Questions tagged [geostatistical-analyst]
Geostatistical Analyst is an ArcGIS for desktop extension, that provides a suite of tools for spatial data exploration and surface generation.
1
vote
0answers
14 views
Using convex hull for interpolation of individual plots or lump plots together in ArcMap?
This question is inspired by Using kriging to extrapolate values outside of sampling polygon in ArcMap?
I'm working on a project trying to understand the lasting effects of historic scientific ...
-1
votes
0answers
19 views
error in making voronoy diagram in r
I try to make Voronoy diagram in latitude/longitude cooredinates. Frist of all I made grid:
library(gstat)
library(sp)
longitude_for_data = c(32,68,89,145,176, -14, -42)
latitude_for_data = c(...
0
votes
0answers
7 views
Value changes while converting Geostatistical layer to grid using ArcGIS Geostatistical Analyst?
I'm trying to export the GA layer (krigging interpolated temperature data) to raster. While converting, the data range is getting changed in the resultant raster (max and min) as indicated in the ...
2
votes
2answers
289 views
Making data table using linear kriging interpolation with variogram in R
I have a table of data with such structure:
longitude_for_data = c(32,68,89,145,176, -14, -42)
latitude_for_data = c(22,98,21,13 , 16,-134,-102)
Z_for_data = c(30,40,60,70 , 20, 40, 100)...
1
vote
0answers
45 views
Error in Universal Kriging using gstat package in R [closed]
I am trying to perform universal kriging in R using the gstat package and running into the following error:
krige(formula = CDD_LT_stC ~ Imperv1km + Elev_new, locations = sp.cal_data, newdata = sp....
0
votes
1answer
70 views
Which is the model semivariogram for binary data?
I have a binary data (1,0) to calculate spatial distribution of soil bacteria. I have to use indicator kriging (presence/absence) and fitting model of semivariogram. Then, which is the model ...
2
votes
1answer
167 views
What is a relevant geospatial modelling approach when no spatial autocorrelation is found?
Although I have found on StackOverflow all answers I ever had on GIS matters using R, ArcGIS and QGIS in the past, I am currently faced with one question I can't find an answer to online.
For my ...
1
vote
1answer
30 views
geostatistics across different projections?
What are some best practices for calculating local geostatistics across the boundaries of different projections?
I am thinking of using the State Plane Coordinate System to represent a national-...
2
votes
1answer
127 views
Kernel Interpolation with Barrier
I am trying to use the 'kernel interpolation with barriers' tool in the Geostatistical Analyst toolbox of ArcGIS 10.3. My data consists of 600 marine animal relocations, and I am trying to calculate ...
3
votes
1answer
298 views
kriging vs cokriging
I am attempting to interpolate sediments across an area with data from 3 sources using ArcGIS 10.3.
All three sources divide sediments into percentages of mud, sand or gravel.
Two sources come ...
5
votes
3answers
698 views
Finding the average value from polygon areas in a fishnet cell
I am looking to assign depth values to each fishnet grid cell that I have by taking the area-weighted average of values from a contour/isopach map.
The map was interpolating using the depths of ...
0
votes
1answer
159 views
Surface analysis with R - Shape recognition
I am trying to analyse a geological surface with R & Python and I would like to know if there are some ways to distinguish, divide and quantify repetitive structures such as advertised by a ...
2
votes
0answers
56 views
How to create a surface area that interpolates and visualizes trends in physical activity in ArcGIS?
I have a dataset that contains several hundred telemetry points for my focal species around twilight hours. Attached to these points are mean values that represent how active the animal was 10 ...
1
vote
0answers
40 views
Rule of Thumb for setting smoothing parameter
I'm trying to model some binary data (disease infections) using indicator kriging in the Geostatistical Wizard in Arc 10.3. For presentation purposes I'm using the smoothing option. Is there a rule of ...
1
vote
0answers
104 views
How to test for correlation between two point data sets
I want to determine if there is a correlation between weed plant species density and habitation (buildings).
Both data sets are points. The weed species has an 'abundance value' (i.e., one point may ...
0
votes
1answer
592 views
Geostatistical Analyst toolbar options not accessible
I am trying to perform cross-validation for a Kriging interpolation I did on my dataset. For this I wanted to use the Geostatistical Analyst Wizard in ArcGIS Desktop.
I have the Geostatistical ...
1
vote
0answers
109 views
Converting raster into geostatistical layer? [closed]
I have downloaded a raster surface (SRTM) with pixel size equals to 30*30, and I want to use that surface as a geostatistical layer for further analysis. Is there any available tool that converts ...
2
votes
2answers
187 views
What does 'Weight Field' in IDW interpolation mean?
I am trying to figure out how the Weight Field option of Geostatistical Analyst IDW in ArcMap 10.3 works.
On IDW - ArcGIS Desktop Help I can find just this simple explanation:
Used to emphasize ...
1
vote
0answers
57 views
Cross-validation error threshold in ArcGIS
I'm learning the Geostatistical Wizard toolset in ArcMap 10.4.1 and I am performing the cross-validation step in an IDW interpolation.
I have done some research regarding the process of cross-...
0
votes
2answers
2k views
Create groundwater contours in ArcGIS
I'm trying to determine a way to accurately produce groundwater contours in ArcGIS. The industry standard is using Surfer to construct the contours from monitoring well data. I would imagine ArcGIS ...
1
vote
1answer
148 views
Kriging predictions for presence only data with Maxent
I was doing some geostatistical analysis (variogram+kriging) for a "presence only" type data in a species distribution modeling context. Since, we know that when estimating the (empirical) variogram, ...
1
vote
1answer
115 views
Areal Interpolation - Error 40066 - cannot distinguish between polygons
I have data for some countries but not for others and would like to predict the missing values from neighboring countries weighted by their area, distance etc.
To do so, I am using the geostatistical ...
2
votes
1answer
79 views
Creating subset for doing Co-Kriging interpolation and Crossvalidation?
I have a data set with only 47 soundings, so a small amount of data available. With this information I am trying to produce a raster surface through interpolation. Unfortunately, a data analysis ...
1
vote
0answers
201 views
Land cover generation
I am working on a river watershed on QGIS and I need a land cover map.
I have a good raster of land use data with 15 m resolution for year 2015, but it covers around the 90 % of the basin.
I have ...
2
votes
0answers
94 views
Sample Design for Kriging [closed]
I am taking soil samples on an agricultural plot and will be using the results as input to create a semivariogram for kriging in ArcGIS. This plot features raised planting beds in which the test crop ...
1
vote
0answers
212 views
Understanding semivariogram model in ArcGIS; difference between Binned points and Average points?
I am sorry if I am unaware of some very basic ideas of semivariogram. I am trying to understand the difference between binned points and averaged points. In this [document] (http://desktop.arcgis.com/...
3
votes
1answer
388 views
Ordinary kriging problem after exporting to raster (Geostatistical Wizard)
I'm not sure what I'm making wrong. I used the Geostatistical Wizard to perform an ordinary kriging. The resulting Geostatistical Layer looks like this:
After using the GA Layer To Grid Tool by right ...
2
votes
0answers
71 views
Analysis method for Vegetation category change [closed]
I have a data set showing vegetation change over a 100 year period. The data is categorical (ie. Conifer, Deciduous, Mixedwood, Grassland, Shrub, Open Canopy forest, non vegetated). Each cell in my ...
2
votes
2answers
261 views
Getting similar IDW results using Spatial and Geostatistical Analysts for spatial interpolation of data with many zeros?
My data are plant biomass data from hundreds of sites. Most sites have zero biomass; these zeros are real. Thus, my data violate most assumptions of geostatistical interpolation methods (confirmed ...
3
votes
1answer
3k views
Doing spatial correlation between two layers on ArcGIS?
I have two datasets and I'm trying to determine the extent of their spatial relationship. I suspect they are closely related but I would like to produce a map output to illustrate this relationship.
...
1
vote
0answers
551 views
Calculate spatial GINI coefficient for land use
I am interested in calculating an index of agricultural land inequality for Brazil. I'm thinking that a GINI coefficient would be a good approach given traditional uses of GINI. I have a data set for ...
5
votes
1answer
163 views
Understanding ArcGIS Geostatistical kriging?
We use soil samples data for interpolating soil fertility parameters using ArcGIS geostatistical Kriging. While doing kriging, the resultant map values ranges are not matching with our input samples ...
2
votes
1answer
1k views
Difference between Spline (spatial analyst) and Geostatistical Analyst? [closed]
Why the interpolation result of Spline with Tension in the Spatial Analyst is different from the that in the Geostatistical Analyst (both in ArcGIS 10), including their minimum values, maximum values, ...
4
votes
1answer
501 views
Does IDW interpolation in ArcGIS Geostatistical analyst work as exact interpolation method?
As we know, Inverse distance weighted (IDW) is an exact interpolation method, which means the interpolated values of the known samples should be the same with its original observed values. But when I ...
2
votes
1answer
295 views
ArcGIS method for declustering a spatial dataset?
I have previously asked this question but perhaps was using the wrong terminology. I would like to run some type of cell declustering on a spatial dataset. Is there a tool for doing this in Arc? ...
1
vote
1answer
109 views
arcpy.SubsetFeatures_ga output not saving in correct feature dataset
I am using SubsetFeatures_ga to create a random dataset within a file geodatabase and am trying to save the output feature class in a feature dataset but it keeps getting saved in the root of the file ...
1
vote
1answer
1k views
Example of simple kriging with varying local means in R
I'm looking for an example of how to use simple kriging with varying local means in R.
I've tried google, a few books (for example Aplied Spatial Data Analysis with R) and I've found almost nothing. ...
1
vote
1answer
51 views
How to create dynamic point_coord variables for Neighborhood Selection?
I'd like to us the arcpy.GANeighborhoodSelection_ga in a loop where the point coords would come from a different source. What I tried already:
If I define the coords, it works:
pointcoord = "689383....
2
votes
2answers
683 views
Indicator Kriging and cokriging using ArcGIS Geostatistical Wizard?
I have a map of vegetation in 1913 for a particular landscape (approx 35,000ha), of which I have data for just short of 60% of the landscape. The limited visibility is due to the coverage being ...
3
votes
1answer
147 views
Cokriging using categorical covariables in ArcMap?
I am using cokriging to model a continuous variable across my study unit (soil carbon). I have one continuous covariable (soil moisture) but also a categorical covariable (vegetation community). I am ...
0
votes
1answer
51 views
Need to develop a model for measuring inter-annual and seasonal variability in pasture cover using modis 16 day composites
Aiming to use statistical methods in ArcGis and Envi image analysis to measure inter-annual and seasonal variability in paster cover using MODIS 16 day composite image from 2000-2014.
Quite stuck on ...
5
votes
1answer
94 views
Preparing data for semiovariogram analysis in ArcGIS with large sample sizes?
I am working on a statewide project to create surface water quality grids from point samples. In some instances, we have large sample sizes (n>50,000) which is problematic when creating ...
2
votes
0answers
242 views
kriging of compositional data (grain size)
I have posted this already in the GEONet Forum but without any suggestions, now I am hoping for some feedback here:
I have a problem concerning interpolation of compositional data of grain sizes. I ...
6
votes
1answer
900 views
Dealing with data which are not normally distributed when kriging?
I'm a novice with advanced spatial interpolation, and I'm trying to use the Geostatistical Analyst to interpolate a surface based on borehole data, using Ordinary Kriging.
The help file explains how ...
0
votes
1answer
560 views
Applying mask in ArcGIS Geostatistical IDW?
I'm finishing an analysis of approximately 850 archaeological assemblages in the Mediterranean, and I've successfully run IDW in Geostatistical toolbox (ArcGIS 10) to generate the results I like. I'm ...
2
votes
3answers
1k views
Is kriging an exact interpolation method?
Can kriging be an exact* method? For example, when optimized with the Geostatistical Wizard? Or in any other way? (as far as I know, "normal" kriging isn't an exact method).
*exact: predictions at ...
1
vote
0answers
828 views
Creating landslide susceptibility map using logistic regression and ArcGIS Desktop? [closed]
My project is to build a landslide susceptibility map using logistics regression. I have generated the following maps so far:
slope map, hill shade, curvature, elevation, road buffers, river buffers ...
2
votes
2answers
995 views
Geostatistical Analyst raster export looks completely different
I'm having trouble trying to re-create how a Kriged layer looks when interpolated using Geostatistical Analyst. I like the level of generalization (smoothness) of the filled contours in the "temporary"...
2
votes
1answer
464 views
Cross-validation and optimal p power in IDW
I use the "Geostatistical Wizard" in ArcMap 10 to do my interpolations. For example, when I do IDW and I want to decide for the optimal p power or the optimal number of neighbors that will contribute ...
6
votes
1answer
1k views
Classical or robust variogram for incorporation into generalized linear model
I'm modeling counts of organisms over time at eleven locations. I'd like to account for temporal autocorrelation in the counts, assuming it's present.
As the data are not equally spaced in time, I'...
