Gee: analyze the change of spatial centroid of remote sensing image [centroid acquisition analysis]

One 、 Preface

The center of mass is the geometric center of the face element , By analyzing its spatial changes, we can know the transfer characteristics of its spatial Center , It is often used to analyze the change of center of gravity .

utilize GEE How to get the centroid of image space （centroid）?

Two 、python Code

• ee.Geometry.centroid()

 

python The code is as follows ：

#  Define get centroid function 
def getGeom(image):
    return ee.Feature(image.geometry().centroid(), {'foo': 1})

#  load Landsat8 image 
collection = ee.ImageCollection('LANDSAT/LC08/C01/T1') \
    .filterBounds(ee.Geometry.Point(-122.262, 37.8719)) \
    .filterDate('2014-06-01', '2014-10-01')

#  For each image Map
featureCollection = ee.FeatureCollection(collection.map(getGeom))

#  Load display 
Map = geemap.Map()
Map.centerObject(featureCollection, 15)
Map.addLayer(featureCollection, {'collor':'yellow'}, 'image centroid')
Map

        

  3、 ... and 、 Summary

1. have access to ee.Geometry.centroid() Get the location of the space centroid
2. This code also shows how to synthesize FeatureCollection Methods

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Reference resources ：

1. https://developers.google.com/earth-engine/apidocs/ee-geometry-centroid?hl=en
2. earthengine-py-notebooks/get_image_centroid.ipynb at master · giswqs/earthengine-py-notebooks · GitHub