Question

我使用OpenCv库在python中编程。

我试图使用opencv删除阴影，所以之后我想计算NDVI（Arcpy库）。因此，如果我从原始图像计算NDVI，它工作正常，但如果我想在消除阴影后从结果计算NDVI，我得到了这个错误：

Traceback (most recent call last):

  File "C:/Python27/sombras_ndvi.py", line 36, in <module>

    NIR = arcpy.sa.Raster(sumada3+ '\Band_1')

TypeError: unsupported operand type(s) for +: 'numpy.ndarray' and 'str'

完整的代码是：

#I create a workspace to calculate NDVI..

arcpy.CheckOutExtension("spatial")

env.workspace = r'C:\python27\archivos'

#the first step is apply some filters to finally delete shades.

img = cv2.imread('C:\python27\Archivos\image02.jpg',0)

orig = cv2.imread('C:\python27\Archivos\image02.jpg')


thresh = 45
maxValue = 255

blur = cv2.blur(img, (15,15))

medianblur = cv2.medianBlur(blur,11)

th, dst = cv2.threshold(blur, thresh, maxValue, cv2.THRESH_BINARY_INV)


dst2_3channel= cv2.cvtColor(dst,cv2.COLOR_GRAY2BGR) 

sumada3 = cv2.add(dst2_3channel,orig)

#NOW I TRY TO CALCULATE NDVI


NIR = arcpy.sa.Raster(sumada3+ '\Band_1')

red = arcpy.sa.Raster(sumada3+ '\Band_2')

#NDVI = (NIR-red)/(NIR+red)

num = arcpy.sa.Float(NIR-red)

denom = arcpy.sa.Float(NIR+red)

NDVI = arcpy.sa.Divide(num, denom)

ndvi_out = ('NDVI_sombras.jpg')

NDVI.save(ndvi_out)

Answer 1

arcpy.sa.Raster创建一个栅格对象。但是，它需要现有的栅格数据集作为输入。它不能接受numpy数组作为输入;适当的工具是arcpy.NumPyArrayToRaster。

TypeError：+：＆＃39; numpy.ndarray＆＃39;不支持的操作数类型和＆＃39; str＆＃39;

1 个答案: