Create an Overlay Property

WebMap uses SWD overlay Properties in different scenarios (for instance: using the overlay in certain services or defining certain parameters to use in a Local Knowledge query).

Remember to set these Properties inside our Cadcorp SIS Desktop application so they can be used inside WebMap.

To do this:

Open the SWD file inside SIS Desktop.
Right click on the overlay in the tree view and select Properties:
Select Properties again and click Add to add a new property:

All available properties are defined below:

Property	Description	Value
WML::AllowSnapping&	Allows the drawing tool to snap to the overlay. Only one overlay is ‘snappable’ at a time. To use this function, Enable Snapping on your WebMap user site.	1 = True
WML::SearchEnabled&	Defines the overlay to be used in Search by Area.	1 = True
WML::VisibleOnly&	Sets the maximum status the overlay can be set to when toggling on and off.	1 = visible 2 = hittable 3 = editable
WML::DownloadEnabled&	Allows a download for the results of Search by Area.	1 = True
WML::Ignore&	Hides overlay so it doesn’t appear in Map Features of a user map. This property is used when printing to PDF. See Setting up the SWD to enable PDF printing.	1 = True
WML::IgnoreHittable&	Hides overlay so it doesn’t appear in Map Features of a user map. However user can still see data in the map window and features can be interrogated for their attributes.	1 = True
WML::Knowledge_Type$	Defines the type of Local Knowledge query the overlay will be used in.	area statistic nearestN distance
WML::Knowledge_AdditionalInfo$	Runs an if query on the result of a Local Knowledge Statistic query.	A valid Iif statement
WML::Knowledge_SearchDistance#	Used in a Local Knowledge distance query to define a search radius.	Search distance in current units
WML::Knowledge_Expression$	Used in a Local Knowledge Statistic query to define the overlay column on which the expression will be executed.	e.g. Incident_Count#
WML::Knowledge_Operation$	Sets the mathematical operation to be carried out for a Local Knowledge Statistic query.	OP_Count - The number of results. OP_Sum - The sum of the results. OP_Min - The minimum result value. OP_Mean - The average of the results. OP_Median - The middle number in the list of results. OP_Mode - The number which appears most often in the results. OP_Max - The maximum result value. OP_Stddev - (Standard Deviation) a measure of the spread of the results. OP_Variance - The average of the squared differences from the Mean value. OP_Skewness - Reduces any positive or negative skewing of the results.
WML::Knowledge_Test$	Used in a Local Knowledge Statistic query to define the spatial relationship between the data and the search area for the resultant statistic.	ST_Contains - Does the data intersect with the search area? ST_Crosses - Does data cross the search area? ST_Disjoint - Is the data disjointed from the search area? ST_Equals - Is the data equal to the search area? ST_Intersect - Does the data intersect the search area? ST_Overlap - Does the data overlap the search area? ST_Touches - Does the data touch the search area? ST_Within - Is the data within the search area?
WML::Knowledge_Filter$	Used to filter the results of a Local Knowledge Query.	Filter expression.
WML::Knowledge_nItems&	Used in a Local knowledge NearestN query to define the number of items you want to return.	Number of items to be returned (integer).
WML::MetadataUUID$	Allows information from an INSPIRE metadata record to be viewed within Cadcorp SIS WebMap.	Metadata record name.
WML::HasJoin&	Used to support one to many relationships in SIS cursor datasets.	1 = True