Instructions for Use
Filter Image refers to the process of automatically filtering and selecting original images based on criteria such as image extent, acquisition time, resolution, cloud coverage, and duplicate names. This process enables the rapid extraction of high-quality images that meet specific requirements from massive datasets, effectively reducing redundant data. It not only enhances data processing speed but also ensures the accuracy and timeliness of analysis results, thereby meeting the needs of various application scenarios such as topographic mapping, resource investigation, environmental monitoring, and disaster assessment.
Filter Image can quickly eliminate non-compliant data, such as outdated, low-resolution, or heavily cloud-obscured images, ensuring that subsequent analysis is based on high-quality data.
SuperMap ImageX Pro supports this feature starting from the 2025 version.
Function Entry
Imagery Tab -> Image Management Group -> Filter Image.
Operation Instructions
- Click the Imagery Tab -> Image Management Group -> Filter Image button to open the Filter Image panel and the Image Preview window.
- In the Filter Image panel, set filtering parameters such as Image Path, Filter Criteria, and Trim Overlapping Images. Specific descriptions are as follows:
- Image Path: Set the path where the original images are stored. The system will automatically read all image data under this path (including subfolders).
- Filter Criteria: Filter original images based on the following conditions:
- Image Extent: Provides three methods to set the extent, loading only images within the specified range:
- Geographic Range: Define the image extent using Left, Bottom, Right, and Top coordinates in a geographic coordinate system (GCS). Supports copying/pasting coordinates for reuse.
- Range Data: Use the bounds of a specified dataset as the image extent. Supported formats include UDBX/UDB, GeoJSON, or ShapeFile.
- Standard View Frame Number: Enter the frame number at a designated scale, and the image extent will be automatically calculated based on the frame number.
- Acquisition Time: Set the time range for image acquisition. The system automatically reads the time information from image files and loads only images within the specified time range.
- Resolution (m): Set the resolution range for images. The system automatically reads the resolution from image files and loads only images within the specified resolution range.
- Cloud Coverage (%): Set the cloud coverage range for images. The system automatically reads the cloud coverage information from image files and loads only images within the specified cloud coverage range.
- Image Extent: Provides three methods to set the extent, loading only images within the specified range:
- Trim Overlapping Images: After selecting images based on filter criteria, overlapping images may still exist and need further elimination:
- Eliminate Duplicate Names: Remove images with duplicate file names.
- First Priority: Set the first priority for trimming overlapping images. Options include Time, Resolution, or Same Orbit.
- Second Priority: Set the second priority for trimming overlapping images. Choose from the remaining two options. For example, if Time is selected as the first priority, only Resolution or Same Orbit can be selected here.
- Third Priority: Set the third priority for trimming overlapping images, with only one option remaining. For example, if Time is selected as the first priority and Resolution as the second, only Same Orbit can be selected here.
For example: Check Eliminate Duplicate Names, set First Priority to Time, Second Priority to Resolution, and Third Priority to Same Orbit. During image filtering, duplicate images will be removed first, followed by retaining the most recent images by time, then the highest resolution images, and finally images from the same orbit.
- Click the Query button to list panchromatic and multispectral images that meet the filter rules in the Search Result group, and display the image bounds information in the Image Preview window. You can use the Visible button in front of panchromatic or multispectral images to control whether to display the image in the preview window.
- Check whether the filtering results meet the requirements in the Filter Image window. For images that do not meet the requirements or need replacement, use the tools in the Search Result group to add or delete images. When deleting an image, only the panchromatic or multispectral image needs to be deleted; its paired image will be automatically removed.
- After confirming the filtering is complete, click the Export button on the toolbar to output the image file list and save the filtering results. In the original image and reference image settings of Set Image Path and Set Image Path (DSM/DEM), the filtering results can be applied to process production via the Add List method.
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