Want to become GIS expert: Master these 20 Essential GIS Skills.

Background This article is inspired by a book by Gina Clemmer, “The GIS 20 Essential Skills” published by ESRI in 2017. This book offers an activation code for free GIS trail for 180-days, so it’s worth buying this book. First thing first, you need to have basic knowledge on GIS in order to learn theseContinue reading “Want to become GIS expert: Master these 20 Essential GIS Skills.”

What are the similarities and differences between Shapefile and Feature Class?

It has always been a popular question – What are the differences between shapefile and feature class? Here, are differences and similarities between Shapefiles and Feature class. What are feature classes? A feature class is a collection of geographic features that share the same geometry type (such as point, line, or polygon) and the sameContinue reading “What are the similarities and differences between Shapefile and Feature Class?”

What are Shapefiles?

Definition Shapefiles are spaghetti data models containing a features class composed of points, lines, or polygons, but never a mixture. The attributes are stored in dBase file. Shapefiles can store multipart features, in which a single feature includes multiple objects. Shapefile components and file extensions Shapefiles are stored in three or more files that allContinue reading “What are Shapefiles?”

What are Feature Classes?

Definition A feature class is a collection of geographic features that share the same geometry type (such as point, line, or polygon) and the same attribute fields for a common area. Examples: streets, well points, parcels, soil types, and census tracts etc. A feature class can contain only one kind of geometry—point, line, or polygonContinue reading “What are Feature Classes?”

What is an Atmospheric Correction and why is it necessary?

What is an Atmospheric Correction? As name suggest, atmospheric correction is the process of removing the effects of the atmosphere on the reflectance values of remotely sensed images. The atmospheric effects may be referred to as presence of gas absorption, molecule and aerosol scattering that can influence incident and reflected radiation the atmosphere can haveContinue reading “What is an Atmospheric Correction and why is it necessary?”

Important Sites to Download Freely Available GIS Datasets – In the USA

Forewords As a researcher, it is always troublesome to find right datasets for right projects. It could be more infuriating when you lose the websites that you’ve been downloading the data from. The best idea is to bookmark the important websites so that you will never loose them. Check these websites to “Download GIS Data byContinue reading “Important Sites to Download Freely Available GIS Datasets – In the USA”

Important Sites to Download Freely Available GIS Data-sets Across the World!

As a researcher, it is always troublesome to find right datasets for right projects. It could be more infuriating when you lose the websites that you’ve been downloading the data from. The best idea is to bookmark the important websites so that you will never loose them. Check these websites to “Download GIS Data- Global”Continue reading “Important Sites to Download Freely Available GIS Data-sets Across the World!”

What is the importance of GIS (Geographic Information Science) in Remote Sensing?

Remote Sensing and GIS are two different terms however, people seem to have used them interchangeably. Remote Sensing is a field which deals with acquiring, interpreting, and analyzing remotely sensed imagery particularly Landsat, MODIS, Sentinel, or even Lidar data whereas GIS is a tool that helps in this process. Before learning the importance of GISContinue reading “What is the importance of GIS (Geographic Information Science) in Remote Sensing?”

What are the differences between Geographic and Projected Coordinate Systems?

Before we jump into the differences between Geographic and Projected Coordinate Systems, let’s learn about coordinate systems. Coordinate System In general term, A coordinate system is a method for identifying the location of a point on the earth. The coordinate systems use two numbers— (x and y) or (latitude and longitude) commonly known as aContinue reading “What are the differences between Geographic and Projected Coordinate Systems?”

Landsat 8: A General Introduction

General Information NASA in collaboration with the U.S. Geological Survey (USGS) developed and launched Landsat 8 on February 11, 2013, from Vandenberg Air Force Base, California, on an Atlas-V 401 rocket. The design, construction, launch, and on-orbit calibration phases were led by NASA. The satellite then was called the Landsat Data Continuity Mission (LDCM). ItContinue reading “Landsat 8: A General Introduction”

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