Whether the Layer type is vector, raster, or image, you can set the transparency, order, visible scale, and filter display objects of the layer.

Sets the layer transparency

Transparency is a display property of a layer and can be set in the spin box of Transparency on the Layer Properties panel.

The spin box of transparency can set the transparency of the current layer, or directly input the transparency value to browse the setting results in real time. The default transparency value is 0, which means the layer is completely opaque. As the value increases, the layer becomes more transparent. When the transparency value is set to 100, the layer is completely transparent. The transparency value is an integer between 0 and 100.

Adjust the layer order

The ordering of the stacking order of the layers directly affects the map Display Effects. Generally, there are two rules for the order of map layers:

• According to the Map Bounds of the object, the order of From Top to Bottom is: small-> medium-> large;
• Depending on the type of layer, From Top to Bottom is: Text to Point-> Line to Region.

The following two maps show the map effect before and after a certain layer (RoadLine) is placed on the bottom. From these two maps, it is clear that the importance of the order of the layers to the display of the map.

Map Display Effects Before Layer Adjustment	Map Display Effects After Layer Adjustment

As you can see from the image above, a line layer has "disappeared" from the map. Instead of being removed, it has been moved to the bottom layer and displayed at the bottom.

There are two main ways to adjust the layer order:

• Using Layer Control

  Proceed as follows:

  Open the Layer Control dialog by performing one of the following steps
  1. if there is an open map in the Current Works pace.
     • In Layer Manager, click the Layer Control button.
     • In Layer Manager, right-click any layer and select the Layer Control command.
  2. On the Layer Control dialog, with one or more layers selected, adjust the layer order by clicking buttons such as Top, Move Up, Move Down, and Bottom on the toolbar. For details about Layer Control, see Layer Control.
• Direct drag

  The operation steps are as follows:

  1. In Layer Manager, select one or more layers.
  Drag
  2. the selected layer to the target location.
  3. Release the mouse.

Layer Blend Mode

Blend Mode is used to set the overlay mode between two layers. The color of the upper layer and the color of the lower layer are overlaid and calculated to obtain different shading effects. The specific effect depends on the selected mode.

The models provided are as follows:

Pattern category	Mode name	Explain
Regular mode	Ordinary	Does not change the layer color and is the default blending type.
Delight	Darkening	Compare the color of the layer with the color of the layer below, and choose the minimum RGB value of the two layers as the final rendering color.
	Multiply	Multiplying the color of a layer by the color of the underlying layer usually results in a darker color in the final render.
	Deepen Color	Darken the color of the lower layer. White does not change.
	Linetype deepen	The layer color is added to the color of the underlying layer and then subtracted by a value of 1.
Remove Darkness	Brighten	Compare the color of the layer with the color of the layer below, and select the maximum RGB value of the two layers as the final rendering color.
	Filter color	Subtracts and multiplies the white area of the layer below.
	Color Reduction	Decreases the contrast between the layer and the underlying layer, and increases the brightness of the underlying layer. Black does not change.
	Linear Reduction	Add the brightness of the layer and the layer below. The black does not change.
Contrast	Overlay	Multiplies the areas of the lower layer with a color value less than 0.5 by the blending layer, and blends the areas with a color value greater than 0.5 with the blending layer in filter mode.
	Soft light	Same algorithm as Overlay mode, but with reduced layer color contrast.
	Strong light	Areas with a layer color value less than 0.5 are multiplied by the layer below, and areas greater than 0.5 are in filter mode.
	Bright light	Is a combination of Color Reduction and Deepen Color.
	Linear light	If the color brightness of the mixed layer is higher than 0.5, the picture becomes brighter, and if the color brightness is lower than 0.5, the picture becomes darker.
	Point light	If the current layer color is lighter than 50% gray, pixels darker than current layer color are replaced; if the current layer color is darker than 50% gray, pixels lighter than current layer color are replaced.
Difference	Difference	Subtract the color value of the lower layer from the color value of the upper layer, then divide the result by 2, and finally add the color value of the lower layer. Get the effect that the color of the upper layer is the opposite of the color of the lower layer.
	Minus	Subtract the color of the upper layer from the color of the lower layer to get the subtracted color.

Set the Fill Mode

Fill Mode is used to control the drawing mode of fill symbol, supports global mode and object mode, and enriches the expression of fill symbol in the map.

Application Example

Case description: Taking the Fill Mode of all prefecture-level cities in Sichuan Province as an example, you can set the face object fill symbol mode as the global mode or object mode to enrich the expression of fill symbol.

Data description: Region Dataset.

Main operation steps

1. Select the surface layer that needs fill symbol in Layer Manager, and select the required fill symbol style in the Style Settings tab-> Fill Style group-> Fill symbol drop-down box.
2. Select the layer in Layer Manager for which the Fill Mode needs to be set, click Context Menu-> select Layer Properties.
3. Display Control-> Fill Mode in the Layer Properties window to select Global fill or Object fill.
4. Depending on the Fill Mode selected, the resulting effect is different, as shown below:
   • Left Global Mode: Draw based on the upper left corner of the entire layer, so that the Fill symbol is filled according to the entire layer.
   • Figure on the right Object Mode: Start drawing based on the upper left corner of each object, and use the Fill symbol to fill a single Object in the layer.

Set Layer Visible Scale Range

Filter objects in the layer by setting the Layer Properties visible scale bar or Set Filter.

Minimum Visible Scale

Min Visible Scale: The combo box is used to set the Minimum Visible Scale of the current layer. After Layer Settings Minimum Visible Scale, if the scale of the map is smaller than Minimum Visible Scale of the Layer Settings, the layer will not be visible.

Maximum Visible Scale

Max Visible Scale: The combo box is used to set the Maximum Visible Scale of the current layer. After Layer Settings Maximum Visible Scale, if the scale of the map is larger than Maximum Visible Scale set for the layer, the layer will not be visible.

Displays the Filter

Filter Expression: It is used to set the display filter of the current layer to filter which objects in the layer can be displayed and which objects cannot be displayed, so that the user can display the elements of interest and filter out the elements that do not need to be displayed temporarily.

The user can enter SQL Expression as the Filter in the Display Filter text box, and click the Enter key to apply the Filter of the layer, so that the objects meeting the Filter in the layer are visible; You can also click the button on the right of the text box to create a Filter Expression in the pop-up SQL Expression dialog , and then click the OK button to apply the Filter of the layer. Makes objects in the layer that satisfy the Filter visible.

Click The Set Join Attribute Table.. Button to pop up a Relate Table Settings "Dialog , and connect to the external table through the associated field. And then filter the content in the display layer by constructing a Filter with the participation of an external table field.