{'fraction_non_alphanumeric': 0.024199288256227757, 'fraction_numerical': 0.011387900355871887, 'mean_word_length': 5.113043478260869, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Monitoring of environmental changes caused by hard-coal mining

Mining activities lead to ground movements at the surface, resulting in changes of the topographic and hydrologic situation. As surface feature changes can lead to long-lasting environmental influences, an up-to-date surveillance is of key importance. Spatial and temporal changes of the hydrological situation result from the amount of subsidence, local ground-water situation, land-cover and land-use. An important factor is the intensity of impairment regulated by properties of the local soil and vegetation data. To estimate changes of the dynamic system subsidence-ground-water-vegetation, the ground-water recharge rate and isobars of the ground-water table are calculated in detail. This was done repeatedly, starting 1993 and for 2004 as a prediction. Because of the large extent of the area which has to be monitored, airborne surveys were done in August 1998 and 2000, using the HyMap imaging spectrometer. Interim monitoring results of terrestrial areas and measured LAI data were used as reference. With use of spectral unmixing routines, specific information on selected land-use classes were obtained and areas affected by water logging could be detected. Results show that spectral features of the observed land-use and land-cover can be related to specific vegetation phenomena caused by changes of the hydrologic situation.