diff --git a/kartaview_exif_mapper/main.ts b/kartaview_exif_mapper/main.ts
index aa663330..a28b4630 100644
--- a/kartaview_exif_mapper/main.ts
+++ b/kartaview_exif_mapper/main.ts
@@ -2,6 +2,9 @@
  conversion de données gpx
  conversion de données exif
  **/
+
+// @ts-ignore
+import piexif, { IExif, IExifElement, TagValues } from 'piexif';
 import * as fs from 'node:fs';
 // @ts-ignore
 import path from "node:path";
@@ -22,7 +25,7 @@ let folders_list_txt: any = [
     // "6102537", "6102569", "6127433", "6133465", "6242729", "6329129", "6329177", "6329241", "6329305", "6329321", "6738633", "6738809", "6738953", "6752761",
     // "6752889",
     // "6752905",
-    "6752921",
+    // "6752921",
     "6752937",
     // "6752953", "6760985", "6761049", "6761289", "6794633", "7325929", "7326457", "7328265", "7330009", "7330025",
     // "7330041",
@@ -51,7 +54,7 @@ if (mini_arguments['gpx-input']) {
 }
 
 
-let dossier_photo: string = folder + "photo"
+let dossier_photo: string = folder + "test_photo_apply"
 let dossier_gpx_input: string = folder + "metadata_file"
 let path_gpx_input: string = dossier_gpx_input + "/" + sequence_name + "/" + file_gpx
 
@@ -61,7 +64,6 @@ if (mini_arguments['gpx-input-path']) {
 
 
 let gpxData: any = {}
-let tableKartaviewTrace: any = []
 
 
 function makeGpxFromKartaview(tableKartaviewTrace: any) {
@@ -113,29 +115,43 @@ function reduceGpxPointsToInterval(sequence_name: any) {
     let interval = Math.round(gpxData[sequence_name].length / photos_count_in_sequence)
     let ii = 1;
     console.log('--------- sequence_name', sequence_name)
+    console.log('--------- nombre de photos ', photos_count_in_sequence)
+    console.log('--------- nombre de points gpx ', gpxData[sequence_name].length)
     console.log('--------- interval: prendre une donnée gps tous les ', interval, 'points de la trace de séquence')
-    let jj=0
+    let jj = 0
     let photo_counter = 0
     gpxData[sequence_name].forEach((elem: any) => {
         // only work on an interval of files to assign gps coordinates
         jj++
         ii--
-        if(ii<=0){
+        if (ii <= 0) {
             // set the gps coordinates to the picture in sequence
             let timestamp = elem[6] * 1000
             let lat = elem[0]
             let lon = elem[1]
             let date = new Date(timestamp)
             let iso = date.toISOString()
-            console.log('* point de trace n°', jj)
-            console.log('* lat, lon', lat,lon)
-            console.log('* date iso', iso)
-            ii =interval*1
-            photo_counter++
+            // console.log('* point de trace n°', jj)
+            // console.log('* lat, lon', lat,lon)
+            // console.log('* date iso', iso)
+            ii = interval * 1
+
+            let exif = {};
+
+            exif[piexif.ExifIFD.DateTimeOriginal] = iso;
+
+
 
             let file_photo_name = photo_folders_counter[sequence_name][photo_counter]
-            console.log('file_photo_name to apply exif data', file_photo_name)
+            console.log('file_photo_name to apply exif data', photo_counter, file_photo_name)
+            if (file_photo_name) {
+                // set exif data
 
+                // https://piexifjs.readthedocs.io/en/latest/functions.html#insert
+                // piexif.insert(exifStr, jpegData)
+
+            }
+            photo_counter++
         }
 
     })
@@ -183,7 +199,7 @@ function openKartaviewTxtGPX(filepath: any, sequence_name: string) {
 
             writeFile('' + fileName + '_trace.gpx', content_gpx)
         }
-        if(Object.keys(gpxData).length === folders_list_txt.length){
+        if (Object.keys(gpxData).length === folders_list_txt.length) {
             gather()
         }
         // console.log('gpx_content', gpx_content)
@@ -193,8 +209,6 @@ function openKartaviewTxtGPX(filepath: any, sequence_name: string) {
 
 let cwd = path.dirname(process.cwd()) + '/' + path.basename(process.cwd())
 
-let expandedFileList: any = []
-
 /**
  * get a list of all files in a path
  * @param folderPath
@@ -204,31 +218,10 @@ async function getAllFilesInFolder(folderPath: string) {
 
     console.log('reading folder ', folderPath)
     filesList = fs.readdirSync(folderPath);
-    // console.log('readSubdirectories - files', folderPath, filesList.length)
-
-    // filesList.forEach((subDirOrFile:any) => {
-    //     const newFullPath = cwd + '/' + subDirOrFile
-    //
-    //     if (fs.existsSync(newFullPath)) {
-    //         const s = fs.statSync(newFullPath)
-    //
-    //         if (s.isFile()) {
-    //             expandedFileList.push(cwd + '/' + subDirOrFile)
-    //             console.log('add file', cwd + '/' + subDirOrFile)
-    //         }
-    //     }
-    // })
     return filesList;
 
 }
 
-function mapExifDataOnListOfFilesFromGpxData(listOfFiles: any, gpxData: any) {
-    listOfFiles.forEach((elem: any) => {
-        // find corresponding timestamp
-        // add exif info
-        // save file
-    })
-}
 
 function writeFile(fileName: string, fileContent: any) {
     console.log('write file', fileName)
@@ -248,17 +241,9 @@ let photo_folders_counter: any = {}
 
 function listPhotos(sequence_number: string) {
     let photo_folder = dossier_photo + '/' + sequence_number;
-
-    let gps_points = gpxData[sequence_number]
-    // console.log('gps_points', gps_points)
-    // pour réconcilier les données, on divise la trace en part égales du nombre de photos présentes dans la séquence.
-
     getAllFilesInFolder(photo_folder)
         .then(listOfFiles => {
-
-            // console.log('listOfFiles', listOfFiles)
             photo_folders_counter[sequence_number] = listOfFiles
-
         })
 }
 
@@ -282,15 +267,9 @@ async function getGPXAndEnrichExifOfPhotosInFolder(sequence_number: string) {
 
 }
 
-console.log('dossiers à traiter: ', folders_list_txt.length)
-folders_list_txt.forEach((elem: string) => {
-    getGPXAndEnrichExifOfPhotosInFolder(elem).then(r => {
-            console.log('r', r)
-        }
-    )
-})
-
-
+/**
+ * runs after all sequences have gotten their photo and gpx data
+ */
 function gather() {
 
 
@@ -303,3 +282,18 @@ function gather() {
     })
 
 }
+
+function main() {
+
+    console.log('dossiers à traiter: ', folders_list_txt.length)
+    folders_list_txt.forEach((elem: string) => {
+        getGPXAndEnrichExifOfPhotosInFolder(elem).then(r => {
+                console.log('r', r)
+            }
+        )
+    })
+}
+
+// run it all
+main()
+