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Pansharpen images

How to pansharpen the geospatial outputs using the UP42 platform and QGIS.


Introduction

In this article, you will learn how to pansharpen geospatial datasets that you previously purchased either through the UP42 data platform (collections, catalog or tasking orders) or the UP42 processing platform (data blocks).

Pansharpening is a remote sensing algorithm that uses a higher-resolution panchromatic image to fuse with the lower-resolution multiband image. This outputs a multiband image with the spatial resolution of the panchromatic image.

This transformation is widely used, because geospatial data producers frequently provide low-resolution multiband images and higher-resolution panchromatic images of the same scene. Increasing the spatial resolution with the help of pansharpening provides a better visualization of the multiband image.

Currently, you can apply pansharpening directly on the UP42 platform or in third-party GIS software. In this guide, the following pansharpening tools are described: the processing block Pansharpening and the function GDAL Pansharpening available in the free software QGIS.

Pansharpen with UP42

Steps

In order to apply pansharpening on the UP42 platform, please follow the steps below:

  1. Create a new workflow by adding one of the compatible data blocks and then add the processing block Pansharpening.

  2. Click Save & Configure Job.

create workflow pansharpening
Create a workflow

  1. In the job configuration window, find the parameter method and select the preferred pansharpening method: Brovey, Esri or SFIM.

  2. Select the job type Live Job and click on Run Job.

run job pansharpening
Configure and run a job

  1. You are redirected to the dashboard of your job that is currently running. Wait until the job run is successful.

  2. Download the pansharpened image output.

download outputs pansharpening
Download the pansharpened output

  1. Render the pansharpened image output in a third-party GIS software. For more information, please refer to Visualize the outputs.

Example

A workflow that contains the data block Pléiades Reflectance (Download) and the processing block Pansharpening:

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Pansharpen with QGIS

Requirements

In this section, you will learn how to apply pansharpening using the function GDAL Pansharpening available in the free software QGIS.

We expect users to be familiar with opening geospatial data. To get started with QGIS, we recommend reading the QGIS documentation.

Steps

In order to apply pansharpening in QGIS, please follow the steps below:

  1. a) If you have geospatial datasets already delivered to storage through job runs or data ordering (collections, catalog or tasking orders), go to Storage and download the assets locally.

    b) If you do not have geospatial datasets delivered to storage, then follow the steps from the previous section Pansharpen with UP42.

  2. Open QGIS.

  3. Create a new project.

qgis new project
Create new project

  1. Drag and drop the multispectral band and the panchromatic band.

qgis multispectral band
Multispectral band

qgis panchromatic band
Panchromatic band

  1. Go to the tab Processing > Toolbox. A toolbox panel appears on the right side.

  2. Type in Pansharpening and click on the function provided by GDAL.

qgis pansharpening
Pansharpening function

  1. A new window appears. Select the correct images for both the spectral and the panchromatic datasets. For Pléiades and SPOT 6/7 satellite images, the filenames usually indicate the image type (MS for multispectral and P for panchromatic).

  2. Click on Run.

qgis pansharpening window
Pansharpening window

  1. The pansharpened image will automatically be displayed as a new layer in your QGIS project.

qgis pansharpened result
Pansharpened result