Handle condition that interval is null

Add handling condition for condition that VortexGrid::interval is null in DssDataWriter.

If interval is null or zero set data type to INST-VAL.

Add unit test for TIF to DSS conversion.

vortex-api/src/main/java/mil/army/usace/hec/vortex/io/DssDataWriter.java

@@ -84,10 +84,12 @@ public void write() {
                 options.put("partF", grid.description());
             }
 
-            if (!cPart.equals("PRECIPITATION")
-                    && options.getOrDefault("dataType", "").isEmpty()
-                    && !grid.interval().equals(Duration.ZERO)) {
-                options.put("dataType", "PER-AVER");
+            if (!cPart.equals("PRECIPITATION") && options.get("dataType") == null) {
+                if (!Duration.ZERO.equals(grid.interval()))
+                    options.put("dataType", "PER-AVER");
+
+                if (grid.interval() == null || Duration.ZERO.equals(grid.interval()))
+                    options.put("dataType", "INST-VAL");
             }
 
             if (cPart.equals("PRECIPITATION") && !grid.interval().isZero()

vortex-api/src/test/java/mil/army/usace/hec/vortex/io/BatchImporterTest.java

@@ -381,4 +381,62 @@ void irregularSpatialGrid() {
             Logger.getAnonymousLogger().log(Level.SEVERE, e, e::getMessage);
         }
     }
+
+    @Test
+    void tifToDss() {
+        URL inUrl = Objects.requireNonNull(getClass().getResource("/tif_to_dss/hms_cn_grid.tif"));
+
+        String inFile = new File(inUrl.getFile()).toString();
+
+        List<String> inFiles = new ArrayList<>();
+        inFiles.add(inFile);
+
+        Path pathToDestination = Paths.get(System.getProperty("java.io.tmpdir"), "hms_cn_grid.dss");
+
+        try {
+            HecDataManager.close(pathToDestination.toString(), false);
+            Files.deleteIfExists(pathToDestination);
+        } catch (IOException e) {
+            Logger.getAnonymousLogger().log(Level.SEVERE, e, e::getMessage);
+        }
+
+        List<String> variables = new ArrayList<>();
+        variables.add("hms_cn_grid");
+
+        BatchImporter importer = BatchImporter.builder()
+                .inFiles(inFiles)
+                .variables(variables)
+                .destination(pathToDestination.toString())
+                .build();
+
+        importer.process();
+
+        int[] status = new int[1];
+        GriddedData griddedData = new GriddedData();
+        griddedData.setDSSFileName(pathToDestination.toString());
+        griddedData.setPathname("///////");
+        GridData gridData = new GridData();
+        griddedData.retrieveGriddedData(true, gridData, status);
+        if (status[0] < 0) {
+            Assertions.fail();
+        }
+
+        GridInfo gridInfo = gridData.getGridInfo();
+        Assertions.assertEquals("", gridInfo.getStartTime());
+        Assertions.assertEquals("", gridInfo.getEndTime());
+        Assertions.assertEquals("UNSPECIF", gridInfo.getDataUnits());
+        Assertions.assertEquals(DssDataType.INST_VAL.value(), gridInfo.getDataType());
+        Assertions.assertEquals(98, gridInfo.getMaxValue());
+        Assertions.assertEquals(21, gridInfo.getMinValue());
+        Assertions.assertEquals(70.09265, gridInfo.getMeanValue(), 1E-5);
+
+        griddedData.done();
+
+        try {
+            HecDataManager.close(pathToDestination.toString(), false);
+            Files.deleteIfExists(pathToDestination);
+        } catch (IOException e) {
+            Logger.getAnonymousLogger().log(Level.SEVERE, e, e::getMessage);
+        }
+    }
 }