英语翻译1.5.5.1IntheGeometryMetadataforaLayerThedimensionalinformationforalayerincludesatolerancevalue.Specifically,theDIMINFOcolumn(describedinSection2.4.3)ofthexxxSDOGEOMMETADATAviewsincludesanSDOTOLERANCEvalue.If

Question

英语翻译
1.5.5.1 In the Geometry Metadata for a Layer
The dimensional information for a layer includes a tolerance value.Specifically,the
DIMINFOcolumn(described in Section 2.4.3) of the xxx_SDO_GEOM_METADATA
views includes an SDO_TOLERANCE value.
If a function accepts an optional tolerance parameter and this parameter is null or
not specified,the SDO_TOLERANCE value of the layer is used.Using the
non-geodetic data from the example in Section 2.1,the actual distance between
geometries cola_b and cola_d is 0.846049894.If a query uses the SDO_GEOM.SDO_
DISTANCE function to return the distance between cola_b and cola_d and does not
specify a tolerance parameter value,the result depends on the SDO_TOLERANCE
value of the layer.For example:
n If the SDO_TOLERANCE value of the layer is 0.005,this query returns
.846049894.
n If the SDO_TOLERANCE value of the layer is 0.5,this query returns 0.
The zero result occurs because Spatial first constructs an imaginary buffer of the
tolerance value (0.5) around each geometry to be considered,and the buffers
around cola_b and cola_d overlap in this case.
非自发自译~共9个问题1800分。没有人会翻或者用工具翻我会关闭问题。

Answer 1

1.5.5.1层的几何元数据
一个层的空间信息包括公差值.特别是,xxx_SDO_GEOM_METADATA 的DIMINFOcolumn（在章节2.4.3中有描述）包含一个SDO_TOLERANCE 值.
如果一个函数中有一个可选的公差参数,而且该参数的值为空或为说明,层就使用SDO_TOLERANCE 的值.使用实例（在章节2.1中）的非地理数据,地点cola_b和cola_d之间的实际距离是0.846049894.如果使用SDO_GEOM.SDO_DISTANCE函数,而且不给公差参数赋值,层就使用SDO_TOLERANCE 的值.例如：
如果SDO_TOLERANCE 的值是0.005,查询结果就是.846049894.
如果SDO_TOLERANCE 的值是0.5,查询结果就是0.
结果之所以是0,是因为Spatial首先为每一个几何体的公差值（0.5）创建一个虚拟缓存,而cola_b和cola_d的缓存相互重叠.