opentopodata
geemap
opentopodata | geemap | |
---|---|---|
3 | 17 | |
297 | 3,207 | |
- | 1.9% | |
6.9 | 9.2 | |
2 months ago | about 23 hours ago | |
Python | Python | |
MIT License | MIT License |
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opentopodata
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I built an alternative to the Google Elevation API using open data
You can self-host an API serving open data (I also develop https://github.com/ajnisbet/opentopodata/ which helps you do this) but elevation data comes in different formats and quality levels which are non-trivial to merge without artefacts, and the datasets are too large for a typical cloud workflow.
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Show HN: An alternative to the Google Elevation API using open data
Hi HN!
GPXZ ([https://www.gpxz.io/](https://www.gpxz.io/)) is an API for elevation point queries. These APIs are used for things like flight planning, flood analysis, elevation profile visualisation, and weather forecast localisation.
Google Maps is the name brand elevation API but it's expensive, you are restricted in how you use the data, they decrease accuracy for batch queries, and their dataset is being left behind by all the amazing open data sources released in the last few years.
You can self-host an API serving open data (I also develop [https://github.com/ajnisbet/opentopodata/](https://github.co... which helps you do this) but elevation data comes in different formats and quality levels which are non-trivial to merge without artefacts, and the datasets are too large for a typical cloud workflow.
So I built the 12 TB GPXZ dataset, which carefully merges open lidar and satellite sources covering the whole globe. The idea is that with a single dataset you can get the best-possible data in your area of interest.
The [gpxz.io](http://gpxz.io) API runs on a boring stack: nginx, uwsgi and python on dedicated servers. Everything is in a django monolith, except the API which I recently liberated from the monolith into a standalone flask service. I have a few freelance customers who are paying me for data processing and managed opentopodata hosting that have been extremely helpful in validating this idea.
I know this is a niche service compared to most Show HNs, happy to answer any questions about elevation data or geospatial APIs!
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Ask HN: Do you use an elevation API?
Cool, I learned about abstreet the other day from HN! Thanks for the feedback.
These days I run everything geospatial in docker containers, the dependencies in geo are tricky.
Interesting about the memory/caching issues. I was going to suggest rasterio which I use for batch queries in https://github.com/ajnisbet/opentopodata and comes bundled with its own gdal binary, but looks like you're already using that.
I've also used zarr+tifffile for geotiffs in particular, it's faster and avoids a lot of gdal's warts, but you still need something like rasterio to read the geospatial metadata and handle projections.
geemap
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I'm a senior in my CS major and it's incredible I didn't hear about GIS projects until now. Glad to be here.
Try out Google Earth Engine and browse through it's catalogue to get a feel for what's available. GEE allows you to work with global datasets and immediately see a preview of the results (there's also geemap if you prefer doing this from a Python notebook instead of the online JS editor)
- Getting started with Google Earth Engine
- I'm building an IDE and open source library to make it easier to work with geospatial data using Python
- Opinion on Earth Engine or Planetary Computer?
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Confusion Matrix using Google Earth Engine Python API
Suggest using the ML module from geemap https://geemap.org/ Iv had a lot of success with that library.
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Does anyone use Google Earth Engine?
Check our Jupyter notebook GEEMAP package it's awesome! https://geemap.org/ Just last month Google opened up Google Earth Engine for commerical use. as Microsoft has Planetary Computer now.
- Google Earth Engine Tutorials
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Creating a timelapse of an area with satellite data
This Jupyter notebook package is great for working with Google Earth Engine and does timelapse https://geemap.org/
- Remote sensing class that uses Google Earth Engine worth taking?
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Software suggestion?
Good place to start is: https://geemap.org/
What are some alternatives?
osmnx - OSMnx is a Python package to easily download, model, analyze, and visualize street networks and other geospatial features from OpenStreetMap.
streamlit - Streamlit — A faster way to build and share data apps.