diff --git a/build b/build
index 28bfd18..7acd16f 100755
--- a/build
+++ b/build
@@ -41,6 +41,7 @@ if [[ "$#" -lt 1 ]]; then
 	echo -e "    ${CACTION}client-watch${RS}     - Auto-rebuild the client-side code on modification.";
 	echo -e "    ${CACTION}dev-server${RS}       - Start the development web server for the web interface.";
 	echo -e "    ${CACTION}dev-server-stop${RS}  - Stop the development web server.";
+	echo -e "    ${CACTION}geojson-debug${RS}    - Generate some GeoJSON from the raw readings for debugging purposes (paste into geojson.io)";
 	echo -e "";
 	
 	exit 1;
@@ -200,6 +201,9 @@ task_dev-server-stop() {
 	task_end $?;
 }
 
+task_geojson() {
+	sqlite3 lorawan.sqlite 'SELECT readings.latitude, readings.longitude, rssis.rssi FROM readings LEFT JOIN rssis ON readings.id = rssis.reading_id ORDER BY readings.latitude,readings.longitude;' | perl -pe 'chomp if eof' | jq --raw-input --slurp 'split("\n") | map(split("|") | map(if . == "" then null else tonumber end)) | map({type: "Feature", geometry: { type: "Point", "coordinates": [ .[1], .[0] ] }, properties: { "rssi": .[2], "marker-color": (if .[2] == null then "#dd0707" else "#04a104" end), "marker-symbol": "circle" }}) | { type: "FeatureCollection", features: . }'
+}
 
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