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MODIS Image
Cofrin Center for Biodiversity

•  WORLDWIDE REFERENCE SYSTEMS 1 & 2  •

Imagery acquired on a particular satellite overflight at a particular place on earth is bundled into a data package called a "scene". The areal extent of a Landsat scene is about 200 km square and aligned with the orbital path of the satellite. The location of the scene on the earth's surface is defined by a pair of numbers. The path number indicates which of several hundred north to south tracks the satellite was on when the scene was acquired. The row number indicates how far south the satellite was when the scene was acquired. When the Federal Government is operating you can see the whole deal at the Global Visualization Viewer (GLOVIS).

Worldwide Reference System 1 aka WRS-1
WRS-1 is the tiling scheme used to locate and name imagery acquired by Landsat 1, Landsat 2 and Landsat 3.

Worldwide Reference System 2 aka WRS-2
WRS-2 is the tiling scheme used to locate and name imagery acquired by Landsat 4, Landsat 5, Landsat 7 and Landsat 8.