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Preliminary results (examples)

 

 

Test Site 1. - Sokolov - Hyperspectral airborne data

The hyperspectral airborne datasets for the Sokolov test site have been collected in 2009 and 2010. The following table shows the sensor parameters and the dates of the over flights. The collected data is shown as a mosaic in following figure. The flight direction was nearly east – west or west – east in the 2009 campaign with the result of illumination and shadow effects, e.g. at forest edges. To compensate for this effects a flight direction from north to south would be the best, but due to the geographical setting of Sokolov test site, there would be too many stripes needed. That's the reason why in 2010 the flight direction was changed to southwest to northeast. The collected data was pre-processed by DLR using the ATCOR 4 software (RICHTER 1996) for atmospheric and topographic corrections. ATCOR 4 considers atmosphere, solar illumination, sensor viewing geometry and terrain information to correct the data (RICHTER 2011).

The processing of the images is based on two main steps. The first one does a parametric geocoding of the data, which ends in a geocoded image and a view geometry parameter file. The second step is the final atmospheric and topographic correction (RICHTER & SCHLÄPFER 2002). For this thesis the data was made available completely pre-processed by DLR. During this procedure each flight stripe went through the processing chain separately, that's why the mosaics in the figure have a slightly different illumination to each other. The shown mosaics are made for presentation issues only.

Parameters of HyMap during Sokolov campaign

HyMap data Sokolov

2009

2010

Acquisition date

27.07.

21.08.

Altitude

2570 m

2480 m

ground speed

≈ 140 km/h

≈ 140 km/h

Ground sample distance

4 m x 4 m

4 m x 4 m

projection

UTM Z 33

UTM Z 33

Data

WGS 84

WGS 84

Number of stripes

9

7

 

Click on image to see it full-sized.

HyMap flight stripes over Sokolov test site
HyMap flight stripes over Sokolov test site.

To have an area which is manageable in the timeframe of this thesis, a spatial subset which includes the active mining area as well as the PVS dump site is created. Another benefit of the creation of a subset is the reducing of data size that to 10 % of the full area. This specific subset has been chosen, because the AMD related minerals and the allocated overburden with the small spots of drainage are likely concentrated in that area, which is shown in the figure.