Case-patients whose addresses were geocoded were matched to census tracts by using a spatial join in ArcGIS: those for 2000 2005 were spatially joined to census tracts by using the 2000 Census; those for 2006 2011 were joined to census tract designations from the 2010 Census.
For spatial (range, nearest neighbor, or spatial join) queries, Quadtree, R*-tree or SS-tree are the most popular indexes.
It also supports spatial data types in its implementation, providing spatial indexing and efficient algorithms for spatial join.
Spatial join procedure was used to examine the relationship between the underlying geology of the study area and fluoride distribution.
The one-to-many spatial join has been used in this study to model event frequencies for each respective weather hazard.
This Hadoop system currently has eight basic spatial operations (e.g., distance, convex hull, clip, spatial join) and six advanced ones (e.g., point density, location-allocation, hotspot detection) for distributed spatial data processing.
Also the overall efficiency of the algorithm is very low because the model used in preprocessing for determining visibility and building the spatial join index would need to be significantly changed.
County polygons were joined with county-level covariates using the "spatial join" tool in ArcGIS Desktop Version 10.2.2 for Windows (Environmental Systems Research Institute, Redlands, CA).
Each point was initially linked to the nearest street segment (i.e. a segment of a street between cross roads) using a spatial join.
Distance to highway was calculated for each residence within ArcGIS by conducting a spatial join to the edge of highway polygon, providing a Euclidian distance.
The geocoded cohort addresses, water utilities, and water supply areas with their arsenic concentrations were mapped in ArcGIS 9.1, and arsenic concentrations were assigned to the cohort members' addresses, with the spatial join functionality.
