MarylandBG: MarylandBG border group datasets to support creating micromaps for the 24 counties in the state of Maryland

Description

The micromapST function has the ability to generate linked micromaps for any geographical area. To specify the geographical area, the bordGrp call argument is used to specify the border group dataset for the geographical area. The MarylandBG border group dataset supports creating linked micromaps for the 24 counties in the state of Maryland. When the bordGrp call argument is set to MarylandBG, the appropriate name table (county names and abbreviations) and the 24 sub-areas (countries) boundary data is loaded in micromapST. The user's data is then linked to the boundary data via the county's name, abbreviated or ID based on the table below.

Arguments

Details

The MarylandBG border group dataset contains the following data.frames:

The Maryland county border group contains 24 county sub-areas. Each county has a row in the areaNamesAbbrsIDs data.frame and a set of polygons in the areaVisBorders data.frame datasets. No regions are defined in the Utah county border group, so the L2VisBorders and RegVisBorders data.frames is not used and the dataRegionsOnly call parameter are is disabled. The L3VisBorders dataset contains the outline of the state of Maryland.

The details on each of these data.frame structures can be found in the "bordGrp" section of this document. The areaNamesAbbrsIDs data.frame provides the linkages to the boundary data for each sub-area (county) using the fullname, abbreviation, and numerical identifier for each country to the data based on the setting of the rowNames call argument.

A column or the data.frame row.names must match one of the types of names in the areaNamesAbbrsIDs data.frame name table. If the data row does not match a value in the name table, an warning is issued and the data is ignored. If no data is present for a sub-area (county) in the name table, the sub-area is mapped but not colored. The following are a list of the names, abbreviations, and ids for each country in the MarylandBG border group.

name	ab
id	Allegany
AL	24001
Anne Arundel	AA
24003	Baltimore
BL	24005
Baltimore City	BC
24510	Calvert
CV	24009
Caroline	CL
24011	Carroll
CR	24013
Cecil	CC
24015	Charles
CH	24017
Dorchester	DR
24019	Frederick
FR	24021
Garrett	GR
24023	Harford
HR	24025
Howard	HW
24027	Kent
KN	24029
Montgomery	MG
24031	Prince George's
PG	24033
Queen Anne's	QA
24035	St. Mary's
SM	24039
Somerset	SS
24037	Talbot
TB	24041
Washington	WH
24043	Wicomico
WC	24045
Worcester	WR
24047	name

There are no alternate abbreviations or regions assocated with counties in Maryland border group.

The id field value is the U. S. state and county FIPS code.

The rowNames = "alias" or "alt_ab" and the regionB and dataRegionsOnly call parameters are not supported in the MarylandBG border group.