class SpiralIterator: def init(self, source, x=810, y=500, length=None): self.source = source self.row = np.shape(self.source)[0]#第一个元素是行数 self.col = np.shape(self.source)[1]#第二个元素是列数 if length: self.length = min(length, np.size(self.source)) else: self.length = np.size(self.source) if x: self.x = x else: self.x = self.row // 2 if y: self.y = y else: self.y = self.col // 2 self.i = self.x self.j = self.y self.iteSize = 0 geo_transform = dsm_data.GetGeoTransform() self.x_origin = geo_transform[0] self.y_origin = geo_transform[3] self.pixel_width = geo_transform[1] self.pixel_height = geo_transform[5] def hasNext(self): return self.iteSize < self.length # 不能取更多值了 def get(self): if self.hasNext(): # 还能再取一个值 # 先记录当前坐标的值 —— 准备返回 i = self.i j = self.j val = self.source[i][j] # 计算下一个值的坐标 relI = self.i - self.x # 相对坐标 relJ = self.j - self.y # 相对坐标 if relJ > 0 and abs(relI) < relJ: self.i -= 1 # 上 elif relI < 0 and relJ > relI: self.j -= 1 # 左 elif relJ < 0 and abs(relJ) > relI: self.i += 1 # 下 elif relI >= 0 and relI >= relJ: self.j += 1 # 右 #判断索引是否在矩阵内 x = self.x_origin + (j + 0.5) * self.pixel_width y = self.y_origin + (i + 0.5) * self.pixel_height z = val self.iteSize += 1 return x, y, z dsm_path = 'C:\sanwei\jianmo\Productions\Production_2\Production_2_DSM_part_2_2.tif' dsm_data = gdal.Open(dsm_path) dsm_array = dsm_data.ReadAsArray() spiral_iterator = SpiralIterator(dsm_array,x=810,y=500) while spiral_iterator.hasNext(): x, y, z = spiral_iterator.get() print(f'Value at ({x},{y}):{z}')这段代码怎么改可以用共线方程将地面点(X,Y,Z)反算其在原始航片中的像素值行列号( r,c),当原始航片该位置像素值为 0 值,修改其像素值为 255,当原始航片该( r,c) 位置像素值为 255 时,说明此点已被占用,则对地面点(X,Y,Z)标记此点位被遮蔽并打印出遮蔽点

你可以将代码中的print语句改为判断像素值是否为0或255，如果为0则将像素值修改为255，如果为255则打印出遮蔽点。具体修改如下：

dsm_path = 'C:\sanwei\jianmo\Productions\Production_2\Production_2_DSM_part_2_2.tif'
dsm_data = gdal.Open(dsm_path)
dsm_array = dsm_data.ReadAsArray()
spiral_iterator = SpiralIterator(dsm_array,x=810,y=500)
while spiral_iterator.hasNext():
    x, y, z = spiral_iterator.get()
    # 计算行列号
    c = int((x - spiral_iterator.x_origin) / spiral_iterator.pixel_width)
    r = int((y - spiral_iterator.y_origin) / spiral_iterator.pixel_height)
    if dsm_array[r][c] == 0:
        # 修改像素值为255
        dsm_array[r][c] = 255
    elif dsm_array[r][c] == 255:
        # 打印遮蔽点
        print(f'Shadow point at ({x},{y}):{z}')

注意，这段代码需要用到gdal库，需要先安装gdal库。