Application Of GF Series Satelites On Geological Hazard Monitoring In Coal Mining Area

China is a coal mining power.For a long time,human’s various unreasonable mining activities induce a large amount of mine geological disaster,mainly represented as ground subsidence,surface collapse,ground fissure and so on in plain area.In recent years,remote sensing technique developed rapidly and has become an important means for mine geological disaster monitoring.But,the application of domestic satellite data using in mine geological disaster monitoring is not much.GF-1 and GF-2 satellite fill the gaps in the field of high resolution satellite which could provide sufficient data source for the application of domestic satellite in the mine geological envirionment disaster monitoring.In this paper,domestic high resolution satellite imagery,GF-1 and GF-2 in Guqiao Gubei and Xieqiao mining area which is part of Huainan mining area are used as data source.on the basis of deeply analyzing the data feature of GF series satellite data,the preprocessing methods of high resolution satellite data are studied and evaluated.Based on the above researches,the geological hazard information of the research area is extracted respectively by visual interpretation and object orented automatic axtraction technology,finally,the extraction accuracy is evaluated and compared.the research results are as follows:(1)From two aspects of the basic statistics and correlation,image radiometric performance evaluation of GF series satellite data is made.Through the statistics of brightness,standard deviation,skewness,steepness,histogram,average gradient,entropy,SNR and correlation,we find that GF-1 is better than SPOT5,and GF-2 image is slightly worse than the same level image IKONOS.(2)in this paper,the image is preprocessed from the following 4 aspects:orthophoto correction,color band synthesis,image registration and image fusion,furthermore,orthophoto correction and image fusion are studied in depth.the research shows that the accuracy of GF-1 and GF-2 after orthophoto correction can be used to update the 1:10000 topographic map,in which the GF-2 positioning accuracy is higher,and can be usesd for a larger scale topographic map’s updating.the best color synthesis schemes of GF-1 and GF-2 are both RGB:431.the best fusion method to preserve the spatial and spectral feature of GF-1 and GF-2 is HPF。(3)Combining with the characteristics of research aera,through field reconnaissance,remote sensing interpreted signals of water subsidence basin,surface collapse,ground fissures are set up.Then,respectively extracte the geological hazard information of the mining area by visual interpretation and object orented automatic axtraction technology,establish a set of extracting rules for reference,compare and analyze the accuracy.using visual interpretation results as reference,the extraction accuracy by object orented automatic axtraction technology is analyzed.the research finds that the extraction accuracy of water subsidence basin is higher than 85%;the location and length extraction accuracy of ground fissure is higher than 75%;the location extraction accuracy of collapse pits is higher tham 90%.