diff --git a/src/geo/projection/Projection.Baidu.ts b/src/geo/projection/Projection.Baidu.ts
index 3ef0fa43d7..1d7fa42951 100644
--- a/src/geo/projection/Projection.Baidu.ts
+++ b/src/geo/projection/Projection.Baidu.ts
@@ -69,12 +69,14 @@ const ProjectionMethods = {
           cD[8] * cB * cB * cB * cB * cB * cB;
         T *= (cC.x < 0 ? -1 : 1);
         cE *= (cC.y < 0 ? -1 : 1);
+        const z = cC.z;
         if (out) {
             out.x = T;
             out.y = cE;
+            out.z = z;
             return out;
         }
-        return new Coordinate(T, cE);
+        return new Coordinate(T, cE, z);
     },
     toRadians: function (T: number): number {
         return Math.PI * T / 180;
diff --git a/src/geo/projection/Projection.EPSG3857.ts b/src/geo/projection/Projection.EPSG3857.ts
index 59c199f92e..d7b8edbaf7 100644
--- a/src/geo/projection/Projection.EPSG3857.ts
+++ b/src/geo/projection/Projection.EPSG3857.ts
@@ -30,12 +30,14 @@ const EPSG3857Projection = {
         }
         const x = lng * metersPerDegree;
         const y = c * metersPerDegree;
+        const z = lnglat.z;
         if (out) {
             out.x = x;
             out.y = y;
+            out.z = z;
             return out;
         }
-        return new Coordinate(x, y);
+        return new Coordinate(x, y, z);
     },
 
     unproject: function (pLnglat: Coordinate, out?: Coordinate) {
@@ -60,12 +62,14 @@ const EPSG3857Projection = {
         // const ry = wrap(c, -this.maxLatitude, this.maxLatitude);
         const rx = x;
         const ry = c;
+        const rz = pLnglat.z;
         if (out) {
             out.x = rx;
             out.y = ry;
+            out.z = rz;
             return out;
         }
-        return new Coordinate(rx, ry);
+        return new Coordinate(rx, ry, rz);
     }
 };
 
diff --git a/src/geo/projection/Projection.EPSG4326.ts b/src/geo/projection/Projection.EPSG4326.ts
index c627a77b2f..a366e991d6 100644
--- a/src/geo/projection/Projection.EPSG4326.ts
+++ b/src/geo/projection/Projection.EPSG4326.ts
@@ -14,6 +14,7 @@ const EPSG4326Projection = {
         if (out) {
             out.x = p.x;
             out.y = p.y;
+            out.z = p.z;
             return out;
         }
         return new Coordinate(p);
@@ -22,6 +23,7 @@ const EPSG4326Projection = {
         if (out) {
             out.x = p.x;
             out.y = p.y;
+            out.z = p.z;
             return out;
         }
         return new Coordinate(p);
diff --git a/src/geo/projection/Projection.EPSG9807.ts b/src/geo/projection/Projection.EPSG9807.ts
index a56716017a..9fbeb4eba9 100644
--- a/src/geo/projection/Projection.EPSG9807.ts
+++ b/src/geo/projection/Projection.EPSG9807.ts
@@ -71,12 +71,14 @@ const EPSG9807Projection = {
                 P.fwd(lp, xy);
                 const x = P.a * xy.x + P.x0 - originX;
                 const y = P.a * xy.y + P.y0 - originY;
+                const z = p.z;
                 if (out) {
                     out.x = x;
                     out.y = y;
+                    out.z = z;
                     return out;
                 }
-                return new Coordinate(x, y);
+                return new Coordinate(x, y, z);
             },
             unproject: function (p: Coordinate, out?: Coordinate): Coordinate {
                 xy.x = (p.x - P.x0 + originX) / P.a;
@@ -84,12 +86,14 @@ const EPSG9807Projection = {
                 P.inv(xy, lp);
                 const x = (lp.lam + P.lam0) * RAD_TO_DEG;
                 const y = lp.phi * RAD_TO_DEG;
+                const z = p.z;
                 if (out) {
                     out.x = x;
                     out.y = y;
+                    out.z = z;
                     return out;
                 }
-                return new Coordinate(x, y);
+                return new Coordinate(x, y, z);
             }
         };
 
diff --git a/src/geo/projection/Projection.IDENTITY.ts b/src/geo/projection/Projection.IDENTITY.ts
index 8621c3f819..d1f2d2dd03 100644
--- a/src/geo/projection/Projection.IDENTITY.ts
+++ b/src/geo/projection/Projection.IDENTITY.ts
@@ -13,6 +13,7 @@ const IdentityProjection = {
         if (out) {
             out.x = p.x;
             out.y = p.y;
+            out.z = p.z;
             return out;
         }
         return p.copy();
@@ -21,6 +22,7 @@ const IdentityProjection = {
         if (out) {
             out.x = p.x;
             out.y = p.y;
+            out.z = p.z;
             return out;
         }
         return p.copy();