![]() This method is useful when you want to have multiple levels of detail in your KML. Just make sure that the maximum value is always larger than the minimum. When you specify both a minimum and maximum LOD value for your region, the feature appears when the size is at the and disappears when it reaches the. Q: What happens if I specify both a and ? This method is handy for features like low-resolution maps or historic satellite images that you want to appear on the Earth from far away but disappear when you get close to the ground, where it would obscure the high-resolution satellite imagery. Then, when the screen area of the region reaches the specified pixel value, that feature or folder disappears. Q: Can I make a feature disappear as I get closer to it? Values that work best for minLodPixels are powers of two: 64, 128, 256, 512, 1024, 2048, etc. Q: What are good values for min/maxLodPixels pixels?Ī value of 128 pixels is ideal due to the way Google Earth handles the zooming of image tiles and other features, but 128 isn't always practical depending on your needs. Make screen overlays appear when users are close to features that need explanation or a legend.Use a region with your models to make them disappear when the user is far away. 3D models are often taxing on your computer, even when they are too far away to see them.To show a hierarchy of features, such as KML country borders that fade away as state borders fade in.If you want to show image overlays in increasing levels of detail as you zoom in without taxing the user's computer (See “Super Overlays” below.).When you have lots of placemarks that are dense and clutter the screen.Regions have lots of uses, many of which are beyond the scope of this tutorial. If you specify a minimum level of detail for these placemarks at 256 pixels, they will be invisible until the size of the region, which we'll create from your adjusted image overlay, is at least this size on your screen. Zoom out until the image overlay is about the same size as the 256 x 256 yellow box. When selecting a size, remember that the region will appear at approximately this distance from the Earth. Keep in mind that the Region Size Guide is an approximation although the box sizes are labeled, the calculation of a region's on-screen size is complex and depends on many variables, including the curvature of the Earth and camera tilt. This guide helps you determine which level of detail is best for your placemarks. Increase or decrease the size of the image overlay to match one of the yellow boxes. Press R to ensure that your view is facing north and that you are looking straight down onto the Earth (no tilt). This is a screen overlay that acts as a guide no matter where you move on the Earth. Yellow boxes of different sizes appear on the screen. If you used the Bounding Box Guides placemarks, check the box next to its name in the Places panel to turn them off.Ĭheck the box next to Region Size Guide in the Places panel to turn it on. When you finish adjusting the image overlay, click OK in the Edit Image Overlay dialog. Your regions don't have to be square, but in this tutorial the image overlay is square.Ĭlick and drag the cross in the center of the image overlay to a position where all of the hospital icons are covered by the overlay. ![]() ![]() Note: Holding down Shift key maintains the image's aspect ratio and keeps the overlay square. Hold down the Shift key, and click and drag the corners of the image overlay to make it a little smaller. Right-click Image Overlay in the Places panel, and select Properties from the context menu. Four yellow arrows will appear which indicate the suggested north, south, east and west edges for your image overlay. ![]() If you would like some guidance in sizing and moving your image overlay, you can use the Bounding Box Guides placemark underneath the Image Overlay- turn it on by clicking the box next to its name in the Places Panel. So the first step is to fine tune the image overlay's placement and size.ĭouble-click Image Overlay in the Image Overlay Example document to zoom back in. The overlay is a little over-sized and off-center for our hospitals. ![]()
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