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##############################################################################
# Copyright by The HDF Group. #
# All rights reserved. #
# #
# This file is part of the HDF Compass Viewer. The full HDF Compass #
# copyright notice, including terms governing use, modification, and #
# terms governing use, modification, and redistribution, is contained in #
# the file COPYING, which can be found at the root of the source code #
# distribution tree. If you do not have access to this file, you may #
# request a copy from help@hdfgroup.org. #
##############################################################################
"""
HDF Compass "pilot" plugin for viewing ASCII Grid Data.
Subclasses consist of a Container and an Array, representing
directories and the ASCII grid data respectively.
See: http://en.wikipedia.org/wiki/Esri_grid for a description of
the file format
"""
import os.path as op
import linecache
import numpy as np
import logging
logger = logging.getLogger(__name__)
from hdf_compass import compass_model
from hdf_compass.utils import url2path
class AsciiGrid(compass_model.Store):
""" A "data store" represented by an ascii grid file. """
@staticmethod
def plugin_name():
return "Ascii Grid"
@staticmethod
def plugin_description():
return "A plugin used to browse Ascii Grid."
file_extensions = {'ASC File': ['*.asc']}
def __contains__(self, key):
if key == '/':
return True
return False
@property
def url(self):
return self._url
@property
def display_name(self):
return op.basename(self._url)
@property
def root(self):
return self['/']
@property
def valid(self):
return self._valid
@staticmethod
def can_handle(url):
if not url.startswith('file://'):
logger.debug("able to handle %s? no, not starting with file://" % url)
return False
if not url.endswith('.asc'):
logger.debug("able to handle %s? no, missing .asc extension" % url)
return False
first_line = open(url2path(url)).readline()
if first_line.split()[0].upper() != "NCOLS":
logger.debug("able to handle %s? no, invalid first line" % url)
return False
logger.debug("able to handle %s? yes" % url)
return True
def __init__(self, url):
if not self.can_handle(url):
raise ValueError(url)
self._url = url
self._valid = True
def close(self):
self._valid = False
def get_parent(self, key):
return None
def getFilePath(self):
return url2path(self._url)
class ASCFile(compass_model.Array):
""" Represents a .asc grid file. """
class_kind = "ASCII Grid File"
@staticmethod
def can_handle(store, key):
if key == '/':
return True
return False
def __init__(self, store, key):
self._store = store
self._key = key
file_path = self._store.getFilePath()
self._nrows = int(linecache.getline(file_path, 1).lstrip("ncols"))
self._ncols = int(linecache.getline(file_path, 2).lstrip("nrows"))
self._data = None
@property
def key(self):
return self._key
@property
def store(self):
return self._store
@property
def display_name(self):
return self._store.display_name
@property
def description(self):
return 'File "%s", size %d bytes' % (self.display_name, op.getsize(self.key))
@property
def shape(self):
return self._nrows, self._ncols
@property
def dtype(self):
return np.dtype('float')
def __getitem__(self, args):
if self._data is None:
self._data = np.loadtxt(self._store.getFilePath(), skiprows=6, unpack=True)
return self._data[args]
class Attributes(compass_model.KeyValue):
class_kind = "Attributes of ASC Grid File"
@staticmethod
def can_handle(store, key):
if key == '/':
return True
return False
def __init__(self, store, key):
self._store = store
self._key = key
file_path = self._store.getFilePath()
self.data = {'NODATA Value': float(linecache.getline(file_path, 6).lstrip("NODATA_value")),
'cellsize': float(linecache.getline(file_path, 5).lstrip("cellsize")),
'yllcorner': float(linecache.getline(file_path, 4).lstrip("yllcorner")),
'xllcorner': float(linecache.getline(file_path, 3).lstrip("xllcorner"))}
@property
def key(self):
return self._key
@property
def store(self):
return self._store
@property
def display_name(self):
return self.key
@property
def description(self):
return self.display_name
def close(self):
self._valid = False
@property
def keys(self):
return self.data.keys()
def __getitem__(self, args):
return self.data[args]
AsciiGrid.push(Attributes) # attribute data
AsciiGrid.push(ASCFile) # array
compass_model.push(AsciiGrid)
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