rio-tiler-crs

一个用于在不同投影中创建瓦片的rio-tiler插件

安装

$ pip install pip -U
$ pip install rio-tiler-crs

# Or using source

$ pip install git+http://github.com/cogeotiff/rio-tiler-crs

如何使用

rio-tiler-crs使用morecantile来定义自定义瓦片网格模式。

1. 定义网格系统

import morecantile
from rasterio.crs import CRS

# Use default TMS
tms = morecantile.tms.get("WorldCRS84Quad")

# or create a custom TMS
crs = CRS.from_epsg(3031)  # Morecantile TileMatrixSet uses Rasterio CRS object
extent = [-948.75, -543592.47, 5817.41, -3333128.95]  # From https:///epsg.io/3031
tms = morecantile.TileMatrixSet.custom(extent, crs)

2. 读取瓦片

from rio_tiler_crs import COGReader

# Read tile x=10, y=10, z=4
with COGReader("myfile.tif", tms=tms) as cog:
    tile, mask = cog.tile( 10, 10, 4)

API

class COGReader:
    """
    Cloud Optimized GeoTIFF Reader.

    Examples
    --------
    with CogeoReader(src_path) as cog:
        cog.tile(...)
    
    with rasterio.open(src_path) as src_dst:
        with WarpedVRT(src_dst, ...) as vrt_dst:
            with CogeoReader(None, dataset=vrt_dst) as cog:
                cog.tile(...)

    with rasterio.open(src_path) as src_dst:
        with CogeoReader(None, dataset=src_dst) as cog:
            cog.tile(...)

    Attributes
    ----------
    filepath: str
        Cloud Optimized GeoTIFF path.
    dataset: rasterio.DatasetReader, optional
        Rasterio dataset.
    tms: morecantile.TileMatrixSet, optional
        TileMatrixSet to use, default is WebMercatorQuad.

    Properties
    ----------
    minzoom: int
        COG minimum zoom level in TMS projection.
    maxzoom: int
        COG maximum zoom level in TMS projection.
    bounds: tuple[float]
        COG bounds in WGS84 crs.
    center: tuple[float, float, int]
        COG center + minzoom
    colormap: dict
        COG internal colormap.
    info: dict
        General information about the COG (datatype, indexes, ...)

    Methods
    -------
    tile(0, 0, 0, indexes=(1,2,3), expression="
B1/B2", tilesize=512, resampling_methods="nearest")
        Read a map tile from the COG.
    part((0,10,0,10), indexes=(1,2,3,), expression="
B1/B20", max_size=1024)
        Read part of the COG.
    preview(max_size=1024)
        Read preview of the COG.
    point((10, 10), indexes=1)
        Read a point value from the COG.
    stats(pmin=5, pmax=95)
        Get Raster statistics.
    meta(pmin=5, pmax=95)
        Get info + raster statistics

    """

• COGReader.tile()：从栅格中读取地图瓦片

tms = morecantile.tms.get("WorldCRS84Quad")
with COGReader("myfile.tif", tms=tms) as cog:
    tile, mask = cog.tile(1, 2, 3, tilesize=256)

# With indexes
with COGReader("myfile.tif", tms=tms) as cog:
    tile, mask = cog.tile(1, 2, 3, tilesize=256, indexes=1)

# With expression
with COGReader("myfile.tif", tms=tms) as cog:
    tile, mask = cog.tile(1, 2, 3, tilesize=256, expression="B1/B2")

• COGReader.part()：读取栅格的一部分

注意：tms对part读取没有影响。

tms = morecantile.tms.get("WorldCRS84Quad")
with COGReader("myfile.tif", tms=tms) as cog:
    data, mask = cog.part((10, 10, 20, 20))

# Limit output size (default is set to 1024)
with COGReader("myfile.tif", tms=tms) as cog:
    data, mask = cog.part((10, 10, 20, 20), max_size=2000)

# Read high resolution
with COGReader("myfile.tif", tms=tms) as cog:
    data, mask = cog.part((10, 10, 20, 20), max_size=None)

# With indexes
with COGReader("myfile.tif", tms=tms) as cog:
     data, mask = cog.part((10, 10, 20, 20), indexes=1)

# With expression
with COGReader("myfile.tif", tms=tms) as cog:
    data, mask = cog.part((10, 10, 20, 20), expression="B1/B2")

• COGReader.preview()：读取栅格的预览

注意：tms对part读取没有影响。

with COGReader("myfile.tif") as cog: 
    data, mask = cog.preview()

# With indexes
with COGReader("myfile.tif") as cog: 
    data, mask = cog.preview(indexes=1)

# With expression
with COGReader("myfile.tif") as cog: 
    data, mask = cog.preview(expression="B1+2,B1*4")

• COGReader.point()：读取栅格的点值

注意：tms对part读取没有影响。

with COGReader("myfile.tif") as cog: 
    print(cog.point(-100, 25))

# With indexes
with COGReader("myfile.tif") as cog: 
    print(cog.point(-100, 25, indexes=1)) 
[1]

# With expression
with COGReader("myfile.tif") as cog: 
    print(cog.point(-100, 25, expression="B1+2,B1*4"))
[3, 4]

• COGReader.info：返回关于栅格的简单元数据

with COGReader("myfile.tif") as cog:
    print(cog.info)
{
    "bounds": [-119.05915661478785, 13.102845359730287, -84.91821332299578, 33.995073647795806],
    "center": [-101.98868496889182, 23.548959503763047, 3],
    "minzoom": 3,
    "maxzoom": 12,
    "band_metadata": [[1, {}]],
    "band_descriptions": [[1,"band1"]],
    "dtype": "int8",
    "colorinterp": ["palette"],
    "nodata_type": "Nodata",
    "colormap": {
        "0": [0, 0, 0, 0],
        "1": [0, 61, 0, 255],
        ...
    }
}

• COGReader.stats()：返回图像统计数据（最小值/最大值/标准差）

with COGReader("myfile.tif") as cog:
    print(cog.stats())
{
    "1": {
        "pc": [1, 16],
        "min": 1,
        "max": 18,
        "std": 4.069636227214257,
        "histogram": [
            [...],
            [...]
        ]
    }
}

• COGReader.metadata()：返回COG信息和统计数据

with COGReader("myfile.tif") as cog:
    print(cog.metadata())
{
    "bounds": [-119.05915661478785, 13.102845359730287, -84.91821332299578, 33.995073647795806],
    "center": [-101.98868496889182, 23.548959503763047, 3],
    "minzoom": 3,
    "maxzoom": 12,
    "band_metadata": [[1, {}]],
    "band_descriptions": [[1,"band1"]],
    "dtype": "int8",
    "colorinterp": ["palette"],
    "nodata_type": "Nodata",
    "colormap": {
        "0": [0, 0, 0, 0],
        "1": [0, 61, 0, 255],
        ...
    }
    "statistics" : {
        1: {
            "pc": [1, 16],
            "min": 1,
            "max": 18,
            "std": 4.069636227214257,
            "histogram": [
                [...],
                [...]
            ]
        }
    }
}
   

示例

见/demo

贡献与发展

欢迎提交问题和拉取请求。

dev安装

$ git clone https://github.com/cogeotiff/rio-tiler-crs.git
$ cd rio-tiler-crs
$ pip install -e .[dev]

仅Python >=3.7

此仓库设置为在提交新代码时使用pre-commit来运行isort、flake8、pydocstring、black（“不妥协的Python代码格式化器”）和mypy。

$ pre-commit install

$ git add .

$ git commit -m'my change'
isort....................................................................Passed
black....................................................................Passed
Flake8...................................................................Passed
Verifying PEP257 Compliance..............................................Passed
mypy.....................................................................Passed

$ git push origin