{ "culture": "en-US", "name": "", "guid": "", "catalogPath": "", "snippet": "", "description": "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.", "summary": "", "title": "Designated Market Areas (DMAs)", "tags": [], "type": "", "typeKeywords": [], "thumbnail": "", "url": "", "minScale": "NaN", "maxScale": "NaN", "spatialReference": "", "accessInformation": "Esri; Nielsen Media Research, Inc.; U.S. Census Bureau", "licenseInfo": "", "portalUrl": "" }