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How can a legend entry be displayed as a thematic in a M.App Enteriprise Desktop M.App?
Working with Tutorial: How to display thematic legend entry in Desktop M.Apps
Displaying thematic legend entries in Desktop M.Apps requires the use of Symbology filters. Knowing attribute values by which the dataset will be classified leads to a step by step process in creating a thematic display of the legend entry.
Start by importing the attached SQL dataset (Crimes.zip) into your database. Microsoft SQL Server spatial data is used as the example for this tutorial. The coordinate system used is EPSG:3857.
Knowing the data
The ‘Crime’ table contains an attribute ‘rucr_ext_d’ which identifies the types of crimes committed. There are five possible values for this attribute: ASSAULT, ROBBERY, THEFT OF VEHICLE, THEFT FROM VEHICLE and BREAK AND ENTER.
From the left side menu select ‘Stylesets’ followed by selecting ‘NEW’ and provide a Name (Crime) to the Styleset before saving it.
Select Edit from the Styleset to open the list of possible Vector Layers to be styled
From this list find ‘Crime’ and choose ‘New Style’ to bring up the feature symbolizer
Here we can add the filters for each of the possible values of ‘rucr_ext_d’ attribute thus creating the thematic display of the ‘Crime’ legend entry. Notice that ‘No filter’ is currently the only (default) option and choose ‘Add filter’ to begin with first filter.
The name of the Filter changes to be ‘New filter’ so it needs to be updated by putting the cursor to this box and typing an informative name. For the first filter use ‘ASSAULT’. Underneath the name input the filter statement to have it apply to ‘[rucr_ext_d] = ‘ASSAULT’. Add the ‘Point’ symbolizer and choose ‘Filled Mark’ to stylize the ASSAULT points from this vector layer.
Repeat steps 4 and 5 adding filters for the four remaining possible values: ROBBERY, THEFT FROM VEHICLE, THEFT OF VEHICLE and BREAK AND ENTER. Filter statements: Robbery >>>[rucr_ext_d] = ‘ROBBERY’ Theft of Vehicle >>>[rucr_ext_d] = ‘THEFT OF VEHICLE’ B and E >>>[rucr_ext_d] = BREAK AND ENTER’ Theft from Vehicle >>>[rucr_ext_d] = ‘THEFT FROM VEHICLE’
Choose ‘Save’ to apply the filters
Ensure your ‘Crime’ vector layer has been added to a Desktop Legend and add the ‘Crime’ styleset to a Desktop M.App *For more information on creating a Desktop Legend please see the M.App Enterprise product documentation.
View the Thematic display of the legend entry by opening the Desktop M.App via a user with a Role specified to use this M.App.