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"""
ulmo.usgs.ned.core
~~~~~~~~~~~~~~~~~~~~~
This module provides access to the `National Elevation Dataset` provided by the `United States Geological
Survey`_ `National Map`_ system.
.. _National Elevation Dataset: http://ned.usgs.gov/
.. _United States Geological Survey: http://www.usgs.gov/
.. _National Map: http://nationalmap.gov
"""
from __future__ import print_function
from past.builtins import basestring
from geojson import Feature, FeatureCollection, Polygon
import logging
import os
import requests
from ulmo import util
# NED ftp url.
NED_FTP_URL = 'ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/NED/<layer>/IMG/'
# default file path (appended to default ulmo path)
DEFAULT_FILE_PATH = 'usgs/ned/'
layer_dict = {
'Alaska 2 arc-second': '4f70aaece4b058caae3f8de9',
'1 arc-second': '4f70aa71e4b058caae3f8de1',
'1/3 arc-second': '4f70aa9fe4b058caae3f8de5',
'1/9 arc-second': '4f70aac4e4b058caae3f8de7',
}
# configure logging
LOG_FORMAT = '%(message)s'
logging.basicConfig(format=LOG_FORMAT)
log = logging.getLogger(__name__)
log.setLevel(logging.INFO)
def get_available_layers():
"""return list of available data layers
"""
return list(layer_dict.keys())
def get_raster_availability(layer, bbox=None):
"""retrieve metadata for raster tiles that cover the given bounding box
for the specified data layer.
Parameters
----------
layer : str
dataset layer name. (see get_available_layers for list)
bbox : (sequence of float|str)
bounding box of in geographic coordinates of area to download tiles
in the format (min longitude, min latitude, max longitude, max latitude)
Returns
-------
metadata : geojson FeatureCollection
returns metadata including download urls as a FeatureCollection
"""
base_url = 'https://www.sciencebase.gov/catalog/items'
params = [
('parentId', layer_dict[layer]),
('filter', 'tags=IMG'),
('max', 1000),
('fields', 'webLinks,spatial,title'),
('format', 'json'),
]
if bbox:
xmin, ymin, xmax, ymax = [float(n) for n in bbox]
polygon = 'POLYGON (({}))'.format(','.join([(repr(x) + ' ' + repr(y)) for x,y in [
(xmin, ymax),
(xmin, ymin),
(xmax, ymin),
(xmax, ymax),
(xmin, ymax)]]))
params.append(('filter', 'spatialQuery={{wkt:"{}",relation:"{}"}}'.format(polygon, 'intersects')))
features = []
url = base_url
while url:
r = requests.get(url, params)
print('retrieving raster availability from %s' % r.url)
params = [] # not needed after first request
content = r.json()
for item in content['items']:
feature = Feature(geometry=Polygon(_bbox2poly(item['spatial']['boundingBox'])), id=item['id'],
properties={
'name': item['title'],
'layer': layer,
'format': '.img',
'download url': [x for x in item['webLinks'] if x['type']=='download'][0]['uri']}
)
features.append(feature)
if content.get('nextlink'):
url = content['nextlink']['url']
else:
break
return FeatureCollection(features)
def get_raster(layer, bbox, path=None, update_cache=False,
check_modified=False, mosaic=False):
"""downloads National Elevation Dataset raster tiles that cover the given bounding box
for the specified data layer.
Parameters
----------
layer : str
dataset layer name. (see get_available_layers for list)
bbox : (sequence of float|str)
bounding box of in geographic coordinates of area to download tiles
in the format (min longitude, min latitude, max longitude, max latitude)
path : ``None`` or path
if ``None`` default path will be used
update_cache: ``True`` or ``False`` (default)
if ``False`` and output file already exists use it.
check_modified: ``True`` or ``False`` (default)
if tile exists in path, check if newer file exists online and download if available.
mosaic: ``True`` or ``False`` (default)
if ``True``, mosaic and clip downloaded tiles to the extents of the bbox provided. Requires
rasterio package and GDAL.
Returns
-------
raster_tiles : geojson FeatureCollection
metadata as a FeatureCollection. local url of downloaded data is in feature['properties']['file']
"""
_check_layer(layer)
raster_tiles = _download_tiles(get_raster_availability(layer, bbox), path=path,
check_modified=check_modified)
if mosaic:
if path is None:
path = os.path.join(util.get_ulmo_dir(), DEFAULT_FILE_PATH)
util.mkdir_if_doesnt_exist(os.path.join(path, 'by_boundingbox'))
xmin, ymin, xmax, ymax = [float(n) for n in bbox]
uid = util.generate_raster_uid(layer, xmin, ymin, xmax, ymax)
output_path = os.path.join(path, 'by_boundingbox', uid + '.tif')
if os.path.isfile(output_path) and not update_cache:
return output_path
raster_files = [tile['properties']['file'] for tile in raster_tiles['features']]
util.mosaic_and_clip(raster_files, xmin, ymin, xmax, ymax, output_path)
return [output_path]
return raster_tiles
def _check_layer(layer):
"""
make sure the passed layer name is one of the handled options
"""
if not layer in get_available_layers():
err_msg = "The specified layer parameter ({})".format(layer)
err_msg += "\nis not in the available options:"
err_msg += "\n\t".join(get_available_layers())
raise ValueError(err_msg)
def _download_features(feature_ids, path=None, check_modified=False,):
if path is None:
path = os.path.join(util.get_ulmo_dir(), DEFAULT_FILE_PATH)
if isinstance(feature_ids, basestring):
feature_ids = [feature_ids]
tiles =[]
tile_fmt = '.img'
for feature_id in feature_ids:
url = SCIENCEBASE_ITEM_URL % feature_id
metadata = requests.get(url).json()
layer = [a for a in list(layer_dict.keys()) if a in metadata['title']][0]
layer_path = os.path.join(path, layer_dict[layer])
tile_urls = [link['uri'] for link in metadata['webLinks'] if link['type']=='download']
tiles.append({'feature_id': feature_id,
'tiles': util.download_tiles(layer_path, tile_urls, tile_fmt, check_modified),
})
return tiles
def _bbox2poly(bbox):
xmin = bbox['minX']
xmax = bbox['maxX']
ymin = bbox['minY']
ymax = bbox['maxY']
return [[(xmin,ymin), (xmin,ymax), (xmax, ymax), (xmax, ymin), (xmin, ymin)]]
def _download_tiles(tiles, path=None, check_modified=False):
if path is None:
path = os.path.join(util.get_ulmo_dir(), DEFAULT_FILE_PATH)
for tile in tiles['features']:
metadata = tile['properties']
layer_path = os.path.join(path, layer_dict[metadata['layer']])
tile['properties']['file'] = util.download_tiles(layer_path, metadata['download url'], metadata['format'], check_modified)[0]
return tiles
|
