1 files changed, 56 insertions, 0 deletions
diff --git a/src/projections/PJ_urm5.cpp b/src/projections/PJ_urm5.cpp
new file mode 100644
index 00000000..0e3c7e3c
--- /dev/null
+++ b/src/projections/PJ_urm5.cpp
@@ -0,0 +1,56 @@
+#define PJ_LIB__
+
+#include <errno.h>
+#include <math.h>
+
+#include "proj.h"
+#include "projects.h"
+
+PROJ_HEAD(urm5, "Urmaev V") "\n\tPCyl, Sph, no inv\n\tn= q= alpha=";
+
+namespace { // anonymous namespace
+struct pj_opaque {
+    double m, rmn, q3, n;
+};
+} // anonymous namespace
+
+
+static XY s_forward (LP lp, PJ *P) {           /* Spheroidal, forward */
+    XY xy = {0.0, 0.0};
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(P->opaque);
+    double t;
+
+    t = lp.phi = aasin (P->ctx, Q->n * sin (lp.phi));
+    xy.x = Q->m * lp.lam * cos (lp.phi);
+    t *= t;
+    xy.y = lp.phi * (1. + t * Q->q3) * Q->rmn;
+    return xy;
+}
+
+
+PJ *PROJECTION(urm5) {
+    double alpha, t;
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(pj_calloc (1, sizeof (struct pj_opaque)));
+    if (nullptr==Q)
+        return pj_default_destructor(P, ENOMEM);
+    P->opaque = Q;
+
+    if (pj_param(P->ctx, P->params, "tn").i) {
+        Q->n = pj_param(P->ctx, P->params, "dn").f;
+        if (Q->n <= 0. || Q->n > 1.)
+            return pj_default_destructor(P, PJD_ERR_N_OUT_OF_RANGE);
+    } else {
+            return pj_default_destructor(P, PJD_ERR_N_OUT_OF_RANGE);
+    }
+    Q->q3 = pj_param(P->ctx, P->params, "dq").f / 3.;
+    alpha = pj_param(P->ctx, P->params, "ralpha").f;
+    t = Q->n * sin (alpha);
+    Q->m = cos (alpha) / sqrt (1. - t * t);
+    Q->rmn = 1. / (Q->m * Q->n);
+
+    P->es = 0.;
+    P->inv = nullptr;
+    P->fwd = s_forward;
+
+    return P;
+}