{'fraction_non_alphanumeric': 0.022810890360559236, 'fraction_numerical': 0.01177336276674025, 'mean_word_length': 5.210045662100456, '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}}
The Dynamic Monitoring of Coal Mining Seeper Subsidence District Based on RS and GIS Technology — A Case Study of Huainan City

Using the 1987 TM and 2006 ETM+ remote sensing images and other related ancillary geographical data of Huainan city, combined with GIS Technology, the dynamic change of the coal mining subsidence of Huainan city was extracted. In order to unify the two period image data difference because of the different date, the research used modified normalized difference water index (MNDWI) to get the information of seeper subsidence in coal mining district. Using the change detection function of RS, Combined with the spatial analysis and statistics function of GIS, all the subsidence area of coal mining district and the seeper subsidence area were extracted. The research shows that the seeper subsidence extent is different because of the mining period, scale, method, groundwater level and groundwater extraction, surface coverage, roof’s management and other coal seam geological environments, especially dip angle of coal seam. The Xiejiaji and Bagongshan mine’s mining seeper subsidence are the serious due to its bigger dip angle of coal seam, the seeper subsidence percentage are 38.57%, 25.95% respectively, while Jiulonggang- Datong mining seeper subsidence is the least even if it’s the oldest and abandoned mine in Huainan.