Name
ST_GeomFromMARC21 — Takes MARC21/XML geographic data as input and returns a PostGIS geometry object.
Synopsis
geometry ST_GeomFromMARC21 ( text marcxml );
Descripción
This function creates a PostGIS geometry from a MARC21/XML record, which can contain a POINT or a POLYGON. In case of multiple geographic data entries in the same MARC21/XML record, a MULTIPOINT or MULTIPOLYGON will be returned. If the record contains mixed geometry types, a GEOMETRYCOLLECTION will be returned. It returns NULL if the MARC21/XML record does not contain any geographic data (datafield:034).
LOC MARC21/XML versions supported:
Availability: 3.3.0, requires libxml2 2.6+
![[Note]](../images/note.png)
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The MARC21/XML Coded Cartographic Mathematical Data currently does not provide any means to describe the Spatial Reference System of the encoded coordinates, so this function will always return a geometry with |
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Ejemplos
Converting MARC21/XML geographic data containing a single POINT encoded as hddd.dddddd
SELECT
ST_AsText(
ST_GeomFromMARC21('
<record xmlns="http://www.loc.gov/MARC21/slim">
<leader
>00000nz a2200000nc 4500</leader>
<controlfield tag="001"
>040277569</controlfield>
<datafield tag="034" ind1=" " ind2=" ">
<subfield code="d"
>W004.500000</subfield>
<subfield code="e"
>W004.500000</subfield>
<subfield code="f"
>N054.250000</subfield>
<subfield code="g"
>N054.250000</subfield>
</datafield>
</record
>'));
st_astext
-------------------
POINT(-4.5 54.25)
(1 row)
Converting MARC21/XML geographic data containing a single POLYGON encoded as hdddmmss
SELECT
ST_AsText(
ST_GeomFromMARC21('
<record xmlns="http://www.loc.gov/MARC21/slim">
<leader
>01062cem a2200241 a 4500</leader>
<controlfield tag="001"
> 84696781 </controlfield>
<datafield tag="034" ind1="1" ind2=" ">
<subfield code="a"
>a</subfield>
<subfield code="b"
>50000</subfield>
<subfield code="d"
>E0130600</subfield>
<subfield code="e"
>E0133100</subfield>
<subfield code="f"
>N0523900</subfield>
<subfield code="g"
>N0522300</subfield>
</datafield>
</record
>'));
st_astext
-----------------------------------------------------------------------------------------------------------------------
POLYGON((13.1 52.65,13.516666666666667 52.65,13.516666666666667 52.38333333333333,13.1 52.38333333333333,13.1 52.65))
(1 row)
Converting MARC21/XML geographic data containing a POLYGON and a POINT:
SELECT
ST_AsText(
ST_GeomFromMARC21('
<record xmlns="http://www.loc.gov/MARC21/slim">
<datafield tag="034" ind1="1" ind2=" ">
<subfield code="a"
>a</subfield>
<subfield code="b"
>50000</subfield>
<subfield code="d"
>E0130600</subfield>
<subfield code="e"
>E0133100</subfield>
<subfield code="f"
>N0523900</subfield>
<subfield code="g"
>N0522300</subfield>
</datafield>
<datafield tag="034" ind1=" " ind2=" ">
<subfield code="d"
>W004.500000</subfield>
<subfield code="e"
>W004.500000</subfield>
<subfield code="f"
>N054.250000</subfield>
<subfield code="g"
>N054.250000</subfield>
</datafield>
</record
>'));
st_astext
-------------------------------------------------------------------------------------------------------------------------------------------------------------
GEOMETRYCOLLECTION(POLYGON((13.1 52.65,13.516666666666667 52.65,13.516666666666667 52.38333333333333,13.1 52.38333333333333,13.1 52.65)),POINT(-4.5 54.25))
(1 row)