PIE-engine 教程 ——Landsat 8 TOA数据常见的4中去云方式，其中一种比GEE简单只需一行代码

编程语言 2022-09-26 21:12:39 阅读次数: 0

本文的主要目的是在PIE中使用代码完成Landsat 8的去云工作，这里我们首先查看一下我们所需要的影像数据：

QA_PIXEL

QA Bitmask

Bitmask for BQA
Bit 0: Designated Fill 0: No 1: Yes Bit 1: Terrain Occlusion 0: No 1: Yes Bits 2-3: Radiometric Saturation 0: No bands contain saturation 1: 1-2 bands contain saturation 2: 3-4 bands contain saturation 3: 5 or more bands contain saturation Bit 4: Cloud 0: No 1: Yes Bits 5-6: Cloud Confidence 0: Not Determined / Condition does not exist. 1: Low, (0-33 percent confidence) 2: Medium, (34-66 percent confidence) 3: High, (67-100 percent confidence) Bit

Bitmask for BQA

Bit 0: Designated Fill
- 0: No
- 1: Yes
Bit 1: Terrain Occlusion
- 0: No
- 1: Yes
Bits 2-3: Radiometric Saturation
- 0: No bands contain saturation
- 1: 1-2 bands contain saturation
- 2: 3-4 bands contain saturation
- 3: 5 or more bands contain saturation
Bit 4: Cloud
- 0: No
- 1: Yes
Bits 5-6: Cloud Confidence
- 0: Not Determined / Condition does not exist.
- 1: Low, (0-33 percent confidence)
- 2: Medium, (34-66 percent confidence)
- 3: High, (67-100 percent confidence)
Bit