Create Oval Graticule Layer

geoc vector graticule oval -g -180,-90,180,90 -l 20 -o ovals.shp

geoc map draw -f vector_graticule_oval.png -b "-180,-90,180,90" \
     -l "layertype=layer file=naturalearth.gpkg layername=ocean style=ocean.sld" \
     -l "layertype=layer file=naturalearth.gpkg layername=countries style=countries.sld" \
     -l "layertype=layer file=ovals.shp style='stroke=#ab9b7d stroke-width=0.5 fill=#f5deb3 fill-opacity=0.15'"