Function Description

Manage Mosaic Dataset of images can be regarded as the process of image warehousing, which is to add images to Mosaic Dataset, and multiple images in different formats (.tif.tiff.img) can be added to the same Mosaic Dataset. And a large numb of images can be adde at a time.

Storage is efficient because Mosaic Dataset does not copy the original image file, but records the path, contour, resolution and other meta-information of the image.

Function entrance

• Start tab-> Create Dataset drop-down box-> Raster/Image/Video-> Tessellation.
• Workspace Manager-> Datasource Context Menu-> Create Dataset-> Mosaic.
• Toolbox-> Image Management-> Build Mosaic Dataset-> Build Mosaic Dataset.

Operating instructions

The clipping shape of each image is a face object and is separately stored in a shapefile file. The File Name is the same as the Image File Name. The *.shp File must be stored in the same level directory of the corresponding Image Files. For a more detailed description of the crop file, see Crop Display Method .

1. Right-click the Datasource, select Create Dataset from the Context Menu, and then select Tessellation. The Add Mosaic Dataset dialog box pops up.
2. You can add and delete Image Files through the tool in the toolbar. Mosaic Dataset will record the absolute path information of Add image file.
   • Add: Add Drop-down Button contains the following addition options:
     • Add File: Adds the specified Image Files (*.img, *.tif, *.tiff, etc.) to the current list area. Support adding *.tif, *.tiff, *.imgImage Files in Cloud Storage.
     • Add Folder: Add all Image Files under the specified folder. When Add image file by means of Add Folder, Uniform Settings can be set for the Search files in subfolders of Image Files. Image File Types supported to be added include: IMG File, TIFF File, ECW File and SID File. Support for adding folder paths in Cloud Storage.
     • Add List: Add the specified list file (*.txt, *.tif, *.tiff, etc.), and the program will add all the images it contains to the current list area according to the list information. The path information of Image Files in Cloud Storage can be written in the manifest file *.txt, and the path format is://minio @ image/ChinaPart1/H47C001004.tif, Refer to Cloud Storage for detailed instructions.
     • Add Mosaic Data: Add the image information in the existing Mosaic Data? Get Data set.
     • Add FTP Address: Add the FTP server path to obtain the Image Files in the FTP server.
   • Delete: Delete images that do not need to be added to Mosaic Dataset.
   • The child Dataset List area displays the Basic Info of the added child Dataset, including:
     • Alias: The name of the child Dataset as it will appear in this collection when added to the Image Dataset Collection.
     • Path: Displays the disk path where Image Files is located.
3. Set the Datasource and Dataset Name where the Mosaic Dataset is stored.
4. Set the crop file, which is often used for Image Data to cause deformation after Projection Transformation, and process the no-value area by reference to the data set crop.
   The Vector File that stores the face object in the image clipping area when the file is
   • clipped. The commonly used clipping File Type is shapefile file.
   There is a one-to-one relationship between an
   • image and its clipping file, that is, each image is clipped and stored in an independent.shp File, and the name of the.shp File has the same name as the corresponding Image File, for example, Image File Name is the image. TIF. The corresponding clipping File Name should be a image. SHP. To use a crop file, it must be stored under the statistics directory with the Image Files.
   • Uncheck the Add Clip File: check box to crop the active area of the displayed image with the help of the Mosaic Dataset crop child Dataset. The reference file is *.shp format data. If there is a corresponding *.shp File in the Image Files folder, check this box, otherwise the program calls the Footprint Data of each image as Clip Bounds by default.
5. Set the Target Coordinate System. After the Add image file, Application will set the Coordinate System Settings of the first file with a coordinate system to be added as the coordinate system of the current Mosaic Dataset. At the same time, Reset Coordinate System and Copy Coordinate System in the Coordinate System Settings toolbar are supported. Set Coordinate System in three ways such as Import Coordinate System. Refer to View Image Projection for the Mosaic Dataset coordinate system settings.
6. Click the OK button to finish creating the Mosaic Dataset. Add the nodes of the created Mosaic Dataset under the Workspace ManagerData source node, which are Outline, Boundary and Clipping.
   • Contour is the basis for Mosaic Dataset to store and organize Image Files. It is a Region Dataset, and each face object is the Geographic Range of a single image, as shown in the following figure. The distribution and coverage of the image can be viewed globally through the outline.

     Figure: Global's 30m resolution DEM Data (Mosaic Dataset Profile)

     In addition to the Geographic Range, the outline also manages meta-information such as the storage location of each Image File and the maximum and minimum resolutions of the pyramid, as shown in the following figure. In practical applications, the contour may also need to manage other information of the image, such as the shooting time of each image, the manufacturer, etc., which can be achieved by creating a user field and updating the field.

     Figure: Profile Dataset Properties Table

   • Boundary is the Region Dataset, in which the face object can be used to set the Visible Bounds of Mosaic Dataset. It is built based on the contour by default; You can also use Custom Bounds or the specified GeometryRebuild Boundary to make the Mosaic Dataset display the image within the boundary according to the new boundary.
   • Clipping is Region Dataset, in which the object is the Visible Bounds controlling each image. It is generated based on the clipping file selected during Build Mosaic Dataset. If there is no separate clipping file, it is created based on the image outline by default.
7. In Layer Manager, a Mosaic Dataset consists of four parts: a boundary line, a callout, an outline, and an image. As shown in the figure below, the Mosaic Dataset contains 6 Image Datasets, which are displayed in the Map. The pink wireframe is the boundary line, the green line is the contour line, and the bottom is the image Dataset displayed in the mosaic.

   Figure: Mosaic Dataset Structure

   • Contour: The image contour is based on the spatial reference of the Mosaic Dataset, which reflects the real boundary of the image in the Mosaic Dataset.
   • Boundary line: It is constructed based on the image contour line. You can dynamically change the overall display of the Mosaic Dataset by adjusting the Boundary line range. Under specific requirements, the original Mosaic Dataset boundaries can be replaced with existing vector boundaries or administrative divisions to change the data display.
   • Image: Add all images managed in Mosaic Dataset and display them together dynamically.
   • Annotation: File Name added to each Original Image in Mosaic Dataset.

Related topics

Overview of Mosaic Dataset

Mosaic Dataset Display