When the Mosaic DatasetAdd to Map is displayed in the window, the Mosaic Dataset containing a large amount of Image Data is displayed in the Map, the initial display is Full View, and only the outline of the mosaic image is displayed, so that after the map is enlarged to a certain scale, Mosaic Dataset will dynamically read the Image Files in the range according to the current Visible Bounds:, and perform dynamic splicing display. Browsing may be slow for the first time, but after browsing, the system will build a cache, which is very efficient when browsing again.
 |
| Figure: Full View Mosaic Dataset. |
When the user needs a global overview of the effect of image stitching, the Mosaic Dataset overview can be constructed to display the image stitching results at a small scale. Please check the Manage Mosaic Data set page for actions related to Build Overview.
 |
| Figure: Full View Mosaic Dataset (Built Overview) |
Remove Image No Value
In addition, after some Remote Sensing Imagery are corrected, there will be areas without values, which will affect the mosaic Display Effects of the image. Users can remove these areas without values through the relevant settings. There are two kinds of no-value cases in the image, one is the no-value inside the image (Figure 1), and the other is the no-value outside the effective area of the image due to correction (Figure 2).
 |
The non-value area generated by image correction affects the effect of image mosaic display and needs to be removed; the non-value area of the data itself generally does not need to be displayed and needs to be removed. There are two ways to remove no value: No Value Transparent and clipping Display Method. Select the appropriate way to remove no value according to the specific situation of no value.
 |
- No Value Transparent Mode: The No Value Transparent mode can be used to remove the non-value of the data itself. The method is very simple. In Layer Manager, select the Mosaic DatasetImage Layer. Open the Layer Properties panel, and the specification of no value in the Properties Panel is different according to different image bands: for single-band images, you can directly specify no value; for multi-band images, the value of no value is the RGB value after multi-band synthesis. After setting no value, you can check No Value Transparent to remove the no value area.
- Crop Display Image After
obtaining the image clipping area, you can use the clipping area to control the image to display only its Valid Range. The specific operation is: in the Properties Panel of Image Layer, Advance Settings-& gt; Clip Type is set to Dataset Clip. In this case, the display image is clipped with the clip child Dataset.
value resulting from removing the correction
Figure: Crop shows no
Displays the Effect Settings
Mosaic Dataset Image Display Effect Settings is basically the same as the normal Image Settings. The adjustment of general Mosaic Dataset image Display Effects includes: special value display, Color Table Display, Stretch Display, etc., and the raster function can also be set. Quickly get 3D Hillshade Map and orthophoto map effects. Mosaic Dataset Image Display Effect Settings are implemented through the Image Layer Properties panel.
 |
| Figure: Special Value Display Effect Settings |
 |
| Figure: Color Table Display |
 |
| Image: Stretch Display |
 |
| Figure: Applying the 3D Hillshade Map raster function |
- Display of special value: For the special value of the image, it can be processed as transparent or displayed with Other Color. Through the background value setting of the image Layer Properties panel, the special value form for the multi-band image is the RGB value after the three-band synthesis; After determining the crop area, select special values Display Effects, select the Background Transparency Special Value Transparent Display, or Choose Color instead of Display Special Values.
- Color Table Display: The Manage Mosaic Dataset is DEM Data, and the Color Table Display of elevation classification can be used, which is intuitive and beautiful.
- Image Stretching Display: With Stretch Display, images can be displayed more clearly, and stretching and color tables can be superimposed.
- Grid Function Display: 3D Hillshade Map and Orthophoto Map Display Effects can be quickly obtained through the raster function in case of Manage Mosaic DatasetDEM Data, especially for large-scale data.
Visible Bounds: settings
- With the Image Layer Display Filter setting, you can filter and display part of the image in the Mosaic Image. The Display Filter is constructed using the Property Field of the Contour Dataset.
- Through Mosaic Dataset, we can quickly configure the Image Map of the whole country and even the whole world. However, sometimes we need to display the image of the local scope. For example, the Image Map only displays the image of Hebei Province. You can use the boundary sub-Dataset of Mosaic Dataset to implement it quickly.
- Border Dataset controls Mosaic Dataset's Visible Bounds:, built by default based on contours. Here, we can set the Rebuild Bounds based on the Region DatasetRebuild Boundary of the administrative divisions of Hebei Province, or in other ways, such as drawing Arbitrary Polygon or surface objects in Select Map. After the boundary reconstruction, the boundary will be updated to the administrative boundary of Hebei Province.
Rebuild Boundary based on face object
Figure: Rebuild Boundary 
Figure: Before and after - You also need to set the crop type to Boundary Clip in the image Layer Properties panel to crop and display the image in Hebei. Rebuild Boundary based on face object
Figure: Before and after
Display Order settings
The Display Order of Mosaic Image can be set through the Display Order setting of the Image Layer object, which is essentially to control the Display Order of the image by modifying the value of the Sm ZOrder field in the Region Dataset of the image outline. See the Object Display Order Field for the Detail Description of the object Display Order.
 |
| Figure: Setting different Display Order |
Displays performance optimizations
There are three ways to improve the display efficiency of Mosaic Dataset:
- To improve the display efficiency of Mosaic Dataset mosaic images, the most basic processing method is Create Image Pyramid. Mosaic Dataset can create Pyramid for the managed images in batches. See the Manage Mosaic Dataset page for a Detail Description of the Create Pyramid.
- Turn on file handle caching for Image Files in Mosaic Dataset:
File handle cache: It refers to the cache of the file handle of Image Files in the current Mosaic Dataset. The program will open the file handle of Image Files by default to start reading every time the Mosaic Dataset is displayed, which will cause performance loss. Resulting in reduced rendering performance. Opening the file handle cache can reduce the operation of Open File handle and improve the performance. However, caching the file handle will increase the memory, so the default value is 100 (files), which can be adjusted according to the number of Mosaic Dataset files and the performance of the machine.
Related topics