The header is similar as the head file of vector binary format but contains bounding box also. Key words are:
ORGANIZATION DIGIT DATE DIGIT NAME MAP NAME MAP DATE MAP SCALE OTHER INFO ZONE WEST EDGE EAST EDGE SOUTH EDGE NORTH EDGE MAP THRESH
The body begins with the row:
VERTI:
TYPE NUMBER_OF_COORDINATES [NUMBER_OF_CATEGORIES] X Y [Z] .... X Y [Z] [ LAYER CATEGORY] .... [ LAYER CATEGORY]
[ ]
is optional.
The primitive codes are as follows:
The order of coordinates is
X Y [Z]
Y X
Latitude/Longitude data may be given in a number of ways.
Decimal degrees must be positive or negative instead of using a hemisphere
letter. Mixed coordinates must use a hemisphere letter. Whole minutes and
seconds must always contain two digits (example: use 167:03:04.567
;
and not 167:3:4.567
).
Acceptable formats:
key: D=Degrees; M=Minutes; S=Seconds; h=Hemisphere (N,S,E,W)
(+/-)DDD.DDDDD
DDDh
DDD:MMh
DDD:MM.MMMMMh
DDD:MM:SSh
DDD:MM:SS.SSSSSh
ORGANIZATION: GRASS Development Team DIGIT DATE: 1/9/2005 DIGIT NAME: - MAP NAME: test MAP DATE: 2005 MAP SCALE: 10000 OTHER INFO: Test polygons ZONE: 0 MAP THRESH: 0.500000 VERTI: B 6 5958812.48844435 3400828.84221011 5958957.29887089 3400877.11235229 5959021.65906046 3400930.7458436 5959048.47580612 3400973.65263665 5959069.92920264 3401032.64947709 5958812.48844435 3400828.84221011 C 1 1 5958952.42189184 3400918.23126419 1 20 B 4 5959010.9323622 3401338.36037757 5959096.7459483 3401370.54047235 5959091.38259917 3401450.99070932 5959010.9323622 3401338.36037757 C 1 1 5959063.08352122 3401386.98533277 1 21
Available at: GRASS ASCII vector format specification source code (history)
Latest change: Tuesday Dec 17 20:17:20 2024 in commit: ab90c5e5a9b668894da360fa97ffd4a51a38931e
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