def get_longitudes_and_latitudes(self,
nx=180,
ny=172,
lat_center=49.65698,
lon_center=-96.99443,
dx=45000):
"""
get longitudes and latitudes of the AMNO grid
"""
#coordinates with respect to the pole, divided by
#dx
[xc, yc] = latlon2psxy(lat_center, lon_center)
self.lon_center = lon_center
self.lat_center = lat_center
self.dx = dx
self.dy = dx
print('Coordinates of the grid center ', xc * dx, yc * dx)
xmin = xc - (nx - 1) / 2.0
ymin = yc - (ny - 1) / 2.0
self.x_min = xmin
self.y_min = ymin
print(
'These coordinates can be verified with cccma site points (2,2) and (181, 173) respectively'
)
print('lower left: ', psxy2latlon(xmin, ymin))
print('upper right: ', psxy2latlon(xmin + nx - 1, ymin + ny - 1))
longitudes = np.zeros((nx, ny))
latitudes = np.zeros((nx, ny))
for i in range(nx):
for j in range(ny):
latitudes[i,
j], longitudes[i,
j] = psxy2latlon(xmin + i, ymin + j)
return longitudes, latitudes
def get_longitudes_and_latitudes(self, nx = 180, ny = 172,
lat_center = 49.65698,
lon_center = -96.99443, dx = 45000):
"""
get longitudes and latitudes of the AMNO grid
"""
#coordinates with respect to the pole, divided by
#dx
[xc, yc] = latlon2psxy(lat_center, lon_center)
self.lon_center = lon_center
self.lat_center = lat_center
self.dx = dx
self.dy = dx
print 'Coordinates of the grid center ', xc * dx, yc * dx
xmin = xc - (nx - 1) / 2.0
ymin = yc - (ny - 1) / 2.0
self.x_min = xmin
self.y_min = ymin
print 'These coordinates can be verified with cccma site points (2,2) and (181, 173) respectively'
print 'lower left: ', psxy2latlon(xmin, ymin)
print 'upper right: ', psxy2latlon(xmin + nx - 1 , ymin + ny - 1)
longitudes = np.zeros((nx, ny))
latitudes = np.zeros((nx, ny))
for i in range(nx):
for j in range(ny):
latitudes[i,j], longitudes[i, j] = psxy2latlon(xmin + i, ymin + j)
return longitudes, latitudes
def get_indices_of_the_closest_point_to(self, lon, lat):
"""
get indices of the point closest to the coord (lon, lat)
"""
[x, y] = latlon2psxy(lat, lon)
return round(x - self.x_min), round(y - self.y_min)
def get_indices_of_the_closest_point_to(self, lon, lat):
"""
get indices of the point closest to the coord (lon, lat)
"""
[x, y] = latlon2psxy(lat, lon)
return round(x - self.x_min), round(y - self.y_min)