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- # -*- coding: utf-8 -*-
- """
- Created on Tue Apr 2 18:57:42 2013
- @author: pietro
- """
- from grass.pygrass.gis.region import Region
- from grass.pygrass.raster import RasterRow
- from grass.pygrass.functions import coor2pixel
- def get_start_end_index(bbox_list):
- """Convert a Bounding Box to a list of the index of
- column start, end, row start and end
- """
- ss_list = []
- reg = Region()
- for bbox in bbox_list:
- r_start, c_start = coor2pixel((bbox.west, bbox.north), reg)
- r_end, c_end = coor2pixel((bbox.east, bbox.south), reg)
- ss_list.append((int(r_start), int(r_end), int(c_start), int(c_end)))
- return ss_list
- def patch_row(rast, rasts, bboxes):
- """Patch a row of bound boxes."""
- sei = get_start_end_index(bboxes)
- # instantiate two buffer
- buff = rasts[0][0]
- rbuff = rasts[0][0]
- r_start, r_end, c_start, c_end = sei[0]
- for row in xrange(r_start, r_end):
- for col, ras in enumerate(rasts):
- r_start, r_end, c_start, c_end = sei[col]
- buff = ras.get_row(row, buff)
- rbuff[c_start:c_end] = buff[c_start:c_end]
- rast.put_row(rbuff)
- def patch_map(raster, mapset, mset_str, bbox_list, overwrite=False,
- start_row=0, start_col=0):
- """Patch raster using a bounding box list to trim the raster."""
- # Instantiate the RasterRow input objects
- rast = RasterRow(raster, mapset)
- rtype = RasterRow(name=raster, mapset=mset_str % (0, 0))
- rtype.open('r')
- rast.open('w', mtype=rtype.mtype, overwrite=overwrite)
- rtype.close()
- rasts = []
- for row, rbbox in enumerate(bbox_list):
- rrasts = []
- for col in range(len(rbbox)):
- rrasts.append(RasterRow(name=raster,
- mapset=mset_str % (start_row + row,
- start_col + col)))
- rrasts[-1].open('r')
- rasts.append(rrasts)
- patch_row(rast, rrasts, rbbox)
- for rrast in rasts:
- for rast_ in rrast:
- rast_.close()
- rast.close()
- #import ipdb; ipdb.set_trace()
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