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 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?”

What are the differences between Geocoding and Geo-referencing?

Geo-Coding When you type an address or a place name in the search box and in return the map shows a marker at the place. The process of associating an address or a place name with coordinates on the map is called Geocoding. In a spatial database this is done as a point layer with nameContinue reading “What are the differences between Geocoding and Geo-referencing?”

What are the differences between Project Tool and Define Projection?

Project Tools -acts on x-y coordinate of a layer and converts them to a different coordinate system, producing a new feature class and leaving the original feature class unchanged. -convert a layer in one coordinate system to another -should be used only on layers that already work properly and appear in the right location. DefineContinue reading “What are the differences between Project Tool and Define Projection?”

World Map – Night View

Quick Overview Ever wondered how the planet earth would look like at night? Ever wondered how to map the physical features across the world? Here is your answer. In this work I have tried to map the night view of the earth. In addition, I have mapped artificial features including airports, road network, railroad network,Continue reading “World Map – Night View”

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