1. Set Sand table
First put the sandbox box securely, it is best to make the location of the sand table consistent with the field, and then spread 3-5 centimeters thick, humidity appropriate sand, and the plank scraping flat pressure, as the lowest contour of the plane, and then hit and topographic map of the corresponding square, in the sand box around note the corresponding number.
2. The accumulation of landforms
(1) According to the grid will be selected on the topographic map of the lowest contour, can control the basic shape of the contours of the topography, as well as the peak, the saddle, the foot of the slope, tilt the transformation point and the location of the river to draw on the sand table surface. (2) will calculate a good peak, saddle, foot, tilt transformation Point and river bends, such as sharp fluctuations and points, respectively inserted into the bamboo sticks. The height of the bamboo stick is the height of the sand table plus the thickness of the bottom sandy soil. (3) in the lowest waiting for the High Line range, to the bamboo and other high line as the basis, first heap out the peak, saddle, mountain back, such as the rough shape as the backbone, And then trimming the other parts. If the sand table is large, it can be stacked up and out of the difficulty, and then accumulate in and out of convenient place. When stacked, you should control the topographic map at any time, in order to correctly show the undulating state of the landform, and should be at any time to tighten the sand, so as not to collapse deformation. If there are larger rivers and lakes, they should be dug together when the landforms are trimmed. After the accumulation, should be fully inspected and trimmed, and from high to low layers of the ground A color-matched sawdust (or sprayed with color).
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