--- a/pkg/controllers/diff.go	Thu Nov 14 14:53:15 2019 +0100
+++ b/pkg/controllers/diff.go	Mon Nov 18 11:54:20 2019 +0100
@@ -172,7 +172,7 @@
 	}
 
 	if minuendTree == nil {
-		return 0, fmt.Errorf("Cannot find survey for %s/%s.",
+		return 0, fmt.Errorf("cannot find survey for %s/%s",
 			dci.Bottleneck,
 			dci.Minuend.Format(common.DateFormat))
 	}
@@ -190,13 +190,13 @@
 		dci.Subtrahend.Time,
 	).Scan(&box.X1, &box.Y1, &box.X2, &box.Y2); {
 	case err == sql.ErrNoRows:
-		return 0, errors.New("No such intersection")
+		return 0, errors.New("no such intersection")
 	case err != nil:
 		return 0, err
 	}
 
 	if box.Empty() {
-		return 0, errors.New("Intersection is empty")
+		return 0, errors.New("intersection is empty")
 	}
 
 	log.Printf("info: bbox of intersection: (%.2f, %.2f) - (%.2f, %.2f)\n",
@@ -221,15 +221,15 @@
 	}
 
 	if subtrahendTree == nil {
-		return 0, fmt.Errorf("Cannot find survey for %s/%s.",
+		return 0, fmt.Errorf("cannot find survey for %s/%s",
 			dci.Bottleneck,
 			dci.Subtrahend.Format(common.DateFormat))
 	}
 
 	// We need a slow path implementation for this.
 	if epsg != subtrahendTree.EPSG() {
-		return 0, errors.New("Calculating differences between two different " +
-			"EPSG code meshes are not supported, yet.")
+		return 0, errors.New("calculating differences between two different " +
+			"EPSG code meshes are not supported, yet")
 	}
 
 	start = time.Now()
@@ -246,7 +246,7 @@
 
 	zMin, zMax, ok := raster.ZExtent()
 	if !ok {
-		return 0, errors.New("Scans do not have common points")
+		return 0, errors.New("scans do not have common points")
 	}
 
 	log.Printf("info: z range: %.3f - %.3f\n", zMin, zMax)