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:

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

All available properties are defined below:





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


Defines the overlay to be used in Search by Area.

1 = True


Sets the maximum status the overlay can be set to when toggling on and off.

1 = visible
2 = hittable
3 = editable


Allows a download for the results of Search by Area.

1 = True


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


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


Defines the type of Local Knowledge query the overlay will be used in.



Runs an if query on the result of a Local Knowledge Statistic query.

A valid Iif statement


Used in a Local Knowledge distance query to define a search radius.

Search distance in current units


Used in a Local Knowledge Statistic query to define the overlay column on which the expression will be executed. e.g. Incident_Count#


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.


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?


Used to filter the results of a Local Knowledge Query.

Filter expression.


Used in a Local knowledge NearestN query to define the number of items you want to return.

Number of items to be returned (integer).


Allows information from an INSPIRE metadata record to be viewed within Cadcorp SIS WebMap.

Metadata record name.


Used to support one to many relationships in SIS cursor datasets.

1 = True