diff --git a/pkg/producer/grid_img.go b/pkg/producer/grid_img.go
index 07e8153..a27f12c 100644
--- a/pkg/producer/grid_img.go
+++ b/pkg/producer/grid_img.go
@@ -21,8 +21,9 @@ func gridImage2(m, n, height, width, k, hmin, hmax int) []*GridPoint {
 	hmax = hmax + 500
 	hmin = hmin - 500
 	dh := (hmax - hmin) / (k)
+
 	var h []int
-	for i := 1; i <= k; i++ {
+	for i := 0; i <= k; i++ {
 		h = append(h, hmin+dh*i)
 	}
 
diff --git a/pkg/producer/rpc.go b/pkg/producer/rpc.go
index 7d6a062..a435a4d 100644
--- a/pkg/producer/rpc.go
+++ b/pkg/producer/rpc.go
@@ -56,8 +56,8 @@ type RPCModel struct {
 // rational polynomial coeffients
 func NewRPC(r *Registrator, scene *Scene, rpb string) *RPC {
 	rpc := RPC{
-		elevationLayer: 4,
-		gridsize:       19,
+		elevationLayer: 3,
+		gridsize:       3,
 		registrator:    r,
 		scene:          scene,
 		rpb:            rpb,
diff --git a/pkg/producer/rpc_helper.go b/pkg/producer/rpc_helper.go
index e14cde6..aaa3f4a 100644
--- a/pkg/producer/rpc_helper.go
+++ b/pkg/producer/rpc_helper.go
@@ -70,17 +70,17 @@ func solveCoefficients(f, latVec, lonVec, heightVec *mat.VecDense) ([]float64, e
 		denominator.SetVec(i, x0.AtVec(i+19))
 	}
 
-	num, den, err := solveNelderMead(numerator, denominator, f, latVec, lonVec, heightVec)
-	if err != nil {
-		return nil, err
-	}
+	// num, den, err := solveNelderMead(numerator, denominator, f, latVec, lonVec, heightVec)
+	// if err != nil {
+	// 	return nil, err
+	// }
 
-	var coeffs []float64
-	coeffs = append(coeffs, num.RawVector().Data...)
-	for i := 1; i < 20; i++ {
-		coeffs = append(coeffs, den.AtVec(i))
-	}
-	return coeffs, nil
+	// var coeffs []float64
+	// coeffs = append(coeffs, num.RawVector().Data...)
+	// for i := 1; i < 20; i++ {
+	// 	coeffs = append(coeffs, den.AtVec(i))
+	// }
+	// return coeffs, nil
 
 	// 迭代
 	var wm mat.Dense
@@ -359,11 +359,11 @@ func localize(num, den *mat.VecDense, row, col float64) (P, L, H float64) {
 }
 
 func project(num, den *mat.VecDense, P, L, H float64) (v float64) {
-	v = applyPoly(num, P, L, H) / applyPoly(den, P, L, H)
+	v = applyPolynominal(num, P, L, H) / applyPolynominal(den, P, L, H)
 	return v
 }
 
-func applyPoly(poly *mat.VecDense,
+func applyPolynominal(poly *mat.VecDense,
 	P, L, H float64) (v float64) {
 	v = 0.0
 	v += poly.AtVec(0)
diff --git a/pkg/producer/rpc_optimize.go b/pkg/producer/rpc_optimize.go
index e54575e..51474d4 100644
--- a/pkg/producer/rpc_optimize.go
+++ b/pkg/producer/rpc_optimize.go
@@ -21,7 +21,7 @@ func objectiveFunc(numerator, denominator, f, latVec, lonVec, heightVec *mat.Vec
 		errorV := predictedV - f.AtVec(i)
 		errorSquared += errorV * errorV
 	}
-	return errorSquared / float64(n)
+	return errorSquared
 }
 
 func solveNelderMead(num, den, f, latVec, lonVec, heightVec *mat.VecDense) (*mat.VecDense, *mat.VecDense, error) {