Raster Query

Feature Description

Query raster values or pixel values at the cursor position.

When querying raster data, search results include: data source, dataset, X coordinate, Y coordinate, raster row, raster column, raster value, slope value, and aspect value where the raster value is located.
When querying image data, search results include: data source, dataset, X coordinate, Y coordinate, image row, image column, band value, and color value where the pixel value is located.

Feature Entry

Imagery Tab->Map Operation Group->Raster Query.

Steps

Raster query includes raster query and raster query settings. Taking raster data query as an example, the detailed steps are as follows:

Raster Query
1. Click the Imagery Tab->Map Operation Group->Raster Query button. Move the cursor over the map, and real-time data information will be displayed at the cursor tip, including data source, dataset, GCS, raster row/column numbers, and raster values.
2. Click the desired raster value location. A point will be added on the map (e.g., 1,2,3 in the figure), and raster value information for this point will be displayed in the output window.
3. Right-click to end the query operation without clearing query points on the map. Pressing ESC will end the query operation and simultaneously clear all query points on the map.
Raster Query Settings
Click the drop-down button of Raster Query and select Raster Query Settings to configure whether to display raster information, slope, aspect, etc. Available when raster data exists in the map.
- Display Raster Information: When checked, search results will show raster row, column, and value information for the cursor cell. Uncheck to hide these details.
- Display Slope and Aspect: When checked, search results will show slope and aspect values for the cursor cell. Uncheck to hide these details.
- Elevation Scale Factor: Required when elevation units (Z-axis) differ from X/Y coordinate units. The elevation value should be multiplied by this factor to ensure unit consistency. Example: If X/Y units are meters and Z units are feet (1 foot=0.3048 meters), set scale factor to 0.3048. Setting to 1 means no scaling.
  Recommended practice: Convert map and data to projected coordinate system (units: meters) before raster query. For geographic coordinate systems, specify an appropriate elevation scale factor. When X/Y units are degrees and Z units are meters, use the following Z-factors:
```
   Latitude     Z-factor
       0         0.00000898
      10         0.00000912
      20         0.00000956
      30         0.00001036
      40         0.00001171
      50         0.00001395
      60         0.00001792
      70         0.00002619
      80         0.00005156
      
```

Feature Description

Feature Entry

Steps

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