--- a/pkg/imports/sr.go	Tue Jul 06 00:30:39 2021 +0200
+++ b/pkg/imports/sr.go	Tue Jul 06 01:20:44 2021 +0200
@@ -58,8 +58,8 @@
 	// DepthReference if given overides the DepthReference value
 	// from the meta.json.
 	DepthReference *string `json:"depth-reference,omitempty"`
-	// SingleBeam indicates that the sounding is a single beam scan.
-	SingleBeam *bool `json:"single-beam,omitempty"`
+	// SurveyType indicates that the sounding is a single beam scan.
+	SurveyType *models.SurveyType `json:"survey-type,omitempty"`
 	// NegateZ indicated that the Z values of thy XYZ input should be
 	// multiplied by -1.
 	NegateZ *bool `json:"negate-z,omitempty"`
@@ -240,15 +240,15 @@
 	return strings.Join(descs, "|"), nil
 }
 
-func (sr *SoundingResult) singleBeam() bool {
-	return sr.SingleBeam != nil && *sr.SingleBeam
+func (sr *SoundingResult) surveyType() models.SurveyType {
+	if sr.SurveyType != nil {
+		return *sr.SurveyType
+	}
+	return models.SurveyTypeMultiBeam
 }
 
 func (sr *SoundingResult) surtype() string {
-	if sr.singleBeam() {
-		return "single"
-	}
-	return "multi"
+	return string(sr.surveyType())
 }
 
 func (sr *SoundingResult) negateZ() bool {
@@ -419,11 +419,7 @@
 	zpgException bool,
 ) (interface{}, error) {
 
-	if sr.singleBeam() {
-		feedback.Info("Processing as single beam scan.")
-	} else {
-		feedback.Info("Processing as multi beam scan.")
-	}
+	feedback.Info("Processing as %s beam scan.", sr.surtype())
 
 	feedback.Info("Reproject XYZ data.")
 
@@ -532,7 +528,12 @@
 		removed = str.Clip(&clippingPolygon)
 	}
 
-	if sr.singleBeam() {
+	switch sr.surveyType() {
+	case models.SurveyTypeMarking:
+		// TODO: Implement me!
+		return nil, errors.New("Not implemented, yet!")
+
+	case models.SurveyTypeSingleBeam:
 
 		origDensity := float64(len(xyz)) / polygonArea
 
@@ -712,7 +713,7 @@
 	return sr.Bottleneck != nil &&
 		sr.Date != nil &&
 		sr.DepthReference != nil &&
-		sr.SingleBeam != nil &&
+		sr.SurveyType != nil &&
 		sr.NegateZ != nil
 }
 
@@ -729,7 +730,7 @@
 			Bottleneck:     *sr.Bottleneck,
 			EPSG:           epsg,
 			DepthReference: *sr.DepthReference,
-			SingleBeam:     sr.singleBeam(),
+			SurveyType:     sr.surveyType(),
 			NegateZ:        sr.negateZ(),
 		}, nil
 	}
@@ -756,8 +757,8 @@
 	if sr.DepthReference != nil {
 		m.DepthReference = *sr.DepthReference
 	}
-	if sr.SingleBeam != nil {
-		m.SingleBeam = *sr.SingleBeam
+	if sr.SurveyType != nil {
+		m.SurveyType = *sr.SurveyType
 	}
 	if sr.NegateZ != nil {
 		m.NegateZ = *sr.NegateZ