Landsat Missions

What could be causing the "seamline" in a mosaic of multiple images?

You are here

Question:

What could be causing the "seamline" in a mosaic of multiple images?

Answer:

In order to obtain a "seamless" mosaic, radiance (and preferably reflectance) may need to be calculated before performing the mosaic, because gain changes may occur in one or more of the scenes. When two scenes have different gain states, they have different dynamic ranges, and there will be a shift in Digital Number (DN) values from one scene to the next. This can be determined by reviewing the included metadata file for each scene.

Some imaging software packages have a utility that can automatically create the radiance image, based on the gain/bias in the header file. If this is not available, a manual "band math function" may be necessary.

Details about conversion to radiance and converting radiance to reflectance are provided in Sections 11.3.1 and 11.3.2 of the Landsat Data Users Handbook.

About

Landsat represents the world's longest continuously acquired collection of space-based moderate-resolution land remote sensing data. Four decades of imagery provides a unique resource for those who work in agriculture, geology, forestry, regional planning, education, mapping, and global change research. Landsat images are also invaluable for emergency response and disaster relief.

 

Contact Us

Landsat Updates

The Landsat Update is an informal communication tool, prepared periodically and distributed electronically to USGS Landsat partners, to provide information about Landsat activities and related topics of interest.

Accessibility FOIA Privacy Policies and Notices

USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: https://landsat.usgs.gov
Page Contact Information: Ask Landsat
Page Last Modified: 11/29/16 03:03 pm
Sitemap