Set Image Path (DSM/DEM)

Instructions for use

Set Image Path (DSM/DEM) is used to configure the original image path, processing result data path, output coordinate system, output format, and other information for the DSM/DEM data production process.

Supported starting from SuperMap iDesktopX11i(2023) version.

Parameter description

Parameter Name Parameter Interpretation Parameter Type
Processing Path Set a local path to store all intermediate and result data generated during data processing. File
Output Coordinate System

Set the coordinate system for the imagery; intermediate and result data will be output in this coordinate system.

Will automatically apply to all processes and result data in the workflow production.

Note:

Only useful when executing the complete workflow. If only a specific tool in the workflow is executed, the output result data may not necessarily use the coordinate system set here.

 PrjCoordSys
Output Format

Set the storage type for the result image. Four options are provided: Not Set, Tiff/GeoTIFF, Erdas Image, and PCIDSK. Default is Tiff/GeoTIFF, meaning the original storage type of the image will be used for output.

Will automatically apply to all processes and result data in the workflow production.
FileType
Compression Method

Available only when Output Format is Tiff/GeoTIFF. Default is NONE. For more method descriptions, refer to Compression method.

Will automatically apply to all processes and result data in the workflow production.

 CompressMethod
Plane Accuracy

Plane accuracy determines whether to perform rough correction on the original image. Default is High, meaning no rough correction is applied to the image. Selecting Medium or Low will apply rough correction to the original image.

  • Low: Generally indicates an image planar accuracy error greater than 40 pixels.
  • High: Generally indicates an image planar accuracy error less than 15 pixels.
  • Medium: Select this when the image accuracy cannot be determined; the program will automatically estimate the accuracy.
 ImageAccuracy
Forward-Looking Image Set the path information for the forward-looking image. Four input methods are provided: Add File, Add Folder, Add List, and Add Mosaic Data. When selecting Add Folder, all image files in the folder (including subfolders) will be automatically retrieved. File
Rear-View Image Set the path information for the rear-view image. Four input methods are provided: Add File, Add Folder, Add List, and Add Mosaic Data. When selecting Add Folder, all image files in the folder (including subfolders) will be automatically retrieved. File
Satellite Sensor Type Set the satellite sensor type for the original image. Different types of satellite sensors have different spectral response functions and bit depths. Setting the correct sensor ensures the original image is opened correctly and accurate metadata is obtained. Supports processing GF-7, ZY3, ZY3-01, ZY3-02, and ZY3-03 remote sensing satellite data.
SensorCategory
Image Filtering Criteria Not checked by default, meaning all forward-looking and rear-view images are loaded. If this checkbox is checked, it means images are loaded only when the image name in the folder contains the filter string. Filter string settings are as follows:
  • If no filter string is set, all images in the folder will be loaded.
  • If only the forward-looking or rear-view image filter string is set, only the corresponding image type will be filtered.
  • If both forward-looking and rear-view image filter strings are set, forward-looking and rear-view images meeting the filter criteria will be loaded separately.
 Boolean
Backward Filtering String Available after checking Image Filtering Criteria. Set the string for filtering rear-view images; only images whose file names contain this string will be loaded. String
Foresight Filter String Available after checking Image Filtering Criteria. Set the string for filtering forward-looking images; only images whose file names contain this string will be loaded. String
Create Image Pyramid Checked by default. Builds pyramids for the original image based on the specified resampling method, improving image zoom display rendering and performance. Boolean
Resampling Method Available after checking Create Image Pyramid. Default is Average. For more method descriptions, refer to Resampling Method. ResamplingMethod
Reference Image

Reference data serves as a baseline with accurate geographical location. During the imagery process, control points are generated based on the reference data to perform geometric correction on the image.

Four input methods are provided: Add File, Add Folder, Add List, and Add Mosaic Data. When selecting Add Folder, all image files in the folder (including subfolders) will be automatically retrieved.

 String
Load According to the Original Image Range Checked by default, meaning only reference images within the original image range are loaded to reduce the amount of data loaded into the workflow and speed up processing. Boolean
Create Reference Image Statistics During image browsing, the layer will be stretched based on statistical information. If the image lacks statistical information, it will be displayed using the default stretch method, and 8-bit data will not be stretch displayed. Not checked by default, meaning no statistics are created for the reference image. Boolean
Create Image Pyramid Checked by default. Builds pyramids for the reference image data based on the specified resampling method, improving image zoom display rendering and performance. Boolean
Resampling Method Available after checking Create Image Pyramid. Default is NONE. For more method descriptions, refer to Resampling Method.

ResamplingMethod
Cloud Amount Data Not checked by default, meaning no cloud amount data is input. If checked and cloud amount data is input, the original image can be filtered based on this data. Boolean
Data Source

Available after checking Cloud Amount Data.

Specify the data source where the cloud cover dataset is located.

 DataSource
Dataset

Available after checking Cloud Amount Data.

Specify the cloud cover dataset.

 DatasetVector
Time After checking the checkbox, specify a time range; only images within this range will be loaded. Boolean
Resolution After checking the checkbox, specify a resolution range; only images within this range will be loaded. Unit is m. Boolean
Cloud Cover After checking the checkbox, specify a cloud cover percentage; only images with cloud cover less than or equal to this value will be loaded. Boolean
Remove Duplicate Images After checking the checkbox, duplicate image data will be removed based on the image file name. Boolean
Elevation Data Type

Select the data source for elevation data. Three options are provided:

  • SRTM V4: Selected by default, meaning elevation data comes from the fourth version of global 90-meter SRTM data in the remote sensing resource environment.
  • Fixed Elevation Value: Input a custom elevation value.
  • User Elevation Dataset: Load elevation information by specifying DEM Data. Supports four formats: Tiff/GeoTIFF, Erdas Image, PCIDSK, and ArcInfoGrid. Among these, ArcInfoGrid format data can only be retrieved by clicking the Add Folder button.
 ElevationDataType
Use Geoid When elevation data refers to orthometric height above sea level, use geoid to convert it to ellipsoidal height. Not required if elevation data is already ellipsoidal height. Boolean
Geoid File Available after checking Use Geoid. Specify the geoid file from local files. File

Output Result

Adds original images and reference images to the workflow and completes global parameters such as the coordinate system and result path for data processing.

Related Topics

Generate Tie Points

Generate Ground Control Points

Block Adjustment