# spatial analysis

1. ### Population density variations across countries

Hello, I am facing a problem for an independent variable for subnational population density in a view to make cross-national analysis across countries. My problem is that I have in my dataset some very densely populated metropolitan areas categorized as a region and great variability in my...
2. ### Which approach to evaluate small spatial variations in temperature?

I am evaluating whether utility-scale solar energy plants affect the surrounding climate (initially temperature). An effect has been found in one paper using the approach described below/attached but when repeating this approach I find no effect for the same site. I want to be sure that there...
3. ### Variance of a sum of predictions

Hi, I predict the spatial distribution of a species on a regular grid using a regression model. Species numbers vary with environmental covariates. Now I want to predict the overall size of the population within a given area, which means technically that I sum up all predicted values. But...
4. ### Specifying the initial values of likfit function of geodata in R

I have a geostatistical data. For analysis, I am using geoR. I want to estimate the parameters. But likfit or variofit function requires initial values for the covariance parameters: \sigma^2 (partial sill) and \phi (range parameter). But I can't guess the initial values for my data...
5. ### Is Sea Level Rise Data from NOAA an Areal Data?

I am working on sea level rise and I collected the data from NOAA. In the "meta", they describe the data is obtained by : Hourly : three-point Hanning filter centered on the hour Daily : 119-point convolution filter (Bloomfield, 1976) centered on noon applied to the hourly data with...
6. ### Newbie from Sacramento

Hi all, I'm the new guy on the forums. I have been "lurking" for a week or two and decided I should introduce myself. I'm a Econ major by training (go Sac State!), but the majority of my work involves Geographic Information Systems and Spatial Databases. I've been a "passive" user of R and the...
7. ### Spatial distribution of points

Hi, I'm working on spatial distribution of points (being location of volcanoes). I found so far a linear correlation between the mean distance between nearest neighbours and the density in a semi-log plot. I'm looking for ideas and ways to study these fields of points/volcanoes. Cheers...
8. ### Urgent indicator semivariogram problem

Hello. I'm trying to create an spatial indicator semivariogram (variables transformed to 0 and 1), but i got the same graph for both. i'm using gslib and i think to have put the right parameters (the 2 thresholds 0, 1), I think it's a matter of concepts (i'm a beginner). I have tried many...