if band > 1 and band < bands and np.sum((band_data == 2) & (prev_band == 0) & (next_band == 0)) > 0: selected_bands.append(band)解释这段的代码
时间: 2024-05-26 08:12:24 浏览: 47
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if band > 1 and band < bands and np.sum((band_data == 2) & (prev_band == 0) & (next_band == 0)) > 0: selected_bands.append(band)
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# # 全区预测 block_size = 500 # 设置块大小 raster = path + '/bands/ccrop21.tif' output_fname = path + 'predict/RFpredict2021.tif' # 打开 TIFF 文件 raster_dataset = gdal.Open(raster, gdal.GA_ReadOnly) geo_transform = raster_dataset.GetGeoTransform() proj = raster_dataset.GetProjectionRef() # 获取 TIFF 文件的行列数和波段数 rows = raster_dataset.RasterYSize cols = raster_dataset.RasterXSize n_bands = raster_dataset.RasterCount # 创建输出文件 driver = gdal.GetDriverByName('GTiff') out_dataset = driver.Create(output_fname, cols, rows, 1, gdal.GDT_Float32) out_dataset.SetGeoTransform(geo_transform) out_dataset.SetProjection(proj) # 逐块处理数据 for i in range(0, rows, block_size): for j in range(0, cols, block_size): # 计算当前块的行列范围 i_end = min(i + block_size, rows) j_end = min(j + block_size, cols) i_size = i_end - i j_size = j_end - j # 逐块读取数据 bands_data = [] for b in range(1, n_bands + 1): band = raster_dataset.GetRasterBand(b) data = band.ReadAsArray(j, i, j_size, i_size) bands_data.append(data) # 将数据堆叠为一个三维数组 bands_data = np.dstack(bands_data) # 将数据重塑为二维数组 n_samples = i_size * j_size flat_pixels = bands_data.reshape((n_samples, n_bands)) # 预测并将结果写入输出文件 result = RFmodel.predict(flat_pixels) ypredict = result.reshape((i_size, j_size)) out_dataset.GetRasterBand(1).WriteArray(ypredict, j, i) out_dataset.FlushCache() del out_dataset
这段代码是使用随机森林模型对一个TIFF文件进行预测,并将结果写入另一个TIFF文件中。具体来说,它首先打开一个TIFF文件,并获取其行列数和波段数,然后创建一个输出TIFF文件,设置其地理变换和投影信息,并逐块读取数据。对于每个块,它先将各波段数据堆叠为一个三维数组,然后将其重塑为一个二维数组,以便于输入随机森林模型进行预测。最后,将预测结果写入输出文件中。
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