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- do_region_err_svd(grd_lon, grd_lat, reg_map, reg_err, cor_length, threshold=0.1, scale=1.0, dist_threshold=4.0, maxsel=20, **keywords)
- SVD error map over region to several sub-regions defined by (nsb_lon, nsb_lat)
Inputs:
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1. grd_lon:<array, (nlon)>: longitude
2. grd_lat:<array, (nlat)>: latitude
3. reg_map:<array, (nlon, nlat)>: ratio map defining one region.
4. reg_err:<array, (nlon, nlat)>: err (or BF) defined over given region
5. cor_length <float>: length of the correlation
6. threshold:<float>: all grid boxes with flux (err) below this threshold will be treated as one single region
7. scale:<float>: scaling factor applied to this region
8. dist_threshold:<float>: Max distance/cor_length where correlation will be considered
9. maxsel:<int>: the maximum number of eigen vector to be kept
Returns:
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1. flux:<array, (nlon, nlat, neig)>: new regions masked with sub-region number
2. new_map_lst:<list, t:array>: the layer map with each layer for each sub-regions
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