parameterise the projection settings

usr/bin/satalite-wp-update

@@ -6,6 +6,13 @@ EUMETSAT_KEY="jdBM1PsDQUm0tCZfk9VXD6IaJoUa"
 EUMETSAT_SECRET="SumkiqFMU3MAGpt_azb1KXKgjdMa"
 OUTDIR="$HOME/photos/eumetsat"
 
+PRJ=42003
+BBOX=(-7000000 -7000000 7000000 7000000)
+DEG_N=0
+DEG_E=0
+WIDTH=1020
+HEIGHT=1020
+
 error() {
 	printf "\033[31m%s\033[0m\n" "$1"
 	exit 1
@@ -27,9 +34,9 @@ url+="&service=WMS"
 url+="&request=GetMap"
 url+="&version=1.3.0"
 url+="&layers=mtg_fd:rgb_geocolour"
-url+="&width=1080&height=1080"
-url+="&bbox=-6400000,-6400000,6400000,6400000"
-url+="&crs=AUTO:42003,9001,0,0"
+url+="&width=$WIDTH&height=$HEIGHT"
+url+="&bbox=${BBOX[0]},${BBOX[1]},${BBOX[2]},${BBOX[3]}"
+url+="&crs=AUTO:$PRJ,$DEG_E,$DEG_N,0"
 url+="&styles="
 url+="&transparent=true"
 url+="&format=image/png"