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<p>and a good <a href="page.php?w=digital_terrain_model">digital terrain model</a> (DTM).</p>

<p>For train and road traffic noise, the description of the sources is usually made in terms of parameters such as speed, number of vehicles etc. Measurements are used for the validation of results.</p>

<p>For <a href="page.php?w=industrial_noise">industrial noise</a> map production, the most important thing is the description of noise sources: <a href="page.php?w=sound_power">sound power</a> levels (emission), directivity, working periods. Although some</p><p>
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