The field of study concerning statistical methods that use space and spatial relationships (such as distance, area, volume, length, height, orientation, centrality and/or other spatial characteristics of data) directly in their mathematical computations.
0
votes
1answer
9 views
What to do when raster cell size is larger than zonal vector feature in order to collect statistics?
I am trying to extract the mean cell values for a raster dataset based on a survey grid polygon feature using ArcINFO 10.4. The cell size of the raster dataset is about 4 times the size of the survey ...
3
votes
0answers
25 views
Ways to measure similarities/congruence of tracks (point features) in ArcGIS
I have a sets of GPS coordinates recorded while tracking different cross country runners. What I would like to do is to compare how similar the tracks of the individual runners are. Is there a test ...
0
votes
0answers
27 views
Explaining the output from ArcGIS' Principal Components tool
I have completed the process but am unsure whether I am interpreting the output like I should, particularly the text file. I am especially interested in the "EIGENVALUES AND EIGENVECTORS" portion.
22
votes
2answers
809 views
How can I conduct Geographically Weighted Principal Component Analysis using ArcGIS, Python and SPSS/R?
I am after a description/methodology for conducting a Geographically Weighted Principal Components Analysis (GWPCA). I am happy using Python for any portion of this and I imagine SPSS or R being used ...
1
vote
0answers
20 views
Calculate complete spatial randomness using Python [duplicate]
I currently use the csr() function from Splancs for R (http://cran.r-project.org/web/packages/splancs/splancs.pdf) to calculate complete spatial randomness (CSR) points to be used for spatial ...
10
votes
2answers
284 views
Regression Model and Spatial Autocorrelation
I have used OLS and GWR for validating the dependencies between two distinct database. The Residual Square for GWR is 0.82 and thereby making it the right regression model to be used for determining ...
2
votes
1answer
67 views
About regression analysis in arcgis
I'm trying to do regression analysis using a shapefile which contains dependent variable (NDVI) and explanatory variable (prec) in Arcgis. First, I run GWR analysis and then run spatial ...
1
vote
0answers
550 views
two results of IDW in ArcMAP are different
i added the following points to ArcMAP using "Add XY Data".
x,y,z
7,39,117
27,17,122
27,61,123
46,36,136
52,14,138
55,46,141
56,56,137
65,24,144
65,36,145
Changed raster output size in "options" ...
1
vote
1answer
39 views
Assigning value to a field on a layer based on spatial query with another layer
I want to assign a value to a field of a polygon layer based on the value of a field on another polygon layer, using a spatial query.
My first polygon layer contains buildings and the second contains ...
4
votes
0answers
73 views
Assigning costs to a road network : use raster or vector?
I have a road network in a PostGis database (db_routing). In another database (db_environment), I have some spatial features of the surrounding environment (trees as points and water bodies as ...
0
votes
0answers
14 views
Raster pixel calculator [duplicate]
I have used model builder to calculate a site suitability raster using the weighted overlay tool. I now have a site suitability raster and I have to pick one of four polygons that overlay the raster ...
4
votes
1answer
70 views
How to determine correlation between two databases?
I need to perform some tests and verifications on databases and/or datasets.
I need for example to analyze two databases and then determine if there is enough correlation between both.
My main issue ...
1
vote
0answers
49 views
Plotting time-series data in ArcGIS
I'm attempting to produce interpolated plots of water quality time-series data from ArcSDE. This is the data format:
OID WELL_ID WELL_NAME SAMPLE_ID SAMPLE_DAT PARAM RESULT
...
9
votes
3answers
205 views
Calculating mean slope: Harmonic or Arithmetic Mean?
I have to calculate the average upslope percent slope for a large dataset, the basic method is detailed here. However, I've begun to wonder if harmonic mean might be more appropriate than the ...
5
votes
1answer
102 views
Comparison of three contour lines
I am looking for a way to spatially quantify the difference between three contour line shapefiles. More specifically, I have two elevation rasters which I intend to create contour lines from, but ...
1
vote
1answer
78 views
Why won't Tabulate Intersection work?
I can't seem to find much in forums about this - I'm trying to use Tabulate Intersection with two shapefiles.
When run in a model, I get a generic error (Error 999999:Error executing function).
...
2
votes
1answer
66 views
Raster export for regressions analysis
I have the following issue:
I am trying to do a regression analysis between the (z) values of two rasters. What I would ideally like to have is the raster output not as grid but rather a list of ...
3
votes
1answer
128 views
Calculating Mean Upslope slope, curvature, etc
I'm trying to generate rasters whose values summarize the mean value of a given parameter (slope, curvature, etc.) of the upslope terrain. I feel like this should be doable using only a flow ...
7
votes
1answer
96 views
(How) do the modifiable areal unit problem and modifiable temporal unit problem interact?
I am reconstructing historical time series of land use and other related data from a variety of sources with different spatial and temporal resolutions and would be interested in what possible ...
9
votes
1answer
131 views
Compare spatial cluster/agglomeration patterns for polygon data
I have agricultural data in form of polygons which I would like to test for spatial clusterings/spatial agglomerations.
All in all I have about 40 variables which I can aggregate and standardize in ...
5
votes
1answer
213 views
Creating a subset of points shapefile with minimum distance between points in ArcGIS 10 [duplicate]
I have a sample of ~700 animal locations that I will be using for habitat selection analysis. I am trying to figure out a way to subsample my locations in a way that will maximize my sample size for ...
3
votes
0answers
80 views
How does Zonal statistics handle pixels that are on the border of the polygon?
I am using the plugin zonal statistics to calculate the sum of the raster cells within polygons. How does this plugin handle pixels that are on the border of the polygon, are those cell values ...
6
votes
1answer
69 views
What does shading indicate in home range plot?
I've simulated a home range in R using the clusthr function from the adehabitatHR package. The home range is made from 50 x,y coordinates. The output is attached.
I'm trying to get clear on what ...
3
votes
1answer
196 views
Interpolating Maps - Statistical Learning Techniques vs Spatial Statistics Techniques
I have recently begun experimenting with the inteprolation of variales over a whole country.
I have good sized training set where I have several dependant variables (continuous and categorical) ...
6
votes
1answer
149 views
how to aggregate the rates, represented by points, within X radius
the point represents rates like 10%, etc. (this was also pretty clear from 2 years ago) -- been trying to do this for 2 yrs...
the points dont represent numbers of events since they are rates ...
3
votes
2answers
92 views
How do I visualize a time and space sequence of events in ArcGIS?
I would like to visualize this scenario:
I have 5 weather stations. I would like to present a sequence of rainfall events for them. For example, rain was starts at station 2 at 6:09 and then went to ...
5
votes
2answers
383 views
How to implement bivariate Ripley's K function in ArcGIS 10?
The attached image shows a forest gap with red pine represented as circles and white pine represented as crosses. I am interested in determining if there is a positive or negative association between ...
-2
votes
1answer
96 views
How to calculate cumulative mean in Arcgis
I'd like to get cumulative mean value from a multiband image (4 bands). How can I do it in Arcgis, ERDAS and ENVI?
Thanks in advance
5
votes
3answers
170 views
How to test spatial correlation between two point layers
I have two point layers, which visually have spatial correlation. I'd like to test it but wonder if there is such a method or index？
3
votes
2answers
175 views
What is an appropriate statistic to measure spatial autocorrelation of points with binary values?
I am trying to determine the level of spatial autocorrelation in a point dataset. The attribute I'm interested in is binary (presence/absence of a species), for which Moran's I is not appropriate. ...
4
votes
1answer
194 views
Self organizing maps and spatially Constrained Clustering in R
There are a few algorithms to perform spatial clustering in R but most of them focus on point pattern analysis (for example here). I would like to perform spatial constrained clustering for polygon ...
4
votes
1answer
89 views
How to Reduce Decimal Precision of Image Value in ArcGIS?
I'd like to ask about the value on following image.
This is an interpolated precipitation layer using IDW method in Arcgis. On this layer, the values is like this:
This is a raster image. After ...
2
votes
0answers
22 views
How to interprete ArcGIS kernel density units when a population parameter is specified? [duplicate]
Possible Duplicate:
How to interpret GRASS v.kernel results?
The attached image shows trees in a study area based on their actual height in the field. The trees are overlaying a raster ...
10
votes
5answers
243 views
Learning Spatial Statistics
I have a significant background in statistics, and I'd like to learn more about spatial statistics (and statistics associated with geospatial data).
Are there any especially good resources for ...
2
votes
1answer
97 views
Accounting for Spatial Autocorrelation in ZINB Model?
I'm doing an analysis on disease in Chile. I'm using the rate as the Dependent Variable and both remote sensing and housing-type data as the Independent Variables. I have several questions regarding ...
5
votes
2answers
149 views
Spatial Analysis with Factors/Classifications
When doing analysis on spatial data with associated information that is numeric, it is possible to use techniques such as Kriging or Interpolation or Cluster Analysis to find out interesting ...
1
vote
4answers
2k views
Sum of areas in all each polygon layer?
I've got several layers/feature classes in an ArcMap 10 project.
Thanks to everyone's help, I'm able to get the areas for the polygons contained within each layer.
By opening the attribute tables ...
1
vote
0answers
100 views
About zonal statistic function in ARCGIS
I calculated zonal statistic in Arcgis to get max/min value of each LC types. Broadly, LC image include forest, grassland, waterbody etc. But output max value of zonal statistic function give me 0.972 ...
1
vote
1answer
70 views
How can I multiply each band of multiband image by separate scalars?
I have an image with 5 bands.
I need to multiply each band of this image by different scalars one time
(I'm lazy to do it one by one) and then get multiband image as a output.
For example ...
5
votes
2answers
338 views
Spatio-temporal block kriging with R package gstat?
In the documentation of sp I saw that the coords argument of the SpatialPolygons function only accepts 2 columns. Is it not possible to create 3-dimensional polygons? I am doing spatio-temporal ...
17
votes
6answers
680 views
Tutorials to handle spatial data in R
Does anyone know some good tutorials to handle spatial data in R? I know that there are some packages like rgdal and maptools but I haven't actually found usefull tutorials to get in touch with the ...
10
votes
1answer
148 views
How to create an error map to support an average kernel density map?
I've created an average kernel density map by running KDEs on points stacked within the same spatial extent. For example, say we have three point shapefiles representing seedlings in three different ...
2
votes
1answer
105 views
Obtain normalized raster average per polygon?
I have a raster that contains percentages of total forest killed plus a polygon layer that defines different zones.
My goal is to find a good statistical representative that describes the forest ...
19
votes
6answers
2k views
How to compare two spatial point patterns?
If I have two point pattern distributions within the same geographic region, how would I go about visually and quantitatively comparing those two distributions?
Also assume I have many points within ...
4
votes
1answer
208 views
How to write values from arcpy statistical output to table?
The attached script is my stalled attempt to perform the following workflow:
Create a table and create fields
Loop through a folder of point shapefiles and perform average
nearest neighbor analysis
...
6
votes
1answer
150 views
Calculating “relative slope” per Mora-Vahrson method in ArcGIS
I'm a longtime lurker who finally decided to register on the forum (in no way driven by my need to have a certain question answered, of course...).
I was contacted by a colleague asking for help ...
0
votes
0answers
45 views
Does the Calculation of Spatial Weights Matrix in ArcGIS take into account 3D?
This question is about Spatial Weights Matrix in ArcGIS. Does it take into account 3D or not?
I want to calculate Spatial Weights Matrix with SPACE_TIME_WINDOW.
Anton
2
votes
1answer
92 views
What are the geometric principles and GIS techniques that I can use to generate a postcode coverage of my city at street scales?
Postal codes of Brazil and another countries are oriented to distribution logistics, and improvement of reliability in writing the postal addresses; but without much concern for the spatial ...
3
votes
0answers
98 views
How do I access layer attributes from within QGIS' manageR plugin?
This is probably a fairly basic question, but searches for manageR come up with a lot of noise, and there's no manageR tag. What I'd like to do is load the attributes from a particular field of a ...
5
votes
0answers
216 views
How to use ESRI's spatial statistics tools on average values?
I'm wondering if anyone can tell me whether using the spatial statistics tools such as Getis Ord Gi* "hot spot" analysis in ArcView is advisable when your input data is an averaged value, e.g. the ...
