continue open-elevation-api-server-upgrade

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+---
+title: "Open Elevation Api Server Upgrade"
+date: 2025-02-02
+draft: false
+tags: ["linux", "Debian", "bookworm", "buster", "bullseye", "bottle", "geospatial"]
+authors: ["trent"]
+post: 36
+---
+date: 2025-02-02
+
+## Introduction
+A while back I left an open-elevation-api-server running on Debian 10, and I can't remember why.
+
+But I have now worked out how to get it running on Debian 10, Debian 11, and Debian 12
+so I want to have what I learned written down here.
+### What is This?
+The api returns an elevation when you query it with gps coordinates.
+
+i.e. you want the elevation at Boring Bowling Alley and Petting Zoo?
+```bash
+curl 'https://elevation.boringonian.com/api/v1/lookup?locations=45.42949,-122.37563'
+```
+
+```json
+{"results": [{"latitude": 45.42949, "longitude": -122.37563, "elevation": 157}]}
+```
+
+## What changed?
+Going from Debian 10 to Debian 11, you have to change how to import gdal and osr.
+```python
+# gdal_interfaces.py
+# import gdal, osr
+from osgeo import gdal, osr
+...
+```
+Going from Debian 11 to Debian 12, `python3-lazy` is now installable from `apt-get`;
+no more _cowboy-pip3-installs_ ; all dependencies are now available from `apt-get`.
+
+## Debian 10 Installation 
+### install dependencies
+Here's how I got this working on Debian 10.
+```bash
+apt install python3-bottle python3-gunicorn
+apt install gdal-bin python3-gdal
+apt install python3-rtree python3-pip
+pip3-install lazy
+```
+### create user and home directory
+```bash
+mkdir /var/lib/elevation
+useradd -r -s /sbin/nologin -d /var/lib/elevation elevation
+```
+
+### setup your data directory
+[Follow the instructions](https://github.com/Jorl17/open-elevation/blob/master/docs/host-your-own.md)
+for extracting your 400 `*.tif` files and 1 `summary.json`
+to `/var/lib/elevation/data/`.
+
+Also place `gdal_interfaces.py` and `server.py` in
+`/var/lib/elevation/`
+
+in `server.py` I comment out the config-parser stuff and just hardcode
+the following
+```python
+# server.py
+interface = GDALTileInterface('data/', 'data/summary.json')                                                                                                                                                        
+interface.create_summary_json()
+```
+
+And of course then at the very bottom of `server.py` adjust the
+_run_ command for the host and port that you want gunicorn to listen on.
+
+## Debian 11 Installation 
+In upgrading from Debian 10 to Debian 11, change how you import gdal and osr.
+```python
+# gdal_interfaces.py
+# import gdal, osr
+from osgeo import gdal, osr
+...
+```
+Additionally, and I'm not completely clear if this is necessary or not, I deleted
+`/usr/local/lib/python3.7/` and then once again installed `lazy`.
+```bash
+rm -rf /usr/local/lib/python3.7/
+
+# installs lazy in /usr/local/lib/python3.9/
+pip3-install lazy
+```
+
+## Debian 12 Installation
+In upgrading from Debian 11 to Debian 12, it is no longer necessary to install lazy
+with pip.
+
+```bash
+rm -rf /usr/local/lib/python3.9/
+apt install python3-lazy
+```
+
+## Run as Systemd Service
+This is probably just based on a google search how to run a `bottle`
+server with `gunicorn` from `systemd`.
+```conf
+# /etc/systemd/system/elevation.service
+[Unit]
+Description=Bottled Elevation API 
+After=network.target remote-fs.target nss-lookup.target
+
+[Service]
+Type=simple
+User=elevation
+Group=elevation
+WorkingDirectory=/var/lib/elevation
+ExecStart=/usr/bin/python3 /var/lib/elevation/server.py
+StandardOutput=inherit
+StandardError=inherit
+Restart=always
+RestartSec=2
+
+[Install]
+WantedBy=multi-user.target
+```