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Annotation of researchv10dc/man/man5/map.5, revision 1.1

1.1     ! root        1: .TH MAP 5
        !             2: .CT 1 inst_info graphics
        !             3: .SH NAME
        !             4: map \- digitized map formats
        !             5: .SH DESCRIPTION
        !             6: Files used by
        !             7: .IR  map (7)
        !             8: are a sequence of structures of the form:
        !             9: .PP
        !            10: .EX
        !            11: struct {
        !            12:        signed char patchlatitude;
        !            13:        signed char patchlongitude;
        !            14:        short n;
        !            15:        union {
        !            16:                struct {
        !            17:                        short latitude;
        !            18:                        short longitude;
        !            19:                } point[n];
        !            20:                struct {
        !            21:                        short latitude;
        !            22:                        short longitude;
        !            23:                        struct {
        !            24:                                signed char latdiff;
        !            25:                                signed char londiff;
        !            26:                        } point[\-n];
        !            27:                } highres;
        !            28:        } segment;
        !            29: };
        !            30: .EE
        !            31: .PP
        !            32: Fields
        !            33: .L patchlatitude
        !            34: and
        !            35: .L patchlongitude
        !            36: tell to what
        !            37: 10-degree by 10-degree
        !            38: patch of the earth's surface a segment belongs.
        !            39: Their values range from \-9 to 8 and from \-18 to 17,
        !            40: respectively, and indicate the coordinates of the
        !            41: southeast corner of the patch in units of 10 degrees.
        !            42: .PP
        !            43: Each segment of
        !            44: .RB | n |
        !            45: points is connected; consecutive segments
        !            46: are not necessarily related.
        !            47: Latitude and longitude
        !            48: are measured in units of 0.0001 radian.
        !            49: If
        !            50: .B n
        !            51: is negative, then
        !            52: differences to the first and succeeding points
        !            53: are measured in units of 0.00001 radian.
        !            54: Latitude is counted positive to the north and
        !            55: longitude positive to the west.
        !            56: .PP
        !            57: The patches are ordered lexicographically by
        !            58: .L patchlatitude
        !            59: then
        !            60: .LR patchlongitude .
        !            61: A printable
        !            62: index to the first segment of each patch
        !            63: in a file named
        !            64: .I data
        !            65: is kept in an associated file named
        !            66: .IB data .x .
        !            67: Each line of an index file contains
        !            68: .L patchlatitude,
        !            69: .L patchlongitude
        !            70: and the byte position
        !            71: of the patch
        !            72: in the map file.
        !            73: Both the map file and the index file are ordered by
        !            74: patch latitude and longitude.
        !            75: .PP
        !            76: Shorts are stored in little-endian order, low byte first, 
        !            77: regardless of computer architecture.
        !            78: To assure portability,
        !            79: .I map
        !            80: accesses them bytewise.
        !            81: .SH "SEE ALSO"
        !            82: .IR map (7), 
        !            83: .IR proj (3)

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