Created
April 25, 2016 20:25
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import os | |
import rasterio | |
%matplotlib inline | |
import matplotlib.pyplot as plt | |
import numpy as np | |
def render_array(arr1, arr2=None, width=7, height=7, cmap=plt.cm.jet): | |
if arr2 is None: | |
fig, ax = plt.subplots(1, figsize=(width,height), facecolor='white') | |
ax.axis('off') | |
plt.imshow(arr1, cmap=cmap) | |
plt.show() | |
else: | |
fig, (ax1, ax2) = plt.subplots(nrows=1, ncols=2) | |
fig.set_size_inches(width, height) | |
ax1.imshow(arr2) | |
ax1.axis('off') | |
ax2.imshow(arr1) | |
ax2.axis('off') | |
def xy_from_coords(x_coord, y_coord, ul, lr, width, height): | |
x0, x1 = ul[0], lr[0] | |
y0, y1 = ul[1], lr[1] | |
x_diff = x1 - x0 | |
y_diff = y0 - y1 | |
xpx = ((x1 - x_coord) / x_diff) * width | |
if y0 - y_coord == 0.0: | |
ypx = height | |
elif y_diff != 0: | |
ypx = (y0 - y_coord) / y_diff * height | |
else: | |
ypx = 0 | |
return int(abs(xpx-width)), int(ypx) | |
def clip_image(bbox, filepath): | |
with rasterio.drivers(): | |
with rasterio.open(filepath) as src: | |
bounds = src.bounds | |
ul, lr = [bounds.left, bounds.top], [bounds.right, bounds.bottom] | |
r, g, b, a = src.read() | |
np_img = np.dstack((r, g, b, a)) | |
ul_px = xy_from_coords(bbox[0], bbox[3], ul, lr, src.width, src.height) | |
lr_px = xy_from_coords(bbox[2], bbox[1], ul, lr, src.width, src.height) | |
return np_img[ul_px[0]:lr_px[0], ul_px[1]:lr_px[1], :] | |
def clip_directory(data_dir, bbox): | |
files = os.listdir(data_dir) | |
return [clip_image(bbox, os.path.join( data_dir, f )) for f in files] | |
bbox = [483275.7009112152, 3610083.6489744713, 486785.39847831125, 3613762.760762966] | |
data_dir = './san_diego_4_11_16/visual/' | |
clipped = clip_directory(data_dir, bbox) | |
fig, ax = plt.subplots(1, figsize=(5,5), facecolor='white') | |
ax.axis('off') | |
imgplot = plt.imshow(clipped[-1]) | |
plt.show() |
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