diff --git a/src/create-contour/contour.js b/src/create-contour/contour.js
index fc6ed1f..8f28fef 100644
--- a/src/create-contour/contour.js
+++ b/src/create-contour/contour.js
@@ -26,21 +26,21 @@ const execShellCommand = (cmd) => {
  * Relies on GRASS
  *
  * @param {String} inputPath The path of the GeoTIFF to convert
- * @param {String} fileName The name of the GeoTIFF
+ * @param {String} datasetTimestamp The timestamp of the GeoTIFF
  * @param {String} interval Elevation interval between contours
  *
  * @returns {Promise<String>} A Promise that resolves to the console output of the underlying GDAL process
  *
  * @throws If provided paths are invalid or conversion fails, an error is thrown
  */
-const createContourLines = async (inputPath, interval) => {
+const createContourLines = async (inputPath, datasetTimestamp, interval) => {
     // valdate inputPath
     if (! await fs.existsSync(inputPath)) {
         throw `Input file does not exist: ${inputPath}/`;
     }
 
     // build command for sub-process
-    const contourCmd = `gdal_contour -b 2 -a TEMP -i ${interval} -f "GeoJSON" /${inputPath} /tmp/output.geojson`;
+    const contourCmd = `gdal_contour -b 2 -a TEMP -i ${interval} -f "GeoJSON" /${inputPath} /tmp/output${datasetTimestamp}.geojson`;
 
     return await execShellCommand(contourCmd);
 }
diff --git a/src/create-contour/index.js b/src/create-contour/index.js
index 66468d2..c8f8143 100644
--- a/src/create-contour/index.js
+++ b/src/create-contour/index.js
@@ -23,15 +23,6 @@ const contourLinesWorker = async (workerJob, inputs) => {
     const inputPath = inputs[0];
     const interval = inputs[2];
 
-    await createContourLines(inputPath, interval);
-
-    // array aus multiLines als geoJSON
-    // todo check if it needs a relative path
-    const contourLines = fetch("/tmp/output.geojson")
-        .then((response) => response.json())
-        .then(data => { return (data) })
-
-
     // get region and timestamp from input (example format: langenfeld_20230629T0500Z.tif)
     const regex = /^([^_]+)_(\d{8}T\d{4}Z)/;
     const matches = inputs[1].match(regex);
@@ -48,11 +39,13 @@ const contourLinesWorker = async (workerJob, inputs) => {
     // get timestamp for current hour
     //const currentTimestamp = dayjs.utc().startOf('hour');
 
-    if (datasetTimestamp) {
-        // timestamp of dataset not valid
-        logger.info('Could not parse dataset timestamp.');
-        throw 'Could not parse dataset timestamp.';
-    }
+    await createContourLines(inputPath, datasetTimestamp, interval);
+
+    // array aus multiLines als geoJSON
+    // todo check if it needs a relative path
+    const contourLines = fetch(`/tmp/output${datasetTimestamp}.geojson`)
+        .then((response) => response.json())
+        .then(data => { return (data) });
 
     // Create table
     // TODO check if this can be moved to seperate file