Skip to main content

Unpack Landsat-8 BQA band into individual layers and create a composite image of each quality indicator.

Project description

Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means.

In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain. We make this dedication for the benefit of the public at large and to the detriment of our heirs and successors. We intend this dedication to be an overt act of relinquishment in perpetuity of all present and future rights to this software under copyright law.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

For more information, please refer to <http://unlicense.org/> Description: ## Background

Landsat-8 Level 1 scenes come with a quality assessment band (BQA) that shows various forms of atmospheric and other interference present in the image.

The accompanying BQA file is a GeoTIFF with bit-packed values corresponding to an internal USGS numbering scheme. You can learn about these values and the BQA band in general by reading the USGS overview located [here](https://www.usgs.gov/land-resources/nli/landsat/landsat-collection-1-level-1-quality-assessment-band?qt-science_support_page_related_con=0#qt-science_support_page_related_con). There is also a more in-depth PDF titled ‘Landsat Quality Assessment (QA) Tools User’s Guide’.

## Usage

This CLI tool may be useful to you if you are working with Landsat-8 quality assessment data in Python 3.

This tool is written to search the directory where it is run, and all sub-directories for Landsat-8 BQA bands. It then ‘unpacks’ the bit packed BQA raster and creates a new GeoTIFF for each USGS quality measure that the user specifies. Finally, the tool takes the new quality bands for each scene and creates a composite image stack for each quality control measure.

For example, you can take a directory of Landsat-8 scenes, pull out all cloudy pixels, and create a composite image showing all cloudy pixels in the stack.

This is helpful for time series analysis because you can identify atmospheric interference over time.

Flags correspond to each quality assessment layer identified by USGS. The following will produce individual BQA band files for every quality assessment type identified by USGS and then build composites from each quality assessment type.

`commandline cd /filepath/to/top_dir_for_landsat_scenes landsat_L1_qa_tool -c -f -t -r -cl -cc -cs -ci -s `

Quality assessment types: `commandline -c --clear-terrain -f --fill -t --terrain-occlusion -r --radiometric-saturation -cl --clouds -cc --cloud-confidence -cs --cloud-shadow -ci --cirrus -s --snow-ice `

## Other Tools

Other great tools exist, and are more comprehensive.

-USGS has several offerings [here](https://www.usgs.gov/land-resources/nli/landsat/landsat-quality-assessment-tools).

-USGS EROS offers [landsat-qa-arcgis-toolbox](https://github.com/USGS-EROS/landsat-qa-arcgis-toolbox), [espa-science-validation](https://github.com/USGS-EROS/espa-science-validation), and [espa-l2qa-tools](https://github.com/USGS-EROS/espa-l2qa-tools).

-Rasterio’s Landsat-8 QA tools is [here](https://github.com/mapbox/rio-l8qa).

Platform: UNKNOWN Classifier: Programming Language :: Python :: 3 Classifier: License :: Unlicense Classifier: Topic :: Landsat :: data conversion Description-Content-Type: text/markdown

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Files for landsat-L1-qa-tool, version 0.1.2
Filename, size File type Python version Upload date Hashes
Filename, size landsat_L1_qa_tool-0.1.2-py3-none-any.whl (7.3 kB) File type Wheel Python version py3 Upload date Hashes View
Filename, size landsat_L1_qa_tool-0.1.2.tar.gz (6.0 kB) File type Source Python version None Upload date Hashes View

Supported by

Pingdom Pingdom Monitoring Google Google Object Storage and Download Analytics Sentry Sentry Error logging AWS AWS Cloud computing DataDog DataDog Monitoring Fastly Fastly CDN DigiCert DigiCert EV certificate StatusPage StatusPage Status page