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使用GeoAI包进行地理空间数据模型训练(六):Flip-n-Slide数据增强

使用GeoAI包进行地理空间数据模型训练(六):Flip-n-Slide数据增强

 使用GeoAI包进行Flip-n-Slide数据增强。

这次我们分享下使用GeoAI包进行Flip-n-Slide数据增强。

传统网格分块会丢失瓦片边界处的空间信息。Flip-n-Slide法可生成带多种增强效果的重叠瓦片,它具备以下特点:

  1. 保留瓦片边界间的空间关联;
  2. 借助旋转、翻转操作消除像素重复表达;
  3. 无需外接数据增强库,即可生成更多样化的训练数据;
该算法生成两类瓦片:
1. 标准重叠瓦片(步长减半):搭配旋转增强(原方向、90°、180°、270°)
2. 内部偏移瓦片(偏移至25%、75%位置):结合翻转与旋转增强(水平翻转、垂直翻转、90° 旋转+水平翻转、90° 旋转+垂直翻转)。
我们先导入必要的包。
import osimport geoaiimport numpy as npimport rasterioimport matplotlib.pyplot as pltfrom pathlib import Path

我们仍使用带建筑物轮廓的NAIP数据进行示例。

raster_url = (    "https://huggingface.co/datasets/giswqs/geospatial/resolve/main/naip_rgb_train.tif")vector_url = "https://huggingface.co/datasets/giswqs/geospatial/resolve/main/naip_train_buildings.geojson"sample_image = geoai.download_file(raster_url)sample_vector = geoai.download_file(vector_url)print(f"Downloaded image: {sample_image}")print(f"Downloaded labels: {sample_vector}")

在GeoAI包中,可以通过flipnslide_augmentation()函数实现Flip-n-Slide数据增强,该函数可直接处理维度为 (通道数,高度,宽度) 的NumPy数组,返回瓦片图像与一组增强索引。

# 将栅格读取为Numpy数组with rasterio.open(sample_image) as src:    image_data = src.read()print(f"Image shape: {image_data.shape}")print(f"Image dtype: {image_data.dtype}")# 进行Flip-n-Slide数据增强tiles, aug_indices = geoai.flipnslide_augmentation(image_data, tile_size=256)print(f"Number of tiles: {tiles.shape[0]}")print(f"Tile shape: {tiles.shape[1:]}")print(f"Augmentation types used: {sorted(set(aug_indices))}\n")# 对各类数据增强方式进行统计aug_names = {    0"Identity",    1"180° rotation",    2"90° rotation",    3"270° rotation",    4"Horizontal flip",    5"Vertical flip",    6"90° + H-flip",    7"90° + V-flip",}from collections import Countercounts = Counter(aug_indices)for idx in sorted(counts):    print(f"  {aug_names.get(idx, f'Type {idx}')}{counts[idx]} tiles")

该函数还支持以PyTorch张量格式输出瓦片数据,可直接对接训练流程。

tiles_tensor, aug_indices_tensor = geoai.flipnslide_augmentation(    image_data, tile_size=256, output_format="torch")print(f"Type: {type(tiles_tensor)}")print(f"Shape: {tiles_tensor.shape}")print(f"Dtype: {tiles_tensor.dtype}")

GeoAI包通过export_flipnslide_tiles()函数将数据增强后的瓦片导出为GeoTiff。该函数为地理空间适配封装接口,可保留每个瓦片的坐标参考系统与地理变换信息。

# 导出的路径,这是我的路径,注意替换output_flipnslide = "E:/Code/GeoAI/flipnslide_tiles"stats = geoai.export_flipnslide_tiles(    sample_image,    output_flipnslide,    tile_size=256,)print(f"\nTotal tiles: {stats['total_tiles']}")print(f"Tile size: {stats['tile_size']}px")print(f"Output folder: {stats['output_folder']}")

我们可以对比下标准网格分块与Flip-n-slide策略生成的瓦片数量。

# 标准网格分块(没有重叠)output_grid = "E:/Code/GeoAI/flipnslide_demo/grid_tiles"geoai.export_geotiff_tiles(    sample_image,    output_grid,    tile_size=256,    stride=256,    tiling_strategy="grid",)grid_tiles = list(Path(output_grid, "images").glob("*.tif"))# 标准网格分块(步长减半重叠)output_overlap = "E:/Code/GeoAI/flipnslide_demo/overlap_tiles"geoai.export_geotiff_tiles(    sample_image,    output_overlap,    tile_size=256,    stride=128,    tiling_strategy="grid",)overlap_tiles = list(Path(output_overlap, "images").glob("*.tif"))# Flip-n-Slide数据增强fns_tiles = list(Path(output_flipnslide, "images").glob("*.tif"))print("Tiling Strategy Comparison:")print(f"  Grid (stride=256):       {len(grid_tiles)} tiles")print(f"  Grid (stride=128):       {len(overlap_tiles)} tiles")print(f"  Flip-n-Slide:            {len(fns_tiles)} tiles")

export_flipnslide_tiles()函数支持tiling_strategy参数,可切换标准网格分块与Flip-n-Slide两种模式。

output_strategy = "E:/Code/GeoAI/flipnslide_demo/strategy_demo"geoai.export_geotiff_tiles(    sample_image,    output_strategy,    tile_size=256,    tiling_strategy="flipnslide",  # 使用Flip-n-Slide策略)strategy_tiles = list(Path(output_strategy, "images").glob("*.tif"))print(f"Tiles generated with tiling_strategy='flipnslide': {len(strategy_tiles)}")

我们简单总结下:

1. flipnslide_augmentation()函数可直接对NumPy数组或PyTorch张量执行Flip-n-Slide数据增强;

2. export_flipnslide_tiles()函数可导出带地理坐标的瓦片,完整保留坐标参考系统与地理变换信息;

3. 设置tiling_strategy="flipnslide"可以在flipnslide_augmentation()函数中使用Flip-n-Slide数据增强。

Flip-n-Slide数据增强方案有如下优势:

  • 保留空间信息:重叠瓦片可维持边界处的空间关联性
  • 内置多样化增强:无需依赖外部库,即可实现8种不同数据增强方式
  • 消除数据冗余:单个像素虽分布在多个瓦片中,但均经过不同变换处理
  • 适配地理空间数据:完整保留各瓦片的坐标参考系统与地理变换元数据
基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-06-21 04:45:56 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/775640.html
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  4. 会话信息 : SESSION_ID=7badceb8a848b29a81ae734f8725eed1
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  1. CONNECT:[ UseTime:0.000527s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000710s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000301s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000272s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000497s ]
  6. SELECT * FROM `set` [ RunTime:0.000218s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000570s ]
  8. SELECT * FROM `article` WHERE `id` = 775640 LIMIT 1 [ RunTime:0.000485s ]
  9. UPDATE `article` SET `lasttime` = 1781988356 WHERE `id` = 775640 [ RunTime:0.004188s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000256s ]
  11. SELECT * FROM `article` WHERE `id` < 775640 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000426s ]
  12. SELECT * FROM `article` WHERE `id` > 775640 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000720s ]
  13. SELECT * FROM `article` WHERE `id` < 775640 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001103s ]
  14. SELECT * FROM `article` WHERE `id` < 775640 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003600s ]
  15. SELECT * FROM `article` WHERE `id` < 775640 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007634s ]
0.119793s