1 files changed, 32 insertions, 0 deletions
diff --git a/src/projections/denoy.cpp b/src/projections/denoy.cpp
new file mode 100644
index 00000000..5c337c45
--- /dev/null
+++ b/src/projections/denoy.cpp
@@ -0,0 +1,32 @@
+#define PJ_LIB__
+#include <math.h>
+
+#include "projects.h"
+
+PROJ_HEAD(denoy, "Denoyer Semi-Elliptical") "\n\tPCyl, no inv, Sph";
+
+#define C0  0.95
+#define C1 -0.08333333333333333333
+#define C3  0.00166666666666666666
+#define D1  0.9
+#define D5  0.03
+
+
+static XY s_forward (LP lp, PJ *P) {            /* Spheroidal, forward */
+    XY xy = {0.0, 0.0};
+    (void) P;
+    xy.y = lp.phi;
+    xy.x = lp.lam;
+    lp.lam = fabs(lp.lam);
+    xy.x *= cos((C0 + lp.lam * (C1 + lp.lam * lp.lam * C3)) *
+            (lp.phi * (D1 + D5 * lp.phi * lp.phi * lp.phi * lp.phi)));
+    return xy;
+}
+
+
+PJ *PROJECTION(denoy) {
+    P->es = 0.0;
+    P->fwd = s_forward;
+
+    return P;
+}