Latest Contributions by BankimYadav

Error arises on clicking the .exe file. The dialog box says "An unexpected error while unpacking files. Error code:  -2147467259 ". File name is "ArcGISPro_26_175036.exe" ... View more

Problem: My study area is a simple rectangular polygon in which the sampled points are spread inside. The extent of this polygon is obviously greater than the extent of the bounding box of input points. Now, the Geostatistical Wizard does not honor the (extent) environment settings. Also, Kriging is not given as an independent tool in the GA toolbox which can be supplied with the extent environment settings. As much as I know, only the wizard can do together (a) data transformations, (b) semivariogram modelling, and (c) neighbourhood parameterization, but it won't produce the result in the entire extent of the polygon! Alternative adopted: Added four points at the four corners of the study area polygon. I updated their z-values with the mean of the sampled points. This causes the wizard to produce output in the exact extent of the study area polygon.  The interpolation in the new 'extra region' would have used data from the sampled points and these 4 extra points.  Discussion: Is the above method a good alternative to the environment settings problem? I believe that a lot of users would come across this problem because a lot of times the output extent would be bigger than the sampling extent. Regarding the use of spatial analyst kriging tool, there's the only the option of simple and ordinary kriging and the tool is less flexible than the GA one. Is there a workflow of tools available to perform the above kriging job? Please enrich my knowledge.  ... View more

As I have read about some threads in Geostatistical Analyst that there are no definitive rules about choosing the right neighborhood size but the bad ones are like choosing the radius more than half of the range of semivariogram.  So, I have decided the parameters of first part i.e. Semivariogram modelling: Lag size = SET (using 'Avg Neighbourhood Distance' tool from Spatial Analyst, and following the rule that lag size * no. of lags = 0.5 * (max distance between input points))  Lag no. = SET (as in point 1) Anisotropy = ON  (as I can see that the sill is approached rapidly in one direction than the others)  Model = 'Stable' (subject to change)  Nugget = 'OFF' (due to poor cross-validation stats with Nugget = 'ON')  So, now in the second part i.e. Prediction, I have set some parameters with confidence but have confusion in some: Number of neighbors belongs to range [10, 32] The problem: If I set the 'copy parameters from semivariogram' to 'TRUE', the ellipse almost encompasses the study region extent which I believe is a bit weird. But, if I set its flag to 'FALSE' and set the major and minor axis myself, would that nullify the effect of semivariogram modelling? If yes or not, please provide me some recommendations about the neighborhood size as also seen in the images below.  Eric Krause‌  Image 1 - Semivariogram modelling parameters, Image 2 - the big search radius.   ... View more