pylandtemp

Description

pylandtemp is a Python library that provides a simple API for computing global land surface temperature and emissivity from NASA's Landsat Level 1 satellite images (starting from Landsat 5 to Landsat 8). It contains some implementations of Single-Channel and split window techniques. More methodologies under these groups will be added in the future.

Additionally, it also provides multiple methods for computing land surface emissivity. It is targeted towards supporting research and science workflows in many fields including climate science, earth sciences, remote sensing, space tech, geospatial data science, environmental studies, among others.

Installation

The pylandtemp Python package is available through PyPI:

pip install pylandtemp

Documentation

The pylandtemp Python library is divided into multiple methods which provide access to set of algorithms for different computations.

• Land surface temperature

  • Single-Channel: through the single_window() method
  • Split window: through the split_window() method

• Land surface emissivity

  • Through the emmissivity() method.

• Brightness temperature

  • Through the brightness_temperature() method.

• Normalized Difference Vegetation Index (NDVI)

  • Through the ndvi() method.

Example

To compute land surface temperature using Jiminez-Munoz et al. (2014) split window technique and Ugur Avdan et al. (2014) emissivity computation method, a simple implementation is shown below:

import numpy as np
from pylandtemp import split_window

# lst_method and emissivity_method should point to keys of chosen -
# algorithms for temeprature and emmisivity, respectively

# Keys for available algorithms are presented in the next section

# tempImage10 is a numpy array of band 10 brightness temperature 
# tempImage11 is a numpy array of band 10 brightness temperature 
# redImage is a numpy array of the red band
# nirImage is a numpy array of the near infra-red (NIR) band

lst_image_split_window = split_window(
    tempImage10, 
    tempImage11, 
    redImage, 
    nirImage, 
    lst_method='jiminez-munoz', 
    emissivity_method='avdan',
    unit='celcius'
)

# The function returns a numpy array which is the land surface temperature image.

Supported algorithms and their reference keys

Land surface temperature --- Split window

Algorithm	key
Jiminez-Munoz et al. (2014)	'jiminez-munoz'
Sobrino et al. (1993)	'sobrino-1993'
Kerr et al. (1992)	'kerr'
McMillin et al. (1975)	'mc-millin'
Price (1984)	'price'

Land surface temperature --- Single-Channel

Algorithm	key
Ugur Avdan et al. (2014)	'mono-window'

Land surface emissivity

Algorithm	key
Gopinadh Rongali et al. (2018)	'gopinadh'
Ugur Avdan et al. (2014)	'avdan'
Xiaolei Yu et al. (2014)	'xiaolei'

Tutorials

The notebooks here are tutorials on how to use pylandtemp package.

Contributing

Open source thrives on collaborations and contributions. Let us work on this package in the same spirit.

If you catch any bug, find any typo or have any suggestions that will make this package better,

If you have a suggestion that would make this better, please fork the repo and create a pull request. You can also simply open an issue with the tag "enhancement". Don't forget to give the project a star! Thanks again!

Fork the Project Create your Feature Branch (git checkout -b feature/AmazingFeature) Commit your Changes (git commit -m 'Add some AmazingFeature') Push to the Branch (git push origin feature/AmazingFeature) Open a Pull Request

What's new

• September 2022: Started to work on intergrating with with google Earth Engine to pull data directly and automate the workflow.
• July 2022: Poster presentation of this project at Scipy 2022. Link here
• December 2021: version 0.0.1-alpha.1 pre-release version is out on PyPI. Find it here
• December 2021: Implemented tutorial notebooks based on the different methods. Find them here
• November 2021: Implemented a runner for dynamic dispatch.

Code license

The code of this library is available under the Apache 2.0 license.

Sponsor

• GitHub

How to cite

Mudele, O., (2021). pylandtemp: A Python package for computing land surface 
temperature from Landsat satellite imagery. GitHub: https://github.com/pylandtemp/pylandtemp.

If preferred, here is the BibTex:

@Misc{pylandtemp,
author = {Oladimeji Mudele},
title =        {pylandtemp: A Python package for computing land surface temperature from Landsat satellite imagery},
howpublished = {GitHub},
year =         {2021},
url =          {https://github.com/pylandtemp/pylandtemp}
}