def test_compute_residuals(control_network, sensors):
# sensor.groundToImage.side_effect = [csmapi.ImageCoord(-0.1, 7.8), csmapi.ImageCoord(0.7, 6.6), csmapi.ImageCoord(1.5, 5.4),
# csmapi.ImageCoord(2.3, 4.2), csmapi.ImageCoord(3.1, 4.9), csmapi.ImageCoord(5.8, 3.7),
# csmapi.ImageCoord(6.6, 2.5), csmapi.ImageCoord(7.4, 1.3), csmapi.ImageCoord(8.2, 0.1)]
sensors['a'].groundToImage.side_effect = [
csmapi.ImageCoord(-0.1, 7.8),
csmapi.ImageCoord(5.8, 3.7)
]
sensors['b'].groundToImage.side_effect = [
csmapi.ImageCoord(0.7, 6.6),
csmapi.ImageCoord(3.1, 4.9),
csmapi.ImageCoord(6.6, 2.5)
]
sensors['c'].groundToImage.side_effect = [
csmapi.ImageCoord(1.5, 5.4),
csmapi.ImageCoord(7.4, 1.3)
]
sensors['d'].groundToImage.side_effect = [
csmapi.ImageCoord(2.3, 4.2),
csmapi.ImageCoord(8.2, 0.1)
]
V = bundle.compute_residuals(control_network, sensors)
assert V.shape == (18, )
np.testing.assert_allclose(V, [
0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, -0.9, -0.8, -0.7, -0.6,
-0.5, -0.4, -0.3, -0.2, -0.1
])
def _(dem, image_pt, camera, max_its=20, tolerance=0.001):
if not isinstance(image_pt, csmapi.ImageCoord):
# Support a call where image_pt is in the form (x,y)
image_pt = csmapi.ImageCoord(*image_pt)
intersection = generate_ground_point(0.0, image_pt, camera)
iterations = 0
semi_major, semi_minor = get_radii(camera)
ecef = pyproj.Proj(proj='geocent', a=semi_major, b=semi_minor)
lla = pyproj.Proj(proj='latlon', a=semi_major, b=semi_minor)
while iterations != max_its:
lon, lat, alt = pyproj.transform(ecef, lla, intersection.x,
intersection.y, intersection.z)
px, py = dem.latlon_to_pixel(lat, lon)
height = dem.read_array(1, [px, py, 1, 1])[0][0]
next_intersection = camera.imageToGround(image_pt, float(height))
dist = max(abs(intersection.x - next_intersection.x),
abs(intersection.y - next_intersection.y),
abs(intersection.z - next_intersection.z))
intersection = next_intersection
iterations += 1
if dist < tolerance:
break
return intersection
def generate_ground_point(dem, image_pt, camera):
'''
Generates a longitude, latitude, and altitude coordinate for a given x, y
pixel coordinate
Parameters
----------
dem : float or object
Either a float that represents the height above the datum or a
GeoDataset object generated from Plio off of a Digital Elevation
Model (DEM)
image_pt : tuple
Pair of x, y coordinates in pixel space
camera : object
USGSCSM camera model object
max_its : int, optional
Maximum number of iterations to go through if the height does not
converge
tolerance : float, optional
Number of decimal places to solve to when solving for height
Returns
-------
: object
CSM EcefCoord containing the newly computed lon, lat, and alt values
corresponding to the original image_pt coordinates
'''
if not isinstance(image_pt, csmapi.ImageCoord):
# Support a call where image_pt is in the form (x,y)
image_pt = csmapi.ImageCoord(*image_pt)
return camera.imageToGround(image_pt, dem)
def generate_gcps(camera, nnodes=5, semi_major=3396190, semi_minor=3376200):
ecef = pyproj.Proj(proj='geocent', a=semi_major, b=semi_minor)
lla = pyproj.Proj(proj='latlon', a=semi_major, b=semi_minor)
isize = camera.getImageSize()
isize = [isize.samp, isize.line]
x = np.linspace(0, isize[1], 10)
y = np.linspace(0, isize[0], 10)
boundary = [(i,0.) for i in x] + [(isize[1], i) for i in y[1:]] +\
[(i, isize[0]) for i in x[::-1][1:]] + [(0.,i) for i in y[::-1][1:]]
gnds = np.empty((len(boundary), 3))
for i, b in enumerate(boundary):
gnd = camera.imageToGround(csmapi.ImageCoord(*b), 0)
gnds[i] = [gnd.x, gnd.y, gnd.z]
lons, lats, alts = pyproj.transform(ecef, lla, gnds[:, 0], gnds[:, 1],
gnds[:, 2])
lla = np.vstack((lons, lats, alts)).T
tr = zip(boundary, lla)
gcps = []
for i, t in enumerate(tr):
l = '<GCP Id="{}" Info="{}" Pixel="{}" Line="{}" X="{}" Y="{}" Z="{}" />'.format(
i, i, t[0][1], t[0][0], t[1][0], t[1][1], t[1][2])
gcps.append(l)
return gcps
def generate_latlon_boundary(camera,
nnodes=5,
semi_major=3396190,
semi_minor=3376200,
n_points=10):
'''
Generates a latlon bounding box given a camera model
Parameters
----------
camera : object
csmapi generated camera model
nnodes : int
Not sure
semi_major : int
Semimajor axis of the target body
semi_minor : int
Semiminor axis of the target body
n_points : int
Number of points to generate between the corners of the bounding
box per side.
Returns
-------
lons : list
List of longitude values
lats : list
List of latitude values
alts : list
List of altitude values
'''
isize = camera.getImageSize()
isize = (isize.line, isize.samp)
boundary = generate_boundary(isize, nnodes=nnodes, n_points=n_points)
ecef = pyproj.Proj(proj='geocent', a=semi_major, b=semi_minor)
lla = pyproj.Proj(proj='latlon', a=semi_major, b=semi_minor)
gnds = np.empty((len(boundary), 3))
for i, b in enumerate(boundary):
# Could be potential errors or warnings from imageToGround
try:
gnd = camera.imageToGround(csmapi.ImageCoord(*b), 0)
except:
pass
gnds[i] = [gnd.x, gnd.y, gnd.z]
lons, lats, alts = pyproj.transform(ecef, lla, gnds[:, 0], gnds[:, 1],
gnds[:, 2])
return lons, lats, alts
def triangulate_ground_pt(cameras, image_pts):
"""
Given a set of cameras and image points, find the ground point closest
to the image rays for the image points.
This function minimizes the sum of the squared distances from the ground
point to the image rays.
Parameters
----------
cameras : list
A list of CSM compliant sensor model objects
image_pts : list
A list of x, y image point tuples
Returns
-------
: tuple
The ground point as an (x, y, z) tuple
"""
if len(cameras) != len(image_pts):
raise ValueError(
"Lengths of cameras ({}) and image_pts ({}) must be the "
"same".format(len(cameras), len(image_pts)))
M = np.zeros((3, 3))
b = np.zeros(3)
unit_x = np.array([1, 0, 0])
unit_y = np.array([0, 1, 0])
unit_z = np.array([0, 0, 1])
for camera, image_pt in zip(cameras, image_pts):
if not isinstance(image_pt, csmapi.ImageCoord):
image_pt = csmapi.ImageCoord(*image_pt)
locus = camera.imageToRemoteImagingLocus(image_pt)
look = np.array(
[locus.direction.x, locus.direction.y, locus.direction.z])
pos = np.array([locus.point.x, locus.point.y, locus.point.z])
look_squared = np.dot(look, look)
M[0] += look[0] * look - look_squared * unit_x
M[1] += look[1] * look - look_squared * unit_y
M[2] += look[2] * look - look_squared * unit_z
b += np.dot(pos, look) * look - look_squared * pos
return tuple(np.dot(np.linalg.inv(M), b))
def generate_latlon_footprint(camera,
nnodes=5,
semi_major=3396190,
semi_minor=3376200):
ecef = pyproj.Proj(proj='geocent', a=semi_major, b=semi_minor)
lla = pyproj.Proj(proj='latlon', a=semi_major, b=semi_minor)
isize = camera.getImageSize()
isize = [isize.samp, isize.line]
x = np.linspace(0, isize[1], 10)
y = np.linspace(0, isize[0], 10)
multipoly = ogr.Geometry(ogr.wkbMultiPolygon)
boundary = [(i,0.) for i in x] + [(isize[1], i) for i in y[1:]] +\
[(i, isize[0]) for i in x[::-1][1:]] + [(0.,i) for i in y[::-1][1:]]
ring = ogr.Geometry(ogr.wkbLinearRing)
for i in boundary:
gnd = camera.imageToGround(csmapi.ImageCoord(*i), 0)
lons, lats, alts = pyproj.transform(ecef, lla, gnd.x, gnd.y, gnd.z)
ring.AddPoint(lons, lats)
poly = ogr.Geometry(ogr.wkbPolygon)
poly.AddGeometry(ring)
multipoly.AddGeometry(poly)
return multipoly
def func(row, args):
camera = args[0]
imagecoord = csmapi.ImageCoord(float(row[1]), float(row[0]))
# An elevation at the ellipsoid is plenty accurate for this work
gnd = getattr(camera, 'imageToGround')(imagecoord, 0)
return [gnd.x, gnd.y, gnd.z]
