Uzzal Dash

8 Questions 13 Answers 0 Followers

Questions related from Uzzal Dash

Why the range of variogram is greater than the diameter of the study area?

I plotted a variogram for a dataset which contain 83 observation sites. The maximum distance between the observation points is 60 km but i got the range of the variogram is 261 km. What does it...

11 June 2016 9,623 11 View

Why should data follow normal distribution for ordinary kriging analysis?

I have a dataset contains hourly PM10 concentrations for 1 hour of 83 sites. . I want to plot semi-variogram for this dataset then subsequent ordinary kriging analysis and cross validation. As far...

03 February 2016 6,931 8 View

Whats the unit of semivariance?

The unit of my data is µg/m3. With these data I have plotted semivariogram. Then What would be the unit of semivariance in this case, (µg/m3 )2or µg2/m3 ?If the unit is (µg/m3 )2 then how should...

23 January 2016 2,431 4 View

Which statistical parameters I should check after cross validation for Ordinary Kriging Interpolation?

I am doing Ordinary Kriging analysis on PM10 (air pollutants) concentrations dataset. This dataset contains hourly PM10 concentrations of 3 months (3X30X24) for 83 observation stations. Minimum...

05 January 2016 4,479 11 View

What can I do when location is not the only predictor during ordinery kriging prediction?

I am trying to perform ordinary Kriging using gstat package on a hourly particulate matter(PM) concentration dataset. my dataset contains PM concentration for 1 hour of 250 sites.After performing...

30 November 2015 2,154 7 View

Why the correlation coefficient between observed value and predicted value is low after cross validation[gstat-R]?

I am trying to perform ordinary Kriging using gstat package on a hourly particulate matter(PM) concentration dataset. my dataset contains PM concentration for 1 hour of 250 sites. After performing...

10 November 2015 2,641 10 View

How can I estimate the major axis and ratio values from directional variogram for modeling anisotropy?

I am new in kriging analysis. I am attaching a directional variogram produced by gstat package in R. Please take a look.I have plotted this directional variogram for PM10 data(particulate...

05 October 2015 1,185 14 View

How do I interpret range, sill and nugget of variograms?

I have a dataset contains hourly PM 10 concentration of 3 months of 107 sites. I have plotted all the hourly variogram (total 2208 variogram) and extracted a table of sill, range and nugget of...

15 September 2015 2,636 19 View