ah-docs

Trace between Two Points (Upstream to Downstream)

Description

Traces upstream to downstream points. Downstream point needs to be downstream of the upstream point. If not, the trace would return with a warning message.

{
    "displayFieldName": "",
    "features": [
        {
            "attributes": {
                "OBJECTID": 1
            },
            "geometry": {
                "x": -13539581,
                "y": 4462328
            }
        }
    ],
    "fieldAliases": {
        "OBJECTID": "OBJECTID"
    },
    "fields": [
        {
            "alias": "OBJECTID",
            "name": "OBJECTID",
            "type": "esriFieldTypeOID"
        }
    ],
    "geometryType": "esriGeometryPoint",
    "spatialReference": {
        "latestWkid": 3857,
        "wkid": 102100
    }
}

Usage

Parameters

Direction	Type	Parameter Name	Data Type	Dialog Reference
Input	Required	Upstream Point	Feature Set	Upstream Point
Input	Optional	Downstream Point	Feature Set	Downstream Point, Downstream point needs to be downstream of the upstream point.
Input	Required	Input Trace Layer	Feature Layer	Feature class to be used for tracing. Any type of feature class can be used to trace through as long as it has appropriate fields identifying downstream elements, typically, [HYDROID, NextDownID] or [From_Node, To_Node].
Input	Optional	Search Distance	Linear Unit	Distance used to perform spatial selection of trace features used as start and barrier features based on input points. To precisely control the trace fatures to use, best practice is to snap the point onto the trace feature and set the "Search Distance" to 0. Larger search distance can be used to make multiple feature selections with a single point.default value '50 Meters'.
Input	Optional	Snap Input Points	Boolean	Snap_Input_Points = True : Try to snap input points (Input Start Points, Input Barriers) to the lines of Input Trace Layer, Default value=False