Stellar cartographer

From Memory Alpha, the free Star Trek reference.

A stellar cartographer is type of a astronomer who specializes in stellar cartography; that is, one who maps and creates star charts.

In 2152, the crew of the Enterprise rescued three Takret Militia deserters, named Renth, Rellus Tagrim and Guri, from an incoming class 5 neutronic storm. When it was revealed that they were from the distant Takret system, they explained that their work as stellar cartographers often took them far from home. Upon learning this, Jonathan Archer hoped that they could help them update their star charts. (ENT: "The Catwalk")

In early 2368, two new exobiologists and three stellar cartographers transfered from the USS Zhukov to the USS Enterprise-D. (TNG: "The Game")

In 2370, Deep Space 9 was assigned a new cartographer named Ensign Melora Pazlar. (DS9: "Melora")

The same year, Martus Mazur met a con artist, named Alsia, who claimed that her father was a stellar cartographer who conducted a mineral analysis of the Vlugta asteroid belt in 2340, but was never able to follow up what he found there. In an attempt to con her mark, she wished to procure the proper funding so to file her stake on the claim. (DS9: "Rivals")