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I'm trying to get a numpy array from a specific line region with no success. I have been trying to use ee.Image.sampleRectangle() but it is sampling only Polygons, and when I use it on Line region, I am getting some unwanted points. Is there any other function that sample the images?

polygon = ee.Geometry.LineString(multicoords[0],ee.Projection('EPSG:32636'))
planarPolygon = ee.Geometry(polygon);

band_arrs = image.sampleRectangle(region=polygon)
band_arrs.getInfo()
band_arr_B8A = band_arrs.get('B8A')
np.array(band_arr_B8A.getInfo())
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  • The problem is that a LineString has no area,
    – gene
    Jun 24, 2021 at 9:29
  • I know, but still, ee.Image.sampleRectangle() is sampling an area despite this fact.
    – YosDos
    Jun 24, 2021 at 9:45

1 Answer 1

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Use reduceRegion with a toList reducer.

result = image.reduceRegion(reducer=ee.Reducer.toList(), geometry=polygon, scale=..., crs=...)
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  • Hi Thank, it works fine, but somehow if my LineString falls on one pixel I'm not getting any value.
    – YosDos
    Jun 24, 2021 at 16:17
  • Either buffer it by 1/4 pixel so it's always at least 1/2 a pixel wide, or use the lineString to mask the original image by painting it into an image: mask = ee.Image().byte().paint(lineString, 1); image.updateMask(mask).reduceRegion(reducer=ee.Reducer.toList(), geometry=lineString.bounds(), ...`
    – Noel Gorelick
    Jun 25, 2021 at 1:05

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