Los Angeles (AFP) - Notebook in hand, Ana Alvarez walked along the streets of Skid Row, the downtown Los Angeles district that's sometimes called the homeless capital of America.Scores of tents and makeshift shelters had been erected for the night, all along the sidewalks."We don't get close to them. We try not to disturb them, because a lot of them are already asleep," Alvarez said.She was helping with the homeless count that takes place every two years across the entire county. After dark, volunteers like her scour the vast region and tally up the number of people sleeping rough."It's important to know how many people live here, to assess the resources we need," said Latoya Hawthorne, a census participant who works in a homeless women's refuge.At the last count in 2013, Los Angeles had some 39,500 homeless people.