[OSM-ja] Japan post code polygons

Satoshi IIDA nyampire @ gmail.com
2015年 1月 27日 (火) 04:14:56 UTC


Amazing work!

1. source of geo-data
At first glance, e-Stats data is not "Open" as we use.
Data re-distribution is forbidden by Terms of Use.

> B-7. 第三者に提供することを目的として、ダウンロードしたデータを利用することはできますか?
> 本システムからダウンロードしたデータを複製(ファイル形式を変換しての複製を含む)してそのまま第三者に譲渡することは禁じています。
> 詳細については、ダウンロードデータについての『使用上の注意』をご参照ください。

> 2.利用の制限

Maybe "そのまま複製 (just copied one)" in this sentence means
"データを付け加えるなど、加工すれば配布OK (modified data is permitted to distribute)".
Is my understanding same as yours? :)

2. Combination of "丁目" polygon and ZIP-code digit
Perfect correspondence would be difficult, but it is worth to tackle!

Famous errors in ZIP csv are summarized in this site.

I guess most annoying is "○○の一部 (part of XXX chome)" descriptions.
Famous around Iwate Prefecture.

In other word, I guess we could make 99% of the data (except those errors).


2015-01-27 7:10 GMT+09:00 Tom Lee <tlee @ mapbox.com>:

> Update: I have spent some time experimenting with the Census shapefiles,
> and it seems as though one of their ID fields might be usable for joining
> census polygons into postal code polygons. Specifically:
> shp2pgsql -W SJIS h22ka13115.shp tokyo1 | psql japan
> echo "create table tokyozip as select left(KEY_CODE, 10) as KEY_CODE,
> st_setsrid(st_union(st_buffer(geom,0)),4326) as geom from tokyo1 group by
> left(KEY_CODE, 10);" | psql japan
> Was used to generate the following shapefile:
> http://cl.ly/3p2V1p400h3b/possible_tokyo_postcode.zip
> Assigning the correct post code is still a problem to be solved. I also
> don't have as much data (or familiarity with Japanese post codes) as I
> would like to test this hypothesis. Any advice will be much appreciated.
> http://i.imgur.com/JMYR09w.jpg
> Tom
> On Mon, Jan 26, 2015 at 3:37 PM, Tom Lee <tlee @ mapbox.com> wrote:
>> I have been trying to find geometry that corresponds to Japanese postal
>> codes (sometimes also called zip codes). I initially joined Japan Post's
>> CSV download to MLIT's administrative boundary shapefile, but this has
>> proven to be too low-resolution.
>> I have found the PAREA Zip product
>> <http://www.parea.jp/datebase/area_map/index.html>, but of course an
>> open source of data would be preferable.
>> I am particularly curious to know whether E-Stat/Census data can be used
>> to create postal code polygons. If you visit this URL:
>> http://e-stat.go.jp/SG2/eStatGIS/page/download.html
>> and select "平成22年国勢調査(小地域) 2010/10/01"
>> You can then choose a smaller area and download a high-resolution mesh as
>> a shapefile. That file's field definitions can be found here:
>> http://e-stat.go.jp/SG2/eStatFlex/help/content/downloaddata/A002005212010.pdf
>> Here is one such shapefile in QGIS, overlaid on Bing aerial imagery:
>> http://i.imgur.com/7z1dhn4.jpg
>> Although the polygons are well-indexed, they do not seem to correspond to
>> postal codes.
>> Is anyone aware of a means of mapping the data included in this shapefile
>> to postal codes? I would be very glad to share the results of my efforts
>> under an open license, should I prove able to solve this problem (E-Stat's
>> license seems to make this possible).
>> Thanks very much!
>> Tom Lee
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Satoshi IIDA
mail: nyampire @ gmail.com
twitter: @nyampire
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