term% cat index.txt ROAD(7) Miscellaneous Information Manual ROAD(7)
NAME
road, gps - road map of the United States
SYNOPSIS
games/road [ -g ] [ -s scale ]
games/gps
DESCRIPTION
Road displays a road map centered around some specified place in the
United States. The data comes from the Census Bureau Tiger Database.
The map is drawn in three shades of grey. Light grey is used for water
features such as rivers, streams and lakes. Dark grey is used for
railroads and airports. Black is used for roads. On terminals with
ldepth zero, all shades appear black.
Without options, the center of the map is the latitude and longitude
specified in the file /lib/sky/here. If the -g option is given, the
center of the map will be the latitude and longitude specified by con‐
tinually monitoring the end of the file /tmp/gpslog. This file is
written by the GPS satellite receiver program gps. With this option,
and with gps running, road becomes a moving map display suitable for
cars or planes.
Keyboard commands
s number
sets the scale of the map to number. The number can be prefixed
with + or - to increase/decrease the current scale. Scale 6 is
about one mile across the screen and scale 10 is about ten miles
across. Scales 1 through 10 are drawn with maximum detail show‐
ing all roads, trails, rivers, streams and airports. Scales 11
through 14 show highways, rivers, airports and county bound‐
aries. Scales 15 through 20 show interstate highways and state
boundaries.
/regexp
All features labeled by text matching the regular expression are
highlighted.
p place
centers the map at the specified place. Usually the place must
have the associated state code, (eg murrayhill,nj) but places
like lax and ewr are also known.
l latitude longitude
centers the map at the specified coordinate.
g toggles the -g option described above.
q Exit.
Mouse button commands
Button 1
displays the text of the line nearest the cursor. Normally this
is the name of a street or river.
Button 2
displays the text of the place nearest the cursor. Normally
this is a town.
Button 3
centers the display on the cursor position.
Gps reads /dev/eia0 assumed connected to a Garmin GPS-55 satellite re‐
ceiver and writes the current location on the end of the file /tmp/gp‐
slog. It is intended to be used with mobile PC's.
FILES
/lib/roads/LLLL/LLLLGGGG.h
scale 1-10 database files where LLLL is the latitude multiplied
by 5 and GGGG is the longitude multiplied by 5.
/lib/roads/LLL/LLLGGG.h
scale 11-14 database files where LLL is the latitude multiplied
by 1 and GGG is the longitude multiplied by 1.
/lib/roads/LL/LLGG.h
scale 15-20 database files where LL is the latitude multiplied
by 0.2 and GG is the longitude multiplied by 0.2.
/lib/roads/place
/lib/roads/place.local are the translations between place names
and locations. These files must be sorted.
/lib/sky/here
default starting map center.
/tmp/gpslog
moving map location.
SOURCE
/sys/src/games/road
/sys/src/games/gps
ROAD(7)