBuddy (workflow)

4.3.2009 13:30 | Přečteno: 2010× | poslední úprava: 4.3.2009 16:42

Steps to calibrate a raster map and convert it to TrekBuddy

• upload your map to http://labs.metacarta.com/rectifier/
• georeference (using google sattelite view for instance)
• warp and download the result in geotiff format
• first we'll process it through gdalwarp since otherwise convert (ImageMagick) has problems reading some (nonstandard?) TIF tags and the file is not correctly converted

  gdalwarp downloaded_file.tif map_name.tif

• now we'll create calibration file for TrekBuddy (awk script below)

  awk -f geotiff2gmi.awk map.tif >map_name.gmi

• TBCutter.pl works with maps in PNG so we need to convert it (ImageMagick's convert here)

  convert map_name.tif map_name.png

• ./TBCutter.pl -f map_name.png

• mv map_name.gmi map_name/

• move map_name to your TrekBuddy/maps directory

geotiff2gmi.awk:

BEGIN {
if ( ARGC != 2 ) {
        print "Expecting exactly one parameter: tif file"
        exit
}
file=ARGV[1]

cmd="test -f "file
test=system(cmd)

if ( test != 0 ){
        print "File cannot be read. Exiting"
        exit
}
print "Map Calibration data file v3.0"
print file
cmd="gdalinfo "file "| sed -n \"/Size is/s/^[^0-9]*\([0-9]*\),.*/\\1/p\""
cmd | getline x
cmd="gdalinfo "file "| sed -n \"/Size is/s/^[^0-9]*[0-9]*, \([0-9]*\)/\\1/p\""
cmd | getline y
print x
print y
FS="[()]"
cmd="gdalinfo "file
while ( cmd | getline ) {
gsub(" ","",$0)
if ( $1 ~ /^UpperLeft/ ) {gsub(",",";",$2);print "0;0;"$2";"}
if ( $1 ~ /^UpperRight/ ) {gsub(",",";",$2);print x";0;"$2";"}
if ( $1 ~ /^LowerLeft/ ) {gsub(",",";",$2);print "0;"y";"$2";"}
if ( $1 ~ /^LowerRight/ ) {gsub(",",";",$2);print x";"y";"$2";"}
}

       

Komentáře

[hikikomori82]

preco v awk niekore programy spustas cez system(cmd) a niektore len tak cmd | nieco ???

[jose17]

system - potrebujem zistit exit code, vystup prikazu ma nezaujima. cmd | nieco - potrebujem spracovat vystup

[hikikomori82]

v awk nie je nieco ako $?

[____]

Díky bohu není.

[____]

Konečně nějaký AWK spřízněnec :). Spousta lidí to používá jen jako jakousi náhražku za cut.