Extraction of fractional vegetation cover in arid desert area based on Chinese GF-6 satellite

Deng, Zhengdong; Zhao, Lu; Wang, Guangyuan; Wang, Daqing; Ding, Zhibin; Zhao, Hongfei; Xu, Han; Shi, Yue; Cheng, Zijian; Zhao, Xiaoning

doi:10.1515/geo-2020-0241

Cited by 22 publications

(15 citation statements)

References 30 publications

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“…GF-6 has high resolution, large coverage, high quality and multiband. For instance, the red edge data of GF-6 can be used to extract fractional vegetation coverage [48] and its wide image can realize tree species classification [49]. Moreover, Li et al pointed out that GF-6 data could play an important role in the field of fire monitoring and post-disaster assessment [50].…”

Section: Satellite Datamentioning

confidence: 99%

Study on High-Resolution Suspended Sediment Distribution under the Influence of Coastal Zone Engineering in the Yangtze River Mouth, China

et al. 2022

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In this study, we analyzed the influence of coastal zone engineering on suspended sediment concentration (SSC) in the Yangtze River mouth based on HY-1C and Chinese GaoFen (GF) satellite data. The results show that: (1) SSC in the Yangtze River mouth is mainly in the range of 200–1300 mg/L, which changes due to natural factors as well as coastal zone engineering; (2) The sand blocking engineering effectively protects the channel from siltation, and SSC in the central line of the channel is 100–300 mg/L lower than that near the dikes in the north and south; (3) Qingcaosha Reservoir plays a stabilizing role in the hydrodynamic force, promoting the deposition of suspended matter, so that the water in the reservoir is clear. SSC inside the Qingcaosha Reservoir, located in the center of the estuary, is 100–500 mg/L lower than the high SSC water outside the reservoir; (4) The bridges interact with the current, facilitating the transport of local sediment, resulting in the increase in SSC downstream of these bridges, and obvious vortexes appear with the length up to nearly 2400 m; and (5) Corresponding protection and development suggestions were put forward as follows. A linear array of wind power plants can be built near and parallel to dikes and leading jetties; to increase the depth of the southeast end of the reservoir; and the location of the bridge should be selected in the place of river where siltation is easy. This study aimed to study the SSC distribution under the complex impact of coastal zone engineering with satellite and to provide possible improvement suggestions.

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Section: Satellite Datamentioning

confidence: 99%

Study on High-Resolution Suspended Sediment Distribution under the Influence of Coastal Zone Engineering in the Yangtze River Mouth, China

et al. 2022

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“…The satellite adds the "red edge" band and ultraviolet band to the WFV sensor, and the observation width reaches 800 km. This has played an important role in effectively reflecting the specific spectral characteristics of crops, natural resource investigation and monitoring, disaster prevention and mitigation (Deng et al, 2021;Xia et al, 2022). GF-6/PMS images of L1A from 2019 to 2021 used in this study are from the China Ocean Satellite Data Service (https://osdds.nsoas.org.cn/).…”

Section: Satellite Datamentioning

confidence: 99%

The spatial-temporal consistency of chlorophyll-a and fishery resources in the water of the Zhoushan archipelago revealed by high resolution remote sensing

et al. 2022

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Details of the chlorophyll-a (Chl-a) distribution in the water of the Zhoushan archipelago were analyzed based on data from the panchromatic multispectral sensor (PMS) of the GaoFen-6 (GF-6). A new Chl-a inversion model was built using in-situ Chl-a and the green-red bands of the 2 m spatial resolution GF-6/PMS image. Combined with fishery data, the relationship between Chl-a concentration and fish resources were revealed. The results show that: (1) High Chl-a concentration area was mainly concentrated in the nearshore intensive islands waters, and Chl-a concentration changes obviously with the change of tidal currents. Chl-a concentration around islands increases, especially downstream of islands. Seasonally, Chl-a concentration is higher in spring and summer, lower in autumn, and lowest in winter. (2) The change of fish eggs and larvae in the water of the Zhoushan archipelago shows consistency with the spatial distribution and seasonal variation of Chl-a. (3) The interaction between tidal currents and islands results in the diverse currents (upstream upwelling and downstream vortex currents) around the islands, promoting vertical water exchange and the uplifting of nutrients, resulting in a high overall Chl-a concentration in the waters around the islands. The diverse flow conditions, the ideal nutrient-rich environment, and the abundant phytoplankton attract a large number of fish to gather and breed in the waters around the islands. (4) Chl-a of intensive island waters is an essential indicator for fish spawning grounds.

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“…FVC was calculated by pixel bisection model (Li, 2003;Deng et al, 2021). using 5% confidence interval, NDVIs is the NDVI value with 5% cumulative percentage, and NDVIv is the NDVI value with 95% cumulative percentage.…”

Section: Leaf Area Index (Lai) and Fractional Vegetation Coverage (Fvc) Estimation Based On Thermal Imagesmentioning

confidence: 99%

Study on energy and water balance of pepper field in arid areas

Zhang¹,

Wang²,

Ke³

et al. 2022

Preprint

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The middle Heihe River Basin (MHRB) in arid areas in China faces the challenge of sustainability, but frequent over-irrigation deteriorated the situation. The water balance and energy budget have not been widely used for the quantifying evaluation of over-irrigation. Although some studies have measured the energy budget and water balance in cropland, the energy and water balance in pepper fields is still unclear. An experiment was conducted using an eddy covariance system, SmartView fluke and other measurements in MHRB. The leaf area index (LAI) for pepper increased in the first two months, then decreased thereafter. After Aug. 4, the daily evapotranspiration (ET) decreased during the maturation stage. The soil moisture was higher than the field capacity frequently, indicating that over-irrigation had occurred. Soil water content was relatively high at 100 cm depth, causing high percolation. The water inputs were 1.5 times ET, and the deep percolations accounted for 74% of the total irrigation inputs. Irrigation water could be conserved 301 mm, in case that percolation was avoided. Therefore, the irrigation amount (per time and total) should be reduced to achieve high water use efficiency (WUE). The latent heat flux (LE) consumed 80% of the net radiation (Rn). In July, the LE/Rn was the highest among all months, whereas H/Rn was the lowest due to the highest value of LAI in July. The net radiation had a significant positive linear correlation with the latent heat flux because of the high water supply. Our study showed that there was considerable room for water conservation in MHRB. Keywords: Sensible heat flux; Soil water content; Evapotranspiration; Latent heat flux; Leaf area index

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Extraction of fractional vegetation cover in arid desert area based on Chinese GF-6 satellite

Cited by 22 publications

References 30 publications

Study on High-Resolution Suspended Sediment Distribution under the Influence of Coastal Zone Engineering in the Yangtze River Mouth, China

Study on High-Resolution Suspended Sediment Distribution under the Influence of Coastal Zone Engineering in the Yangtze River Mouth, China

The spatial-temporal consistency of chlorophyll-a and fishery resources in the water of the Zhoushan archipelago revealed by high resolution remote sensing

Study on energy and water balance of pepper field in arid areas

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