Function Description

Layers include point layers, line layers, polygon layers, text layers, grid/image layers, thematic map layers, layer groups, etc. All layers are displayed stacked in the layer manager. You can control the map layers through the buttons in the Layer Control drop-down button in the layer manager, including Layer Control and Layer nodes can be dragged.

• Layer Control: Layer control is used to control the state and attributes of individual or multiple layers in the map. The Layer Control dialog box displays all layers in the current map and the state and attributes of each layer. Users can modify the layer state, including whether it is visible, selectable, editable, snappable, whether symbols scale with map zoom, scale, and other display styles, adjust layer order, add or remove layers, etc.
• Layer nodes can be dragged: Sets whether layer nodes can be dragged. Users can fix the layer order in the layer manager to prevent misoperations caused by dragging when there are too many layers.

Functional Entry

• Layer Manager->layer context menu->Layer Control.

Parameter description

• The Layer Control dialog box consists of three parts: toolbar, layer list, and function setting area:
  • Toolbar: Provides common tools such as add layer, remove layer, select all layers, invert selection, etc. It also provides tools like bring to top, move up, move down, send to bottom to adjust the display order of layers.
  • Layer list: Lists all layers in the current map and their display order. Combined with the bring to top, move up, move down, and send to bottom tools in the toolbar, you can adjust the order of layers in the list.
  • Function setting area: For different data types, the function setting area provides corresponding operations to help you control the state and attributes of layers.
• Visible: Used to control the visibility of vector layers. Check the checkbox in front of Visible to indicate that the layer is visible; otherwise, it is invisible. If Visible is unchecked, Selectable, Editable, and Snappable settings are unavailable.
• Selectable: Used to control whether the layer is selectable, i.e., whether objects in the layer can be selected. Check the checkbox in front of Selectable to indicate that the layer is selectable; otherwise, it is not selectable.
• Editable: Used to control whether the vector layer is editable, i.e., whether objects in the layer can be edited. Click the checkbox in front of Editable to indicate that the layer is editable; otherwise, it is not editable.
• Snappable: Used to control whether the vector layer is snappable, i.e., whether objects in the layer can be snapped during operations like selection or editing.
• Layer Name: Used to display the layer name. The layer name cannot be modified; it uniquely identifies the layer in the map where the layer resides.
• Layer Caption: Used to display the layer caption. You can modify the layer caption; after modification, the display name in the layer manager changes, but the name of the corresponding dataset in the workspace manager remains unchanged.
• Transparency:: Used to set the transparency of the layer. Enter a transparency value in the text box on the right or click the arrow symbol, then drag the slider in the pop-up transparency settings to adjust the layer transparency. The transparency value is an integer between 0 and 100. 0 represents opaque, and 100 represents fully transparent.
• Blend Mode: Used to set the overlay method between two layers by blending the colors of the upper layer with the lower layer to achieve different shading effects, depending on the selected mode. For details, refer to Set Layer Common Properties.
• Fill Mode: Used to control the drawing method of symbols, supporting global mode and object mode to enrich the expression of symbols in the map. For details, refer to Set Layer Common Properties.
• Weight: Used to set the display order of label layers and text layers. A higher weight value gives the layer higher display priority. Commonly used for display control when multiple label or text layers exist at the same location.
  Note:

  This function requires first checking the Label Always Top checkbox under the map properties panel.

• Minimum Visible Scale: Sets the minimum visible scale for the selected layer. Enter the scale value in the text box on the right, e.g., 1:500000, or click the drop-down button to select the corresponding scale for setting. After setting the minimum visible scale for the layer, if the map scale is smaller than the set minimum visible scale, the selected layer will be invisible. The default value is 1:0, meaning no minimum visible scale is set for the layer.
• Maximum Visible Scale: Sets the maximum visible scale for the selected layer. Enter the scale value in the text box on the right, e.g., 1:100000, or click the drop-down button to select the corresponding scale for setting. After setting the maximum visible scale for the layer, if the map scale is larger than the set maximum visible scale, the selected layer will be invisible. The default value is 1:0, meaning no maximum visible scale is set for the layer.
• Change Dataset: Used to reassign the referenced dataset for the current layer, i.e., associate it to display the specified new dataset. Click the button on the right side of the text box, and in the pop-up change dataset dialog, you can reassign a new referenced dataset. Click the drop-down arrows next to datasource and dataset to select the dataset to reference and the datasource it belongs to. For more information, refer to: Change Dataset.
• vector parameters: When a vector layer is selected, vector parameter settings appear, including show full line, intersection, scale with map, minimum object size, display filter, etc. For detailed parameter descriptions, refer to Set Vector Layer Properties.
• image parameters: When an image layer is selected, image parameter settings appear, including brightness, contrast, transparent color, interpolation method, display method, and stretching for the image layer. For detailed parameter descriptions, refer to Set Image Layer Properties.
• grid parameters: When a raster layer is selected, grid parameter settings appear, including brightness, contrast, color table, specified raster value style, raster function, etc., for the raster layer. For detailed parameter descriptions, refer to Set Raster Layer Properties.

Related Topics

Set Layer Properties