気象庁の天気図をレイヤー毎に分ける(加工データの扱いについてはこちらを参照 https://www.jma.go.jp/jma/kishou/info/coment.html )

.py

import gzip
import xml.etree.ElementTree as ET
import pathlib


def map(distDir, root, ns):
    ret = root.findall("./g/g[@id='map']", ns)
    mapSettings = [
        ['sea', 'path', 'fill', '#DEF'],
        ['fillmap', 'polyline', 'stroke', '#000'],
        ['latlon', 'polyline', 'stroke', '#555']
    ]
    for c, t, k, v in mapSettings:
        elemSVG = ET.Element("svg")
        elemG = ret[0].findall(f"./g[@class='{c}']", ns)
        polylines = elemG[0].findall(f".//{t}", ns)
        for pl in polylines:
            pl.set(k, v)
        elemSVG.append(elemG[0])
        with open(f"{distDir}/map_{c}.svg", "wb") as f:
            ET.ElementTree(elemSVG).write(f, encoding="utf-8")


def others(distDir, root, ns):
    ret = root.findall("./g/g[@id='weatherChart']/g", ns)
    lys = [e.get("class") for e in ret]
    if len(ret) == 0:
        return
    for ly in lys:
        elemSVG = ET.Element("svg")
        rets = root.findall(f"./g/g[@id='weatherChart']/g[@class='{ly}']", ns)
        if len(rets) == 0 or len(rets[0]) == 0:
            continue
        for ret in rets:
            if ly == "occFront" or ly == "stnFront" or ly == "coldFront" or ly == "warmFront":
                frontSettings = [
                    ["occSymbol", "#FF0",  "#FF0"],
                    ["occLine", "#FF0",  "none"],
                    ["redSymbol", "#F00",  "#F00"],
                    ["blueSymbol", "#00F", "#00F"],
                    ["redLine", "#F00", "none"],
                    ["blueLine", "#00F", "none"]
                ]
                for c, s, f in frontSettings:
                    symbols = ret.findall(f"./*[@class='{c}']", ns)
                    for e in symbols:
                        e.set("fill", f)
                        e.set("stroke", s)
            else:
                polylines = ret.findall(f".//polyline", ns)
                for pl in polylines:
                    pl.set("stroke", "#000")
                paths = ret.findall(f".//path", ns)
                for pt in paths:
                    pt.set("stroke", "#000")

        for ret in rets:
            elemSVG.append(ret)
        with open(f"{distDir}/{ly}.svg", "wb") as f:
            ET.ElementTree(elemSVG).write(f, encoding="utf-8")


def getRootAndNS(filepath):
    try:
        with gzip.open(filepath, "rb") as f:
            file_content = f.read()
    except:
        try:
            with open(filepath, "r") as f:
                file_content = f.read()
        except:
            raise "Read error."
    root = ET.fromstring(file_content)
    ns = {"": "http://www.w3.org/2000/svg"}
    ns["ns0"] = ns[""]
    ET.register_namespace("", ns[""])
    return root, ns


# https://www.data.jma.go.jp/fcd/yoho/wxchart/quickdaily.html?show=20230601
# https://www.data.jma.go.jp/fcd/yoho/data/wxchart/quick/202306/SPAS_COLOR_202306010300.svgz
# 加工データの扱いについてはこちらを参照 https://www.jma.go.jp/jma/kishou/info/coment.html
srcFilepath = "./ASAS_COLOR_202306250000.svgz"
# srcFilepath = "./SPAS_COLOR_202306150300.svgz"
srcFinename = (srcFilepath.split("/")[-1]).split(".")[0]
distDir = f"/tmp/{srcFinename}"
pathlib.Path(distDir).mkdir(parents=True, exist_ok=True)
root, ns = getRootAndNS(srcFilepath)
map(distDir, root, ns)
others(distDir, root, ns)