Sushanta Gupta

5 Questions 14 Answers 0 Followers

Questions related from Sushanta Gupta

How can I generate index using Erdas Imagine ?

I have calculated the reflectance value of Green, Blue, Red, NIR, SWIR1, and SWIR2. Now I have to generate an index using the formula SQRT[Red+Green+NIR]. I have used the model maker to generate...

28 September 2019 10,002 5 View

Which is the appropriate method for determining sample?

My questionnaire data is a combination of categorical data and continuous data. According to Cochran, the formula of measuring sample size varies with the data type. So, which formula should I use?

11 June 2017 9,679 6 View

Is the Landsat Images of USGS geometrically corrected? What is orthorectification?

I want to apply spectral mixture analysis method for estimating impervious surface. So, I have downloaded a Landsat Image from USGS earth explorer. When I add a shapefile and the image in...

25 June 2016 7,932 15 View

Can panchromatic image worldview 1 satellite be an alternative of DOQ?

A Digital Orthophoto Quadrangle (DOQ) is a computer-generated image of an aerial photograph in which the image displacement caused by terrain relief and camera tilt has been removed. The DOQ...

01 June 2016 9,989 2 View

How can I know the TOA reflectance value of a pixel in Erdas Imagine?

I have convert the DN Value to TOA refletance Value using Erdas Model Maker. Now I want to the reflectance value for each pixel? How can i know?

17 March 2015 3,833 6 View