pytroll / pytroll/pyresample

Duplicate data when resampling to Eckert IV projection and area spans 180th meridian

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#266 7 comments 0 reactions 1 assignee View on GitHub

@pnuu is already working on this.

Since Apr 9, 2020.

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Description

Code Sample, a minimal, complete, and verifiable piece of code
from satpy import Scene
import glob

fnames = glob.glob('IMG_DK*')
glbl = Scene(reader='ahi_hrit', filenames=fnames)
glbl.load(['dust'])
lcl = glbl.resample("eckert_iv_global_2km", radius_of_influence=30e3)
lcl.save_datasets(base_dir='/tmp')

And the area definition:

eckert_iv_global_2km:
  description: Eckert IV global area with 2 km resolution
  projection:
    ESRI:54012
  shape:
    height: 8313
    width: 16921
  area_extent:
    lower_left_xy: [-16921201.240, -8245471.428]
    upper_right_xy: [16916798.760, 8250528.572]
Problem description

Some of the data are duplicated outside the valid area.

Expected Output

This image is created with gdalwarp from a full disk image in geos projection with Satpy.

gdalwarp_eckert_iv_scaled

Actual Result, Traceback if applicable

This is the (scaled) output from the above code and area definition.

satpy_eckert_iv_scaled

Note in particular the (duplicate) cloud formation in top-left and top-right regions.

Versions of Python, package at hand and relevant dependencies

Satpy: 0.16.2.dev149+g4313bb4f
Pyresample: 1.15.0+2.g3d6d38d
Pyproj: 2.4.1
Proj: 6.2.1

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