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GEE(Python)遥感时序影像获取的三种方法

  • 2026-02-06 20:30:22
GEE(Python)遥感时序影像获取的三种方法

遥感时序影像是开展时序分析的第一步,如何高效获取时序影像非常关键。对于掌握Google Earth Engine的小伙伴来说,这已经是必修的技巧。今天,我们基于GEE(Python)讲解三种方法,希望对您科研有所帮助。

首先,我们讲第一种最常见的方法:filterDate函数:该函数包含start和end两个参数,支持String、ee.Date两种类型,常见代码如下:
imgs = (ee.ImageCollection('LANDSAT/LC09/C02/T1_L2')          .filterDate('2025-06-01','2025-11-01')          .filterBounds(Map.user_roi)          .filter(ee.Filter.lt('CLOUD_COVER',30))          )print(imgs.size().getInfo())visualization = {  'bands': ['SR_B4''SR_B3''SR_B2'],  'min'0.0,  'max'30000,}Map.addLayer(imgs.median(),visualization,'Landsat-9')Map
以上,我们得到2025年6月至11月的Landsat 9影像共计5幅,并且可以合成无云的高质量结果。值得注意的是‘2025-11-01’这一天是不包含的。然而,科研上我们常常需要得到特定年份特地月份的影像,用于植被生长监测。这时候,我们通常采用ee.Filter.calendarRange()函数,它包括起始时间star,截至时间end以及日历字段名file,常见代码如下:
imgs = (ee.ImageCollection('LANDSAT/LC09/C02/T1_L2')          .filter(ee.Filter.calendarRange(2023,2025,'year'))          .filter(ee.Filter.calendarRange(6,11,'month'))          .filterBounds(Map.user_roi)          .filter(ee.Filter.lt('CLOUD_COVER',30))          )print(imgs.size().getInfo())visualization = {  'bands': ['SR_B5''SR_B4''SR_B3'],  'min'0.0,  'max'40000,}Map.addLayer(imgs.median(),visualization,'Landsat-9')Map
这时候,我们从2023年-2025年,每年的6-11月的影像时序集合。这里需要注意:包含2025年以及包含11月。这样,得到了共计21幅时序影像。以上的方法都是GEE官网提供的函数,是否还有更简便的方法呢?答案是有的,这里我们需要提到geemap里面提供的create_timeseries()函数:这个函数可以自动帮你按照需要合成年/月/日尺度的数据,功能非常强大。例如,我们要合成年尺度的影像集合,并自动裁剪roi:
imgs = (ee.ImageCollection('LANDSAT/LC09/C02/T1_L2')          .filter(ee.Filter.lt('CLOUD_COVER',30))          )images = geemap.create_timeseries(    imgs, '2023-01-01''2026-01-01', roi, frequency='year', reducer='median')print(images.size().getInfo())Map.addLayer(images.median(),visualization,'Landsat-9')Map
以上是我们讲解的3种方法,对GEE(Python)感兴趣的,尤其是全球制图分析与深度学习领域,可以关注我们近期的课程培训,涉及GEE在Python的本地环境下各种操作和应用,涵盖了从数据筛选→数据处理→数据分析→数据建模→深度学习模型构建→全球数据的可视化制图分析:

2026寒假特训 | GEE(Python版本)深度学习与全球制图分析实战特训教学


2026寒假培训 | Google  Earth Engine(GEE)遥感+AI大模型科研实战特训教学

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  1. CONNECT:[ UseTime:0.000898s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001309s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000622s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000730s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001319s ]
  6. SELECT * FROM `set` [ RunTime:0.011975s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001954s ]
  8. SELECT * FROM `article` WHERE `id` = 465964 LIMIT 1 [ RunTime:0.103292s ]
  9. UPDATE `article` SET `lasttime` = 1770502216 WHERE `id` = 465964 [ RunTime:0.005312s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.002648s ]
  11. SELECT * FROM `article` WHERE `id` < 465964 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.010224s ]
  12. SELECT * FROM `article` WHERE `id` > 465964 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.010597s ]
  13. SELECT * FROM `article` WHERE `id` < 465964 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.015403s ]
  14. SELECT * FROM `article` WHERE `id` < 465964 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012774s ]
  15. SELECT * FROM `article` WHERE `id` < 465964 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.028274s ]
0.374446s