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However, because it has a large angular diameter, the full moon is the brightest celestial object in the night sky. The lunar surface is relatively non-reflective, with a reflectance just slightly brighter than that of worn asphalt. Most of the large impact basins and mare surfaces were in place by the end of the Imbrian period, some three billion years ago. The near side of the Moon is marked by dark volcanic maria ('seas'), which fill the spaces between bright ancient crustal highlands and prominent impact craters. It then receded to a wider orbit because of tidal interaction with the Earth. The most widely accepted origin explanation posits that the Moon formed about 4.51 billion years ago, not long after Earth, out of the debris from a giant impact between the planet and a hypothesized Mars-sized body called Theia. That said, 59% of the total lunar surface can be seen from Earth through shifts in perspective due to libration. The Moon is tidally locked to Earth, which means that the length of a full rotation of the Moon on its own axis causes its same side ( the near side) to always face Earth, and the somewhat longer lunar day is the same as the synodic period. During each synodic period of 29.5 days, the amount of visible surface illuminated by the Sun varies from none up to 100%, resulting in lunar phases that form the basis for the months of a lunar calendar. The Moon's orbit around Earth has a sidereal period of 27.3 days.

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Orbiting Earth at an average distance of 384,400 km (238,900 mi), or about 30 times Earth's diameter, its gravitational influence very slowly lengthens Earth's day and is the main driver of Earth's tides. Its surface gravity is about one-sixth of Earth's ( 0.1654 g) Jupiter's moon Io is the only satellite in the Solar System known to have a higher surface gravity and density. It lacks any significant atmosphere, hydrosphere, or magnetic field. The Moon is a planetary-mass object that formed a differentiated rocky body, making it a satellite planet under the geophysical definitions of the term. At about one-quarter the diameter of Earth (comparable to the width of Australia), it is the largest natural satellite in the Solar System relative to the size of a major planet, the fifth largest satellite in the Solar System overall, and larger than any known dwarf planet. By completing the fourth class you will gain the skills needed to succeed in the Specialization capstone.The Moon is Earth's only natural satellite. You should have equivalent experience to completing the first, second, and third courses in this specialization, 'Fundamentals of GIS,' 'GIS Data Formats, Design, and Quality', and 'Geospatial and Environmental Analysis,' respectively, before taking this course. Take Geospatial and Environmental Analysis as a standalone course or as part of the Geographic Information Systems (GIS) Specialization. Finally, we'll wrap up by talking about a few more things that you might want to explore more as you start working on learning about GIS topics on your own. Week 4: We'll begin the final week by talking about a few spatial analyst tools we haven't yet touched on in the specialization: Region Group to make our own zones, Focal Statistics to smooth a hillshade, Reclassify to change values, and Point Density to create a density surface. We'll also go through a few common algorithms including a very important one: the suitability analysis. Week 3: In week three, we'll make and use digital elevation models using some new, specific tools such as the cut fill tool, hillshades, viewsheds and more. We'll also explore a few topics that we don't really have time to discuss in detail, but might whet your appetite for future learning in other avenues: geocoding, time-enabled data, spatial statistics, and ArcGIS Pro.

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Week 2: You'll learn how to use ModelBuilder to create large processing workflows that use parameters, preconditions, variables, and a new set of tools.

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At the end of this week, you'll be able to find and download satellite imagery online and use it for two common types of analysis: NDVI and trained classification. Week 1: You'll learn all about remotely sensed and satellite imagery, and be introduced to the electromagnetic spectrum. In this class you will become comfortable with spatial analysis and applications within GIS during four week-long modules: Using the knowledge you’ve learned about ArcGIS, complete technical tasks such raster calculations and suitability analysis. Welcome to the last course of the specialization (unless your continuing on to the capstone project, of course!).

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