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.

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41 views

Extremely high z-values for Moran's I

I made the following in advance: I aggregated population data to 100*100m Grids. Afterwards I wanted to find out, weather there is autocorrelation in the data or not. For this I applied the Moran's I ...
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33 views

Comparing different degrees of local spatial association

I have two data sets and want to compare/evaluate their degree of spatial association expressed in terms of the LISA statistic. The local Moran's I statistic gives for each point a (pseudo) p-Value ...
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76 views

Explaining different results from Ordinary Kriging and Universal Kriging?

When using either methods to create a surface from the same set of observations, these surfaces differ from each other. Visually it can be seen in the differences of the following contours (...
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27 views

Best way to store, elaborate and query raster data [closed]

I have created multiple raster images with GRASS-GIS (~150Gb), that I'll need to multiply for a certain coefficient, and query the results that need to by saved just temporally. The portions of the ...
2
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1answer
28 views

Identifying the best OLS regression model

I have 10 independent variables to include in an OLS regression model. I know how to interpret the results and that for comparing models, the AICc value can be used, where a smaller value indicates a ...
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3answers
167 views

How to show statistically significant incident locations

First let me preface with I tried to search for this solution first but I don't really know how to word it and could not find any results so excuse me if this is a duplicate. I would like to know how ...
2
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1answer
118 views

Spatio-temporal statistical analysis

I need to perform an anomaly analysis in both space and time. I have 4 data parameters: latitude, longitude, time and temperature. What I’m trying to do is to find temperature anomalies that are ...
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2answers
6k views

Performing regression analysis between two variables using ArcGIS Desktop?

I have a temperature image (interpolated from climatic point data) and NDVI data at the monthly interval. I need to do correlation analysis between temp and NDVI. Is it impossible to do this using ...
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1answer
95 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? ...
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1answer
66 views

Problem replicating ArcGIS Grouping Analysis 'grouping effectiveness' statistic results

I posted this question over on Esri's GeoNet, but have not yet gotten an answer. Using ArcGIS v10.2.1, I have been using the Grouping Analysis tool to generate a range of clusters from my data. I ...
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2answers
73 views

Counting point objects near each feature in polyline layer of ArcMap?

I am having a little trouble finding a strategy for this. I have a polyline layer with Fiber segments, each have a FiberID. They are not unique, sometimes there will be two segments with the same ...
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0answers
103 views

Is median center more influenced than mean center by value outlier in ArcMap?

I noticed something strange or seemingly paradoxical in ArcMap 10.2.2. The median center is less influenced by spatial outliers than mean center, this is a fact. The thing is, I created 6 dispersed ...
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76 views

How to calculate Spatial Autocorrelation of grouped points in ArcMap 10.2.2

I have 32 points uniformly distributed with 7 attributes that comprises continuous values. I used the Grouping Analysis tool in ArcMap 10.2.2. I set 2 groups that have clear differences and are also ...
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0answers
65 views

Interpreting Statistical Analysis (Moran's I v High-Low)

I am currently examining the results of spatial statistics using Moran's I and High-Low clustering methods. I have used distance thresholds of 5 miles, 10 miles, and 15 miles for each. Moran's I ...
6
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1answer
252 views

Creating forest patches from land cover layer?

I have a land cover layer from which I've extracted the tree canopy class and set all values that are not tree to NULL. I've also converted it to a vector and exploded it to make single part features. ...
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0answers
141 views

R: Using Inverse Distance Weighting with the mapply function

I would like to find what are the optimal power parameters and number of neighbours for Inverse Distance Weighting (IDW) interpolation using the mapply command and the gstat package in R. The optimal ...
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0answers
231 views

Statistically comparing two sets of coordinates [closed]

I have been given a task to compare two sets of points, one set being a set of predetermined points, on the other being a set of actual points that were taken in the field. I have to compare these ...
3
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0answers
161 views

How do I statistically compare positions from two track datasets?

I have two datasets with positions that I need to compare. One would be the "observed" positions (someone took the GPS positions manually) and the other one was calculated using a software. To use ...
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1answer
38 views

Workaround to not create new layer

I have a working code (shown at the bottom). The problem is process time is about 12 seconds for each loop. If I want to use this for the whole data I have (about 1 million points), it would take ...
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1answer
968 views

Making Unique ID field for Ordinary Least Squares in ArcGIS Desktop?

I need to perform an OLS (Ordinary Least Squares) but ArcGIS asks for a unique ID field. I have a field which would be the right candidate, it's a FIPS number (12 chars), which I have made a number, ...
2
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1answer
67 views

How to separate out bands from hyperspectral data using R

I'm having one hyperspctral data with 426 bands, with dim 250*250*426. I want to seperate each bands. I tried like this img <- stack("name.tif") rr <- array(, dim= c(250,250,426)) for(i in 1:...
3
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1answer
41 views

Distinguishing Road Network according to the ward within a municipality ArcGIS

I have a polygon layer of a municipality containing 14 wards as shown in figure i. I also have a polyline layer of road network irrespective of the ward. The road network have following attributes -...
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3answers
4k views

Using R with ArcGIS Desktop

In response to comments below, a re-phrasing of the question. I've used the integration of R with QGIS, and found it a very uesful tool. Having taken a look at the R toolbox extension for 9 and the ...
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0answers
38 views

Spatial Correlation of Kernel Data & Land Use/Land Cover

Is it possible to extract spatial correlation values between kernel data (from point data) and land use (vector) and land cover (raster)? My goal is to quantify the relationship- if any- between a ...
2
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1answer
1k views

Using Regression Trees in ArcGIS

I have a follow up question to Statistical analyses for survey against raster? I have a very similar problem as the initial poster David. I am creating a multivariate model from raster data in order ...
3
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0answers
487 views

Single Tree detection

I was wondering how I could extract "crown area" of single trees in a forest from a high-resolution image with only 3 band (RGB) in ArcMap. ( No NIR to use NDVI as any threshold). I need a fast easy-...
3
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1answer
252 views

Looking for example of a Random Forest tutorial to estimate spatial distribution

Could anyone point me to a Random Forest tutorial for predicting a spatial random variable? Or an easy dataset to try to work through. For Decision Trees and Random Forests, I found some very good ...
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0answers
77 views

Using linear regression for geospatial data?

Say, my database has three columns. A: county (300 rows with 300 counties as index), B: X (some independent variable in continuous scale, which is the average of everyone in that county), and C: Y (...
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1answer
311 views

Implementating Analytical Hierarchy Process with ArcGIS 10.2 for Desktop?

I want to use the AHP in arcmap 10.2. I have tried using the arcscript available from http://arcscripts.esri.com/details.asp?dbid=13764 Which was designed for Arcmap 9.2. I was able to get as far ...
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1answer
105 views

Calculate area above elevation threshold

I have a number of 95% isopleths (polygons) that represent animal home ranges. For each isopleth, I and want to calculate the Area (sq km) above 2000 meters. My initial thought was to create ...
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0answers
22 views

Metrics and features for comparison of aggregated trail dataset

I have hundreds GPS traces generated by cars for single road in the city from direction A to B. And I have hundreds of GPS traces generated by people which organized in trail in the mountain from ...
4
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1answer
121 views

Correlation between corn yield and planting speed using ArcGIS for Desktop or QGIS?

I have two maps that originally come from a harvester and a tractor as shapefiles: Corn Yield and Planting Speed. I would like to know what would be the best procedures to statistically answer the ...
3
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0answers
104 views

Interpreting Global Moran's I and should I krig?

I am trying to weigh up if kriging (or cokriging) the residual error from my model is a valid approach. My first step was to compute whether the error is spatially autocorrelated. I have done this ...
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1answer
247 views

Significance test for Moran's I using Monte Carlo Simulation?

I calculated the residuals for my model and measured Moran's I for the residuals of the model. How can I pragmatically determine the significance of Moran's I using Monte Carlo simulation?
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1answer
196 views

Approximating GPS coordinates for a point from n expected locations

I'm trying to find the coordinates of my point of attention (point X,marked blue). I used the GPS device of my car to collect the coordinates according to where I parked my vehicle each time I visited ...
0
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1answer
51 views

count band numbers from multiband raster image

My raster image has 10 bands (10 bands are 10 year), cell values of each one are 1, 2, 3. One is negative anomaly, 2 is no change area, 3 is positive anomaly. Now I want to find how many years out of ...
5
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1answer
927 views

ggmap, ggimage… - Saving and loading maps in R

In my current R project I'm using the ggmap package to download and display maps. What bothers me is that you need internet access to load maps from google etc. I'd like to load a map from the ...
4
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1answer
99 views

Index express the similarity in shape between two data sets

I have two data sets. One is points in the blue curve. The other is points in the green curve. Now I want to find a property (P) or something else like index that has the following characteristics: ...
5
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2answers
960 views

How to find the watershed for each outlet point and sum values within it?

I have the following files to work with: Stream network of a basin; Outlet points for each segment* of the network and Points which represent water withdrawals along of the stream, which are not ...
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0answers
105 views

Performing Regression Analysis using ArcGIS for Desktop?

I am trying to perform regression analysis using road accident data using ArcMap 10.1. The accident data is a point file for all accidents with information on the date the accident happened, time, ...
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1answer
31 views

Conflicting results for spatial autocorrelation tests

I am working with an imbalanced (5%/95%) presence/absence dataset. I've created 25x25 m. raster cells that are categorized '1' or '0'. My Geary's C result (~0.993) and Moran's I result (~0.0045) are ...
2
votes
1answer
137 views

How can I conduct dimension reduction using Geographically Weighted Principal Component Analysis?

I want to know how to compute the importance of components for geographically-weighted-principal-component-analysis(gwpca)? That is, I want to reduce dimension according to cumulative proportion of ...
6
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4answers
747 views

What are the most efficient Geographic Weighted Regression packages?

What are the most memory efficient open source packages for calculating a geographically weighted regression (GWR)? I am in a situation where I need to do a geographically weighted regression on a ...
0
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1answer
89 views

How to quantify the coverage area?

I have a task where I shall quantify AIS coverage in a predefined geographical area. The AIS is a system where automated positional data is sent from ships to base stations. I have AIS data with lat/...
2
votes
1answer
70 views

A way to measure whether two variables have similar spatial distributions?

I'm doing a project that's looking at a certain disease outbreak and vaccination in California counties using arcmap. I have aggregated data joins for disease outbreak rate, personal belief exemptions,...
7
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2answers
690 views

Confidence interval from raster data

I have raster data that represents a probability distribution, i.e. each cell has a probability value (in my case the probability that an animal may be found in the cell), and all the cells add up to ...
14
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3answers
785 views

How to determine if trees within forest gaps are clustered?

The attached dataset shows approximately 6000 saplings in approximately 50 variable sized forest gaps. I am interested in learning how these saplings are growing within their respective gaps (i.e. ...
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0answers
134 views

Using R to find attributes of spatial neighbors, especially with big spatial polygon data frames

If it's not too much, I have a specific question that leads to a more general one: I'd love thoughts on both if it's possible. First, the specific: I have an analysis involving census blocks and ...
3
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0answers
118 views

Spatial weight matrix with boundary effects in R?

I need some help to finalize code for a spatial weight matrix that uses a nearest neighbor definition within regions, but does not allow neighbors from across a political border. For example, ...
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1answer
43 views

Create statistics by features in QGIS [duplicate]

I've a polygon layer for parcels in a landscape protection area and a point layer, contains zoological data (e.g species, entities, etc.). How can I make a statics for each polygon, contains the list ...