Sampling Method and Accuracy of Pixel-Scale Surface Reflectance at Dunhuang Site

Han Sun; Jun Pan; Hailiang Gao; Peng Jiang; Xinge Dou; Kaisi Wang; Lin Chen; Li Liu; Qijin Han

doi:10.3788/LOP202259.1028009

Journals >Laser & Optoelectronics Progress >Volume 59 >Issue 10 >Page 1028009 > Article

Laser & Optoelectronics Progress
Vol. 59, Issue 10, 1028009 (2022)

Sampling Method and Accuracy of Pixel-Scale Surface Reflectance at Dunhuang Site

Han Sun¹, Jun Pan¹, Hailiang Gao^2、*, Peng Jiang¹, Xinge Dou¹, Kaisi Wang¹, Lin Chen³, Li Liu⁴, and Qijin Han⁴

Author Affiliations

¹College of Geoexploration Science and Technology, Jilin University, Changchun 130012, Jilin , China

²Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

³National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, China

⁴China Center for Resources Satellite Data and Application, Beijing 100094, China

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DOI: 10.3788/LOP202259.1028009 Cite this Article Set citation alerts

Han Sun, Jun Pan, Hailiang Gao, Peng Jiang, Xinge Dou, Kaisi Wang, Lin Chen, Li Liu, Qijin Han. Sampling Method and Accuracy of Pixel-Scale Surface Reflectance at Dunhuang Site[J]. Laser & Optoelectronics Progress, 2022, 59(10): 1028009 Copy Citation Text

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Fig. 1. Schematic diagram of site location

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Fig. 2. Sampling distribution of spectrometer system in 2 m basic sampling unit

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Fig. 3. Sampling distribution of basic sampling unit system in pixel scale

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Fig. 4. Schematic diagram of ground measurement accuracy analysis

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Fig. 5. Schematic of ground spectrum measurement

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Fig. 6. UAV data simulation ground measurement point scale

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Fig. 7. Schematic diagram of UAV data clipping

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Fig. 8. Sampling average relative error from ground point scale to 2 m surface scale. (a) R band; (b) G band; (c) B band; (d) RGB bands

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Fig. 9. Sampling relative error from 2 m to 150 m scale. (a) 150 m new site; (b) 150 m national site

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Fig. 10. Sampling relative error from 2 m to 3 km scale. (a) 3 km new site; (b) 3 km national site

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Fig. 11. Sampling scheme from 2 m to 3 km. (a) Distribution of 5-point simulated annealing sampling points; (b) distribution of 16-point simulated annealing sampling points; (c) distribution of 25-point simulated annealing sampling points

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Site corner		Northwest corner	Southwest corner	Southeast corner	Northeast corner
150 m national site	Longitude	94.39355	94.39355	94.39485	94.39485
150 m national site	Latitude	40.0936	40.09198	40.0936	40.09198
150 m new site	Longitude	94.36781	94.36745	94.36919	94.36955
150 m new site	Latitude	40.08849	40.08718	40.08692	40.08821
3 km national site	Longitude	94.30625	94.30625	94.33271	94.33271
3 km national site	Latitude	40.15317	40.12079	40.15317	40.12079
3 km new site	Longitude	94.35431	94.34690	94.38210	94.38953
3 km new site	Latitude	40.11939	40.09293	40.08729	40.11376

Table 1. Site longitude and latitude coordinate information

Site		From 2013 to 2015	From 2016 to 2019	Total number of images
150 m	National site	4	15	19
150 m	New site	7	15	22
3 km	National site	11	9	20
3 km	New site	5	13	18

Table 2. Data list of GF-1 in four sites

Sample number	1	2	3	4	5
Longitude	94.3942	94.3942	94.39376	94.39464	94.3942
Latitude	40.09333	40.09225	40.09279	40.09279	40.09279

Table 3. Longitude and latitude coordinates of sampling points in 5-point system of 150 m national site

Sample number	1	2	3	4	5	6	7	8
Longitude	94.39371	94.39404	94.39436	94.39469	94.39371	94.39404	94.39436	94.3947
Latitude	40.0934	40.0934	40.0934	40.0934	40.09299	40.09299	40.09299	40.09299
Sample number	9	10	11	12	13	14	15	16
Longitude	94.39371	94.39404	94.39436	94.3947	94.39371	94.39404	94.39436	94.3947
Latitude	40.09259	40.09259	40.09259	40.09259	40.09219	40.09219	40.09219	40.09219

Table 4. Longitude and latitude coordinates of sampling points in 16-point system of 150 m national site

Sample number	1	2	3	4	5
Longitude	94.35794	94.38047	94.38589	94.35839	94.36292
Latitude	40.11092	40.09074	40.10985	40.10998	40.10344

Table 5. Longitude and latitude coordinates of 5 simulated annealing sampling points in 3 km new site

Sample number	1	2	3	4	5	6	7	8
Longitude	94.37661	94.38198	94.3633	94.37024	94.36929	94.36194	94.38296	94.37824
Latitude	40.10553	40.09679	40.11004	40.09793	40.10714	40.10528	40.1134	40.10137
Sample number	9	10	11	12	13	14	15	16
Longitude	94.35699	94.37405	94.35687	94.37615	94.36508	94.37066	94.38875	94.35792
Latitude	40.11773	40.09708	40.09814	40.09909	40.0952	40.09207	40.11327	40.10937

Table 6. Longitude and latitude coordinates of 16 simulated annealing sampling points in 3 km new site

Sample number	1	2	3	4	5
Longitude	94.38061	94.37741	94.35877	94.35501	94.37336
Latitude	40.11184	40.10114	40.10091	40.10985	40.10837
Sample number	6	7	8	9	10
Longitude	94.37999	94.38068	94.35145	94.38157	94.36702
Latitude	40.10211	40.09279	40.10821	40.09507	40.10055
Sample number	11	12	13	14	15
Longitude	94.36422	94.36182	94.3538	94.35416	94.36628
Latitude	40.11244	40.0959	40.09527	40.09735	40.11672
Sample number	16	17	18	19	20
Longitude	94.37871	94.35798	94.3797	94.37064	94.36068
Latitude	40.11257	40.10956	40.09297	40.09979	40.11481
Sample number	21	22	23	24	25
Longitude	94.37714	94.37607	94.37491	94.37724	94.35638
Latitude	40.10784	40.11427	40.08861	40.10723	40.11746

Table 7. Longitude and latitude coordinates of 25 simulated annealing sampling points in 3 km new site

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