Geography Reference
In-Depth Information
<nCube ID="N_BIRTH_LEG_SEX" dmnsQnty="2" cellQnty="4">
<labl>Births by legitimacy and sex</labl>
<universe>All Births</universe>
<text>Births by legitimacy and sex.</text>
<dmns rank="1" varRef="V_LEGIT"/>
<dmns rank="2" varRef="V_SEX"/>
<measure measUnit="Births" additivity="Y"/>
</nCube>
<locMap ID="LM">
<dataItem ID="N_BIRTH_LEG_SEX_1" ncubeRef="N_BIRTH_LEG_SEX>
<cubeCoord coordNo="1" coordVal="1"/>
<cubeCoord coordNo="2" coordVal="1"/>
<physLoc cellRef="L_M_Births"/>
</dataItem>
<dataItem ID="N_BIRTH_LEG_SEX_2" ncubeRef="N_BIRTH_LEG_SEX>
<cubeCoord coordNo="1" coordVal="2"/>
<cubeCoord coordNo="2" coordVal="1"/>
<physLoc cellRef="I_M_Births"/>
</dataItem>
<dataItem ID="N_BIRTH_LEG_SEX_3" ncubeRef="N_BIRTH_LEG_SEX>
<cubeCoord coordNo="1" coordVal="1"/>
<cubeCoord coordNo="2" coordVal="2"/>
<physLoc cellRef="L_F_Births"/>
</dataItem>
<dataItem ID="N_BIRTH_LEG_SEX_4" ncubeRef="N_BIRTH_LEG_SEX>
<cubeCoord coordNo="1" coordVal="2"/>
<cubeCoord coordNo="2" coordVal="2"/>
<physLoc cellRef="I_F_Births"/>
</dataItem>
</locMap>
Two concluding comments need to be made about the standard before discussing how we
used it. Firstly, it is possible to include reporting geographies as DDI variables; for example,
the set of counties within the USA could be defined as one member of a 'geography' variable
group, and mapped to a simpler variable containing the 51 states via a set of category groups.
Secondly, this is all a very abstract way of thinking about social statistics, and this in itself
has inhibited adoption of the DDI standard by the data archiving community, and within
the GB Historical GIS project.
13.3 Implementing the DDI within the GB Historical GIS
The original Great Britain Historical GIS was developed between 1994 and 2000 using a
relatively conventional combination of ArcGIS and Oracle software: most of the intelligence
lay in very complex AML code which assembled a large library of arcs (boundary segments),
each with a beginning and end date, into boundary polygons for a particular date. Statistical
reporting units - parishes, districts and counties - were defined via named label points,
and there was no guarantee that the units named in the first column within each of the
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