![]() To turn off shading, toggle the shading icon in the toolbar off. Copernicus Sentinel-2 imagery, processed by Sentinel Hub. The animation over the New Zealand Mountains, showing the behaviour of the ambient, diffuse and specular shading factors. You can change these parameters to make the scene brighter/darker and more appealing, or to make certain details more visible. If specular power is set to 1, the surface will behave as a diffuse surface. If we set the specular power low, the surface will scatter light in different directions, much like if the mirror was dirty or rough. If we set specular power high, the surface will act as a smooth mirror. If the mirror is completely smooth, it will reflect light sharply in one direction. To understand what this means, imagine a mirror. The lower the specular power, the wider the light will scatter, based on the angle of the light. The specular factor simply controls the amount of the parameter, while specular power controls the properties of the parameter. The specularity options influence how the light is dispersed from the surface. When the light reaches the surface perpendicularly, the lighting is strongest, and when the light comes from below, the scene looks completely black. The diffuse factor impacts the amount of illumination, based on the angle and distance of the light reaching the surface. The first slider controls the ambient factor, which affects how much light reaches the scene regardless of the position or angle of the light (in this case, Sun). The reason the Terrain Viewer doesn’t show all the shadows right away is because shadow calculation is computationally expensive.Ĭomparison of ambient, diffuse and specular lighting types. The higher the value, the larger the square - you can see this in the animation below, where the shadows extend further into the distance as we increase the value, and disappear towards us as we decrease it. These are calculated within a square centered on the current camera position. The shadow rendering distance option changes the size of the area in which shadows are calculated. The first option is shadow visibility -this is essentially the transparency of shadows, ranging from completely transparent (not visible) to fully opaque (black shadows). Click on the Parameters in the Settings, to bring them up. To enable these, the Sun option must also be enabled. There are additional options that allow you to manipulate the Sun projected shadows in the settings. The time defaults to your current time, which you can restore by clicking the Current time button. The time is set to UTC, because UTC is globally accepted and is not ambiguous. This can be useful for a number of reasons - for example, you can check when the Sun rises at a particular point on the globe in winter, and how the position of the Sun affects the shadows. You can change the lighting of the scene based on the position of the Sun at any day of the year at any time of the day. By changing these parameters, you can emphasize certain features, or achieve a certain look to suit your needs, but terrain might appear less realistic, similar to the vertical terrain scaling. The default values, which you can restore at any time by clicking the Reset Values buttons, are set to represent realistic proportions and representative shading of the terrain. This feature allows you to manipulate the shading and shadows of your scene with several parameters. Terrain anomalies of the lake Ptuj, Slovenia. Use this feature wisely to avoid mis-representation of data. Changing this value is useful in flatter areas, where differences in elevation are not as easily perceived, and can be better emphasized by increasing the slider above 100 %. The default value, the natural elevation, is set to 100 %. It is possible to change the intensity of terrain elevation differences by moving the Vertical Terrain Scaling slider in the Settings dialogue. We will look at all of these options in detail. The light bulb icon activates shading, the Sun icon activates Sun shadows and tools, and the gear icon opens the Settings panel with various shadow, shading and terrain options. This is particularly useful if you want to quickly return the camera into a default position or if you have zoomed out too much and lost your visualized image. By clicking on the first button (which looks like a target) in the top navigation bar your camera will be positioned over the visualized area top down at a set height of about 40 km above sea level (which is roughly equivalent to a zoom level 13 in EO Browser).
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