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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QGIS TimeManager returning zero records

I am using QGIS 3.26 and TimeManager 3.6 and have imported a GPX file with ~10000 times in a qDateTime field called "time". Viewing the label and attribute table show these appear to be ...
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How may I retrieve the current date output from TimeSliderChoropleth (the one displayed in the slider)?

How may I retrieve the current date output from TimeSliderChoropleth? image showing current date displayed in the timeslider import folium from folium.plugins import TimeSliderChoropleth base_map ...
1 vote
1 answer
25 views

Change Time Format in QGIS

How can i change time format from 0.377777 to normal time 9:00 in qgis is there any formula or anything. I tried the entire conversion in Excel with custom format h:mm but it takes me a lot of time to ...
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1 vote
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USGS Multiple Dates listed and I want to know what they mean

I want to take a look at a piece of land over time and evaluate the change in topography over time. I am using USGS to download some data and I realized they give you a list of dates that correspond ...
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ArcGIS Pro Field Calculator: Updating each row with a minute added to previous time

I'm trying to update each row in my point shapefile with a date. What I want is the first row in my below table to read 7/14/2022 12:00:00 AM, second row to be 7/14/2022 12:01:00 AM, third row to be 7/...
0 votes
1 answer
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Time-enable a WFS to use on ArcGIS Online

Is it possible to time-enable a WFS with a date field properly coded as DATE in ArcGIS Online to use with the new timeline widget in Experience? If so, how?
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1 answer
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Space time nearest neighbor [closed]

I have a dataset with 3 coordinates time, latitude and longitude. How can I compute the nearest neighbor point for each point in the dataset using the 3 coordinates? I'm using Python but I can't ...
1 vote
1 answer
391 views

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:...
0 votes
1 answer
98 views

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 ...
0 votes
1 answer
22 views

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
239 views

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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93 views

Enabling time dimension for layers in GeoServer

I have a collection of GeoTIFF files, each one corresponding to a date and time. How can I add 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. ...
2 votes
0 answers
44 views

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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51 views

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 ...
0 votes
1 answer
1k views

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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2 votes
0 answers
65 views

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 ...
4 votes
2 answers
146 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 ...
0 votes
1 answer
96 views

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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1 vote
1 answer
651 views

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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38 views

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 ...
2 votes
0 answers
35 views

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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168 views

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 ...
3 votes
0 answers
70 views

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 ...
0 votes
1 answer
364 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 ...
3 votes
1 answer
442 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
63 views

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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0 votes
1 answer
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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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0 votes
1 answer
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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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0 votes
1 answer
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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
165 views

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
210 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 vote
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 ...
3 votes
1 answer
542 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 ...
1 vote
1 answer
591 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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1 vote
1 answer
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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 ...
1 vote
0 answers
57 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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2 votes
1 answer
270 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
322 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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1 vote
0 answers
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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
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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
19 views

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 ...
2 votes
1 answer
212 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 ...
2 votes
1 answer
863 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 vote
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
310 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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