Bugfix for not rounding off negative coordinates in...

Bugfix for not rounding off negative coordinates in get_smallest_boxImYX_that_contains_boxMapYX() and get_smallest_shapelyImPolyOnGrid_that_contains_shapelyImPoly().
Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>

py_tools_ds/geo/vector/topology.py

@@ -71,7 +71,7 @@ def get_footprint_polygon(CornerLonLat, fix_invalid=False):
 
     :param CornerLonLat:    a list of coordinate tuples like [[lon,lat], [lon. lat], ..]
                             in clockwise or counter clockwise order
-    :param fix_invalid:     fix invalid output polygon by returning its convex hull (somtimes this can be different)
+    :param fix_invalid:     fix invalid output polygon by returning its convex hull (sometimes this can be different)
     :return:                a shapely.Polygon() object
     """
 
@@ -93,7 +93,7 @@ def get_footprint_polygon(CornerLonLat, fix_invalid=False):
 def get_smallest_boxImYX_that_contains_boxMapYX(box_mapYX, gt_im, tolerance_ndigits=5):
     """Return image coordinates of the smallest box at the given coordinate grid that contains the given map coords box.
 
-    :param box_mapYX:           input box ccordinates as YX-tuples
+    :param box_mapYX:           input box coordinates as YX-tuples
     :param gt_im:               geotransform of input box
     :param tolerance_ndigits:   tolerance to avoid that output image coordinates are rounded to next integer although
                                 they have been very close to an integer before (this avoids float rounding issues)
@@ -105,7 +105,7 @@ def get_smallest_boxImYX_that_contains_boxMapYX(box_mapYX, gt_im, tolerance_ndig
 
     # round min coords off and max coords on but tolerate differences below n decimal digits as the integer itself
     xmin, ymin, xmax, ymax = np.round([xmin, ymin, xmax, ymax], tolerance_ndigits)
-    xmin, ymin, xmax, ymax = int(xmin), math.ceil(ymin), math.ceil(xmax), int(ymax)
+    xmin, ymin, xmax, ymax = math.floor(xmin), math.ceil(ymin), math.ceil(xmax), math.floor(ymax)
 
     return (ymax, xmin), (ymax, xmax), (ymin, xmax), (ymin, xmin)  # UL_YX,UR_YX,LR_YX,LL_YX
 
@@ -114,6 +114,7 @@ def get_largest_onGridPoly_within_poly(outerPoly, gt, rows, cols):
     oP_xmin, oP_ymin, oP_xmax, oP_ymax = outerPoly.bounds
     xmin, ymax = find_nearest_grid_coord((oP_xmin, oP_ymax), gt, rows, cols, direction='SE')
     xmax, ymin = find_nearest_grid_coord((oP_xmax, oP_ymin), gt, rows, cols, direction='NW')
+
     return box(xmin, ymin, xmax, ymax)
 
 
@@ -122,7 +123,10 @@ def get_smallest_shapelyImPolyOnGrid_that_contains_shapelyImPoly(shapelyPoly):
     The returned shapely polygon contains image coordinates."""
     xmin, ymin, xmax, ymax = shapelyPoly.bounds  # image_coords-bounds
 
-    return box(int(xmin), int(ymin), math.ceil(xmax), math.ceil(ymax))  # round min coords off and max coords on
+    # round min coords off and max coords on
+    out_poly = box(math.floor(xmin), math.floor(ymin), math.ceil(xmax), math.ceil(ymax))
+
+    return out_poly
 
 
 def find_line_intersection_point(line1, line2):
@@ -136,11 +140,12 @@ def find_line_intersection_point(line1, line2):
     d = (det(*line1), det(*line2))
     x = det(d, xdiff) / div
     y = det(d, ydiff) / div
+
     return x, y
 
 
 def polyVertices_outside_poly(inner_poly, outer_poly, tolerance=0):
-    """Check if a shapely polygon (inner_poly) contains vertices that do not intersect another polygon (outer_poly)
+    """Check if a shapely polygon (inner_poly) contains vertices that do not intersect another polygon (outer_poly).
 
     :param inner_poly: the polygon with the vertices to check
     :param outer_poly: the polygon where all vertices have to be inside