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https://github.com/watergis/postgis2geojson
This module is to extract GeoJSON files by SQL from PostGIS database.
https://github.com/watergis/postgis2geojson
geojson postgis
Last synced: 23 days ago
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This module is to extract GeoJSON files by SQL from PostGIS database.
- Host: GitHub
- URL: https://github.com/watergis/postgis2geojson
- Owner: watergis
- License: mit
- Created: 2020-07-14T02:36:22.000Z (over 4 years ago)
- Default Branch: master
- Last Pushed: 2024-03-17T12:07:50.000Z (9 months ago)
- Last Synced: 2024-10-30T05:43:06.619Z (about 2 months ago)
- Topics: geojson, postgis
- Language: JavaScript
- Homepage:
- Size: 1.97 MB
- Stars: 2
- Watchers: 2
- Forks: 1
- Open Issues: 3
-
Metadata Files:
- Readme: README.md
- Funding: .github/FUNDING.yml
- License: LICENSE
Awesome Lists containing this project
README
# postgis2geojson
This module is to extract GeoJSON files by SQL from PostGIS database.
## Install
```
npm install @watergis/postgis2geojson
```
## Usage
```js
const {postgis2geojson} = require('@watergis/postgis2geojson');
const config = require('./config');
const pg2json = new postgis2geojson(config);
pg2json.run().then(res=>{
console.log(res);
}).catch(err=>{
console.log(err);
})
```
`config.js`
```js
module.exports = {
db: {
user:process.env.DB_USER,
password:process.env.DB_PASSWORD,
host:process.env.DB_HOST,
port:process.env.DB_PORT,
database:'narwassco',
},
layers : [
{
name: 'pipeline',
geojsonFileName: export_dir + '/pipeline.geojson',
select: `
SELECT row_to_json(featurecollection) AS json FROM (
SELECT
'FeatureCollection' AS type,
array_to_json(array_agg(feature)) AS features
FROM (
SELECT
'Feature' AS type,
ST_AsGeoJSON(ST_TRANSFORM(ST_MakeValid(x.geom),4326))::json AS geometry,
row_to_json((
SELECT p FROM (
SELECT
x.pipeid as fid,
a.name as pipetype,
x.pipesize,
b.name as material,
x.constructiondate,
x.insertdate,
x.updatedate,
x."Town"
) AS p
)) AS properties
FROM pipenet x
INNER JOIN pipetype a
ON x.pipetypeid = a.pipetypeid
INNER JOIN material b
ON x.materialid = b.materialid
WHERE NOT ST_IsEmpty(x.geom)
) AS feature
) AS featurecollection
`
},
]
}
```
See the test module under `test` directory.
## Build
```
npm run build
```
## Test
```
npm run test
```