GIS » Gisaf

h1. Software

Gisaf (for, eg, GIS Auroville Front-end) is a web application that is under development.

[[Server]]
[[Client]]
[[Stack]]
[[Mapbox]]

h2. Database

Gisaf uses a Postgis database.

h3. Creation

To create an appropriate database, run these commands:
<pre>
createuser avgis -P
createdb avgis -O avgis
psql avgis -c "CREATE EXTENSION postgis;"
</pre>

h3. Notes

The geometry features' metadata MUST be set with the proper SRID, which can be tricky. See below.

h3. Import files

[[Shapefiles]]
[[Rules of Map making - What all Maps should have!]]
[[Survey Database]]
[[Field to finish]]
[[Survey Data Post-Processing]]
[[Data (measurements, auxiliary tables)]]
[[Wells Documentation]]
[[Civil 3D useful commands]]
[[Online references for Civil 3D]]
[[connections in QGIS- using browser panel and Add postGIS]]

h2. Development

See the README file

h2. Configuration

TODO: more about parameters of the conf file

h3. Map

The default view of the map can be configured in the gisaf yaml config, eg:

<pre>
map:
openMapTilesKey: cS3lrAfYXoM4MDooT6aS
zoom: 14
pitch: 45
lat: 12.0000
lng: 79.8106
bearing: 0
style: OSM (vector)
opacity: 0.3
tilesUrl: /tiles/data/india-vector.json
</pre>

h3. Production

Gisaf reads the file @/etc/gisaf/prod.yml@ at boot.

h3. Development

Gisaf reads the @~/.gisaf/prod.yml@ file at boot.

h2. Third party

h3. TileServer

"TileServer-gl":https://github.com/klokantech/tileserver-gl is a small node application that can serve vector tiles (mbtiles) for mapbox without the need for an external provider.

The maps Gisaf base layers (the definition file being located in @gisaf-app/src/app/map/base_styles.ts@) in can be parametered such that a base layer is hosted locally (see the gisaf config file).

h4. Download the mbtiles

From: https://openmaptiles.com/downloads/planet/ , and store the relevant one on the server's filesystem (eg. @/usr/local/2017-07-03_asia_india.mbtiles@)

h4. Service

A systemd service configuration file, in @/etc/systemd/system/tileserver-gl-light.service@:

<pre>
cat /etc/systemd/system/tileserver-gl-light.service
[Service]
ExecStart=/usr/bin/node /usr/lib/node_modules/tileserver-gl-light/src/main.js --cors true -c /etc/tileserver/config.json
Restart=always
User=www-data
Group=www-data
Environment=NODE_ENV=production

[Install]
WantedBy=multi-user.target
</pre>

h4. Configuration

Eg, in @/etc/tileserver/conf.json@:

<pre>
{
"options": {
"paths": {
"root": "",
"fonts": "fonts",
"styles": "styles",
"mbtiles": ""
},
"domains": [
"gis.auroville.org.in"
],
"styles": {}
},
"data": {
"india-vector": {
"mbtiles": "/usr/local/2017-07-03_asia_india.mbtiles"
}
}
}
</pre>

h4. Run the service

<pre>
systemctl enable --now tileserver-gl-light.service
</pre>

h4. nginx proxy

In order the mbtiles to be served by tileserver, add in the nginx conf (adjust eventually):

<pre>
location /tiles/ {
proxy_pass http://127.0.0.1:8080/;
}
</pre>