20200407 09185400 1.0 TRUE Designated Market Areas (DMAs) This data set provides eight feature classes. The base feature class is called esri_dm and isn't generalized. The weighted centroids feature class is called esri_dm_cent. The centroids are weighted by the U.S. Block Centroids population distribution. Use the weighted centroids in report aggregation and spatial overlay operations. The esri_dm and esri_dm_cent feature classes contain all the attributes. There are six generalized boundaries feature classes and called: esri_dm_gen2, esri_dm_gen3, esri_dm_gen4, esri_dm_gen5, esri_dm_gen6 and esri_dm_gen7. Use the generalized boundaries when creating study areas. Esri; Nielsen Media Research, Inc.; U.S. Census Bureau