HOUSTON - From NASA helping enhance surveillance video to deputies re-walking the scene of Sunday morning’s shooting, investigators are trying to piece together information in the murder of 7-year-old Jazmine Barnes.

The Harris County Sheriff’s Office asked NASA to enhance the surveillance video of the truck investigators believe was involved in Jazmine’s murder. The FBI, ATF Texas Rangers and now NASA are just some of the many agencies involved in the case.

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From NASA helping enhance surveillance video to deputies re-walking the scene of Sunday morning's shooting, investigators are trying to piece together information in the murder of 7-year-old Jazmine Barnes.
Correa, Melissa

Related: Why so little surveillance video of suspect who killed Jazmine Barnes?

Detectives were back out at the scene near Wallisville Road and the Beltway where Jazmine was shot and killed when someone opened fire on her mother’s car Sunday morning.

Officials this week released surveillance video of the truck and a sketch of the suspect based on details Jazmine’s oldest sister gave to investigators, saying she got a good look at the killer moments before he opened fire on the family’s car.

WATCH: Justice for Jazmine: Many leads from sketch

Deputies are taking the sketch and continuing to go door-to-door in nearby neighborhoods. They have been asking residents who live and work in the area to check their cameras for possible images of the red truck.

Jazmine's murder has led to a tidal wave a tips sent to investigators.

“CrimeStoppers, as you can imagine, is inundated with people believing they might know the suspect,” said Andy Kahan, Director of Victims’ Services for CrimeStoppers. “They might have seen something.”

Kahan said investigators see each tip and ask series of questions proven to get results. All rule out or narrow information given to authorities.

Seeing those techniques crack, among others, the hard-to-solve murders of teenagers Jennifer Ertman and Elizabeth Pena in 1993, Kahan considers few tips too weak to help an investigation.

“You never know,” he said. “As innocuous or mundane as a tip might be, that might be the one, the proverbial gold nugget that leads to (arrest).”

Finding that nugget requires time. No matter how much, Kahan believes all those “I think I saw him” posts online and messages to investigators make an arrest in Barnes’ unsolved murder a certainty.

Block walks will continue Saturday with Jazmine’s family leading the charge. A community rally is set for noon Saturday in the Walmart parking lot on Wallisville Road. Volunteers will receive copies of the sketch and directions on where to share the image.