def parse_ozi_map(map_file_name, cutline_type = None):
"""cutline_type can be 'projected', 'latlon' or None"""
ozi_map = ozi_reader.read_map(open(map_file_name).readlines())
ozi_dir = os.path.split(os.path.abspath(map_file_name))[0]
image_name = find_file_ci(ozi_dir, ozi_map.file_name)
if not image_name:
raise Exception('File "%s" not found.' % image_name)
map_srs = get_srs_as_proj4(ozi_map.datum, ozi_map.projection)
map_ll_srs = get_ozi_ll_srs(ozi_map.datum, ozi_map.projection)
gcps = convert_ozi_gcps(ozi_map.gcps, map_srs, map_ll_srs)
geotransform = gcps_to_geotransform(gcps)
units_per_pixel = get_resolution(geotransform)
if cutline_type and len(ozi_map.cutline) > 2:
cutline_projected = {'projected': True, 'latlon': False}[cutline_type]
if cutline_projected:
cutline_points = convert_cutline(ozi_map.cutline, map_srs, map_ll_srs)
cutline_srs = map_srs
cutline_units_per_pixel = units_per_pixel
else:
cutline_points = convert_cutline(ozi_map.cutline)
cutline_srs = map_ll_srs
cutline_units_per_pixel = get_resolution(geotransform, map_srs, map_ll_srs)
cutline = AttrDict(points = cutline_points, srs = cutline_srs, units_per_pixel = cutline_units_per_pixel)
else:
cutline = None
result = AttrDict()
result.image_name = image_name
result.map_srs = map_srs
result.gcps = gcps
result.units_per_pixel = units_per_pixel
result.cutline = cutline
result.geotransform = geotransform
result.datum = datum_names_map[ozi_map.datum]
result.projection = ozi_map.projection
result.inv_geotransform = gcps_to_geotransform([AttrDict(pixel = g.ref, ref = g.pixel) for g in gcps ])
return result
def read_ozi_map(data):
if hasattr(data, 'read'):
data = data.read()
lines = data.splitlines()
lines = [l.strip(' \n\r\x09') for l in lines]
if not lines:
raise OziFormatError('Document empty.')
ozi_map = AttrDict()
try:
with OziFormatError('line 1'):
validate_string_start(lines[0], 'OziExplorer Map Data File Version 2.')
ozi_map.title = lines[1].decode('cp1251')
ozi_map.file_name = lines[2].decode('cp1251').split('\\')[-1]
with OziFormatError('line 5, datum name'):
ozi_map.datum = validate_notempty(fields(lines[4], 1)[0])
proj_params = fields(lines[8], 2)
with OziFormatError('line 9'):
validate_value(proj_params[0], 'Map Projection')
ozi_map.projection = AttrDict()
with OziFormatError('line 9, projection name'):
ozi_map.projection.name = validate_notempty(proj_params[1])
proj_params = fields(lines[39], 10)
with OziFormatError('line 40'):
validate_value(proj_params[0], 'Projection Setup')
if proj_params[1]:
ozi_map.projection.lat_origin = validate_float(proj_params[1])
if proj_params[2]:
ozi_map.projection.lon_origin = validate_float(proj_params[2])
if proj_params[3]:
ozi_map.projection.k_factor = validate_float(proj_params[3])
if proj_params[4]:
ozi_map.projection.false_easting = validate_float(proj_params[4])
if proj_params[5]:
ozi_map.projection.false_northing = validate_float(proj_params[5])
if proj_params[6]:
ozi_map.projection.lat1 = validate_float(proj_params[6])
if proj_params[7]:
ozi_map.projection.lat2 = validate_float(proj_params[7])
if proj_params[8]:
ozi_map.projection.height = validate_float(proj_params[8])
ozi_map.gcps = []
for i in xrange(1, 31):
ozi_gcp = fields(lines[i + 8], 17)
with OziFormatError('line %d' % (i + 9)):
validate_value(ozi_gcp[0], 'Point%02d' % i)
validate_value(ozi_gcp[1], 'xy')
validate_value(ozi_gcp[5], 'deg')
validate_value(ozi_gcp[12], 'grid')
validate_values(ozi_gcp[4], ['in', 'ex'])
if ozi_gcp[4] == 'in' and ozi_gcp[2] and ozi_gcp[3]:
gcp = AttrDict(pixel=AttrDict(), ref=AttrDict())
gcp.pixel.x = validate_number(ozi_gcp[2])
gcp.pixel.y = validate_number(ozi_gcp[3])
if ozi_gcp[6] and ozi_gcp[7] and ozi_gcp[9] and ozi_gcp[10]:
validate_values(ozi_gcp[8], ['S', 'N'])
validate_values(ozi_gcp[11], ['W', 'E'])
gcp.type = 'latlon'
gcp.ref.x = validate_number(ozi_gcp[9]) + validate_float(ozi_gcp[10]) / 60
gcp.ref.y = validate_number(ozi_gcp[6]) + validate_float(ozi_gcp[7]) / 60
if ozi_gcp[11] == 'W':
gcp.ref.x *= -1
if ozi_gcp[8] == 'S':
gcp.ref.y *= -1
elif ozi_gcp[14] and ozi_gcp[15]:
validate_values(ozi_gcp[16], ['N', 'S'])
gcp.type = 'proj'
gcp.ref.x = validate_float(ozi_gcp[14])
gcp.ref.y = validate_float(ozi_gcp[15])
if ozi_gcp[16] == 'S':
gcp.ref.y *= -1
if ozi_gcp[13]:
gcp.zone = validate_number(ozi_gcp[13])
else:
raise OziFormatError('incomplete gcp definition')
ozi_map.gcps.append(gcp)
ozi_map.cutline = []
ozi_map.cutline_pixels = []
for line in lines[40:]:
point = fields(line, 4)
if point[0] == 'MMPLL':
lat = validate_float(point[3])
lon = validate_float(point[2])
ozi_map.cutline.append((lon, lat))
elif point[0] == 'MMPXY':
x = validate_number(point[2])
y = validate_number(point[3])
ozi_map.cutline_pixels.append((x, y))
except IndexError:
raise OziFormatError('Document too short.')
return ozi_map
