trafo_Trafo.py
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title = "Coordinate Transformation"
tip = "regrids a map of projection and coordinate system into a different one"
onein = True
import numpy as np
from kapteyn import wcs
from kapteyn.interpolation import map_coordinates
from nodmath import map_interpolate
from guidata.qt.QtGui import QMessageBox
from guidata.dataset.datatypes import DataSet
from guidata.dataset.dataitems import (IntItem, StringItem, ChoiceItem, FloatItem, BoolItem)
from guiqwt.config import _
def nint(x):
if x > 0: return int(x+0.5)
else: return int(x-0.5)
class NOD3_App:
def __init__(self, parent):
self.parent = parent
self.parent.activateWindow()
def compute_app(self, **args):
class FuncParam(DataSet):
system = ChoiceItem("System", (("Equatorial J2000", "Equatorial J2000"),
("Equatorial B1950", "Equatorial B1950"),
("Galactic", "Galactic")))
#proj = ChoiceItem("Projection", (("CAR", "CAR"), (("DES", "DES")), ("ARC", "ARC"),
proj = ChoiceItem("Projection", (("CAR", "CAR"), #("ARC", "ARC"),
("SIN", "SIN"),
("TAN", "TAN"), ("NCP", "NCP"), ("SFL", "SFL"),
("AIT", "AIT")))
#zero = BoolItem("Refere to (0, 0)", default=False)
angle = FloatItem("RotAngle", default=0.0, min=-180.0, max=180.0)
size = ChoiceItem("MapSize", (("same size", "same size"), ("automatic", "automatic"),
("user defined", "user defined")), default = "same size")
dremove = BoolItem("Remove dummy cols/rows", default=True)
name = title.replace(" ", "")
if args == {}:
param = FuncParam(_(title), "Your choise:")
else:
param = self.parent.ScriptParameter(name, args)
param.zero = False
self.parent.compute_11(name, lambda m, p: self.function(m, p), param, onein)
def Error(self, msg):
QMessageBox.critical(self.parent.parent(), title,
_(u"Error:")+"\n%s" % str(msg))
def setRefPoint(self, header):
# set ref point to map center
proj1 = wcs.Projection(header) # source projection
Naxis1, Naxis2 = header['NAXIS1'], header['NAXIS2']
newvals = proj1.toworld(((header['NAXIS1']+1)/2.0, (header['NAXIS2']+1)/2.0))
header['CRVAL1'], header['CRVAL2'] = newvals
header['CRPIX1'], header['CRPIX2'] = (Naxis1+1)/2.0, (Naxis2+1)/2.0
return header
def newEdges(self, header):
edges = []
proj1 = wcs.Projection(header) # source projection
lam, bet = proj1.toworld((0.0, 0.0))
edges.append(self.trans((lam, bet)))
lam, bet = proj1.toworld((0.0, header['NAXIS2']))
edges.append(self.trans((lam, bet)))
lam, bet = proj1.toworld((header['NAXIS1'], header['NAXIS2']))
edges.append(self.trans((lam, bet)))
lam, bet = proj1.toworld((header['NAXIS1'], 0.0))
edges.append(self.trans((lam, bet)))
return np.array(edges)
def check_projparm(self, header, proj):
for key in header.keys():
#if key.find("POLE") > 0 and proj == "CAR":
# header.pop(key)
if key.find("POLE") > 0 and proj == "CAR":
if key == "LONPOLE": header[key] = 0.0
if key == "LATPOLE": header[key] = 90.0
else:
if key == "LONPOLE": header[key] = 180.0
if key == "LATPOLE": header[key] = header['CRVAL2']
return header
def newHeaderAndSize(self, header, newproj, newcoord):
newheader = header.copy()
newheader['CTYPE1'], newheader['CTYPE2'] = newproj
newheader['CRVAL1'], newheader['CRVAL2'] = self.trans((header['CRVAL1'],header['CRVAL2']))
try:
edges = self.newEdges(header)
except:
self.Error("impossible determin new map size\nplease use 'same size' option")
return []
#proj2 = wcs.Projection(newheader)
#px, py = proj2.topixel(edges).T
#pxmin, pxmax = min(px), max(px)
#pymin, pymax = min(py), max(py)
#naxis1 = int((pxmax-pxmin+0.99)*1.5)
#naxis2 = int((pymax-pymin+0.99)*1.5)
#naxis1 = min(int((pxmax-pxmin+0.99)*1.5), 361.0/abs(header['CDELT1']))
#naxis2 = min(int((pymax-pymin+0.99)*1.5), 181.0/abs(header['CDELT2']))
if newcoord:
naxis1 = np.sqrt(header['NAXIS1']**2 + header['NAXIS2']**2)
naxis2 = np.sqrt(header['NAXIS1']**2 + header['NAXIS2']**2)
newheader['NAXIS1'], newheader['NAXIS2'] = naxis1, naxis2
newheader['CRPIX1'], newheader['CRPIX2'] = (naxis1+1)/2.0, (naxis2+1)/2.0
return newheader
def polarisation(self, maptype, coords):
n, rows, cols = np.shape(coords)
world = proj2.toworld((coords[0].ravel(), coords[1].ravel()))
def function(self, m, p):
naxis = m.header['NAXIS']
if p.system[0] == "E":
pl = "RA---"
pb = "DEC--"
else:
pl = "GLON-"
pb = "GLAT-"
pl += p.proj
pb += p.proj
header = m.header.copy()
header['NAXIS'] = 2
# for the moment no other choise
header['CTYPE1'] = header['CTYPE1'].replace("DES", "CAR")
header['CTYPE2'] = header['CTYPE2'].replace("DES", "CAR")
# usually not necessary
if header['CTYPE2'][:3] != pb[:3]:
newcoord = True
header = self.setRefPoint(header)
elif "CROTA2" in header and abs(header["CROTA2"] - p.angle) > 1.0:
newcoord = True
else:
newcoord = False
proj1 = wcs.Projection(header) # source projection
if p.system == "Galactic":
self.trans = wcs.Transformation(proj1.skysys, skyout=wcs.galactic)
elif p.system == "Equatorial J2000":
header['EPOCH'] = (2000.0, "Equinox of coordinate system.")
self.trans = wcs.Transformation(proj1.skysys, skyout=(wcs.equatorial, wcs.fk5, 'J2000.0'))
elif p.system == "Equatorial B1950":
header['EPOCH'] = (1950.0, "Equinox of coordinate system.")
self.trans = wcs.Transformation(proj1.skysys, skyout=(wcs.equatorial, wcs.fk4, 'B1950.0'))
if p.size == "automatic":
try:
newheader = self.newHeaderAndSize(header, (pl, pb), newcoord)
except:
self.Error("transfomation not possible,\ntry 'same size'")
return [], p
else:
newheader = header.copy()
newheader['CTYPE1'], newheader['CTYPE2'] = pl, pb
newheader['CRVAL1'], newheader['CRVAL2'] = self.trans((header['CRVAL1'],header['CRVAL2']))
if newheader == []:
return [], p
newheader['CROTA2'] = p.angle
newheader = self.check_projparm(newheader, p.proj)
proj2 = wcs.Projection(newheader) # destination projection
coords = wcs.coordmap(proj1, proj2)
m.header = newheader
# TODO:
if "xMAPTYPE" in m.header and m.header['MAPTYPE'] in ("U", "Q", "PA"):
m.data = self.polarisation(m.header['MAPTYPE'], coords)
m.data = map_interpolate(m.data, coords[1], coords[0])
if not p.size == "user defined":
if p.dremove:
m = self.parent.removeNANedges(m)
m.header['NAXIS'] = naxis
return m, p