smrf.ipw package

smrf.ipw.ipw module

Created on Apr 7, 2015

Adapted from Roger Lew (rogerlew.gmail.com)isnobal.py

@author: Scott Havens

class smrf.ipw.ipw.Band(nlines, nsamps)

Bases: object

Represents a raster band of geospatial data

class smrf.ipw.ipw.IPW(fname=None, epsg=32611)

Bases: object

Represents a IPW file container

add_geo_hdr(coordinates, d, units, csys, band='all')

Add geo header information to the band

Parameters:

• coordinates – [u, v] The coordinates of image line 0 and sample 0 in csys are u and v, respectively.
• d – [dx, dy] The distances between adjacent image lines and samples in csys are du and dv, respectively.
• units – u, v, du, and dv are specified in units (e.g., “meters”, “km”).
• csys – The geodetic coordinate system identifier is csys (e.g., “UTM”, “Lambert”). See the manual for mkproj for a list of standard names for coordinate systems.
• band (optional) – [0,1,4,…] The “geo” header will be applied only to the specified bands (default: all bands).

if ‘all’ for band number then do all, or a subset from array?

# geo self.bline = None self.bsamp = None self.dline = None self.dsamp = None self.geounits = None self.coord_sys_ID = None self.geotransform = None

mkgeoh -o coord,coord -d incr,incr -u units -c csys [-b band,…] [-f] [image]

new_band(data)

Create a new band in IPW that is placed at the end if bands already exist.

read(fname)

Read the IPW file into the various bands Turns the data into a numpy array of float32

read3(fname)

Read the IPW file into the various bands Turns the data into a numpy array of float32 This is meant for Python3 which has different ways of ready binary files than Python2

write(fileName, nbits=8)

Write the IPW data to file

Parameters:

• - file to write to (fileName) –
• - number of bits for each band default=8 (nbits) –

smrf.ipw.ipw.int_match(val)

(Devel team is unsure if this is the case. This description is our interpretation of pre-existing code that was re-written to be up-to-date with deprecations. We are confident it behaves the same as it did before.)

IPW writes in the header a integer represented as a float in python without the decimal. So sometimes we have to proactively check and pass a int to the header function.

e.g. float_min == 1.00, IPW writes 1 :param val: an potential int represented as float.

Returns:

the val is casted as int if val is equivalent to itself casted

as an int

Return type:result

smrf.ipw.ipw.map_fn(x, float_min, float_max, int_min, int_max)

smrf.ipw.ipw.readline3(fid)

Read a line from a binary file in Python3 and decode

Module contents