A scholarly resource must be written by a scholar - an expert in the field, usually with a PhD or equivalent qualifications. Scholarly resources usually tell you about the author, so that you can assess whether s/he is a reliable expert on the information presented.
Walkmeter uses GPS to measure the distance of your walks and hikes outdoors. It functions much like a stopwatch. Open the app, tap Start, and use Lap when you want to log an interval. It maps your walk, and you can view time, speed, distance, and pace as you walk.
Although there are numerous ways to calculate your stride, the simplest way is to walk ten steps, measure the distance traveled, and divide that measurement by 10. Required tools include a tape measure, chalk or other marking device, and a calculator. This process takes less than 5 minutes.