Fig. 1. Scheme of ground-based IDOAS instrument

Fig. 2. A set of patlerns observed by ground-based IDOAS observations
(a): DN values at 360 nm; (b): Weight matrix; (c): NO₂ columns; (d): SO₂ columns; (e): Vertical gradient of NO₂ columns; (f): Vertical gradient of SO₂ columns; (g): Horizontal gradient of NO₂ columns; (h): Horizontal gradient of SO₂ columns

Fig. 3. Different simulated stripes and de-striping results
(a): Periodic position, sparse; (b): Periodic position, dense; (c): Periodic position+random position, partial;(d): Periodic position+random position, multi-line; (b), (d), (f), (h) are de-striping results of (a), (c), (e), (g)

Fig. 4. Two groups of NO₂ and SO₂ observing and de-striping results in the Leshan experiment
(a): NO₂columns, started at 12:59; (c): SO₂ columns, started at 12:59; (e): NO₂ columns, started at 13:14;(g): SO₂ columns, started at 13:14; (b), (d), (f), (h) are de-striping results of (a), (c), (e), (g)

Fig. 5. Weighted mean cross-track profiles of NO₂ and SO₂ results before and after de-striping
(a): NO₂, started at 12:59; (b): SO₂, started at 12:59; (c): NO₂, started at 13:14; (d): SO₂, started at 13:14