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| Original file line number | Diff line number | Diff line change |
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@@ -16,3 +16,4 @@ dist.* | |
| !.git/refs/heads | ||
| !.git/objects | ||
| .git/objects/* | ||
| !.git/objects/pack | ||
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,150 @@ | ||
| """ | ||
| Imagery related functions to be used in Python scripts. | ||
| Usage: | ||
| :: | ||
| import grass.script as gs | ||
| gs.imagery.group_to_dict(imagery_group) | ||
| ... | ||
| (C) 2024 by Stefan Blumentrath and the GRASS Development Team | ||
| This program is free software under the GNU General Public | ||
| License (>=v2). Read the file COPYING that comes with GRASS | ||
| for details. | ||
| .. sectionauthor:: Stefan Blumentrath | ||
| """ | ||
|
|
||
| from .core import read_command, warning, fatal | ||
| from .raster import raster_info | ||
|
|
||
|
|
||
| def group_to_dict( | ||
| imagery_group_name, | ||
| subgroup=None, | ||
| dict_keys="semantic_labels", | ||
| dict_values="map_names", | ||
| fill_semantic_label=True, | ||
| env=None, | ||
| ): | ||
| """Create a dictionary to represent an imagery group with metadata. | ||
| Depending on the dict_keys option, the returned dictionary uses either | ||
| the names of the raster maps ("map_names"), their row indices in the group | ||
| ("indices") or their associated semantic_labels ("semantic_labels") as keys. | ||
| The default is to use semantic_labels. Note that map metadata | ||
| of the maps in the group have to be read to get the semantic label, | ||
| in addition to the group file. The same metadata is read when the | ||
| "metadata" is requested as dict_values. Other supported dict_values | ||
| are "map_names" (default), "semantic_labels", or "indices". | ||
| The function can also operate on the level of subgroups. In case a | ||
| non-existing (or empty sub-group) is requested a warning is printed | ||
| and an empty dictionary is returned (following the behavior of i.group). | ||
| Example:: | ||
| >>> run_command("g.copy", raster="lsat7_2000_10,lsat7_2000_10") | ||
| >>> run_command("r.support", raster="lsat7_2000_10", semantic_label="L8_1") | ||
| >>> run_command("g.copy", raster="lsat7_2000_20,lsat7_2000_20") | ||
| >>> run_command("r.support", raster="lsat7_2000_20", semantic_label="L8_2") | ||
| >>> run_command("g.copy", raster="lsat7_2000_30,lsat7_2000_30") | ||
| >>> run_command("r.support", raster="lsat7_2000_30", semantic_label="L8_3") | ||
| >>> run_command("i.group", group="L8_group", | ||
| >>> input="lsat7_2000_10,lsat7_2000_20,lsat7_2000_30") | ||
| >>> group_to_dict("L8_group") # doctest: +ELLIPSIS | ||
| {"L8_1": "lsat7_2000_10", ... "L8_3": "lsat7_2000_30"} | ||
| >>> run_command("g.remove", flags="f", type="group", name="L8_group") | ||
| >>> run_command("g.remove", flags="f", type="raster", | ||
| >>> name="lsat7_2000_10,lsat7_2000_20,lsat7_2000_30") | ||
| :param str imagery_group_name: Name of the imagery group to process (or None) | ||
| :param str subgroup: Name of the imagery sub-group to process (or None) | ||
| :param str dict_keys: What to use as key for dictionary. It can be either | ||
| "semantic_labels" (default), "map_names" or "indices" | ||
| :param str dict_values: What to use as values for dictionary. It can be either | ||
| "map_names" (default), "semanic_labels", "indices" or | ||
| "metadata" (to return dictionaries with full map metadata) | ||
| :param bool fill_semantic_label: If maps in a group do not have a semantic | ||
| label, their index in the group is used | ||
| instead (default). Otherwise None / "none" | ||
| is used. | ||
| :param dict env: Environment to use when parsing the imagery group | ||
| :return: dictionary representing an imagery group with it's maps and their | ||
| semantic labels, row indices in the group, or metadata | ||
| :rtype: dict | ||
| """ | ||
| group_dict = {} | ||
| maps_in_group = ( | ||
| read_command( | ||
| "i.group", | ||
| group=imagery_group_name, | ||
| subgroup=subgroup, | ||
| flags="g", | ||
| quiet=True, | ||
| env=env, | ||
| ) | ||
| .strip() | ||
| .split() | ||
| ) | ||
|
|
||
| if dict_keys not in {"indices", "map_names", "semantic_labels"}: | ||
| raise ValueError(f"Invalid dictionary keys <{dict_keys}> requested") | ||
|
|
||
| if dict_values not in {"indices", "map_names", "semantic_labels", "metadata"}: | ||
| raise ValueError(f"Invalid dictionary values <{dict_values}> requested") | ||
|
|
||
| if subgroup and not maps_in_group: | ||
| warning( | ||
| _("Empty result returned for subgroup <{sg}> in group <{g}>").format( | ||
| sg=subgroup, g=imagery_group_name | ||
| ) | ||
| ) | ||
|
|
||
| for idx, raster_map in enumerate(maps_in_group): | ||
| raster_map_info = None | ||
| # Get raster metadata if needed | ||
| if ( | ||
| dict_values in {"semantic_labels", "metadata"} | ||
| or dict_keys == "semantic_labels" | ||
| ): | ||
| raster_map_info = raster_info(raster_map, env=env) | ||
|
|
||
| # Get key for dictionary | ||
| if dict_keys == "indices": | ||
| key = str(idx + 1) | ||
| elif dict_keys == "map_names": | ||
| key = raster_map | ||
| elif dict_keys == "semantic_labels": | ||
| key = raster_map_info["semantic_label"] | ||
| if not key or key == '"none"': | ||
| if fill_semantic_label: | ||
| key = str(idx + 1) | ||
| else: | ||
| fatal( | ||
| _( | ||
| "Semantic label missing for raster map {m} in group <{g}>." | ||
| ).format(m=raster_map, g=imagery_group_name) | ||
| ) | ||
|
|
||
| if dict_values == "indices": | ||
| val = str(idx + 1) | ||
| elif dict_values == "map_names": | ||
| val = raster_map | ||
| elif dict_values == "semantic_labels": | ||
| val = raster_map_info["semantic_label"] | ||
| elif dict_values == "metadata": | ||
| val = raster_map_info | ||
| if key in group_dict: | ||
| warning( | ||
| _( | ||
| "Key {k} from raster map {m} already present in group dictionary." | ||
| "Overwriting existing entry..." | ||
| ).format(k=key, r=raster_map) | ||
| ) | ||
| group_dict[key] = val | ||
| return group_dict |
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