watergis/open-building-vt-generator
Domain:
geospatialRecord type:
software
Creator:
wat
Host:
This module is to convert csv files of Google's building data in Africa to GeoJSON files.
# open-building-vt-generator
This module is to convert csv files of Google's building data in Africa to GeoJSON files.
## Download
First of all, download all of building data by commandline.
```bash
gsutil cp -R gs://open-buildings-data/v1/polygons_s2_level_4_gzip .
```
The total size of files is 46GB for 135 files.
## Extract .csv.gz to .csv
```bash
find ./polygons_s2_level_4_gzip -type f -name "*.gz" -exec gunzip {} \;
```
The total size of files after extracting is 129.5GB
## Convert .csv to GeoJSON
- Installation
```bash
git clone git@github.com:watergis/google-building-csv2geojson.git
cd google-building-csv2geojson
npm i
```
- Convert
Modify `building-csv2geojson.test.js`
```js
const { BuidlingCsv2GeoJSON} = require('../src/index');
const path = require('path');
(() => {
// specify the directory where stored csv files
const inputDir = path.resolve(__dirname, './data')
// specify the directory where export to
const outputDir = path.resolve(__dirname, './output')
const csv2geojson = new BuidlingCsv2GeoJSON(inputDir, outputDir);
csv2geojson.convert();
})();
```
```bash
npm run convert
```
### generate vector tiles by tippecanoe
- if you just want to convert few GeoJSON files...
```bash
tippecanoe -P --no-feature-limit --no-tile-size-limit --force --minimum-zoom=15 --maximum-zoom=15 --base-zoom=15 --hilbert -l "open-buildings" -o open-buildings.mbtiles $(find ./tests/output/*.geojson)
```
This might take very long time to generate mbtiles if the number of GeoJSON is too much.
- if you want to convert in the entire Africa...
Modify `geojson2mbtiles.test.js`
```js
const { GeoJSON2mbtiles} = require('../src/index');
const path = require('path');
(async () => {
const parentDir = __dirname;
// specify the GeoJSON directory path.
const inputDir = path.resolve(parentDir, './output')
// specify the mbtiles directory path to export
const outputDir = path.resolve(parentDir, './mbtiles')
const geojson2mbtiles = new GeoJSON2mbtiles(inputDir, outputDir) …