diff --git a/src/main/java/org/janelia/saalfeldlab/n5/universe/metadata/ome/ngff/v05/TransformUtils.java b/src/main/java/org/janelia/saalfeldlab/n5/universe/metadata/ome/ngff/v05/TransformUtils.java
index 39d0824..4b88c3c 100644
--- a/src/main/java/org/janelia/saalfeldlab/n5/universe/metadata/ome/ngff/v05/TransformUtils.java
+++ b/src/main/java/org/janelia/saalfeldlab/n5/universe/metadata/ome/ngff/v05/TransformUtils.java
@@ -31,8 +31,11 @@
 public class TransformUtils
 {
 
-	public static double[][] affineToMatrix( final AffineGet affine )
-	{
+	public static double[][] affineToMatrix( final AffineGet affine ) {
+
+		if (affine == null)
+			return null;
+
 		// AffineGets always have numSourceDimensions == numTargetDimensions
 		final int N = affine.numSourceDimensions();
 		final double[][] mtx = new double[N][N+1];
diff --git a/src/main/java/org/janelia/saalfeldlab/n5/universe/metadata/ome/ngff/v05/transformations/AffineCoordinateTransform.java b/src/main/java/org/janelia/saalfeldlab/n5/universe/metadata/ome/ngff/v05/transformations/AffineCoordinateTransform.java
index 57e38cb..1c57725 100644
--- a/src/main/java/org/janelia/saalfeldlab/n5/universe/metadata/ome/ngff/v05/transformations/AffineCoordinateTransform.java
+++ b/src/main/java/org/janelia/saalfeldlab/n5/universe/metadata/ome/ngff/v05/transformations/AffineCoordinateTransform.java
@@ -14,14 +14,13 @@ public AffineCoordinateTransform( BaseLinearCoordinateTransform<AffineGet> ct )
 	}
 
 	public AffineCoordinateTransform( final double[] affine) {
-		super("affine");
-		this.affineFlat = affine;
-		buildTransform(affine );
+		super("affine", affine);
+		buildTransform(affine);
 	}
 
 	public AffineCoordinateTransform( final String name, final String inputSpace, final String outputSpace,
 			final double[] affine) {
-		super("affine", name, inputSpace, outputSpace );
+		super("affine", name, inputSpace, outputSpace, affine );
 		this.affineFlat = affine;
 		buildTransform( affine );
 	}
@@ -36,13 +35,12 @@ public AffineCoordinateTransform(final String name, final N5Reader n5, final Str
 	public AffineCoordinateTransform( final String name, 
 			final String[] inputAxes, final String[] outputAxes,
 			final double[] affine ) {
-		super("affine", name, inputAxes, outputAxes  );
-		this.affineFlat = affine;
+		super("affine", name, inputAxes, outputAxes, affine );
 	}
 
 	public AffineCoordinateTransform( final String name, final String path,
 			final String inputSpace, final String outputSpace) {
-		super(name, path, inputSpace, outputSpace  );
+		super("affine", name, path, inputSpace, outputSpace  );
 	}
 
 	public JsonElement getJsonParameter() {
diff --git a/src/main/java/org/janelia/saalfeldlab/n5/universe/metadata/ome/ngff/v05/transformations/BaseLinearCoordinateTransform.java b/src/main/java/org/janelia/saalfeldlab/n5/universe/metadata/ome/ngff/v05/transformations/BaseLinearCoordinateTransform.java
index dc53d94..1d4be8d 100644
--- a/src/main/java/org/janelia/saalfeldlab/n5/universe/metadata/ome/ngff/v05/transformations/BaseLinearCoordinateTransform.java
+++ b/src/main/java/org/janelia/saalfeldlab/n5/universe/metadata/ome/ngff/v05/transformations/BaseLinearCoordinateTransform.java
@@ -3,6 +3,7 @@
 import org.janelia.saalfeldlab.n5.N5Reader;
 import org.janelia.saalfeldlab.n5.universe.metadata.ome.ngff.v05.TransformUtils;
 
+import com.google.gson.Gson;
 import com.google.gson.JsonArray;
 import com.google.gson.JsonElement;
 
@@ -24,6 +25,13 @@ public BaseLinearCoordinateTransform(final String type) {
 		super(type);
 	}
 
+	public BaseLinearCoordinateTransform(final String type, final double[] affineFlat) {
+
+		super(type);
+		this.affineFlat = affineFlat;
+		buildJsonParameter();
+	}
+
 	public BaseLinearCoordinateTransform( final BaseLinearCoordinateTransform<T> other ) {
 		super(other.type, other.path);
 		this.affine = other.affine;
@@ -32,20 +40,38 @@ public BaseLinearCoordinateTransform( final BaseLinearCoordinateTransform<T> oth
 		this.name = other.name;
 		this.input = other.input;
 		this.output = other.output;
+		buildJsonParameter();
 	}
 
-	public BaseLinearCoordinateTransform( final String type, final String name, final String inputSpace, final String outputSpace) {
-		super(type, name, null, inputSpace, outputSpace );
+	public BaseLinearCoordinateTransform(final String type, final String name, final String inputSpace, final String outputSpace) {
+
+		super(type, name, null, inputSpace, outputSpace);
+	}
+
+	public BaseLinearCoordinateTransform(final String type, final String name, final String inputSpace, final String outputSpace, final double[] affineFlat) {
+
+		super(type, name, null, inputSpace, outputSpace);
+		this.affineFlat = affineFlat;
+		buildJsonParameter();
 	}
 
 	public BaseLinearCoordinateTransform(final String type, final String name, final N5Reader n5, final String path,
 			final String inputSpace, final String outputSpace) {
-		super(type, name, path, inputSpace, outputSpace );
+
+		super(type, name, path, inputSpace, outputSpace);
 	}
 
-	public BaseLinearCoordinateTransform( final String type, final String name, 
+	public BaseLinearCoordinateTransform(final String type, final String name,
 			final String[] inputAxes, final String[] outputAxes) {
+
+		super(type, name, null, inputAxes, outputAxes);
+	}
+
+	public BaseLinearCoordinateTransform( final String type, final String name,
+			final String[] inputAxes, final String[] outputAxes, final double[] affineFlat) {
 		super(type, name, null, inputAxes, outputAxes  );
+		this.affineFlat = affineFlat;
+		buildJsonParameter();
 	}
 
 	public BaseLinearCoordinateTransform( final String type, final String name, final String path,
@@ -58,6 +84,12 @@ public JsonElement getJsonParameter() {
 		return affine;
 	}
 
+	protected void buildJsonParameter() {
+
+		if( affineFlat != null )
+			affine = new Gson().toJsonTree(affineFlat);
+	}
+
 	public void interpretParameters() {
 
 		if (!affine.isJsonArray())
@@ -114,6 +146,9 @@ public T buildTransform(double[] parameters) {
 	@Override
 	public double[] getParameters(N5Reader n5) {
 
+		if (n5 == null)
+			return null;
+
 		final double[] paramsFlat = getDoubleArray(n5, getParameterPath());
 		if (paramsFlat != null)
 			return paramsFlat;