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Apr
26
comment Weird google streetview issue
I don't see any attached picture.
Mar
10
comment Interpreting Moran's I results
Oh I see you said the p-value is 0 - yes in that case you would reject the null that there is no spatial auto-correlation.
Mar
10
comment Interpreting Moran's I results
It depend's on what the standard error of the test statistic is @Konrad. But yes you interpret it like any other hypothesis test. I'm not quite sure what is a "formal" way of reporting it. Stating the observed test statistic, the standard error, and the null in a sentence like you just did is fine.
Mar
9
revised Great circles path not curved (in R)? Conventions and convertions problems?
added example plot showing second line is not straight
Mar
9
comment Great circles path not curved (in R)? Conventions and convertions problems?
It appears straight on the map because it is so zoomed out. If you shift it down one degree it becomes more clear that it is not a straight line. Line2 <- gcIntermediate(c(150,0.2210643-1),c(-50,-0.3972554-1),n=5, addStartEnd=TRUE);points(Line2,col='blue',pch=".",cex=10) If you simply do plot(inter_c2) you can clearly see it is not a straight line.
Mar
9
comment Great circles path not curved (in R)? Conventions and convertions problems?
The great circle line cuts the sphere in half - nicely illustrated by Wikipedia.
Mar
9
comment Great circles path not curved (in R)? Conventions and convertions problems?
Yes, except the second bird does not have to fly exactly east-west for the line to be curved, and if the east-west bird follows the line of the equator it will be straight as well.
Mar
9
answered Great circles path not curved (in R)? Conventions and convertions problems?
Nov
25
comment Extremely high z-values for Moran's I
What exactly is the z-score? Is it the Moran's Index column divided by the variance column? I presume you have a very large sample size, so the variance is very small, causing the extreme values. The z-score does not directly correspond to the strength of the auto-correlation (the Moran's Index column), which is plain to see by your table.
Nov
10
awarded  Announcer
Sep
21
comment Kernel Density Estimation Crimestat
blord-castillo makes a great point, and this can be implemented in CrimeStat. Also as an FYI CrimeStat can export rasters, such as ASC or GRD files.
Sep
2
awarded  Yearling
Aug
26
awarded  Good Answer
Mar
5
reviewed Approve calculate the population inside a buffer with census data
Mar
5
comment calculate the population inside a buffer with census data
This is sometimes called areal allocation. I have a description of doing it in another answer (I'm sure there are others floating around this site as well.)
Feb
24
comment R function for Thiessen Polygons
I had a script saved to create an sp object using a tesselation from the spatstat package. See here for your example points. I'm pretty sure spatstat just uses the same deldir library, but I'm lazy and couldn't figure out how to edit the functions to get them to work directly with the tile list from deldir in a quick attempt.
Dec
7
awarded  Nice Answer
Nov
13
answered What are good colour schemes for large density flow maps?
Oct
28
awarded  Popular Question
Oct
27
awarded  Notable Question