シェープファイルへの書き出し

今回は作成した world を書き出す

これは GeodataFlameになっていれば簡単にできる

保存するときにはto_file を使う

シェープファイルで保存するなら

world.to_file(driver='ESRI Shapefile',filename='test_shape_world.shp')

というように
driverへ ESRI Shapefileを指定すればいい

でも

/Users/snowpool/.pyenv/versions/3.11.0/lib/python3.11/site-packages/pyogrio/raw.py:723: RuntimeWarning: Value 328239523 of field POP_EST of feature 4 not successfully written. Possibly due to too larger number with respect to field width
  ogr_write(
/Users/snowpool/.pyenv/versions/3.11.0/lib/python3.11/site-packages/pyogrio/raw.py:723: RuntimeWarning: Value 270625568 of field POP_EST of feature 8 not successfully written. Possibly due to too larger number with respect to field width
  ogr_write(
/Users/snowpool/.pyenv/versions/3.11.0/lib/python3.11/site-packages/pyogrio/raw.py:723: RuntimeWarning: Value 144373535 of field POP_EST of feature 18 not successfully written. Possibly due to too larger number with respect to field width
  ogr_write(
/Users/snowpool/.pyenv/versions/3.11.0/lib/python3.11/site-packages/pyogrio/raw.py:723: RuntimeWarning: Value 127575529 of field POP_EST of feature 27 not successfully written. Possibly due to too larger number with respect to field width
  ogr_write(
/Users/snowpool/.pyenv/versions/3.11.0/lib/python3.11/site-packages/pyogrio/raw.py:723: RuntimeWarning: Value 211049527 of field POP_EST of feature 29 not successfully written. Possibly due to too larger number with respect to field width
  ogr_write(
/Users/snowpool/.pyenv/versions/3.11.0/lib/python3.11/site-packages/pyogrio/raw.py:723: RuntimeWarning: Value 200963599 of field POP_EST of feature 56 not successfully written. Possibly due to too larger number with respect to field width
  ogr_write(
/Users/snowpool/.pyenv/versions/3.11.0/lib/python3.11/site-packages/pyogrio/raw.py:723: RuntimeWarning: Value 1366417754 of field POP_EST of feature 98 not successfully written. Possibly due to too larger number with respect to field width
  ogr_write(
/Users/snowpool/.pyenv/versions/3.11.0/lib/python3.11/site-packages/pyogrio/raw.py:723: RuntimeWarning: Value 163046161 of field POP_EST of feature 99 not successfully written. Possibly due to too larger number with respect to field width
  ogr_write(
/Users/snowpool/.pyenv/versions/3.11.0/lib/python3.11/site-packages/pyogrio/raw.py:723: RuntimeWarning: Value 216565318 of field POP_EST of feature 102 not successfully written. Possibly due to too larger number with respect to field width
  ogr_write(
/Users/snowpool/.pyenv/versions/3.11.0/lib/python3.11/site-packages/pyogrio/raw.py:723: RuntimeWarning: Value 1397715000 of field POP_EST of feature 139 not successfully written. Possibly due to too larger number with respect to field width
  ogr_write(
/Users/snowpool/.pyenv/versions/3.11.0/lib/python3.11/site-packages/pyogrio/raw.py:723: RuntimeWarning: Value 108116615 of field POP_EST of feature 147 not successfully written. Possibly due to too larger number with respect to field width
  ogr_write(
/Users/snowpool/.pyenv/versions/3.11.0/lib/python3.11/site-packages/pyogrio/raw.py:723: RuntimeWarning: Value 126264931 of field POP_EST of feature 155 not successfully written. Possibly due to too larger number with respect to field width
  ogr_write(
/Users/snowpool/.pyenv/versions/3.11.0/lib/python3.11/site-packages/pyogrio/raw.py:723: RuntimeWarning: Value 100388073 of field POP_EST of feature 163 not successfully written. Possibly due to too larger number with respect to field width
  ogr_write(
/Users/snowpool/.pyenv/versions/3.11.0/lib/python3.11/site-packages/pyogrio/raw.py:723: RuntimeWarning: Value 112078730 of field POP_EST of feature 165 not successfully written. Possibly due to too larger number with respect to field width
  ogr_write(

となる

GPTによれば
併せて知っておくと良い Shapefile の制約
* フィールド名は最大 10 文字（長い列名は切られる）
* 文字列の最大長、数値の幅と小数点以下桁を持つ
* 64bit 整数を正式には持てない
* 複数のファイル（.shp/.shx/.dbf …）が必要

警告は Shapefile のフィールド幅不足。
ベストは GeoPackage/GeoJSON へ保存。
Shapefile が必須なら layer_options で幅指定を。

これは Shapefile（.shp）側の制約で数値フィールドの桁数が足りないために出る警告です。
Shapefile は属性を dBase(DBF) で持ちますが、各数値フィールドには「幅（桁数）と小数桁」を設定する必要があり、デフォルト推定だと POP_EST のような 10桁超え（例: 1,306,370,000）が収まりきらずに “not successfully written / too large for field width” になります。

Shapefile は古く、制限が多いです。GeoPackageやGeoJSONなら桁数制限に悩まされません。

このためGeoJSONでj保存する

world.to_file(driver='GeoJSON',filename='test_shape_world.geojson')

driverにGeoJSON　ファイル拡張子を .geojsonにすればOK

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