diff --git a/ordinarykriging/type.go b/ordinarykriging/type.go
index 75e1859..13823e3 100644
--- a/ordinarykriging/type.go
+++ b/ordinarykriging/type.go
@@ -55,7 +55,7 @@ func (t DistanceList) Swap(i, j int) {
 }
 
 type GridMatrices struct {
-	Data  [][]float64 `json:"tempdata"`
+	Data  [][]float64 `json:"data"`
 	Width float64     `json:"width"`
 	Xlim  [2]float64  `json:"xLim"`
 	Ylim  [2]float64  `json:"yLim"`