change projection settings to be better parameterised

usr/bin/satalite-wp-update

@@ -7,16 +7,12 @@ EUMETSAT_SECRET="SumkiqFMU3MAGpt_azb1KXKgjdMa"
 OUTDIR="$HOME/photos/eumetsat"
 
 # full screen coverage
-# PRJ=42004
+# PRJ=AUTO:42004,52,5,0
 # BBOX=(-6400000 -100000 6400000 7700000)
-# DEG_N=5
-# DEG_E=52
 
 # full disk
-PRJ=42003
+PRJ=AUTO:42003,0,0,0
 BBOX=(-12800000 -7200000 12800000 7200000)
-DEG_N=0
-DEG_E=0
 
 WIDTH=1920
 HEIGHT=1080
@@ -44,7 +40,7 @@ url+="&version=1.3.0"
 url+="&layers=mtg_fd:rgb_geocolour"
 url+="&width=$WIDTH&height=$HEIGHT"
 url+="&bbox=${BBOX[0]},${BBOX[1]},${BBOX[2]},${BBOX[3]}"
-url+="&crs=AUTO:$PRJ,$DEG_E,$DEG_N,0"
+url+="&crs=$PRJ"
 url+="&styles="
 url+="&transparent=true"
 url+="&format=image/png"