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.
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 ...
26
votes
7answers
5k views
Open source methods for kriging?
I have a point dataset which I'd like to Krige, ideally using an open-source software package. If possible, I'd also like to choose the semi-variogram model during the process to improve the ...
6
votes
2answers
1k views
Spatial statistics tools : clustering analysis on raster data
I've an apparently simple problem, but i can't find a clear methodology to use.
I'm tasked to delimit "urban areas" by vector convex polygons, using the Gridded Population of the World dataset from ...
6
votes
1answer
152 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 ...
5
votes
4answers
5k views
How to convert zip codes to latitude and longitude?
I have a data set that includes a list of zip codes. Is there a way in R to convert these zip codes to latitude and longitude coordinates?
5
votes
3answers
567 views
Select maximum number of points more than x meters apart
I have a dataset of ~15,000 points that are locations along ROV survey tracks where measurements were taken. These points can be less than 5 meters apart and the survey tracks often cross or can be ...
22
votes
2answers
895 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 ...
10
votes
2answers
294 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 ...
10
votes
1answer
2k 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 ...
9
votes
1answer
225 views
How to find the most spread out locations?
Probably a very simple question. I have a list of about a thousand potential geographical locations (lat lon), and of those I need to select the 200 locations that are "most spread out". I think that ...
10
votes
2answers
1k views
Is there a Free Aggregate Points tool out there for ArcGIS 10?
I need to do some Getis-Ord analysis but first I need to aggregate my points. I know of XToolsPro, but the aggregate points function is locked and you must purchase a license to use it. I am ...
8
votes
4answers
932 views
In ArcGIS Is there a tool that will select a percentage (75%) of a whole group of points based on the distance from one separate point?
This is ArcGIS specific.
I have 2 point shapefiles A and B, the first one (A) is a single point that contains a lat long, the second (B) is a multitude of points (over 12k) that each contain their ...
5
votes
1answer
118 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 ...
4
votes
1answer
270 views
Statistical analyses for survey against raster?
I am somewhat of a newbie to geostatistical analyses, but pretty
familiar with GIS and remote sensing packages. I was wondering if
anyone had suggestions on appropriate geostatistical analyses for a
...
5
votes
2answers
416 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
115 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 ...
7
votes
3answers
727 views
How to cluster points based on a kernel density?
I have a large dataset with 36k points representing commercial land uses, each with a field containing the square footage. I have run a kernel density analysis on this dataset, producing a raster ...
4
votes
2answers
272 views
Spatial query of raster data
I have population distribution data as a raster layer and exposure contours as vector (polygon) layers. What I'd like to do is use the vector layer to estimate the population indicated from the raster ...
3
votes
1answer
137 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 ...
2
votes
1answer
504 views
Outputting results message from spatial statistics tool to text file using python
I'm using the following tool in ArcGIS 10 - Calculate Distance Band from Neighbor Count (Spatial Statistics). I'm using a python script to execute this tool several times on different shapefiles:
...
1
vote
1answer
143 views
How to fit a polygon to a “best buffer” about a reference geometry in it?
If I have a polygonal geometry gbase, like a street (a rectangular strip), and a reference geometry gref, like a central line of gbase. The question is what is the function (here named BestBuffer) ...
