Instructions for use
The 3D Hillshade Map "function obtains the assumed illuminance of a surface by determining the illuminance for each pixel in the grid surface. The assumed illuminance is derived by setting the position of the assumed light source and calculating the illumination value associated with each pixel. 3D Renderings can greatly increase the stereoscopic Display Effects of grid surfaces for analysis or graphical display, especially when transparency is used. For a detailed introduction to 3D Hillshade Map, please refer to the introduction in 3D Hillshade Map.
Application Example
Open the Terrain "Datasource under the Exercise Data/Raster Analysis folder, and there is DGM data with a resolution of 5 meters, which we will use as an example.
Function entrance
- On the Spatial Analysis tab-> Raster Analysis-> Surface Analysis-> 3D Hillshade Map;
- Toolbox-> Raster Analysis Tools-> Surface Analysis-> Terrain Calculation-> 3D Hillshade Map.
Parameter Description
- Azimuth: Azimuth is expressed in positive degrees between 0 and 360 degrees and is measured clockwise from north.
- Altitude Angle: The altitude angle of the light source above the horizon. Elevation angles are represented by positive degrees, with 0 degrees representing the horizon and 90 degrees representing the positive overhead direction.
- Shadow Model: There are three types of 3D Hillshade Map: render shadow effect, render effect, and shadow effect.
- Rendering and Shadows: The local lighting angle and the effect of shadows are taken into account.
- Shadow: Only consider whether the current area is in the shadow.
- Render: Only the local lighting angle is considered.
- Elevation Scale Multiplier: The unit transformation factor of the grid elevation values (Z values) relative to the X and Y coordinates in the grid surface. The default is 1, which means no scaling. When the units in the Z direction are different from the X, Y units of the grid surface, you can use the elevation scaling factor to adjust.
- If the X, Y units are the same as the Z units, the elevation is scaled by a factor of 1, indicating no scaling.
- If you use different units of measurement for X, Y, and Z units, you must use the appropriate elevation scaling factor or you may get incorrect results. For example, the units in the X and Y directions are meters, and the units in the Z direction are feet. Since 1 foot = 0.3048 meters, you need to specify an elevation scaling factor of 0.3084 to convert feet to meters.
Result Data
- Datasource: All the Datasources in the Current Workspace are listed. Select the Datasource where the Result Dataset is located. Default is the same as Source Datasource.
- Dataset: Sets the name of the Result Dataset. The newly generated vignette Dataset is a Dataset of the same size and resolution as the Source Dataset.
Click the "Execute" button to execute the operation of generating the shading map.
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| Figure: 3D Hillshade Map |
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