Image Dataset Attribute Panel

The Image Dataset Properties panel contains three modules: dataset, coordinate system, and image information. Below are detailed descriptions of each module:

Dataset

Click Dataset in the Properties panel to view the attributes of the currently selected image dataset. The parameters are described as follows:

  • Basic Information：
    • Name: Displays the name of the image dataset.
    • File Path： Displays the path where the image dataset is located. This parameter is shown when opening image files as a file database.
    • Size： Displays the size of the image files. This parameter is shown when opening image files as a file database.
    • Type： Displays the type of the dataset.
    • Table Name： For database datasources, displays the name of the data table corresponding to this dataset in the database; for file databases, displays the name of the dataset properties table.
    • Encoding： Displays the encode type of the image dataset, which is the compression encode type used during dataset storage. For details on dataset encode types, refer to: List of compression encode types for dataset storage.
  • Dataset Bounds：
    • The top and bottom values represent the boundaries along the Y-axis (i.e., 'Y='); the left and right values represent the boundaries along the X-axis (i.e., 'X='). The unit of these values is the same as that of the dataset. You can directly input values to modify them, and click the Apply button at the bottom right of the properties panel to apply the changes.
      Note:

      If the original image set has no extent, the right and top values in the dataset bounds of the properties panel represent the resolution multiplied by the number of columns and resolution multiplied by the number of rows, respectively.

    • Copy and Paste：Click the Copy button to copy the current dataset bounds. You can also click the Paste button to set the left, bottom, right, and top values of the copied bounds to the current extent.
  • Dataset Description： Displays the description of the image dataset. Users can edit the description of the dataset.

Coordinate System

Click Coordinate System in the Properties panel to switch the display to the coordinate system information of the currently selected image dataset. The parameters are described as follows:

  • Coordinate System： Displays the coordinate system information of the image dataset.
  • Geographic Unit： Displays the distance unit of the image dataset.
  • Coordinate System Information： Displays detailed description information about the projection of the image dataset.

Description of the buttons above the coordinate system information display area:

  • Reset： Click this button to open the Projection Settings dialog and reset the coordinate projection of this dataset. For specific setup methods, refer to the Projection Settings window.
  • Copy： Click this button to open the Copy Coordinate System dialog, where you can copy coordinate system information as the projection for the current dataset. The system provides three ways to copy a coordinate system: copying the coordinate projection of an existing datasource in the current workspace, copying the coordinate projection of an existing dataset in the current workspace, or copying a specified projection info file from local storage. The system supports seven types of projection info files: TIFF File (*.TIF), SIT (*.SIT), Erdas Image File (*.IMG), ArcGIS Shapefile File (*.SHP), MapInfo Exchange Format (*.MIF), MapInfo TAB File (*.TAB), and Projection Info File (*.XML).
  • Export： Exports the dataset projection as a projection info file (*.xml).
  • Import： Imports a *.xml file containing coordinate system information, and uses the coordinate system from the file as the dataset's coordinate system.
  • Convert： Click this button to open the Project dialog and convert the current projection of the selected dataset. For specific setup methods, refer to the operation instructions for the Project dialog in Project.

Image

Click the Image option in the Properties panel to display the image properties information of this image dataset.

Image Information：

  • Number of Bands： Displays the number of bands contained in a multi-band image dataset.
  • X Resolution: Displays the resolution of the image dataset in the X direction.
  • Y Resolution: Displays the resolution of the image dataset in the Y direction.
  • Raster Tiling： Shows the size of the current image dataset's raster tiling. As shown in the figure above, every 256*256 pixels are stored as a raster tile, and during data processing, one raster tile is processed together.
  • NoData Value： Refers to values in image data that have no practical significance, represented as RGB decimal integers. After adding the dataset to the map window, you can reset the NoData value. In the layer properties panel, the expression of NoData is linked to vertex color. For example, if vertex color is RGB and NoData is 96555, it displays as (1,21,43) in the layer properties panel.
Note:

For image files opened as read-only, modifying the NoData value of the image dataset does not take effect in calculating image histograms and statistical data.

  • Number of Rows： Displays the number of rows in the pixel array of the image dataset.
  • Number of Columns： Displays the number of columns in the pixel array of the image dataset.

Image Metadata：

When opening remote sensing original image files with RPC information in *.xml or *.txt format, this group of attributes is provided. If the original image has been opened via *.xml or *.txt format previously, switching to open in *.tif or *.tiff format later still allows access to this group information.

  • Sensor Name：Displays the name of the sensor that acquired the remote sensing image files. E.g., GF-2, SuperView-1.
  • Product Name：Displays the unique identifier ID assigned to this file during acquisition of the remote sensing image files.
  • Acquisition Date：Displays the date when the remote sensing image files were acquired. E.g., 2017-10-21.
  • Cloud Cover (%)：Displays the cloud cover percentage of the remote sensing image files. 0% indicates no clouds, and 100% indicates complete coverage.
  • Solar Azimuth Angle (°)：Displays the angle between the ground projection line connecting the image center point and the sun, and the geographic meridian at that point when acquiring the remote sensing image files.
  • Solar Elevation Angle (°)：Displays the angle between the direction from the image center point to the sun and the horizontal plane when acquiring the remote sensing image files.
  • Sensor Azimuth Angle (°)：Displays the angle between the ground projection line connecting the image center point and the sensor, and the geographic meridian at that point when acquiring the remote sensing image files.
  • Sensor Elevation Angle (°)：Displays the angle between the direction from the image center point to the sensor and the horizontal plane when acquiring the remote sensing image files.

Band Information：

  • Index： Displays the index value of the currently displayed band in a multi-band image dataset, numbered starting from 0.
  • Name: Displays each band of the image dataset.
  • Pixel Format： Displays the bit depth of the image data storage, i.e., how many bits (bit) are used to represent each pixel.
  • Min：Displays the minimum pixel value in the corresponding band.
  • Max：Displays the maximum pixel value in the corresponding band.
  • Radiance Gain：Displays the coefficient for converting the digital number (DN) of image brightness recorded by the sensor to radiance. This attribute group is provided when opening remote sensing original image files with RPC information in *.xml or *.txt format. If the original image has been opened via *.xml or *.txt format previously, switching to open in *.tif or *.tiff format later still allows access to this parameter.
  • Radiance Bias：Displays the offset for converting the digital number (DN) of image brightness recorded by the sensor to radiance. This attribute group is provided when opening remote sensing original image files with RPC information in *.xml or *.txt format. If the original image has been opened via *.xml or *.txt format previously, switching to open in *.tif or *.tiff format later still allows access to this parameter.
  • Solar Irradiance：Displays the solar radiation energy that reaches a unit area on the solid Earth surface per unit time after absorption, scattering, and reflection by the atmosphere. Unit: W/m². This attribute group is provided when opening remote sensing original image files with RPC information in *.xml or *.txt format. If the original image has been opened via *.xml or *.txt format previously, switching to open in *.tif or *.tiff format later still allows access to this parameter.

When data is a single-band image, you can add single-band images to freely combine them into a multi-band image display. For example, in Landsat 8 image data, image files are stored as single bands. Now, combine these bands for display to obtain more intuitive data information.

  1. Add Band：Click the Add button to include the dataset for band combination in the Select dialog.
    • Band 432 combination is a true-color image synthesis, suitable for identifying various land types. The band combination yields the result shown in Figure 2 below.
    • Band 543 combination is a standard false-color synthesis, useful for vegetation classification and water body identification, monitoring vegetation, crops, and wetlands. The band combination yields the result shown in Figure 3 below.
  2. Delete Band：To remove an added single-band data, select the band record in the band list box and click the Delete button.

Statistics Information：

  • If statistics information has been calculated for the image dataset, the pixel information for each band is displayed in the statistics information list.
  • If statistics information has not been calculated for the image dataset, a prompt appears: "Statistics information not calculated for current data." Users can click the Statistics button on the right to perform statistical analysis on the data information.

Others：

  • Pyramids： Indicates whether pyramids have been built for the image dataset.
  • Histogram： Indicates whether a histogram has been created for the raster dataset. If created, you can view it by clicking the Browse button on the right. If not created, you can create it by clicking the Create button on the right.
  • Visible Bounds：： Used to set the visible bounds of the raster dataset in the map. After setting the visible bounds for the selected raster dataset, only the information within the set range is displayed, and the rest is invisible.

    Click the Settings button on the right to open the Set Visible Bounds dialog. You can use a region dataset from the current workspace as the visible bounds for the selected raster dataset. Alternatively, click the button next to filter expression to open the SQL Expression dialog, where you can set a filter expression to control the visible bounds of the raster dataset. For details, refer to Query via SQL Statement.

    Click the Reset button to reset the dataset's visible bounds to display the entire dataset.

Related Topics

Vector Dataset Attribute Panel

Raster Dataset Attribute Panel