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SRTM.py

Geo elevation data parser for "The Shuttle Radar Topography Mission" data

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SRTM.py

SRTM.py is a python parser for the Shuttle Radar Topography Mission elevation data.

See: http://www2.jpl.nasa.gov/srtm/.

You can see SRTM.py in action on Trackprofiler (online GPS track editor and organizer).

There is also a Golang port of this library: go-elevations.

Usage:

import srtm
elevation_data = srtm.get_data()
print('CGN Airport elevation (meters):', elevation_data.get_elevation(50.8682, 7.1377))

Cache files with urls of all SRTM files are generated in your HOME directory. In case, you need another location:

import srtm
elevation_data = srtm.get_data(local_cache_dir="mydir")
print('CGN Airport elevation (meters):', elevation_data.get_elevation(50.8682, 7.1377))

GPS Tracks

You can add elevations for all points in a GPS track with:

import srtm
import gpxpy
gpx = gpxpy.parse(open('your-gpx-file.gpx'))
elevation_data = srtm.get_data()
elevation_data.add_elevations(gpx)

But this is raw SRTM data. If you need some approximations, you can try with:

import srtm.gpx
import gpxpy
gpx = gpxpy.parse(open('your-gpx-file.gpx'))
elevation_data = srtm.get_data()
elevation_data.add_elevations(gpx, smooth=True)

The result on a graph:

GPX elevations

In gray is the original elevation (taken with an Android smartphone). Blue is raw-srtm-data elevations, in red is the smoothed (approximated) srtm data.

You need gpxpy installed in order for this feature to work.

Elevation images

You can create elevation images with:

import srtm
geo_elevation_data = srtm.get_data()
image = geo_elevation_data.get_image((500, 500), (45, 46), (13, 14), 300)
# the image s a standard PIL object, you can save or show it:
image.show()

On every elevation requested the library will:

  • Check if the SRTM file is stored locally
  • If not -- download it from NASA servers and store locally (in ~/.cache/srtm/)
  • Parse elevations from it

That's why the first run of your application will always take a few seconds.

Example images

Istra and Trieste:

Istra

Rio de Janeiro:

Rio

Miami and florida:

Miami

Sidney:

Sidney

gpxelevations

gpxelevations is a utility command line tool to add/update elevations in a GPS track file:

$ gpxelevations -h
usage: gpxelevations [-h] [-o] [-p] [-s] [-c] [-f FILE] [-v]
                     [gpx_files [gpx_files ...]]

Adds elevation to GPX files

positional arguments:
  gpx_files             GPX files

optional arguments:
  -h, --help            show this help message and exit
  -o, --overwrite       Overwrite existing elevations (otherwise will add
                        elevations only where not yet present)
  -p, --approximate     Approximate elevations with neighbour points elevation
  -s, --smooth          Smooth elevations
  -c, --calculate       Calculate elevations (but don't change the GPX file)
  -f FILE, --file FILE  Output filename
  -v, --verbose         Verbose output

License

SRTM.py is licensed under the Apache License, Version 2.0

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