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Update Dev Notes

Jon Roeber 2024-01-18 04:09:53 +00:00
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Dev-Notes.md

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## 20240117
Example SQL query to convert Cayenne GPS location into PostGIS point:
Example SQL query to convert Cayenne GPS location into PostGIS point, include RSSI, time, and gatewayId, and filter on gatewayId:
```sql
WITH gps(alt, lat, lon) AS
CREATE OR REPLACE VIEW qgis_friendly AS
WITH data(gatewayId, time, alt, lat, lon, rssi) AS
(SELECT
rx_info -> 0 ->> 'gatewayId',
time,
CAST (object -> 'gpsLocation' -> '1' ->> 'altitude' AS FLOAT),
CAST (object -> 'gpsLocation' -> '1' ->> 'latitude' AS FLOAT),
CAST (object -> 'gpsLocation' -> '1' ->> 'longitude' AS FLOAT)
CAST (object -> 'gpsLocation' -> '1' ->> 'longitude' AS FLOAT),
CAST (rx_info -> 0 ->> 'rssi' AS INTEGER)
FROM event_up)
SELECT ST_MakePoint(lon, lat, alt)
FROM gps;
SELECT gatewayId, time, ST_MakePoint(lon, lat, alt) AS location, rssi
FROM data
WHERE gatewayId = '8d269c95ddfe92eb';
```
`CREATE EXTENSION postgis;` must be run on each database, not just the PostgreSQL instance.