Działający w wersji jednowątkowej.

logback.xml

@@ -1,4 +1,5 @@
 <configuration>
+    <timestamp key="bySecond" datePattern="yyyyMMdd'T'HHmmss"/>
     <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
         <encoder>
             <!--            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>-->
@@ -6,7 +7,8 @@
         </encoder>
     </appender>
     <appender name="FILE" class="ch.qos.logback.core.FileAppender">
-        <file>terrain.log</file>
+        <file>logfile-${bySecond}.txt</file>
+<!--        <file>terrain.log</file>-->
         <append>true</append>
         <encoder>
             <!--            <pattern>%-4relative [%thread] %-5level %logger{35} - %msg%n</pattern>-->

src/main/java/pl/wat/ms4ds/terrain/nmt/NMTDataReader.java

@@ -6,6 +6,9 @@ import pl.wat.ms4ds.terrain.*;
 
 import java.io.*;
 import java.util.*;
+import java.util.concurrent.Executor;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 
@@ -20,13 +23,24 @@ public class NMTDataReader {
         // Dzieli na podstringi biorąc jako znak podziału spację i jej wielokrotność
         String[] splitted2 = "b a e l.d u  n  g".split("[ ]+");
 
-        String fn_list = "D:/work/nmt/m-33_files.txt";
+//        String fn_list = "D:/work/nmt/m-33_files.txt";
-        String inDir = "D:/work/nmt/m-33/";
+        String inDir = "D:/work/nmt/";
         String workDir = "D:/work/temp/";
         String outDir = "D:/work/kwadraty_nmt/withElevation/25m/";
 
+        ArrayList<String> list = new ArrayList<>();
+        list.add("m-33");
+        list.add("m-34");
+        list.add("m-35");
+        list.add("n-33");
+        list.add("n-34");
+        ExecutorService executor = Executors.newVirtualThreadPerTaskExecutor();
+
         Thread t = new Thread(() -> {
-            generateNMTData(fn_list, 0, 24000, inDir, workDir, outDir);
+            for (int i = 0; i < list.size(); i++) {
+                String fn_list = inDir + list.get(i) + "_files.txt";
+                generateNMTData(executor, fn_list, 0, 24000, inDir + list.get(i) + "/", workDir, outDir);
+            }
         });
 //        HashMap<Coord.Grid, NMTData> nmtDataHashMap = new HashMap<>();
 //        try {
@@ -139,7 +153,7 @@ public class NMTDataReader {
      * @param workDir
      * @param outDir
      */
-    static void generateNMTData(String fn_list, int startPos, int endPos, String inDir, String workDir, String outDir) {
+    static void generateNMTData(ExecutorService executor, String fn_list, int startPos, int endPos, String inDir, String workDir, String outDir) {
         File file = new File(fn_list);
         ArrayList<String> fileNames = new ArrayList<>();
         try (BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file)))) {
@@ -176,20 +190,22 @@ public class NMTDataReader {
             for (String ufn : unzippedFileNames) {
                 String fpath = workDir + ufn;
                 try {
-                    readFromFile(fpath, nmtDataHashMap);
                     f = new File(fpath);
-                    f.delete();
-                } catch (Exception e) {
                     if (f.length() < 10) {
                         logger.warn("File: {} is empty.", ufn);
+                        continue;
+                    }
+                    readFromFile(fpath, nmtDataHashMap);
+                } catch (Exception e) {
+                    logger.warn("Error while reading from file: {}.", ufn);
+                    try (BufferedWriter writer = new BufferedWriter(new FileWriter("D:/Work/nmt/status.txt", true))) {
+                        writer.write("Error while reading file: " + ufn + " at position: " + i + "\n");
+                    } catch (IOException e1) {
+                        logger.debug(e1.getMessage());
+                    }
+                } finally {
+                    if (f != null) {
                         f.delete();
-                    } else {
-                        logger.warn("Error while reading from file: {}.", ufn);
-                        try (BufferedWriter writer = new BufferedWriter(new FileWriter("D:/Work/nmt/status.txt", true))) {
-                            writer.write("Error while reading file: " + ufn + " at position: " + i + "\n");
-                        } catch (IOException e1) {
-                            logger.debug(e1.getMessage());
-                        }
                     }
                 }
             }

teren.properties

@@ -4,13 +4,13 @@ x_ref=14
 y_ref=49
 dx_ref=11
 dy_ref=7
-#kwadraty_dir=D:/work/kwadraty_nmt/withElevation/
+#kwadraty_dir=D:/work/terrain/
-#kwadraty_dir=D:/Workspace/_data/new/
+kwadraty_dir=D:/work/kwadraty_nmt/withElevation/
-kwadraty_dir=C:/Workspace/_data/swdt/ms4ds/teren/kwadraty/
+#kwadraty_dir=C:/Workspace/_data/swdt/ms4ds/teren/kwadraty/
 drogi_dir=au2data/new_teren/Polska/drogi/
 #
 #Rozdzielczosc terenu dl_mk=200 | 100 | 50 | 25 | 20
-dl_mk=100
+dl_mk=25
 #
 #W celu wymuszenia (mimo jej braku) przejezdności terenu nalezy ustawić na: on
 przejezdnosc_zawsze=off