Data Wrangling: Maps on Data Toolbox

(Geo) DataMerger

Mon, 01 Jan 0001 00:00:00 +0000

geo-data-merger.dataviz.jp

What is this tool?

A web-based tool for easily merging geographic data (GeoJSON/TopoJSON) with attribute data (CSV/JSON). It is a convenient data processing tool for when you want to link thematic data (e.g., population, attribute values) to map data.

Features

Load geographic and attribute data…Read GeoJSON/TopoJSON, CSV, and JSON files, and preview their contents.
Key-based join…Join geographic data (Feature properties) with attribute data using a common key column (left join basis).
Remove unnecessary columns…After merging, select and remove unwanted columns from the output via the UI.
Output format selection…Save and download the merged data as GeoJSON/TopoJSON/CSV.

How to use

1. Load geographic and attribute data…Load GeoJSON/TopoJSON on the left side and CSV/JSON on the right side.
1. Specify the join key…Select the column (key) used for joining from each data preview, and verify that they match correctly.
1. Remove unnecessary columns…Select and delete unneeded attribute columns after merging.
1. Export and save…Export the merged data as GeoJSON/TopoJSON/CSV.

Data formats

Input formats
- GeoJSON: Geographic Features (points/lines/polygons) + attributes.
- TopoJSON: A geographic data format that preserves topology (an extension of GeoJSON).
- CSV/JSON: Thematic data to merge (tabular data containing region codes or key-value pairs).
Output formats
- GeoJSON/TopoJSON: Merged geospatial data.
- CSV: Merged tabular data.

GeoJSON.io

Mon, 01 Jan 0001 00:00:00 +0000

dataviz.jp

GeoJSON.io

地図タイルをトレースしてGeoJSON作成

geojson.dataviz.jp

What is this tool?

A simple browser-based tool for creating, viewing, and sharing spatial data (such as GeoJSON). You can draw and edit geographic data on a map, and the corresponding GeoJSON is generated instantly, making it ideal for prototyping and verifying spatial data.

Features

Draw and edit data on a map…Draw markers (points), polylines (lines), and polygons (areas) on the map and freely edit them.
Real-time code editing and preview…Drawn shapes are instantly updated and displayed as GeoJSON code, and attribute editing is also supported.
Multi-format import…Import and edit spatial data including GeoJSON, TopoJSON, CSV, KML, and more (historically supported by the tool).
Simple attribute editing…Edit and delete field values in table view to adjust Feature properties.

How to use

Load data or create new drawings…Upload existing GeoJSON, or draw points, lines, and polygons on the map.
Edit attributes and code…Interactively edit drawings and attribute information.
Save and share…Download the completed GeoJSON as a file or share via URL parameters.

Data formats

Input formats
- GeoJSON: A JSON format centered on geographic Features (points, lines, areas).
- TopoJSON / CSV / KML / GPX, etc.: Multiple geographic data formats can be loaded and converted to GeoJSON for editing.
Output formats
- GeoJSON, TopoJSON, CSV, KML, WKT, Shapefile

GTFSネットワークデータ変換

Mon, 01 Jan 0001 00:00:00 +0000

dataviz.jp

GTFSネットワークデータ変換

交通データGTFSをネットワーク・データに変換します

gtfs-to-network.dataviz.jp

What is this tool?

Converts GTFS data, a common format for transit information, into network data.

Features

Uses stop information (stops.txt) and stop time information (stop_times.txt) to generate network data in CSV format.

1. stops.txt (used as node information)

Variable	Description	Required	Usage
`stop_id`	Stop ID	Yes	Used as node ID (source/target).
`stop_name`	Stop name	Yes	Node name attribute. Also assigned as origin/destination names for links.
`stop_lat`	Latitude	Yes	Node coordinates.
`stop_lon`	Longitude	Yes	Node coordinates.

2. stop_times.txt (used for link aggregation)

Variable	Description	Required	Usage
`trip_id`	Trip ID	Yes	Used for grouping to identify movements (A to B) within the same trip.
`stop_id`	Stop ID	Yes	Identifies the source and target of each link.
`stop_sequence`	Stop sequence	Yes	Determines travel order within a trip (used for sorting).
`arrival_time`	Arrival time	Yes	Calculates link travel time (next stop arrival - current stop departure).
`departure_time`	Departure time	Yes	Calculates link travel time.

Output data attributes (aggregated/calculated values)

CSV Header	Description	Calculation Method
`frequency`	Number of trips	Count of `trip_id`s traversing the same segment (source to target).
`avg_duration_sec`	Average travel time (seconds)	Average travel time for the same segment.

How to use

1. Upload GTFS files…Load the target files via drag-and-drop or file selection.
1. Specify the current format…Select whether it is 1 file or 2 files.
1. Press the convert button…
1. After conversion, the file is automatically downloaded.

Data formats

Input formats
- GTFS: Stop information (stops.txt)
- GTFS: Stop time information (stop_times.txt)
Output formats
- CSV (single-file format): Nodes and links combined in a single file
- CSV (two-file format): Nodes and links in separate files

Japanese-Western Calendar Converter

Mon, 01 Jan 0001 00:00:00 +0000

dataviz.jp

Japanese-Western Calendar Converter

Convert between Japanese era dates and Western dates

calendar-converter.dataviz.jp

What is this tool?

A browser-based tool for converting between Japanese era dates (Showa, Heisei, Reiwa) and Western calendar dates. You can type a date and see the conversion in real time, or drop a CSV file to auto-detect date columns and batch-convert them for download. All processing runs entirely in your browser — no data is ever sent to a server.

Features

Real-time conversion — Type in either the Japanese era or Western date field, and the other field updates instantly
CSV batch conversion — Drag & drop a CSV file to auto-detect date columns and batch-convert them. Preview the results before downloading
Auto character encoding detection — Automatically detects UTF-8 and Shift_JIS, so CSV files created in Excel can be loaded as-is
Multiple date formats supported — Accepts commonly used formats such as R6.3.22, 令和6年3月22日, 2024/03/22, 2024-03-22, and more
Output format options — When converting to Japanese era dates, choose between alphabetic notation (R6.3.22) or kanji notation (令和6年3月22日)
Bilingual UI — The interface displays in Japanese or English based on your browser’s language setting

How to use

Manual conversion

Enter a date in either the “Japanese era” or “Western” input field at the top of the page
The converted result appears automatically in the other field

Batch file conversion

Drag & drop a CSV file onto the drop area (or click to select a file)
Date columns are auto-detected and a before/after preview is displayed
Select the conversion direction (Japanese era → Western / Western → Japanese era) and format as needed
Click “Convert and Download” to download the converted CSV

Data formats

Supported input formats

Type	Example formats
Japanese era (alphabetic)	`S49.9.24`, `H1-1-8`, `R6/3/22`
Japanese era (kanji)	`昭和49年9月24日`, `令和元年5月1日`
Western	`2024/03/22`, `2024-03-22`, `2024.3.22`

Supported eras

Era	Abbreviation	Period
Showa (昭和)	S	1926/12/25 – 1989/01/07
Heisei (平成)	H	1989/01/08 – 2019/04/30
Reiwa (令和)	R	2019/05/01 –

Batch file conversion

Supported file formats: CSV, TSV, TXT
Delimiters (comma, tab) are auto-detected
Character encoding (UTF-8, Shift_JIS) is auto-detected
Output is UTF-8 (with BOM) CSV, which opens directly in Excel

Mapbox Classic スタイル生成

Mon, 01 Jan 0001 00:00:00 +0000

dataviz.jp

Mapbox Classic スタイル生成

Kepler.gl や Foursquare Studio で利用可能な Mapbox 地図タイル

classic-mapbox-styles.dataviz.jp

What is this tool?

A web tool for generating and managing style definitions (JSON) for legacy Mapbox Classic styles. Mapbox Classic was a set of classic map style templates provided by Mapbox, used to generate and serve map styles compatible with map tools such as Kepler.gl and Foursquare Studio.

Features

Mapbox Classic style generation…Generate and reference Classic style JSON files (e.g., Streets, Light, Dark, etc.).
Compatible with Kepler.gl and similar tools…Use the generated styles as base maps in map visualization tools like Kepler.gl.
Template management…Organizes Mapbox Classic standard templates for easy access, with features to retrieve and edit JSON as needed.

How to use

Obtain a Mapbox token
Enter your Mapbox token
Select a style template…Choose a Classic style (e.g., Light / Dark / Streets, etc.).
Generate JSON…Generate the Mapbox Classic style JSON based on your selection and edits.
Import…Import the generated style JSON into Mapbox Studio.
Base maps created in Mapbox Studio can be used in Kepler.gl and Foursquare Studio.

Data formats

Mapbox token

Mapshaper

Mon, 01 Jan 0001 00:00:00 +0000

dataviz.jp

Mapshaper

mapshaper.dataviz.jp

What is this tool?

A web-based tool for editing, converting, and simplifying geospatial vector data (GIS). It loads map data and lets you intuitively perform operations such as shape simplification, attribute editing, and format conversion. Its key advantage is the ability to process data in the browser without relying on desktop GIS software.

Features

Load and display geographic data: Import and display vector data such as Shapefile, GeoJSON, and TopoJSON.
Shape simplification: Reduce polygon/line vertices to shrink file size while preserving topology.
Attribute data editing: Modify and join attribute table contents, or delete unnecessary fields.
Conversion and export: Convert and export to multiple formats (Shapefile, GeoJSON, TopoJSON, CSV, TSV, SVG, etc.).
Clipping and dissolving: GIS processing such as clipping, merging, splitting, and dropping data.

How to use

1. Load and display data…Imported geographic data is displayed in map view, where you can review attributes and shapes.
1. Edit and process
- Simplification: Run tools for vertex reduction and topology preservation.
- Attribute editing: Add, delete, or join fields.
- Merge and clip: Merge multiple datasets or clip to a specified area.
1. Export…Save and download in the desired format from the Export menu.

Data formats

Mapshaper handles the following major GIS vector data formats for input and output:
Shapefile (ESRI’s standard GIS format; a set of .shp/.dbf/.shx files, etc.)
GeoJSON (JSON-based geographic information format)
TopoJSON (topology-compressed format based on GeoJSON)
CSV / TSV (as tabular data containing coordinates and attributes)
SVG (as vector image output for geographic shapes)

SVG ⇄ GeoJSON 変換ツール

Mon, 01 Jan 0001 00:00:00 +0000

dataviz.jp

SVG ⇄ GeoJSON 変換ツール

GeoJSON と SVG の相互変換を支援

geojson-and-svg.dataviz.jp

What is this tool?

A web-based tool that assists with converting and visualizing between geospatial data (GeoJSON) and SVG (vector image format).

It is designed to convert geographic information such as map data and polygons into the SVG format, which is convenient for web display and print use, or to help work with SVG as GeoJSON format.

GeoJSON is a standard JSON-based format for location data, widely used for web mapping and GIS integration.

Features

Bi-directional conversion between geospatial data (GeoJSON) and SVG (vector image format)

How to use

1. Load a file
1. Download

No special operations are required.

Data formats

SVG
GeoJSON

バッファ生成ツール

Mon, 01 Jan 0001 00:00:00 +0000

dataviz.jp

バッファ生成ツール

turf-buffer.dataviz.jp

What is this tool?

A web-based spatial analysis tool that generates “buffers (buffer zones)” at a specified distance around geospatial data (points, lines, polygons).

A buffer is a polygon area that expands a specified distance around a given feature, and is a technique commonly used in GIS spatial analysis.

When creating data maps with buffers such as “within a 10-minute walk from a certain point,” using the desktop application QGIS requires the following steps:

1. Convert the data file from a geographic coordinate system to a projected coordinate system that varies by region
1. Perform the buffering operation
1. Convert back to the geographic coordinate system for output

This tool eliminates this complex workflow, enabling completion in just a few clicks within the browser.

Features

Buffer generation Creates a buffer zone at a specified distance (radius) around the input points, lines, or polygons.
Map preview View the loaded data and generated buffer areas on a web map.
Output format Download buffer results as GeoJSON or SVG.

How to use

1. Upload CSV data…Select a CSV file containing latitude and longitude columns.
1. Specify buffer parameters…Enter the buffer radius (in meters).
1. Generate and review the buffer…Press the create button, and the buffer areas are drawn on the map.
1. Download…Download the results in GeoJSON or SVG format.

Data formats

Input formats
- CSV (tabular data containing latitude and longitude) is loaded for processing.
Output formats
- GeoJSON: Retrieve the generated buffer areas in GeoJSON format.
- SVG: Download as an SVG vector image.

住所 → 緯度経度変換ツール

Mon, 01 Jan 0001 00:00:00 +0000

dataviz.jp

住所 → 緯度経度変換ツール

address-to-latlon.dataviz.jp

What is this tool?

A web-based tool that converts Japanese address data into latitude and longitude (coordinates) through geocoding. It can batch-convert multiple addresses into GPS coordinates for use in map creation and location analysis.

Features

Batch conversion (CSV support)…Upload a CSV file containing multiple addresses, and retrieve latitude and longitude for each address.
High-accuracy geocoding…Uses Geolonia’s community geocoder (based on the Ministry of Land, Infrastructure, Transport and Tourism’s Address Reference Information), achieving conversion accuracy specialized for Japanese addresses.
Character encoding support…You can specify the character encoding of the input file (UTF-8 / Shift_JIS).
Browser-only processing…Data is processed entirely within the browser and is never sent to a server (privacy protection).

How to use

1. Upload a CSV file…Load address data by clicking or drag-and-dropping a CSV file.
1. Specify the character encoding…Select the appropriate encoding from UTF-8 / Shift_JIS.
1. Run the conversion…A CSV file with automatically added latitude and longitude columns is generated.
1. Download / Use…Download the output CSV and import it into map rendering or analysis tools.

Data formats

Tabular data (CSV)

地図タイル・ブラウザー

Mon, 01 Jan 0001 00:00:00 +0000

dataviz.jp

地図タイル・ブラウザー

what-the-tile.dataviz.jp

座標系変換ツール

Mon, 01 Jan 0001 00:00:00 +0000

dataviz.jp

座標系変換ツール

地物ファイルの座標を変換

transform-coordinates.dataviz.jp

緯度経度フォーマッター

Mon, 01 Jan 0001 00:00:00 +0000

dataviz.jp

緯度経度フォーマッター

緯度経度データの桁数を簡単に変換

latlon-formatter.dataviz.jp

What is this tool?

A web tool for easily converting the format of latitude and longitude data within CSV files. It is useful when you need to organize and standardize coordinate notation formats when working with geographic data.

Features

Format conversion
Bi-directional conversion between single-column format (latitude and longitude in one cell, e.g., “35.6762,139.6503”) and two-column format (separate latitude and longitude columns).
Auto-detection Automatically detects latitude and longitude columns in the input CSV.
Data preview View the CSV before and after conversion on the spot.
Decimal precision adjustment Adjust the number of decimal places for latitude and longitude values.
Download Download the converted CSV as a file.
Browser-only processing All processing is completed within the browser with no server communication required.

How to use

1. Upload a CSV…Load the target CSV via drag-and-drop or file selection.
1. Specify the current format…Select whether latitude and longitude are in single-column or two-column format.
1. Choose the output format…Select the desired single-column or two-column format.
1. Adjust precision (optional)…Set the number of decimal places for latitude and longitude.
1. Convert and download…After running the conversion, review the preview and download the CSV.

Data formats

Input formats
- CSV: Tabular data with latitude and longitude in either single-column or two-column notation.
Output formats
- CSV (single-column format): Latitude and longitude combined in a single field as “latitude,longitude”.
- CSV (two-column format): Standard format with separate latitude and longitude columns.

Data Wrangling: Maps on Data Toolbox

(Geo) DataMerger

What is this tool?

Features

How to use

Data formats

GeoJSON.io

What is this tool?

Features

How to use

Data formats

GTFSネットワークデータ変換

What is this tool?

Features

1. stops.txt (used as node information)

2. stop_times.txt (used for link aggregation)

Output data attributes (aggregated/calculated values)

How to use

Data formats

Japanese-Western Calendar Converter

What is this tool?

Features

How to use

Manual conversion

Batch file conversion

Data formats

Supported input formats

Supported eras

Batch file conversion

Mapbox Classic スタイル生成

What is this tool?

Features

How to use

Data formats

Mapshaper

What is this tool?

Features

How to use

Data formats

SVG ⇄ GeoJSON 変換ツール

What is this tool?

Features

How to use

Data formats

バッファ生成ツール

What is this tool?

Features

How to use

Data formats

住所 → 緯度経度 変換ツール

What is this tool?

Features

How to use

Data formats

地図タイル・ブラウザー

座標系 変換ツール

緯度経度フォーマッター

What is this tool?

Features

How to use

Data formats

住所 → 緯度経度変換ツール

座標系変換ツール