levelByScale(scale){
let level;
if(scale){
if(scale<=800){
level=20;
}else if(scale>800&&scale<=1500){
level=19;
}else if(scale>1500&&scale<=3000){
level=18;
}else if(scale>3000&&scale<=5300){
level=17;
}else if(scale>5300&&scale<=12000){
level=16;
}else if(scale>12000&&scale<=25000){
level=15;
}else if(scale>25000&&scale<=50000){
level=14;
}else if(scale>50000&&scale<=100000){
level=13;
}else if(scale>100000&&scale<=200000){
level=12;
}else if(scale>200000&&scale<=400000){
level=11;
}else if(scale>400000&&scale<=800000){
level=10;
}else if(scale>800000&&scale<=1550000){
level=9;
}else if(scale>1550000&&scale<=1600000){
level=8;
}else if(scale>1600000&&scale<=6000000){
level=7;
}else if(scale>6000000&&scale<=12000000){
level=6;
}else if(scale>12000000&&scale<=25000000){
level=5;
}else if(scale>25000000&&scale<=50000000){
level=4;
}else if(scale>50000000&&scale<=100000000){
level=3;
}else if(scale>100000000&&scale<=200000000){
level=2;
}
return level;
}
}