<title>Atmospheric correction of 2000 HyMAP data in the framework of the EU-project MINEO</title>

Abstract

During the MINEO flight-campaign in summer 2000 HyMap data was recorded for the test site "Kirchheller Heide" north of the Ruhr district. The aim of this project is to use hyperspectral spectrometer data to detect environmental and ecological changes. They are caused by an affected hydrological balance due to deep hard coal mining. Dynamic mining demands regular updates of the spatial information. This data will become part of an environmental monitoring system which shall comprise analysis of hyperspectral data as an important constituent. As an essential preprocessing step for vegetation studies and multitemporal analyses, ATCOR-4 was used for atmospheric correction. Additionally, atmospheric data from "Deutscher Wetterdienst (DWD)" and ground reflectance spectra were recorded as an essential data-input for the ATCOR 4 model. The field spectra were used first to control the accuracy of the standard calibration files which are provided with the hyperspectral data. This workflow provides accurate results for wavelengths shorter than 1 µm directly. In an interactive manner the inflight calibration module of ATCOR-4 allows to built up and adapt new calibration files suitable for all wavelengths. The first calculated atmospheric lookup-tables and this final calibration file were used to perform the atmospheric correction for the HyMap scene.

A Remote Sensing Approach to Subsidence and Vegetation Degradation in a Reclaimed Mine Area&nbsp;

“…This subsidence may have led to collision with non-stowed mining cavities, groundwater intrusion and caused surface flooding which, in turn, affected and caused the decrease in the coverage of dense vegetation and agricultural lands. These results are in line with [1], who showed the relation between surface landscape dynamics and subsurface geological changes. The observed increase in the coverage of bare land may also indicate the vegetation damage caused by the subsidence and surface flooding [3,4].…”

“…This mining method creates cavities in the ground and rock formation, which may result in surface subsidence and changes in the ground water table [20]. Moreover, the area was not properly backfilled when reclaimed [1]. Hence, this area was chosen to study potential occurrence of subsidence and inundation caused by mining activities [2].…”

“…Mining industries also play a vital role in global to regional economies, e.g. in energy production and fuel supply [1].…”

“…In addition, changes in the health of vegetation is an important indicator for assessing the geological changes in an active and reclaimed mine area [13,14]. Health of vegetation may surrogate ecological health as well as growth of water bodies and plant stress [1,8,13]. Remote Sensing (RS) techniques and Geographic Information Systems (GIS) have shown clear advantages over conventional field monitoring and laboratory measurements for assessing long-to short-term landscape dynamics [15][16][17].…”

“…metals, salt and coal, for industrial and domestic usage [1,2]. Countries in the European Union produce about 7% of the industrial and domestic commodities from mine extracted resources [2].…”