removing magic numbers
removing magic numbers

lindsaycarr/vizlab,ldecicco-USGS/vizlab,aappling-usgs/vizlab,ldecicco-USGS/vizlab,USGS-VIZLAB/vizlab,ldecicco-USGS/vizlab,lindsaycarr/vizlab,USGS-VIZLAB/vizlab,USGS-VIZLAB/vizlab,aappling-usgs/vizlab,aappling-usgs/vizlab,lindsaycarr/vizlab