May 2017 - GIS Geography

Polar Orbit vs Sun Synchronous Orbit

A polar orbit satellite travels pole-to-pole. For a sun-synchronous orbit, it passes over any given point on Earth’s surface at the same local solar time.

OBIA – Object-Based Image Analysis (GEOBIA) – Think Objects, Not Pixels

Object-based Image Analysis (OBIA) segments an image by grouping pixels together into vector objects. Using these objects, you classify as land cover types.

ndvi united states - normalized difference vegetation index

What is NDVI (Normalized Difference Vegetation Index)?

NDVI quantifies vegetation with the difference between near-infrared (which is reflected by vegetation) and red light (which is absorbed by vegetation).

What is Georeferencing? How to Georeference Anything

Learn how to georeference with precision in this georeferencing guide. Add control points in two images, select a transformation and check your RMSE.

What is GIScience (Geographic Information Science)?

While Geographic Information Systems answers “what” and “where”, Geographic Information Science (GIScience) is concerned with the “how” and its development.

Month: May 2017

Polar Orbit vs Sun Synchronous Orbit

OBIA – Object-Based Image Analysis (GEOBIA) – Think Objects, Not Pixels

What is NDVI (Normalized Difference Vegetation Index)?

What is Georeferencing? How to Georeference Anything

What is GIScience (Geographic Information Science)?

13 Free GIS Software Options: Map the World in Open Source