示例#1
0
 def ingrid(self,x,y,retInds=False):
   '''in polygon of region border'''
   xb,yb=self.border()
   i=calc.inpolygon(x,y,xb,yb)
   if retInds:
     return x[i!=0], y[i!=0], np.where(i)[0]
   else: return x[i!=0], y[i!=0]
示例#2
0
def grid_vicinity(grid, x, y, margin=5, rect=False, retinds=False):
    '''
  Returns True for x,y points inside roms grid boundary plus margin.
  Margin is the number of cells to add around the grid.

  if rect is True returns True for all points in the smallest 2d xy grid
  (usually a rectangle) around the grid.
  In this case,margin is the rectangle margin, ie, in units of xy, not
  in  units of grid

  if retinds, in the case of rect, the rectangle j1,j2 and i1,i2 are
  also returned (cond,inds=grid_vicinity(....); i1,i2,j1,j2=inds)

  mma, TAMU 2011
  '''

    xg = netcdf.use(grid, 'lon_rho')
    yg = netcdf.use(grid, 'lat_rho')
    xlim = xg.min(), xg.max()
    ylim = yg.min(), yg.max()

    if x.ndim == 1 and y.ndim == 1: x, y = np.meshgrid(x, y)

    if rect:
        out = np.zeros(x.shape, 'bool')
        i1, i2, j1, j2 = calc.ij_limits(x, y, xlim, ylim, margin)
        out[j1:j2, i1:i2] = 1
    else:
        from roms import Grid
        g = Grid(grid)
        xb, yb = g.border(margin=-margin)
        out = calc.inpolygon(x, y, xb, yb)

    if rect and retinds: return out, (i1, i2, j1, j2)
    else: return out
示例#3
0
def grid_vicinity(grid,x,y,margin=5,rect=False,retinds=False):
  '''
  Returns True for x,y points inside roms grid boundary plus margin.
  Margin is the number of cells to add around the grid.

  if rect is True returns True for all points in the smallest 2d xy grid
  (usually a rectangle) around the grid.
  In this case,margin is the rectangle margin, ie, in units of xy, not
  in  units of grid

  if retinds, in the case of rect, the rectangle j1,j2 and i1,i2 are
  also returned (cond,inds=grid_vicinity(....); i1,i2,j1,j2=inds)

  mma, TAMU 2011
  '''

  xg=netcdf.use(grid,'lon_rho')
  yg=netcdf.use(grid,'lat_rho')
  xlim=xg.min(),xg.max()
  ylim=yg.min(),yg.max()

  if x.ndim==1 and y.ndim==1: x,y=np.meshgrid(x,y)

  if rect:
    out=np.zeros(x.shape,'bool')
    i1,i2,j1,j2=calc.ij_limits(x,y,xlim,ylim,margin)
    out[j1:j2,i1:i2]=1
  else:
    from roms import Grid
    g=Grid(grid)
    xb,yb=g.border(margin=-margin)
    out=calc.inpolygon(x,y,xb,yb)

  if rect and retinds: return out,(i1,i2,j1,j2)
  else: return out
示例#4
0
    def centres(self):
        '''
    Needed for area weighted averages
    '''
        from okean import calc
        elements = []
        for e in self.q.IKLE2:
            element = []
            for n in e:
                element.append((self.x[n], self.y[n]))

            elements.append(element)

        elements = np.asarray(elements)
        X = elements[:, :, 0]
        Y = elements[:, :, 1]
        n = len(X)
        Cx = np.zeros(n, 'f')
        Cy = np.zeros(n, 'f')
        A = np.zeros(n, 'f')
        inp = np.zeros(n, 'bool')
        for i in range(n):
            A[i] = calc.poly_area(X[i], Y[i])
            Cx[i], Cy[i] = calc.poly_centroid(X[i], Y[i])
            # check if centre is inside polygon:
            inp[i] = calc.inpolygon(Cx[i], Cy[i], X[i], Y[i])

        self.xc = Cx
        self.yc = Cy
        if any(~inp): A = np.ma.masked_where(~inp, A)
        self.area = A
        self.inp = inp
示例#5
0
  def centres(self):
    '''
    Needed for area weighted averages
    '''
    from okean import calc
    elements = []
    for e in self.q.IKLE2:
      element = []
      for n in e:
        element.append((self.x[n],self.y[n]))

      elements.append(element)

    elements=np.asarray(elements)
    X=elements[:,:,0]
    Y=elements[:,:,1]
    n=len(X)
    Cx=np.zeros(n,'f')
    Cy=np.zeros(n,'f')
    A=np.zeros(n,'f')
    inp=np.zeros(n,'bool')
    for i in range(n):
      A[i]=calc.poly_area(X[i],Y[i])
      Cx[i],Cy[i]=calc.poly_centroid(X[i],Y[i])
      # check if centre is inside polygon:
      inp[i]=calc.inpolygon(Cx[i],Cy[i],X[i],Y[i])

    self.xc=Cx
    self.yc=Cy
    if any(~inp): A=np.ma.masked_where(~inp,A)
    self.area=A
    self.inp=inp
示例#6
0
 def ingrid(self, x, y, retInds=False):
     '''in polygon of region border'''
     xb, yb = self.border()
     i = calc.inpolygon(x, y, xb, yb)
     if retInds:
         return x[i != 0], y[i != 0], np.where(i)[0]
     else:
         return x[i != 0], y[i != 0]
示例#7
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    def inside(self, x, y):
        '''Returns data inside the polygon x,y
      If len(x)==2, the polygon is the rectangle
      with limits x[0],x[1] and y[0],y[1]
      Return lon, lat, name and country

      -180<=x<=180; -90<=y<=90
    '''
        if len(x) == 2:  # rectangle
            x = x[0], x[1], x[1], x[0]
            y = y[0], y[0], y[1], y[1]

        inp = calc.inpolygon(self.lon, self.lat, x, y)
        return self.lon[inp], self.lat[inp], self.name[inp], self.country[inp]
示例#8
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文件: locations.py 项目: jcmt/okean
  def inside(self,x,y):
    '''Returns data inside the polygon x,y
      If len(x)==2, the polygon is the rectangle
      with limits x[0],x[1] and y[0],y[1]
      Return lon, lat, name and country

      -180<=x<=180; -90<=y<=90
    ''' 
    if len(x)==2: # rectangle
      x=x[0],x[1],x[1],x[0]
      y=y[0],y[0],y[1],y[1]

    inp=calc.inpolygon(self.lon,self.lat,x,y)
    return self.lon[inp],self.lat[inp],self.name[inp],self.country[inp]
示例#9
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  def locate(self,varname,quiet=1):

    # find points inside grid:
    inds=self.roms.grid.ingrid(self.x,self.y)
    inds=np.where(inds)[0]

    # lon, lat:
    lon,lat=self.model_lon_lat(varname)

    ntimes=len(self.t)
    V=np.ma.array(())

    Iind,Jind,Tind=[],[],[]
    INDS=[]
    for c in range(ntimes):
      if not quiet: print('  %s   %d of %d' % (self.t[c].isoformat(' '),c,ntimes))
      if not c in inds:
        if not quiet: print(' - outside domain in time %s'%t[c].isoformat())
        INDS+=[(-1,-1,-1)]
        continue

      # find time indices:
      if self.t[c]>=self.roms.time[0] and self.t[c]<=self.roms.time[-1]:
        i0=np.where(self.roms.time<=self.t[c])[0][-1]
      else: i0=-1

      # find i,j bbox:
      d=(lon-self.x[c])**2+(lat-self.y[c])**2
      i,j=np.where(d==d.min())
      i=i[0]
      j=j[0]
      isIn=False
      for I in [i-1,i]:
        if I+1>=lon.shape[0] or I<0: continue
        for J in [j-1,j]:
          if J+1>=lon.shape[1] or J<0: continue

          xp=[lon[I,J],lon[I,J+1],lon[I+1,J+1],lon[I+1,J]]
          yp=[lat[I,J],lat[I,J+1],lat[I+1,J+1],lat[I+1,J]]
          if calc.inpolygon(self.x[c],self.y[c],xp,yp):
            i,j=I,J
            isIn=True
            break
        else:
          # Continue if the inner loop wasn't broken.
          continue
        # Inner loop was broken, break the outer.
        break

      INDS+=[(i,j,i0)]

      Iind+=[ i,   i, i+1, i+1 ]
      Jind+=[ j, j+1, j+1,   j ]
      Tind+=[i0,  i0,  i0,  i0 ]

      if i0<0: ii0=i0
      else: ii0=i0+1

      Iind+=[  i,    i,  i+1, i+1 ]
      Jind+=[  j,  j+1,  j+1,   j ]
      Tind+=[ii0,  ii0,  ii0, ii0 ]


    Iind=np.asarray(Iind)
    Jind=np.asarray(Jind)
    Tind=np.asarray(Tind)
    INDS=np.asarray(INDS)

    # deal with points at boundary ! just in case...
    imax,jmax=[k-1 for k in lon.shape]
    tmax=self.roms.time.size-1
    Iind=np.where(Iind>imax,imax,Iind)
    Jind=np.where(Jind>jmax,jmax,Jind)
    Tind=np.where(Tind>tmax,tmax,Tind)

    inds=[(Iind[i],Jind[i],Tind[i]) for i in range(len(Iind))]
    uinds=np.asarray(list(frozenset(inds)))

    tag=self.horiz_var_type(varname)
    self.inds0[tag]=INDS
    self.uinds[tag]=uinds

    return INDS, uinds
示例#10
0
 def ingrid(self,x,y,**kargs):#,retInds=False):
   '''in polygon of region border'''
   xb,yb=self.border(**kargs)
   return calc.inpolygon(x,y,xb,yb)
示例#11
0
def his2gnome(fname,
              his,
              grd=False,
              nomask=False,
              gshhsMask=True,
              xylim=False,
              dates=False,
              ij=(1, 1)):
    '''
  Creates GNOME wind file
  Ex:
    his2gnome(out,his,grd,dates=dates,ij=(2,2))

  if gshhsMask, the high res mask file mask_gshhs.npy will be created at 1st usage.
  Mask is based on high (h) resolution gshhs data which must be available (env variable
  GSHHS_MASK must be set). 
  '''

    if not grd: grd = his
    deta, dxi = ij

    dims = netcdf.fdim(his)
    xi, eta = dims['xi_rho'], dims['eta_rho']
    xi0, eta0 = xi, eta

    nc0 = netcdf.ncopen(his)
    time = netcdf.nctime(nc0, 'ocean_time')
    # for roms agrif:
    #t=netcdf.use(nc0,'scrum_time')
    #time=netcdf.num2date(t,'seconds since %d-01-01' % year0)

    x0 = netcdf.use(grd, 'lon_rho')
    y0 = netcdf.use(grd, 'lat_rho')
    ang = netcdf.use(grd, 'angle')

    if not xylim is False:
        xlim = xylim[:2]
        ylim = xylim[2:]
        i1, i2, j1, j2 = calc.ij_limits(x0, y0, xlim, ylim)
        print(i1, i2, j1, j2)
        xi = i2 - i1
        eta = j2 - j1
    else:
        i1, i2 = 0, xi
        j1, j2 = 0, eta

    XI = '%d:%d:%d' % (i1, i2, dxi)
    ETA = '%d:%d:%d' % (j1, j2, deta)

    xi = len(range(i1, i2, dxi))
    eta = len(range(j1, j2, deta))
    # create file:
    create_uv(fname, xi, eta)

    nc = netcdf.ncopen(fname, 'a')
    for v0, v in ('lon_rho', 'lon'), ('lat_rho', 'lat'), ('mask_rho',
                                                          'mask'), ('h',
                                                                    'depth'):
        print('filling %s with %s' % (v, v0))
        nc.vars[v][:] = netcdf.use(grd, v0, xi_rho=XI, eta_rho=ETA)

    if nomask:
        print('NO MASK !!!')
        nc.vars['mask'][:] = 1

    if gshhsMask:
        try:
            mask = np.load('mask_gshhs.npy')
        except:
            mask = 1 + 0 * netcdf.use(nc0, 'mask_rho', xi_rho=XI, eta_rho=ETA)
            mask = mask.astype('bool')
            x = netcdf.use(grd, 'lon_rho', xi_rho=XI, eta_rho=ETA)
            y = netcdf.use(grd, 'lat_rho', xi_rho=XI, eta_rho=ETA)

            from okean import gshhs
            axis = x.min(), x.max(), y.min(), y.max()
            g = gshhs.gshhs(axis,
                            resolution='h',
                            area_thresh=0.,
                            max_level=2,
                            clip=True)
            for lon, lat, level in zip(g.lon, g.lat, g.level):
                if level == 1:  # land
                    print('mask ', lon.shape)
                    i = calc.inpolygon(x, y, lon, lat)
                    mask = mask & ~i

            mask.dump('mask_gshhs.npy')

        nc.vars['mask'][:] = mask

    x = x0[j1:j2:deta, i1:i2:dxi]
    y = y0[j1:j2:deta, i1:i2:dxi]
    ang = ang[j1:j2:deta, i1:i2:dxi]

    n = -1
    for it in range(len(time)):
        if not dates is False:
            d0, d1 = dates
            if time[it] < d0 or time[it] >= d1: continue

        n += 1
        U = np.zeros((eta0, xi0), 'f')
        V = np.zeros((eta0, xi0), 'f')

        nc.vars['time'][n] = netcdf.date2num(time[it], tunits)

        # for roms agrif:
        #u=netcdf.use(nc0,'u',time=it,s_rho=-1)
        #v=netcdf.use(nc0,'v',time=it,s_rho=-1)
        u = netcdf.use(nc0, 'u', ocean_time=it, s_rho=-1)
        v = netcdf.use(nc0, 'v', ocean_time=it, s_rho=-1)

        # mask extrap:
        print('mask extrap...')

        u = calc.mask_extrap(x0, y0, np.ma.masked_where(u == 0, u))
        v = calc.mask_extrap(x0, y0, np.ma.masked_where(v == 0, v))

        U[:, 1:-1] = 0.5 * (u[:, :-1] + u[:, 1:])
        U[:, 0] = u[:, 0]
        U[:, -1] = u[:, -1]

        V[1:-1, :] = 0.5 * (v[:-1.:] + v[1:, :])
        V[0, :] = v[0, :]
        V[-1, :] = v[-1, :]

        U = U[j1:j2, i1:i2]
        V = V[j1:j2, i1:i2]

        U = U[j1:j2:deta, i1:i2:dxi]
        V = V[j1:j2:deta, i1:i2:dxi]

        # rotate uv:
        print('rotating ...')
        U, V = calc.rot2d(U, V, -ang)

        print('filling uv', n, time[it])
        nc.vars['u'][n, ...] = U
        nc.vars['v'][n, ...] = V

    nc.close()
    nc0.close()
示例#12
0
文件: gnome.py 项目: jcmt/okean
def his2gnome(fname,his,grd=False,nomask=False,gshhsMask=True,xylim=False,dates=False,ij=(1,1)):
  '''
  Creates GNOME wind file
  Ex:
    his2gnome(out,his,grd,dates=dates,ij=(2,2))

  if gshhsMask, the high res mask file mask_gshhs.npy will be created at 1st usage.
  Mask is based on high (h) resolution gshhs data which must be available (env variable
  GSHHS_MASK must be set). 
  '''

  if not grd: grd=his
  deta,dxi=ij

  dims=netcdf.fdim(his)
  xi,eta=dims['xi_rho'],dims['eta_rho']
  xi0,eta0=xi,eta

  nc0=netcdf.ncopen(his)
  time=netcdf.nctime(nc0,'ocean_time')
  # for roms agrif:
  #t=netcdf.use(nc0,'scrum_time')
  #time=netcdf.num2date(t,'seconds since %d-01-01' % year0)

  x0=netcdf.use(grd,'lon_rho')
  y0=netcdf.use(grd,'lat_rho')
  ang=netcdf.use(grd,'angle')

  if not xylim is False:
    xlim=xylim[:2]
    ylim=xylim[2:]
    i1,i2,j1,j2=calc.ij_limits(x0,y0,xlim,ylim)
    print i1,i2,j1,j2
    xi=i2-i1
    eta=j2-j1
  else:
    i1,i2=0,xi
    j1,j2=0,eta

  XI  ='%d:%d:%d' %(i1,i2,dxi)
  ETA ='%d:%d:%d' %(j1,j2,deta)

  xi=len(range(i1,i2,dxi))
  eta=len(range(j1,j2,deta))
  # create file:
  create_uv(fname,xi,eta)

  nc=netcdf.ncopen(fname,'a')
  for v0,v in ('lon_rho','lon'),('lat_rho','lat'),('mask_rho','mask'),('h','depth'):
    print 'filling %s with %s' % (v,v0)
    nc.vars[v][:]=netcdf.use(grd,v0,xi_rho=XI,eta_rho=ETA)

  if nomask:
    print 'NO MASK !!!'
    nc.vars['mask'][:]=1

  if gshhsMask:
    try:
     mask=np.load('mask_gshhs.npy')
    except:
      mask=1+0*netcdf.use(nc0,'mask_rho',xi_rho=XI,eta_rho=ETA)
      mask=mask.astype('bool')
      x=netcdf.use(grd,'lon_rho',xi_rho=XI,eta_rho=ETA)
      y=netcdf.use(grd,'lat_rho',xi_rho=XI,eta_rho=ETA)

      from okean import gshhs
      axis=x.min(),x.max(),y.min(),y.max()
      g=gshhs.gshhs(axis, resolution='h',area_thresh=0., max_level=2,clip=True)
      for lon, lat, level in zip(g.lon, g.lat, g.level):
        if level == 1: # land
          print 'mask ',lon.shape
          i=calc.inpolygon(x,y,lon,lat)
          mask=mask & ~i

      mask.dump('mask_gshhs.npy')


    nc.vars['mask'][:]=mask


  x=x0[j1:j2:deta,i1:i2:dxi]
  y=y0[j1:j2:deta,i1:i2:dxi]
  ang=ang[j1:j2:deta,i1:i2:dxi]

  n=-1
  for it in range(len(time)):
    if not dates is False:
      d0,d1=dates
      if time[it]<d0 or time[it]>=d1: continue

    n+=1
    U=np.zeros((eta0,xi0),'f')
    V=np.zeros((eta0,xi0),'f')

    nc.vars['time'][n]=netcdf.date2num(time[it],tunits)

    # for roms agrif:
    #u=netcdf.use(nc0,'u',time=it,s_rho=-1)
    #v=netcdf.use(nc0,'v',time=it,s_rho=-1)
    u=netcdf.use(nc0,'u',ocean_time=it,s_rho=-1)
    v=netcdf.use(nc0,'v',ocean_time=it,s_rho=-1)

    # mask extrap:
    print 'mask extrap...'

    u=calc.mask_extrap(x0,y0,np.ma.masked_where(u==0,u))
    v=calc.mask_extrap(x0,y0,np.ma.masked_where(v==0,v))

    U[:,1:-1]=0.5*(u[:,:-1]+u[:,1:])
    U[:,0]=u[:,0]
    U[:,-1]=u[:,-1]

    V[1:-1,:]=0.5*(v[:-1.:]+v[1:,:])
    V[0,:]=v[0,:]
    V[-1,:]=v[-1,:]

    U=U[j1:j2,i1:i2]
    V=V[j1:j2,i1:i2]
  
    U=U[j1:j2:deta,i1:i2:dxi]
    V=V[j1:j2:deta,i1:i2:dxi]

    # rotate uv:
    print 'rotating ...'
    U,V=calc.rot2d(U,V,-ang)

    print 'filling uv', n, time[it]
    nc.vars['u'][n,...]=U
    nc.vars['v'][n,...]=V

  nc.close()
  nc0.close()
示例#13
0
文件: roms.py 项目: AndreLobato/okean
 def ingrid(self,x,y):#,retInds=False):
   '''in polygon of region border'''
   xb,yb=self.border()
   return calc.inpolygon(x,y,xb,yb)