Landsat 8 is an Earth observation satellite built, launched and operated by a collaboration of NASA and USGS. Data survey is performed by two main sensors which are adjusted into prescribed bands. The satellite operates in visible light, near InfraRed; ShortWave InfraRed to Thermal (LongWave) infrared. The bands are pre-set to 11 bands in total differed by the wavelength of their vision.

High-resolution imagery from a trusted provider has always been of a great demand due to the highest detail and accuracy it offers as well as an unlimited scope of the fields it could be applied. One could hardly find a better source of data when it comes to an in-depth analysis of the area, as it provides an unrivaled frequency and enhanced characteristics.

Change Detection is designed to compare the spatial representation of two points in time and measure changes caused by differences in the variables of interest.

Are you running a satellite images search to look at a city district? Or an agricultural field whose geographic coordinates you’ve captured with a smartphone? Or do you need an image of an uncharted iron mine that can’t be found on a map?

Latest satellite imagery is the most sought-after data right now, but historical satellite images are the ones you need to see how a site has changed over time. And the good news is that millions of archived satellite images of nearly any place on Earth can be accessed free on the Internet.

We live in a wonderful era when absolutely anyone can access the latest free satellite images of Earth; it only takes to know where you can find them. Our best seven free GIS data sources list will make it easier to decide which of the available web services has the data you need.