Science topics: Geoinformatics (GIS)spatio-temporal analysis
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spatio-temporal analysis - Science topic
Explore the latest questions and answers in spatio-temporal analysis, and find spatio-temporal analysis experts.
Questions related to spatio-temporal analysis
Hi there,
I am trying to use VariogramST function in R, for spatial-temporal kriging.
The values I am working on, are monthly based; while in the function VariogramST, the predefined "tunit" is hours, days or weeks.
I appreciate if anyone can tell me how to change it to months?
Thanks,
Hamideh
Dear esteemed colleague, Could you please provide an explanation of the primary challenges involved in conducting a spatio-temporal analysis of a model involving three species? Some references would be quite beneficial.
Hi -
I am looking for a way to quantify annual temporal variation in the intensity of space-use (per pixel across a reserve) into a single value. I was originally looking into using the coefficient of variation - however the CV does not appropriately quantify the intensity of utilization. For example, areas with high constant utilization and low constant utilization will both have a value of 0.
I will have yearly intensity of utilization values for each pixel with a park, where 5 is the highest possible utilization and 0 is no utilization. So for example:
2017 2018 2019
pixel 1 5 5 4
pixel 2 3 1 5
pixel 3 1 0 1
I'm looking for one single value per pixel, that can quantify the temporal variation whilst still accounting for the total intensity of utilization. Is there something similar to the CV that will also be able to account for the magnitude of utilization per pixel?
Thanks in advance for your help,
Emma
I am planning to do a spatiotemporal analysis (2010-2020) of urban heat islands in Metro Manila, Philippines, specifically on how they correlate with factors such as population density, average precipitation, and the prevalence of infectious diseases (e.g. leptospirosis).
I am new to this field of study and the methodology in most papers I have read is highly computational and beyond my comprehension. Can anyone suggest a statistical method I can use to correlate urban heat islands to multiple factors? Also, can anyone suggest an appropriate software I can use to run these analyses?
Is there any good software that able to show the good results of spatiotemporal analysis of GIS outputs?
have you encountered / used any spatial visualization technique before,
if so can you please take the following survey :
thanks in advance,
Mohammad Shaito
PhD Student
The University of Texas at Arlington
Department of Computer Science and Engineering
Mining and Analysis of Spatio-Temporal Data (MAST) Lab
At present, most researches construct the topic model of the text first, and then analyze the results in time and space. Is there a better way to combine?
Dear All , I am biggener in Bayesian spatial modeling . I have structured and unstructured random effects in my formula . I extracted and mapped the posterior means . I can't understand what a high/low value of structured and unstructured means (interpretation).
R code is as under:
nb <- poly2nb(map)
nb2INLA("map.adj", nb)
g <- inla.read.graph(filename = "map.adj")
map$re_u <- 1:nrow(map)
map$re_v <- 1:nrow(map)
hyperprior2 <- list(theta=list(prior='loggamma',param=c(1, 0.0005)))
formula2 <- obs ~ NDVI + f(re_u, model = "besag", graph = g, scale.model = TRUE, hyper = hyperprior2) + f(re_v, model = "iid",hyper = hyperprior2)
res2 <- inla(formula2, family = "poisson", data = map, E = E, control.predictor = list(compute = TRUE),control.compute = list(dic = TRUE))
summary(res2)
map$RR <- res2$summary.fitted.values[, "mean"]
map$LL <- res2$summary.fitted.values[, "0.025quant"]
map$UL <- res2$summary.fitted.values[, "0.975quant"]
map$spatial <- res2$summary.random$re_v$mean
map$nonspatial <- res2$summary.random$re_u$mean
tmap_mode("view")
tm_shape(map)+ tm_polygons("RR", alpha = .50)
tm_shape(map)+ tm_polygons("spatial", alpha = .50)
tm_shape(map)+ tm_polygons("nonspatial", alpha = .50)
I have been trying to download the bands 10 and 11 of LANDSAT 8 for a GIS analysis however the images downloaded from both Glovis and Earthexplorer have been resampled to a 30meters spatial resolution. Please who knows how I can get the 100m spatial resolution TIR band for my analysis
If POD or DMD is applied to flows which are not turbulent in a broad sense, which means that there is not much chaotic mixing, will they carry any significance? Because there will be not many spatial and temporal scales like in a turbulent flow.
Hi, good day all 😊
Does anyone know how to calculate the lag time of a disease? ..I want to associate between environmental variables such as rainfall, humidity, temperature etc with Tuberculosis incidence ..my research is on spatiotemporal analysis using Geographic Information System (GIS) ..I have read few journals, some of them use Spatial Lag Model, Excel Stat and SPSS to calculate the lag time but I did not know which method that was accurate and easier for me to learn ..thank you very much for your suggestion ..really need your guidance 🌹
I am postgraduate student who is very stuck with some statistical analysis.
I am trying to calculate the biodiversity of continuous plankton recorder (CPR) data of phytoplankton which has been resolved to genus level. I was originally wanting to calculate average taxonomic distance but have had some technical difficulties there so have resulted to trying to find a different biodiversity index.
I know all the indexes have pros/cons based on research question, but am struggling to find anything to help inform my decision. So far am leaning towards Hill numbers?
If anyone had any advice about these biodiversity indexes, or could point me in the direction of some useful references, that would be very helpful!!
We have constructed grids of abundance in different dates. We intend to model the spatial shift of abundance in time in a way that would allow comparisons between different species. The core task is to create paths/vectors that represent the spatial shift of raster-like quantities. ArcGIS, QGIS or R implemented algorithms?