Texas Tech photography professor Jerod Foster is serious about bicycles and adventure travel. Foster is so serious, in fact, that if you stop by the website for Austin-based bike maker Chumba Bikes and click on the Yaupon Titanium model designed for long-distance off-road cycling (“bikepacking,” in the sport’s parlance), what shows up is an image of the custom frame the company fabricated for him. So when Bikepacking Roots, a national group promoting the booming sport, wanted help mapping the Texas portion of the Great Plans Gravel Route, a new, roughly 3,600-mile border-to-border route from Mexico to Canada, they turned to Foster.Texas comprises a full third of the route, about 1,200 miles. The ride has its southern terminus on the Rio Grande in Presidio, situated near…