temporarily hard-wired half-step in scene sequence traversing.

src/main/java/com/elphel/imagej/common/ShowDoubleFloatArrays.java

@@ -220,7 +220,7 @@ import ij.process.ImageProcessor;
 			  dpixels,                   // double[][] pixels,
 			  width,                     // int width,
 			  height,                    // int height,
-			  num_slices,          // int slices,
+			  num_slices,                // int slices,
 			  title,                     // String title,
 			  combo_titles,              // String [] titles);
 			  show);                     // boolean show

src/main/java/com/elphel/imagej/tileprocessor/GroundPlane.java

@@ -1104,7 +1104,7 @@ public class GroundPlane {
 			return null;
 		}
 	    double [][] ground_xyzatr = ErsCorrection.invertXYZATR(to_ground_xyzatr); // straight down from the camera, then rotated
-		double altitude = ground_xyzatr[0][2] - offset; // offset to the ground level (negative)
+		double altitude = ground_xyzatr[0][2] + offset; // offset to the ground level (negative)
 		double true_disparity = ref_Clt.getGeometryCorrection().getDisparityFromZ(-altitude);
 		double corrected_disparity = true_disparity+ref_Clt.getDispInfinityRef();
 		int tilesX = ref_Clt.getTilesX();

src/main/java/com/elphel/imagej/tileprocessor/QuadCLTCPU.java

@@ -2261,7 +2261,7 @@ public class QuadCLTCPU {
 		rslt_suffix += (clt_parameters.correlate_lma?"-LMA":"-NOLMA");
     	final int tilesX =   tp.getTilesX();	
     	final int tilesY =   tp.getTilesY();	
-		saveDoubleArrayInModelDirectory( // error
+		saveDoubleArrayInModelDirectory( // prints "saveDoubleArrayInModelDirectory(): saved ..."
 				rslt_suffix,           // String      suffix,
 				OpticalFlow.COMBO_DSN_TITLES, // combo_dsn_titles_full, // null,          // String []   labels, // or null
 				combo_dsn_final,       // dbg_data,         // double [][] data,
@@ -4803,7 +4803,9 @@ public class QuadCLTCPU {
     				combo_dsi,          // double [][] dsi, // if null - just check file exists
     				silent);            // boolean silent);
     		if (num_slices >= 0) {
-    			System.out.println ("restoreComboDSI(): used "+getX3dDirectory()+ Prefs.getFileSeparator() + image_name + extra_suffix + DSI_SUFFIXES[indx] + ".tiff");
+    			if (!silent) {
+    				System.out.println ("restoreComboDSI(): used "+getX3dDirectory()+ Prefs.getFileSeparator() + image_name + extra_suffix + DSI_SUFFIXES[indx] + ".tiff");
+    			}
     			setDSIFromCombo(combo_dsi); // reformat
     			return combo_dsi;
     		}
@@ -5218,10 +5220,12 @@ public class QuadCLTCPU {
     		}
     		return -1;
     	}
-    	if (dsi == null) {
-    		System.out.println("restoreDSI(): has "+imp.getStackSize()+" slices in file: "+file_path);
-    	} else {
-    		System.out.println("restoreDSI(): got "+imp.getStackSize()+" slices from file: "+file_path);
+    	if (!silent) {
+    		if (dsi == null) {
+    			System.out.println("restoreDSI(): has "+imp.getStackSize()+" slices in file: "+file_path);
+    		} else {
+    			System.out.println("restoreDSI(): got "+imp.getStackSize()+" slices from file: "+file_path);
+    		}
     	}
     	if (imp.getStackSize() < 2) {
     		if (!silent) {
@@ -6534,7 +6538,7 @@ public class QuadCLTCPU {
 		ImagePlus imp = new ImagePlus( file_name, imageStack);
 		FileSaver fs=new FileSaver(imp);
 		fs.saveAsTiff(file_path);
-		System.out.println("saveDoubleArrayInModelDirectory(): saved "+file_path);
+		System.out.println("saveDoubleArrayInTopModelDirectory(): saved "+file_path);
 		return imp;
 	}
 	
@@ -6582,7 +6586,7 @@ public class QuadCLTCPU {
 
 		FileSaver fs=new FileSaver(imp);
 		fs.saveAsTiff(file_path); // image processor null?
-		System.out.println("saveDoubleArrayInModelDirectory(): saved "+file_path);
+		System.out.println("saveImagePlusInModelDirectory(): saved "+file_path);
 		return file_path;
 	}