shapefiles.
shapefiles , , .
Shapefiles ArcView GIS , dBase. - , , . . dBase . . . dBase , .
, dBase- . : .shp. : .shx. dBase-: .dbf.
:
: counties.shp
: counties.shx
dBase: counties.dbf
Shapefiles integer () double precision ( ) ( ):
Integer: 32- (4 ).
Double: 64- IEEE (8 ).
shapefile. , shapefile.
, . , . . 1 .
integers double-precision integers, ( ) , - (PC Intel). integers double-precision integers, , - (Sun Motorola).
- 100 . 1 , , .
, 16- ( 50 16- , ).
shapefile . :
. 8 . 2 , , .
|
|
|
1.
16- . , , (4 + ) 16- , , 24- .
shapefile , . . , . 3-6 .
double-precision X, Y.
Point
{
Double X // X
Double Y // Y
}
_
_ :
MultiPoint
{
Double[4] Box // .
Integer NumPoints //
Point[NumPoints] Points //
}
: Xmin, Ymin, Xmax, Ymax.
. 100- , 8- . . 3 .
, . , , , 16- . ( 16- 4 ).
I- I- . 7 , , . - .
16- . , 50, 100- . , 50, 100- .
, , , , .
dBase.
dBase , . - DBF, Windows DOS. . , , :
, , .dbf.
, .
, (*.shp) .
