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Command: map | Section: 5 | Source: UNIX v10 | File: map.5
MAP(5) File Formats Manual MAP(5)
NAME
map - digitized map formats
DESCRIPTION
Files used by map(7) are a sequence of structures of the form:
struct {
signed char patchlatitude;
signed char patchlongitude;
short n;
union {
struct {
short latitude;
short longitude;
} point[n];
struct {
short latitude;
short longitude;
struct {
signed char latdiff;
signed char londiff;
} point[-n];
} highres;
} segment;
};
Fields and tell to what 10-degree by 10-degree patch of the earth's
surface a segment belongs. Their values range from -9 to 8 and from
-18 to 17, respectively, and indicate the coordinates of the southeast
corner of the patch in units of 10 degrees.
Each segment of |n| points is connected; consecutive segments are not
necessarily related. Latitude and longitude are measured in units of
0.0001 radian. If n is negative, then differences to the first and
succeeding points are measured in units of 0.00001 radian. Latitude is
counted positive to the north and longitude positive to the west.
The patches are ordered lexicographically by then A printable index to
the first segment of each patch in a file named data is kept in an as-
sociated file named data.x. Each line of an index file contains and
the byte position of the patch in the map file. Both the map file and
the index file are ordered by patch latitude and longitude.
Shorts are stored in little-endian order, low byte first, regardless of
computer architecture. To assure portability, map accesses them byte-
wise.
SEE ALSO
map(7), proj(3)
MAP(5)