200,000, not 800,000, attended "March for Our Lives" event

CBS notes:

More than 200,000 people attended the March for Our Lives demonstration in Washington D.C. on Saturday, according to Digital Design & Imaging Service Inc (DDIS). The Virginia-based firm uses a proprietary method for calculating crowd size using aerial photos 

The peak crowd size was 202,796 people, with a margin of error of 15 percent, the firm said. The crowd reached its largest size at 1 p.m., according to the company's estimates. . . .