Assessment of the condition of underground engineering structures of the reclamation system using humidity maps obtained from remote sensing data of the earth by the DJI PHANTOM 4 MULTISPECTRA

Reclamation  system  is  a  complex  of  engineering  structures  and  devices  that ensure the creation of the required water, air, thermal and nutrient regimes of soils. The composition of  reclamation  systems  includes  underground  pipelines,  drains,  hydraulic  structures  that  may fail  and  require  repair,  but  it  is  impossible  to  detect  a  problem  area  without  monitoring  the  area of the system by antediluvian methods or conducting survey work. The purpose of the work: to justify the use of soil moisture maps obtained by the DJI PHANTOM 4 MULTISPECTRA UAV to identify problem areas of the reclamation network or vice versa absence. Aerial photography was carried out in May 2021 on the treated section of the drainage and humidification network of the Yakhrom floodplain of the Moscow region. As a result of the survey, a digital relief model, an operational humidity map based on the calculated NDWI water index were obtained. The flight altitude of the quadcopter was 180 m above the earth’s surface, the pixel size of the image of the earth’s surface to be 7.9 cm. According to the results of aerial photography on the selected site, the absolute marks of the earth’s surface vary from 134.67 to 135.23. On average, the slope of the earth’s surface of the selected site is 0.002 in the direction from  northwest  to  southeast.  There  are  no  pronounced  microforms  of  relief  moisture  in  the  surface layer of the soil obtained in the field corresponds to the variety of color areas of the NDWI water indices highlighted on the operational humidity map. In the soil conditions of the studied area, the moisture content  of  the  surface  soil  layer  is  logarithmic  with  the  normalized  difference  water  index  NDWI. The correlation coefficient is 0.9 ± 0.06, which indicates a very high relationship between the studied indicators. Such a map can be used to identify problem areas of the reclamation network.

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