Fix future warning (#301)

* fixed future warning * Specify minimum version for scikit-image Co-authored-by: Daniele Nerini <daniele.nerini@gmail.com>
pySTEPS · Sep 25, 2022 · 3905274 · 3905274
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diff --git a/doc/source/user_guide/install_pysteps.rst b/doc/source/user_guide/install_pysteps.rst
@@ -37,7 +37,7 @@ Other optional dependencies include:
 * `pywavelets <https://pywavelets.readthedocs.io/en/latest/>`_
  (for intensity-scale verification)
 * `pandas <https://pandas.pydata.org/>`_ and
- `scikit-image <https://scikit-image.org/>`_ (for advanced feature detection methods)
+ `scikit-image >=0.19 <https://scikit-image.org/>`_ (for advanced feature detection methods)
 * `rasterio <https://rasterio.readthedocs.io/en/latest/>`_ (for the reprojection module)
 
 

diff --git a/pysteps/feature/tstorm.py b/pysteps/feature/tstorm.py
@@ -150,7 +150,7 @@ def detection(
  if np.nanmax(filt_image.flatten()) < minref:
  maxima = np.zeros(filt_image.shape)
  else:
- maxima = skim.h_maxima(filt_image, h=mindiff, selem=struct)
+ maxima = skim.h_maxima(filt_image, h=mindiff, footprint=struct)
  loc_max = np.where(maxima > 0)
 
  loc_max = longdistance(loc_max, mindis)