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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10
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4answers
5k views

How to find Clusters of N Points Within X Distance?

We have tried two methods of cluster analysis: Cluster and Outlier Hot Spot ... but neither meets our specification which has these 3 parameters: a Set of Point features N points within a ...
6
votes
2answers
398 views

What do ArcGIS regression analysis warnings 000853, 000916 & 000981 mean?

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 ...
0
votes
0answers
372 views

Which is the best interpolation method for collected ground water sample?

I have collected ground water quality samples from 50 locations in my study area. Now I have to interpolate data in ArcGIS. Which is a suitable method for ground water interpolation and why?
1
vote
1answer
530 views

How to make a field “Unique ID field” in ArcGIS?

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, ...
1
vote
0answers
108 views

Mann-Whitney U test for rasters

I'm doing a Mann-Whitney U test to compare two very large samples (sample size 1 = 13250; samlple size 2 = 38871) originating from a shapefile with 52121 features. I know t-tests are not recommended ...
9
votes
7answers
3k views

how to overlay shapefile and raster?

I have a shapefile with polygons. And I have a global raster file. I want to overlay the shapefile's polygons onto the raster grid and calculate the mean raster value for each polygon. How can I do ...
0
votes
1answer
65 views

Summary Statistics tool for Mean Z values

I'm using ArcGIS 10.2 The summary statistics tool is not functioning in the way that I want. I made an elevation layer that is a DSM, and then in my buildings layer I determined the height for ...
1
vote
1answer
285 views

How to get “p value” for time series data to detect significant change

I have yearly maximum NDVI data (1982-2008) and extracted all value to Excel. Also calculated slope value for each point during the 27 years. All of you know the slope value represents changes per ...
2
votes
0answers
150 views

AGI STK Server alternative

AGI has a server product called STK Server that exposes REST services to perform satellite acquisition planning. However the cost is astronomical $200k+ (pun inteded). They also have STK components ...
0
votes
1answer
102 views

How to choose pixel values according to each land cover class?

I would like to do following steps using two types of images (precpitation and Land cover image): select pixel values of precipitation image within each land cover classes calculate total amount of ...
2
votes
0answers
21 views

Setting the number of bars in a histogramm

I am using qgis' 2 "Statist" to build a histogramm for my data. I see that I can set the band width of the bars, but it seems that "Statist" does not provide the option of setting the number of bars. ...
5
votes
1answer
309 views

percent of total population is x distance from nearest point (ArcGIS 10.2)

I'm getting my but kicked by some statistical analyses in ArcGIS 10.2 and need a bit of assistance. I have two data sets. One is a raster which represents the population of a country at 100m ...
4
votes
1answer
71 views

What statistic / process should I be using?

I am trying to determine the best process to analyse some predicted water levels against observed values at specific points. I can do this simply as 1 to 1 relationship to get a r square. I would ...
2
votes
0answers
32 views

How does changing the kernel density search radius affect the units expressed in the map legend? [duplicate]

I'm trying to understand how ArcGIS 10.1 handles kernel density values and how these values are reported in the legend. For example, the following parameters were used for the KDEs in the attached ...
2
votes
1answer
215 views

What does the “Standard Distance” output from the spatial point pattern analysis in QGIS 2 represent?

I have a cluster of points and I am using the Spatial point pattern analysis tool from the processing toolbox in QGIS 2. I am having trouble understanding what the "Standard Distance" output is? It ...
3
votes
1answer
73 views

Exploratory search for clusters in point data

This is a more conceptual than practical question and is about exploratory cluster identification. While there are very specific meanings in the geography canon as to what they are, in economics they ...
1
vote
1answer
338 views

How to use a polygon grid to calculate statistics on line and point features

What seems a simple task but I can't find the right tool to do it. I have a polygon grid cells and say a point feature class. I want to be able to create a table that contains the grid cell ID and for ...
2
votes
0answers
82 views

Determining spatial cluster of park types in ArcGIS

Question 1: I am trying to determine which (if any) of my different park types are spatially clustered across my study area (city boundary). There are 162 total parks, 9 nominal categories (which ...
1
vote
1answer
160 views

How can I know how many percent of area changed between 2 time step in arcgis?

I'd like to ask how to do change detection in ARCGIS? I need an image to show how many percent of area in class has been changed between 2 years? for example in output image, red is the area that has ...
6
votes
1answer
214 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 ...
3
votes
1answer
932 views

How to create mask file from shapefile using ArcGIS for Desktop?

I have a shapefile of Lakes over my study area. Each polygon has attribute information of each lake, name, shape etc. Actually I want to eliminate all lakes from analysis. In other word, I want lakes ...
7
votes
1answer
356 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 ...
2
votes
2answers
701 views

Using Regression Trees in ArcGIS

Hi I have a follow up question to this post: Statistical analyses for survey against raster? I have a very similar problem as the initial poster David. I am creating a multivariate model from ...
2
votes
1answer
131 views

How to Deal with Overlapping Coordinates in Statistical Analysis

I decided to make an archaeological map about certain tombs distributed in the area of Crete and make some statistical analyses using the spatial statistical tools of GIS. Specifically, I'll be ...
6
votes
1answer
3k views

RMSE between two rasters step-by-step

Can anyone show how to calculate the RMSE (root mean square error) between following two rasters step-by-step and discuss on the obtained results' min and max values, and how to interpret it. Thanks a ...
6
votes
0answers
318 views

How to store Large Raster Images of Equipotential Surface Generation Using Monte Carlo Simulation?

I have a large (1GB+) raster that I am using as the base for the generation of an equipotential surface. This is to assess the accuracy of DEMs derived from another source. In situ observation is ...
2
votes
1answer
328 views

How can I define hierarchical levels in eCognition

I'd like to define classes with 2 levels. Firstly I'm gonna classify some broad classes such as forest, grassland in a level 1. Furthermore, I'd like to classify these classes into some sub-classes ...
26
votes
7answers
5k 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 ...
1
vote
1answer
202 views

Relational operation in eCognition

Is there anyone who has a experience with relational operation in eCognition. I'd like to ask 2 questions related to eCognition. 1. How can I classify the pixel values between 0.23 and 0.46 as a class ...
2
votes
1answer
2k views

Spatially join large raster to polygon shapefile

I have a large raster file with elevation data. From this raster, I would like to infer the average ruggedness for different geographic zones (like countries). I have the "countries shapefile" as a ...
16
votes
1answer
405 views

How can I statistically calculate the “real” road from a set of GPS tracks

I participate in a long-distance cycling club, and we started to collect GPS data routinely from our riders. My interest is to calculate "the real trajectory" for future events based on accumulated ...
4
votes
1answer
85 views

How to choose a GRASS kernel density function?

I'm starting to use the Grass module on QGIS, and I want to do a heatmap, so, I'm creating a new surface using the kernel function. But, GRASS come with 7 types of kernel functions, how do I know ...
2
votes
0answers
397 views

Problems with spatial autocorrelation in Geographically Weighted Regression (GWR) analysis

I have conducted an Ordinary Least Squares (OLS) and Geographically Weighted Regression (GWR) analysis in ArcGIS where I have tried to predict biodiversity patterns in an area. When I examine the ...
8
votes
2answers
218 views

spatial and spatiotemporal analyses

I have a dataset that consists of 247 mosquito traps placed in fixed positions and sampled weekly for 23 weeks. I also have dengue disease incidence data (indexed to home address) during the same time ...
1
vote
4answers
350 views

Detection of geographical trend of a variable

What is the best method to detect and graphically display the spatial trend of a variable? I'm looking for something that tells me the probability that the trend is from "north-west to south-east" or ...
0
votes
1answer
551 views

How to calculate median value of polygon from points in ArcGIS?

I have a point layer coming from LIDAR data containing x,y,z and intensity values. On the other hand I have a layer containing several polygons. All the points are inside the polygons. I need to ...
3
votes
0answers
91 views

Quantifying polyline overlap

I have a set of regions and would like to quantify the degree to which the boundary of these regions are situated on/near rivers. I have turned the regions from polygons to polylines in arcgis 10.1 ...
27
votes
2answers
3k 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
votes
1answer
478 views

WinBUGs giving 'Illegal memory write error' running under wine [closed]

Ok some I am trying to use Winbugs to do spatial smoothing. I am running r code in R study and using R2WinBUGS to call Wine 1.4 under Mac OSx Mountain Lion. It works ok for some models but for the CAR ...
1
vote
0answers
648 views

Validation of Regression Kriging

I am interested in exploring the idea of generating a predictive model for a target variable in a spatial context. I would then like to correct the residuals of this model using kriging, i.e. in a ...
8
votes
2answers
362 views

How to quantify unevenness of polygon boundaries?

I have two polygons: Polygon 1 and Polygon 2. Using two metrics, area and perimeter length, I want to express quantitatively that Polygon 1 has a more uneven/jagged/irregular perimeter than Polygon ...
7
votes
1answer
273 views

How can I calculate Moran's I in 3D?

This may be a question to post on a GIS forum, but I was wondering if among the spatial data experts here, someone could help me calculate the extension of Moran's I to 3D? Our data is about 3D ...
1
vote
1answer
127 views

Use of Grass and R w.r.t. Land Use Prediction

In my data mining term project I need to conduct a work on geospatial data related to a big city to show possible urbanization fields in next years. I've used GRASS lately on other projects so I'm a ...
0
votes
0answers
66 views

How to simplify vector lines into an overlaid grid in QGIS?

I'm a relatively new user with GIS software (primarily QGIS) and I'm sure this is probably quite simple but I've been trying to find an answer for ages! I have transportation network data for an area ...
0
votes
0answers
124 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
0answers
344 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 ...
3
votes
0answers
104 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 ...
1
vote
0answers
22 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 ...
1
vote
0answers
728 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" ...
4
votes
1answer
251 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 ...