Why does the GEDI orbit footprint look the way it does?

Why does the GEDI orbit footprint look the way it does? GEDI produces high resolution laser ranging observations of the Earth's forests and topography. GEDI was deployed to the International Space Station in 2018, and captures data along the ISS orbit shown here. When viewed in two dimensions, the ISS orbit resembles a net of offset waves This animation shows a full GEDI orbit footprint from early 2019. The ISS orbit defines GEDI coverage between 51.6 degrees, north and south. The LP DAAC is one of the NASA Earth Observing System Data and Information System (EOSDIS) DAACs and operates as a partnership with the United States Geological Survey (USGS). It is located at the USGS Earth Resources Observation and Science (EROS) Center in Sioux Falls, South Dakota.