Create an Overlay Property

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

Remember to set these Properties in Cadcorp SIS Desktop so they can be accessed 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:

Property	Description	Value
WML::Ignore&	Hides overlay so it is not visible 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 does not 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_Skewness - Reduces any positive or negative skewing of the results. OP_Variance - The average of the squared differences from the Mean value. .OP_Stddev - (Standard Deviation) a measure of the spread of the results. OP_Max - The maximum result value OP_Mode - The number which appears most often in the results. OP_Median - The middle number in the list of results. OP_Mean - The average of the results. OP_Min - The minimum result value. OP_Sum - The sum of the results. OP_Count - The number of 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.	Available Values 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::Attribution$	Used to set the copyright value on GeognoSIS SWD layers only.	Free text.
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::AllowTableExport&	Allow query results table to be downloaded to a csv file. This works in conjunction with the property below. WML::QueryEnabled@ can be set to true (overlay will be created) and WML::AllowTableExport& = 0 (overlay is created but no attribute results are returned).	0 = Table view disallowed 1 = Table view allowed 2 = Table view and export to csv allowed
WML::AllowVectorExport@	Allow layers to be exported to GeoJSON. The Drawing Layer is automatically enabled for vector export.	1 = True
WML::UseVector@	Boolean type. Set to True to use WML::VectorStyle$ property	1 = True
WML::VectorStyle$	The value is a JSON object with the style to be applied for the highlight	Example used in Sample SWD, on Ancient Woodland Overlay: {"fill":{"colour":{"r":0,"g":128,"b":0,"a":0.6}},"stroke":{"colour":{"r":0,"g":0,"b":0,"a":1},"width":2}}
WML::GeometryOptions$	JSON string which defines settings for the editable layer. The geometry type for the overlay should be set to polygon using "geometryType": "Polygon" NOTE – Use a capital P when defining Polygon.	For Example: {"icon": "mdi-shape-polygon-plus","geometryType": "Polygon","textKey": "Polygon","displayColumn": "AString"}
WML::AllowWebEditing@	Determines if a layer is editable. Boolean Type and must be set to True.	1 = True
WML::RefreshInterval&	Refreshes live location data at regular set intervals. Can be used on spatial data, datasets (e.g. View Points) and other data types.	Number of seconds between each refresh. (Long integer)
WML::QueryEnabled@	Determines if a layer can be queried. Boolean Type set to True.	1 = True
WML::MaxStatus&	Sets the overlay status for WebMap. If this property is undefined, a default value of 2 (hittable) is assumed. Ensure the status of the overlay matches the property in the SWD and the value is at least 1.	0 = Invisible 1 = Visible 2 = Hittable 3 = Editable

Updated Properties in WebMap v9.1

There are minor changes to a few properties in WebMap v9.1. The layer property name or value (or both) may be different to v9 usage but the nature of the property remains unchanged.

WML::AllowEdit& is now WML::AllowWebEditing@

WML::SearchEnabled& is now WML::QueryEnabled@

WML::DownloadEnabled& is now WML::AllowTableExport&

WML::VisibleOnly& is now WML::MaxStatus&