Questions tagged [spatio-temporal-data]

Data with a spatial component (points, lines, polygons, raster data, etc.) as well as a time component (a particular date, time, date *and* time, span of time, etc.)

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Python GeoPandas - if distance between each point and its neighbor(s) is less than 20m, delete all but the most recent point

I have a GeoDataframe that contains thousands of points with a corresponding timestamp (milliseconds), which is an amalgamation of many gps trajectories. I must check the distance between each point ...
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25 views

Linear interpolation for missing dates in Google Earth Engine

I have missing dates with no data which I want to create data for using linear interpolation. Most examples create a masked layer and replace the masked values but its my understanding that to ...
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Terra extract returns Nan value

I have tried to extract some temperatures for a given shapefile over North America. I used the terra package for extracting this data. It works for 14 of 16 areas in the shapefile. When I even try to ...
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GEE "List (Error) List.add: Parameter 'element' is required" error while calculating NBR

I'm trying to calculate NBR through Google Earth Engine, for a series of fires associated with some polygons. As such, the polygons have the information of the associated event. For each, I ...
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Resampling/down sampling GPS points in ArcGIS Pro using time interval?

I have a dataset of GPS locations collected over 6 years from animal collars. However, the ping frequency on the collar was drastically increased during the last 2 years, meaning that from 2014-2019 I ...
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Calculating average time between revisits into a pixel in ArcGIS Pro? [closed]

To determine the revisit rate of elephants into specific areas (several pixels across a map) I am looking at calculating the average time between visits into each specific pixel. I have a bunch of GPS ...
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Dataplotly with a temporal integration (QGIS)?

I want to perform statistics on a dataset in time frames or specific dates. I've been trying to figure out how to make the DataPlotly plots time dependent (using the QGIS Temporal controller). I tried ...
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Different data ranges from multiple polygons to obtain mean value from Image collection

What I am trying to do is from a shapefile that contains polygons (> 1000, simplified for this posting) and respective date of the fire ('FIRE_START') to: Calculate new dates to be used as time ...
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After creating multidimensional raster, a random outlier appears ArcGIS Pro

I have a set of raster images—13 in total. The values of in the cells of these rasters range from 0 to 1, and the base images have "nan" values which I solve this by using the Raster ...
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Assigning temporal properties to dimension when reading NetCDF data in QGIS

I have a NetCDF v4 files that has a time dimension. This time dimension has timestamps as per common CF Conventions. Other tools are able to open and deal with this dimension specifically. In QGIS (I ...
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Aggregating data by zip code over time in QGIS

I have data that is at the zip code level and I am looking to be able to have that data aggregate over time with a temporal display of the map. Is there a way to do this using QGIS?
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Create and publish a temporal (time series) viewer that synchronizes multiple layers from QGIS

I want to create a time series layer viewer as a URL. I have 3 layers (more will be added): Points1 Points2 Lines1 When a user changes the time, all layers will synchronize and show the correct ...
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Removing rows limitation when making feature layer query using ArcGIS Python API

I have a fairly big spatiotemporal dataset located at a server, which gets additional 1000 rows every 10 seconds for like two moths already. I am concerned to download and process this data day by day,...
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106 views

How to find first temporal occurrence of specific values for each pixel

I have a NetCDF file for a given region in North America. It contains temperature data from 1959 to 2009. I would like to extract the first day on which the temperature exceeds 273 K for each pixel. ...
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How to check whether a correlation is actually temporal or spatial?

I have two variables probability (of a fire) and temperature between 2001 and 2018 over multiple grid cells. When I look at the correlation through a simple Spearman it seems good (p = 0.01, r = 0.8). ...
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Irregular temporal data and visualization

I want to add timed data to ArcGIS. The problem is that the data is very bulky and in Excel file there are two columns of date and time of start and end of the interval and these intervals are ...
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Regression using spatio-temporal data

I'm trying to implement a regression using R, but the various models I have tried so far do not predict well at all. The dataset I'm working with consists of roughly 10,000 observations which ...
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Is there a raster data format that can store dates instead of numeric values?

When storing spatiotemporal data, there is a need to store dates or time data. I know raster files can store numeric data (integer or float), but what about storing of dates data? I'm currently ...
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Performing spatio-temporal join/filter between two polygon layers using QGIS

I have been looking for a long time for a good explanation of a spatio-temporal filter or join in QGIS. In my specific case I have two shapefiles (polygons) - one describes the ignitions and the other ...
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Semantic for encoding geometry-event relation in a spatio-temporal dataset

I'm assembling a database of spatio-temporal events; think deforestation for instance. I have different types of geometries that link to the events in different ways. I would like to encode that meta-...
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Filtering duplicate records using space and time overlap

I have a dataset consisting of about 23,000 fire incidents obtained from years of fire brigade reports. The incidents have a lat, lon, and timestamp. The problem is that in the case when two (or more) ...
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Spatio Temporal Interpolation with gstat in R

I am very new to spatial evaluation and come from psychology. I am using the software R and the packages "gstat" and "spacetime". I would like to do a spatio temporal interpolation....
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3 votes
1 answer
197 views

Dissolve spatio temporal data with GeoPandas without missing the temporal part

I am wondering if there's a clever way to use the dissolve() method of GeoPandas with a spatio temporal geodataframe without losing the temporal part. I have a dataset where for different days of the ...
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5 votes
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Spatio-Temporal Plot on a Basemap

I have trajectory data in LineStringM format and visualize relevant results via Leaflet on street map tiles. I was wondering whether it is possible to visualize spatiotemporal plots on OSM tiles. I ...
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Temporal nearest neighbour analysis in QGIS

How do I conduct a temporal nearest neighbour analysis in QGIS? Not sure if that's the right terminology, but basically, I have a dataset with ~100,000 house price transactions over a 5 year period. ...
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4 votes
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How does one make and use temporal joins of CSV files in QGIS?

I have two CSV files, one with spatial information, and one with temporal information, to be joined on id It looks like there are several methods, Layer/Add Layer/Add Vector Layer of both CSVs (or ....
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9 votes
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QGIS Temporal Controller with raster data

Starting from QGIS 3.14 TimeManager is dead, long live the Temporal Controller! There are a lot of tutorials out there how "Temporal Controller" deals with vector layers, which looks nice. ...
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QGIS Temporal Controller - last/most recent object within a temporal frame

i am working with temporal controller for just a cluple of days - before i've been using time manager. right now i am searching for a way to display the last/latest/most recent feature within a time ...
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3 votes
1 answer
514 views

Temporal controller - time-dependent symbology based on @map_start_time

I was just recently whatching Nyall Dawson's video "QGIS 3.14 time handling and map animation demo". at min 47 (nyall dawson / youtube video min 47 ) things are getting interesting from my ...
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2 votes
1 answer
250 views

Temporal rolling mean in stars

I need to find temporal rolling means (or other stats - max, min, etc.) in stars spatial obects. For stars raster cubes, this would be directly analogous to the calc(rasterBrick, function(x) movingFun(...
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Map variables do not appear in field editor or in project settings

I am attempting to utilize a few of the map variables (particularly the new @map_start_time variable associated with the added temporal features in 3.14). I am on version 3.14.1. I do not see any of ...
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380 views

Alternatives for the Emerging Hot Spot Analysis/Mann-Kendall statistic (less than 10 time steps) [closed]

I came across ESRI's Emerging Hot Spot Analysis (Space Time Pattern Mining toolbox) and really like what it does. Unfortunately for me, it relies on the Mann-Kendall statistic which apparently needs a ...
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2 votes
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Existing standard country codes explicit in time and space

There are several comprehensive systems for coding countries such as ISO, TLD, M49. I am looking for a system that is explicit about the time period that the code refers to. My application is a ...
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2 votes
0 answers
96 views

Spatio-temporal clustering Algorithm

I'm working with a dataset with latitude, longitude and date-time. I have millions of points per day and I want to group them using a clustering algorithm. I read this question Clustering geographic ...
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2 votes
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240 views

Spatio-temporal kriging

I have a geospatial dataset of air quality and I want to interpolate the air quality value across time and space for unmeasured location and time instace. I found gstat package in R could do the ...
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5 votes
1 answer
5k views

Indexing coordinates in order to get a value by coordinates from xarray

Firstly, I am a super rookie and just recently started working with GIS. Therefore I am not sure how to ask/word the question, or even if it makes sense. So bear with me. I have some NetCDF files, ...
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-1 votes
1 answer
455 views

GeoJSON and/or Shapefile: Temporal data w/ multiple dates per feature

I have a large dataset that's frequently being updated, and it consists of tens of thousands of geospatial polygons, each of which has one or more (potentially over 100) timestamped average ...
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2 votes
1 answer
456 views

Joining points and polygons by date in Google Earth Engine

I am using an aerosol index, which I reduced to a daily mean for 2019: var airq_19 = ee.ImageCollection('COPERNICUS/S5P/NRTI/L3_AER_AI') .select('absorbing_aerosol_index') .filterDate('2019-01-01'...
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14 votes
1 answer
1k views

Producing Space-Time Cube in QGIS

Although I have seen many examples about doing this at ArcGIS Desktop, I am still trying to find a how to using QGIS. What I want to do is something like the image below.
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1 vote
1 answer
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Measuring/4D relation querying within linestring using PostGIS

let's assume a Linestring(Z)M holding a timestamp as measure variable with each point. Is there a way to easily query "on the relation of those timestamps between the points". For example to find ...
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2 votes
2 answers
2k views

Python function/library for spatio-temporal clustering?

I want to cluster based on time lat and long. Is there a way I can do this? The context is I am trying to detect connected sites in same electric ring. The data I have is the location of the site(lat/...
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1 vote
2 answers
783 views

NetCDF time aggregation using R stars package

I have a monthly temperature netCDF dataset with aprox 20 years and I'd like to calculate a monthly climatology (average of all Jan, Feb, Mar...). I know I can do this with stackapply from package ...
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2 votes
1 answer
307 views

Georeferencing a numpy tensor (spatio-temporal data)

I have a CSV file in which each row represents a record of an event with the following columns: latitude, longitude, time I want to build a numpy tensor with n x m x 8760 (hours in a year) ...
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1 vote
1 answer
248 views

Can ArcGIS Operations Dashboard manage routine data collection at same geographic points?

I have started working an organisation that uses ArcGIS to manage its GIS data generally. They use a wide range of other software and methods to also manage collection of routine data, such as: ...
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1 vote
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Proper identification of duplicates using spatial and temporal criteria in PostGIS

I have a table with metadata about sampling locations in the ocean. It includes geographic coordinates, date-time in which sampling was done the number of vertical measurements in each location (...
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157 views

Using a MODIS code for DAYMET and I don't get any output

I am using the code below that was originally provided by @Kuik, and I have since converted the bands to DAYMET 'tmax' and 'tmin' bands. Problem is that when I run the code, I receive no output. ...
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301 views

spatio temporal anisotropy in R: stAni argument in vgmST and krigeST

I have some problems in understanding the usage of argument 'stAni' of vgmST and krigeST functions, for the setting of spatio temporal anisotropy. How have I to interpret this argument, that is the ...
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1 vote
0 answers
219 views

Space-Time Principal Component Analysis with Missing Lat/Long Data [closed]

I am looking to run a space-time Principal Component Analysis on Shotspotter data from Brockton, MA: http://justicetechlab.org/data/. Shotspotter sensors record the timing, location, and number of ...
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Google Earth Engine: How to calculate regular day interval means in image collections, maintaining "system:time.start" field?

I've merged three Landsat collections in Google Earth Engine, now I need to calculate median values at regular time intervals, let's say 32 days, because I will create a collection to join with MODIS. ...
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1 vote
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84 views

Showing change of lot division/ownership over time?

I am new to GIS programs and using ArcGIS Pro. I am mapping a neighborhood and looking at creating a detailed database of the ownership history. Currently I have the lots configured to have an ...
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