GIS

Applications of GIS in Agriculture

Increasing interest in Remote Sensing and advancement in the GIS technology has open gateways to various researches—agriculture being one of them. The easy viability of hyperspectral images (thanks to USGS EROS Center) and the enthusiasm of the scientists in using their expertise interpreting and analyzing these images to produce robust, sensible, and understandable products has …

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What is an Accuracy Assessment? Why is it necessary?

Introduction The application of GIS in Remote Sensing, particularly the land cover classification has contributed a lot in the scientific community (read: What is the importance of GIS (Geographic Information Science) in Remote Sensing?) and at the same time has led to the need for accuracy assessment of the products because most scientists believe that …

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What is a Map Projection? What are different Map Projections used in GIS?

Earth is a spherical (not exactly but let’s consider!) surface. This spherical surface is also termed as spheroid or ellipsoid. It has always been a challenging job to specify the location and shape of a particular feature on the earth surface. In order to solve this issues the geographer and cartographer came up with an …

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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 all …

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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 have …

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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 by …

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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” …

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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 GIS …

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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 a …

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