Now we have to resize our Image to 1025x1025, so resize the Image so that the shorter side is 1025 pixels long. If you want to use custom region sizes you’ll have to create or edit a config.bmp file. A standard region can be imported from a 1025x1025 greyscale Image. And crop out the elevation key on the bottom. Now convert your TIFF in to a Greyscale Image. Note that there are still blue sections in this Image. If you have any blue sections of terrain (Ocean) use the magic wand tool to select them and fill them black. For this tutorial I’ll be using Photoshop. Step 6- You need to edit this Image with a photo-Image editor. Now you’ll need to save your modified DEM as a GEOTIFF: Gray scale is corrected for our purposes. I have reset this Image from -1 meter to -800 meters and the upper range from roughly 3400 meters to 2000 meters. The numbers you are inputting are in meters, and the first number is for the low elevation, or what height you wish to assign to black. You will now be able to tell MICRODEM where to start and end the shading of the elevation. Right click on the Image and select ’Elevation colors’ then ’Specify’ from the following menu. You’ll notice that the ocean check has left a section of this DEM (Puget Sound near Olympia, WA) blue, but that the shades of grey are a little too dark in the areas near the water that should be land. You need to select ’Grey scale.’ If your DEM is on a coast line the check box ’Ocean Check’ will make all of the ocean water blue, while your terrain will turn different shades of grey. Your dem is now color coded by elevation, but you need to get it in black and white, so right click on the Image again and select ’Elevation Colors’ then ’Colors’ from the next menu.
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