def load_map(projection, center, height, width):
CACHE_DIR = app.config['CACHE_DIR']
filename = _get_filename(projection, center, height, width)
if _maps_cache.get(filename) is None or True:
try:
basemap = pickle.load(open(CACHE_DIR + "/" + filename))
except:
if projection in ['npstere', 'spstere']:
basemap = Basemap(
resolution='i',
ellps='WGS84',
projection=projection,
boundinglat=center[0],
lon_0=center[1])
elif projection == 'merc':
basemap = Basemap(
resolution='i',
ellps='WGS84',
projection=projection,
llcrnrlat=height[0],
llcrnrlon=height[1],
urcrnrlat=width[0],
urcrnrlon=width[1],
)
else:
basemap = Basemap(
resolution='i',
ellps='WGS84',
projection=projection,
lat_0=center[0],
lon_0=center[1],
height=height,
width=width)
basemap.filename = filename
def do_pickle(basemap, filename):
pickle.dump(basemap, open(filename, 'wb'), -1)
if not os.path.isdir(CACHE_DIR):
os.makedirs(CACHE_DIR)
t = threading.Thread(target=do_pickle, args=(basemap, CACHE_DIR +
"/" + filename))
t.daemon = True
t.start()
_maps_cache[filename] = basemap
else:
basemap = _maps_cache[filename]
return basemap
def load_map(projection, center, height, width):
CACHE_DIR = app.config['CACHE_DIR']
filename = _get_filename(projection, center, height, width)
if _maps_cache.get(filename) is None or True:
try:
basemap = pickle.load(open(CACHE_DIR + "/" + filename))
except:
if projection in ['npstere', 'spstere']:
basemap = Basemap(resolution='i',
ellps='WGS84',
projection=projection,
boundinglat=center[0],
lon_0=center[1])
elif projection == 'merc':
basemap = Basemap(
resolution='i',
ellps='WGS84',
projection=projection,
llcrnrlat=height[0],
llcrnrlon=height[1],
urcrnrlat=width[0],
urcrnrlon=width[1],
)
else:
basemap = Basemap(resolution='i',
ellps='WGS84',
projection=projection,
lat_0=center[0],
lon_0=center[1],
height=height,
width=width)
basemap.filename = filename
def do_pickle(basemap, filename):
pickle.dump(basemap, open(filename, 'wb'), -1)
if not os.path.isdir(CACHE_DIR):
os.makedirs(CACHE_DIR)
t = threading.Thread(target=do_pickle,
args=(basemap, CACHE_DIR + "/" + filename))
t.daemon = True
t.start()
_maps_cache[filename] = basemap
else:
basemap = _maps_cache[filename]
return basemap
def load_map(projection: str,
center: tuple,
height: float,
width: float,
min_lat: float = 0) -> Basemap:
CACHE_DIR = current_app.config['CACHE_DIR']
filename = _get_filename(projection, center, height, width)
def get_resolution(h: float, w: float) -> str:
area_km = (h * w) / (1000 * 1000)
if area_km < 10000:
return 'f' # full resolution
elif area_km < 100000:
return 'h' # high resolution
elif area_km < 1000000:
return 'i' # intermediate resolution
elif area_km < 10000000:
return 'l' # low resolution
else:
return 'c' # crude resolution
if _maps_cache.get(filename) is None or True:
filename = "".join([CACHE_DIR, "/", filename])
try:
basemap = pickle.load(open(filename))
except:
if projection in ['npstere', 'spstere']:
basemap = Basemap(
resolution=get_resolution(height, width),
area_thresh=((height * width) / (1000 * 1000)) *
0.00001, #display islands whose area is 0.001% of displayed area
ellps='WGS84',
projection=projection,
boundinglat=min_lat,
lon_0=center[1],
)
elif projection == 'merc':
basemap = Basemap(
resolution='c',
#area_thresh=((height*width)/(1000*1000))*0.00001 , #display islands whose area is 0.001% of displayed area
ellps='WGS84',
projection=projection,
llcrnrlat=height[0],
llcrnrlon=width[0],
urcrnrlat=height[1],
urcrnrlon=width[1])
else:
basemap = Basemap(
resolution=get_resolution(height, width),
area_thresh=((height * width) / (1000 * 1000)) *
0.00001, #display islands whose area is 0.001% of displayed area
ellps='WGS84',
projection=projection,
lat_0=center[0],
lon_0=_convert_to_bounded_lon(center[1]),
height=height,
width=width)
basemap.filename = filename
def do_pickle(basemap: Basemap, filename: str) -> None:
pickle.dump(basemap, open(filename, 'wb'), -1)
if not os.path.isdir(CACHE_DIR):
os.makedirs(CACHE_DIR)
t = threading.Thread(target=do_pickle, args=(basemap, filename))
t.daemon = True
t.start()
_maps_cache[filename] = basemap
else:
basemap = _maps_cache[filename]
return basemap