Questions tagged [time]

A nonspatial continuum in which events occur in apparently irreversible succession from the past through the present to the future

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Date label on a Sentinel-2 image collection (Google Earth Engine)

I found a way to add text to the images of a collection using a package that GEE user Gena created for this purpose. I used this code as guide, in the addText function I used the property system:...
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How to obtain the daily Temporal variation chart using Sentinel 5p methane

I want to generate the daily temporal variation chart of methane concentration over India for the years 2019, 2020, 2021 and 2022. The average methane values for a single day, say, 1st January is to ...
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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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Exporting time enabled map in Layout view using ArcGIS Pro

I would like to export a video of a time enabled map in ArcGIS Pro. I know that it is possible to do this when you are just working with a map. However, I would like to have the time enabled data run ...
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4 votes
2 answers
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Convert date/time format

My shapefile contains a attribute field called "created" (type QString) and this field holds the date and time of every feature in this format: "2022-03-04-13-28-26" (yyyy-mm-dd-hh-...
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Animation of temporal data doesn't work

I am pretty new to QGIS. I have a huge dataset (~40.000 rows in Excel) of detected batcalls. These were detected with stationary batloggers. Whenever a batcall was detected, a timestamp was saved for ...
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How to enable the time dimension for layers in GeoServer

I have a collection of GeoTIFF files, each one corresponding to a date and time. How can I had the information date and time to those GeoTIFF, so that GeoServer allows the enabling the "Time"...
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gdal calc operation takes too long to make shaded relief map

I am new to using GDAL and I wanted to make a certain shaded relief map using gdal calc. There are two steps to the operation. First of all, I have a hillshade that I created using gdal hillshade. ...
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Performing (semi)automatic export of several maps at once using QGIS

I am trying to do automatic export of several maps on weekly basis. There will be input data for every day of the week and on the end of the week I want to export 7 maps. I tried the Temporal tool but ...
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GPX File - Local Time off by 1 hour

I created a GPX file using a Bad-Elf GPS Pro (A tracker that is not a cell phone). My coordinates are correct and the times are shown in UTC, and the UTC times are correct. All is well, but when I ...
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Finding if point is in polygon then taking attribute from polygon dataframe and inserting it as a column in the point dataframe

I'm doing some GIS analysis in Python for COVID work. I've geocoded our entire membership (gdf_schoolAgedChildren) base and captured their locations in a shapely point data type (for each member). I'...
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Join Features by temporal relationship between a feature class (with spatial information) and a database file (without spatial information)

I need to identify locations for events that happened at certain time. These events are stored in a database file with date and time information (one event per one record). ID Date Time Event_no 1 1/...
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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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4 votes
2 answers
119 views

How to trigger calculation on QGIS startup?

I am preparing a field worker / QField project an would like to visualize green spaces based on the days that have elapsed since the last field worker has visited that site. I am testing with a very ...
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How to compute an n*n time matrix in R if n points with longitude and latitude is given?

The basic idea here is, I will provide a dataframe with name/id, longitude and latitude as input and will be able to generate a time matrix. osrmTable from the osrm package is doing the intended job ...
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Record time for each vertex of line in QField

I use QField 1.9.5, and QGIS 3.16, and I use GeoPackages to record vector data in QField. I use a line layer to record my track. I also use QField to record photographs taken with my tablet as points. ...
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How to find a old business that doesnt exist anymore on Google Maps / Google Earth

Is there a way to "travel in time" on Google Maps or Google Earth to see the businesses from a particular year from a particular location?
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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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2 votes
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Finding points in one layer within range of time of points in another layer using QGIS

I am very new to QGIS and SQL. I have two layers, each is populated with points and temporal data. One layer has information on battles occuring in Iraq and Syria, and the other has information on ...
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Time Manager on LizMap

We published a project under Ubuntu Server, QGIS, LizMap web client, .. Everything works except the "time manager". Under the desktop client, the time manager works correctly (for example ...
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3 votes
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Temporal Manager raster animation monthly instead of days in QGIS

I have raster files on a per month scale over several years. I struggle to create an animation that shows monthly changes. I would like to have an animation showing each monthly raster file (and my ...
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268 views

Temporally reducing image bands using Google Earth Engine

I am trying to temporally reduce an image from 365 bands (daily) to 12 bands (monthly). Context: I imported an image collection with Soil Moisture (SM) that had 8 values per day (every three hours). I ...
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3 votes
1 answer
366 views

Timeout while uploading large files in GeoNode / GeoServer

I am getting timeout while uploading large files in GeoNode ( System Configuration : GeoNode 3.1.0 , GeoServer 2.16.2 installed on Ubuntu 18.04. ). I tried compressing large files to decrease their ...
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2 votes
1 answer
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How to build isochrones with GeoTools?

It is possible to compute shortest paths with GeoTools with its graph package. Is there a package (or extension) for computing isochrone lines or areas, that is the area which can be reached from a ...
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Mapping Tobler's hiking function with additional impediments using ArcGIS Desktop

Is there a way I can use Path Distance in ArcMap to calculate Tobler's Hiking Function with a DEM but also with additional time costs from non-slope impediments? For example, part of the landscape I ...
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Test intersections with time indicators in R

I have a sf object with MULTIPOLYGONS that refers to flood episodes from 1800's onwards(https://data.gov.uk/dataset/16e32c53-35a6-4d54-a111-ca09031eaaaf/recorded-flood-outlines). Then I have another ...
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How many GPS-Satellites are needed for time synchronization without positioning

Is it possible to do time synchronization without positioning with only 1 GPS satellite? If not, how many satellites do i need for time synchronization without positioning?
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6 votes
1 answer
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Converting double values into time in QGIS's Field calculator

How can I achieve the following result (in column "output", string) in QGIS attribute table? The values in "duration" were calculated with some other formulas and represent a ...
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2 votes
1 answer
157 views

How to calculate Night Flight time for a given flight between 2 locations?

I am currently working on a project (web app) at university to be able to calculate the amount of time spent during night flying. Currently, I have, Departure Lat and Long and Departure Time in UTC ...
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1 answer
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Comparing cities polygon over time using Nightime lights [closed]

I am currently generating polygons of cities in India over time based on night light data. For this, I have been using the clump function in R and then converting them to polygons. My issue comes when ...
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3 votes
1 answer
469 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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489 views

Converting Unix epoch time to GMT time using QGIS Field Calculator

I am trying to convert the 'time' and 'updated' column from epoch to date/time GMT but I am struggling to do so. I know I have to use the field calculator tab but I am a basic at using scripting. I am ...
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Time-Based Multilateration

I'm not entirely certain, but I think this forum is most appropriate for this question. I know the location of three observers. A nearby source, who's location is unknown emits a beam of radiation at ...
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1 vote
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55 views

PyQGIS return Field

I have this layer: I'd like to have a label that changes in time, I have a function that gives back the current time in the same format as my field names but gives back a string, not a field. What ...
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1 answer
220 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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6 votes
2 answers
277 views

PyQGIS Temporal Controller current moment

I have a QGIS Project with Temporal Controller, in Python Console. How could I capture the current moment of the simulation? I'm trying, but doesn't work canvas = iface.mapCanvas() temporal= canvas....
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Get an average image, but the time of each pixel is different

Change image is an array image,he stores the time node of each pixel.time1 and time2 are the first node and the second node of each pixel, respectively.I want to get the NDSI average value of each ...
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2 votes
1 answer
749 views

How to add a Timeline tool to Time Lapse in GEE?

I have been struggling to add a timeline tool to a time-lapse video I put together on GEE... The last part of my code is: var polygon = ee.Geometry.Rectangle([-XX,-XX,-XX,-XX]); //xMin, yMin, xMax, ...
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2 votes
0 answers
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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
1 answer
159 views

Convert decimal time to use in QGIS

I have a .shp file with includes a column of format Double that is the Arrival time. The time values entered are decimal time. For instance, 1 record has a decimal time of 7.11194, which converts to ...
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2 votes
1 answer
704 views

MODIS 'system:time_start' format problem in Google Earth Engine

In Google Earth Engine, what is the default format of time_start for MOD10A1 image?For example, var modisCollection = ee.ImageCollection('MODIS/006/MOD10A1') .filterDate('2000-08-21', '2001-02-28')...
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1 answer
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Buses movement data visualization in QGIS

What is the easiest way to visualize the movement of city buses in QGIS, as it is shown at this website? https://anitagraser.com/2020/05/24/movement-data-in-gis-30-synchronized-trajectory-animations-...
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1 vote
2 answers
212 views

Converting time in nc files

I have nc file where time unit is expressed as year and month in format "month as %Y%m.%f", type: character. For example, 199604.5 represents the year 1996, month 04. How to convert time in date ...
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How best to relate historical testing data to a shapefile?

I am tasked with bringing what has historically been only tracked in Excel into a shapefile. I am using ArcMap, but also have QGIS installed on my computer What these shapefiles will include is ...
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2 answers
1k views

Converting local solar time to UTC for MODIS

I am having a hard time to convert local solar time to UTC for MODIS data. According to the Users' Guide of the product (MOD11A1 Product - Wan Z., 2013), local solar time given for each pixel is ...
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2 votes
1 answer
233 views

Set 'system:time_start' in Earth Engine

I have an image collection(image) with 'system:time_start'. My function(iterate) is to get [img1, img1+img2, img1+img2+img3, img1+img2+img3+img4, img1+img2+img3+img4+img5]. But after I calculated, I ...
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2 answers
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What is the time interval for daily GPM IMERG product? 0:00 to 23:59 local time? UTC?

I'm processing a bunch of GPM IMERG Daily products and comparing to historical station data. These old met stations report daily precip from 9am to 9am of the following day. So I'm wandering what is ...
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1 vote
1 answer
327 views

Enabling Time on raster layers in ArcGIS Pro

I have several raster layers (all tiffs) in ArcGIS Pro and I would like to enable Time on each layer. This was straightforward in all versions of ArcMap 10 but not so here it would seem. As ...
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4 votes
1 answer
985 views

stars package in R. How to add time dimension in a stars object?

I have a raster stack (my_stack) and I converted it into a stars object: mystar <- st_as_stars(my_stack) That results in: stars object with 3 dimensions and 1 attribute attribute(s), summary of ...
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1 answer
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Adding time band as year to NDVI composite

I try to add time band to my NDVI time-series and using this function (took it from developers guide), for regression calculation. It looks like script is working but magnitude of slopes is extremely ...
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