설명

Constructs a PostGIS geometry from an Extended Well-Known Binary (EWKB) representation.

	EWKB 형식이 OGC 표준은 아니지만, SRID(공간 참조 시스템 식별자)를 포함하는 PostGIS 특화 형식입니다.

개선 사항: 2.0.0 버전부터 다면체 표면(polyhedral surface) 및 TIN을 지원합니다.

This function supports 3d and will not drop the z-index.

This method supports Circular Strings and Curves.

This function supports Polyhedral surfaces.

This function supports Triangles and Triangulated Irregular Network Surfaces (TIN).

예시

This example constructs LINESTRING(-71.160281 42.258729,-71.160837 42.259113,-71.161144 42.25932) in NAD83 longitude/latitude (SRID 4269) from its EWKB representation.

PostgreSQL escape string syntax (E'...') always interprets backslash escapes. Each backslash therefore has to be doubled so that the bytea input parser receives the octal escapes.

SELECT ST_GeomFromEWKB((
    E'\\001\\002\\000\\000\\040\\255\\020\\000\\000\\003\\000\\000\\000\\344\\112\\075' ||
    E'\\013\\102\\312\\121\\300\\156\\303\\050\\010\\036\\041\\105\\100\\047\\277\\105' ||
    E'\\047\\113\\312\\121\\300\\366\\173\\142\\235\\052\\041\\105\\100\\225\\174\\354' ||
    E'\\056\\120\\312\\121\\300\\160\\231\\323\\145\\061\\041\\105\\100'
)::bytea);

0102000020AD10000003000000E44A3D0B42CA51C06EC328081E21454027BF45274BCA51C0F67B629D2A214540957CEC2E50CA51C07099D36531214540

Figure

With standard_conforming_strings enabled (the default), ordinary string literals preserve backslashes. The same EWKB can therefore be written with a single backslash before each octal byte value.

SELECT ST_GeomFromEWKB((
    '\001\002\000\000\040\255\020\000\000\003\000\000\000\344\112\075' ||
    '\013\102\312\121\300\156\303\050\010\036\041\105\100\047\277\105' ||
    '\047\113\312\121\300\366\173\142\235\052\041\105\100\225\174\354' ||
    '\056\120\312\121\300\160\231\323\145\061\041\105\100'
)::bytea);

0102000020AD10000003000000E44A3D0B42CA51C06EC328081E21454027BF45274BCA51C0F67B629D2A214540957CEC2E50CA51C07099D36531214540

참고

ST_AsBinary, ST_AsEWKB, ST_GeomFromWKB