Application: gvSIG desktop » gvSIG scripting

#

# ============================================

#

#  Lector de los metadatos de GPS de las imagenes

#

execfile( script.getResource("../libs/import_utils.py").getAbsolutePath() )

import_from_jars("libs","com.drew.imaging.ImageMetadataReader")

class ImageGPSMetadata:

  def __init__(self,pathname=None):

    self.load(pathname)

  def load(self, pathname):

    self.__pathname = pathname

    self.__values = dict()

    if pathname != None:

      metadata = ImageMetadataReader.readMetadata(pathname)

      for directory in metadata.getDirectories():

        if directory.getName() == "GPS":

          for tag in directory.getTags():

            self.__values[tag.getTagName().strip()] = tag.getDescription().strip()

  def getLatitude(self, defaultValue=None):

    return self.__values.get("GPS Latitude",defaultValue)

  def getLatitudeRef(self, defaultValue=None):

    return self.__values.get("GPS Latitude Ref",defaultValue)

  def getLongitude(self, defaultValue=None):

    return self.__values.get("GPS Longitude",defaultValue)

  def getLongitudeRef(self, defaultValue=None):

    return self.__values.get("GPS Longitude Ref",defaultValue)

  def getAltitude(self, defaultValue=None):

    return self.__values.get("GPS Altitude",defaultValue)

  def getAltitudeRef(self, defaultValue=None):

    return self.__values.get("GPS Altitude Ref",defaultValue)

  def getDatum(self, defaultValue=None):

    return self.__values.get("GPS Map Datum",defaultValue)

  def getDate(self, defaultValue=None):

    return self.__values.get("GPS Date Stamp",defaultValue)

  def getTime(self, defaultValue=None):

    return self.__values.get("GPS Time-Stam",defaultValue)

  def hasPosition(self):

    if self.getLatitude() == None or self.getLatitudeRef() == None or self.getLongitude() == None or self.getLongitudeRef() == None:

      return False

    return True

  def getPoint(self):

    import re

    def getFloat(s):

      return float(s.replace(",","."))

    if not self.hasPosition():

      return None

    latitud_ref = self.getLatitudeRef().strip().lower()

    longitud_ref = self.getLongitudeRef().strip().lower()

    m = re.search("[ ]*([0-9,]+).* ([0-9,]+).* ([0-9,]+)", self.getLatitude())

    la = getFloat(m.group(1)) + getFloat(m.group(2))/60 + getFloat(m.group(3))/3600 

    if latitud_ref == "S":

      la = -la

    m = re.search("[ ]*([0-9,]+).* ([0-9,]+).* ([0-9,]+)", self.getLongitude())

    lo = getFloat(m.group(1)) + getFloat(m.group(2))/60 + getFloat(m.group(3))/3600 

    if longitud_ref in ("O", "W"):

      lo = -lo

    from org.gvsig.fmap.geom import GeometryLocator

    from org.gvsig.fmap.geom import Geometry

    geomManager = GeometryLocator.getGeometryManager()

    point = geomManager.createPoint(lo,la, Geometry.SUBTYPES.GEOM2D)

    return point