Questions tagged [time]
A nonspatial continuum in which events occur in apparently irreversible succession from the past through the present to the future
258
questions
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1answer
30 views
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-...
1
vote
1answer
27 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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0answers
21 views
How does the runtime of Haralick texture generation scale with the number of bins/gray levels? (Orfeo)
I'm trying to generate some Haralick textures of various LiDAR-derived elevation models (digital height models and digital surface models). Because the height models (DHMs) have a lower bound of 0 and ...
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0answers
22 views
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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vote
2answers
112 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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vote
1answer
39 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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2answers
15 views
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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1answer
66 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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1answer
194 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 ...
1
vote
1answer
35 views
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 ...
4
votes
1answer
91 views
Find nearby points in space and time
I have a table that has an ID, point geometry and time. It's basically GPS coords and some other data. I want to be able to select all rows that interact (come close in space and time) to my target ID....
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0answers
61 views
Create isochrone along a given road
I want to solve this problem :
given a departure point
given an arrival point
given an amount of time
In which areas can I go while coming from departure to destination in the given amoint of time?
...
1
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2answers
61 views
Which time format does ESA use for Sentinel-3 file names?
regarding the ESA Sentinel-3 file name convention I have got a question; which time zone (GMT, CEST, ...) does ESA use? I could not find anything yet, even it should be a critical point for many users....
3
votes
1answer
70 views
How to add a time component in a heatmap?
I have a point file extracted from an AIS network. 1 year is about 900 million points. Each point has a timestamp.
I want to make a heatmap for a longer period of time, but I want the heatmap to take ...
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0answers
18 views
Are Sentinel-2 L1C temporal images already radiometrically normalized?
I am working on a project wherein I need to compare Sentinel-2 L1C images of an area on different dates.
I want the Time series images to be radiometrically normalized.
Are they already normalized? ...
0
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2answers
75 views
Calculate time duration from military time with ArcMap Field Calculator [closed]
I have two text fields (STRTTIME, ENDTIME) which are are formatted as military time with leading zeros. For example, 0540, 1655.
I want to calculate a new field with the time duration as integers (...
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0answers
32 views
Shift time in NetCDF files
I have a folder which contains (monthly) nc files from January 1980 to December 2015 with hourly data for different compounds (such as PM2.5, O3, NO2, NO, etc).The time is in UTC as follows:
int ...
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0answers
75 views
Daily averages in local time from UTC
It has been almost 2 weeks since I started getting familiar with netCDF files and operators (NCO) and climate data operators (cdo) and I am not an experienced programmer.
I have a folder which ...
1
vote
1answer
69 views
Mapping with time frame symbology in QGIS?
I am using QGIS 3.8, and I am making a map of archaeological sites. My table looks something like this:
NAME - Coordinates X - Coordinates Y - Site_type - Data_type - Century_begin - Century_end
...
3
votes
1answer
130 views
PyQGIS output to specific layer
I have a Python script that I have exported from a QGIS model and I want to specify the layer it creates as output.
If defaultValue=None it outputs 'Reportpmbc': '...
2
votes
0answers
74 views
Getting travel time while performing pgrouting i.e. what are parameters and function required?
While doing the pgrouting to find the shortest distance I got success in getting the output but when I thought to come up with the time consumed for travelling, I cannot find the proper source to get ...
2
votes
1answer
434 views
How long is a GPS epoch in microseconds?
My GPS is reporting dates from the previous epoch. How many microseconds should I add to the date to get the correct value?
Since the 2019 GPS Week Number Rollover, my old GPS logger (QStarz BT-...
1
vote
1answer
251 views
What is Time of Validity in a GPS System?
What is time of validity in a GPS system? For defining time of validity, there are only a limited definitions available. My interpretation for time of validity is the built-in system time (like on ...
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0answers
31 views
How to include duplicate samples (same locations, different temporal sampling) in Geographically Weighted Logistic Regression? [closed]
I want to assess local most important predictors for a specific event within a region. The same locations (grid) were all sampled in two different time occasions.
I am assuming predictors to be ...
3
votes
0answers
46 views
Time series condition through field calculator [closed]
I am attempting to filter some time stamped data which I have enabled through the Convert Time Field tool, depending on a true/false condition. I am doing this through the field calculator within ...
2
votes
1answer
323 views
Does GPGGA have leap second correction?
I'm trying to use GPS clocks to synchronize some measurements and I'm a little confused about the leap second correction between GPS time and UTC. I was wondering - does the GPGGA NMEA header have the ...
0
votes
1answer
66 views
Selecting points in polygon in a range of time (ArcGIS)
I have:
- point GPS for people (time in seconds)
- buffer GPS for a car (time in seconds)
What I want to do is for each buffer GPS coordinate, I want to find the number of GPS people points inside ...
0
votes
1answer
288 views
Using raster stack function time in R?
I successfully ran a function over a smaller test raster stack (48 layers) in about 30 minutes but cannot run it over my large stack (1462 layers). The last one I tried over the large stack ran from ...
0
votes
1answer
124 views
Google Earth Engine -hourly timestep
Does anybody know how to select 3-hourly time steps in a dataset on Google Earth Engine?
Here is what I have tried
// A function to compute CF_solar for every time step at which irradiation and ...
1
vote
0answers
84 views
Unsupervised classification in ERDAS imagine
I am trying to make a classification to run some index ( like NDVI) to see the change over time using the image difference function. Is it possible to do an unsupervised classification on one image ...
1
vote
2answers
149 views
Converting 12-hour time to 24-hour time in QGIS
I have a data set with hours such as 8am to 6pm.
I would like to convert this from 12 hour clock format into 24 hour clock format.
So instead of "8am to 6pm" I would want "08:00-18:00"
Does anyone ...
4
votes
1answer
66 views
How to determine the right time of Landsat 8?
Sorry, please help me clarify this issue.
Assume that I have information from a Landsat 8 image with the time shown as below:
Start time: 2018:288:03:13:25.1532590
Stop time: 2018:288:03:13:56....
0
votes
1answer
476 views
How to calculate the Min & Max value for a pixel from multiple Raster Images?
I have downloaded a Bunch of MODIS MOD13Q1.006 Images for my Study Area, covering a period of 4 years (same scene across time).
Now I want to calculate the Min & Max NDVI value for each Pixel, so ...
0
votes
1answer
26 views
How to get the most current data from a Temporal Feature Service?
I have created a Temporal Feature Layer on our ArcGIS Server, which records all the locations, along with timestamp & other attributes of moving vehicles.
I used the TimeSlider Sample, to create ...
1
vote
3answers
162 views
Converting hours to acceptable FME format?
I have an Excel document with a 'time' column. I need to get this column into an appropriate format for FME to convert the values to minutes.
The problem is that the cells are in different formats (h:...
1
vote
2answers
53 views
Unable to update time frame on layer in ArcPy?
I'm working on a script to ingest some data, create some data layers with it, and publish that to ArcGIS Server.
Most of that is done with no problem, but I got a new requirement today, time-enabling ...
0
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0answers
23 views
Time lapse not showing features ArcMap 10
I am trying to use ArcMap 10 to visualize air quality data. I have created a shapefile with values of measurements of PM2.5 on an interval of 15 minutes each. The total data accounts for circa 3000 ...
1
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1answer
33 views
Select Entrys by Time
I want to select entries of my GPS-Point data only recorded from 7 a.m. to 7 p.m. and close out all others. Right now, its in a String format (00:00:06).
I tried "time": >= '07:00:00' and "time": &...
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0answers
65 views
Change polygon color over time by number of events in polygon
In ArcGIS Desktop 10.5.1, I have a layer of XY events with a date field, and a layer of polygons. I have spatial joined the points so that each event is associated with a polygon. I want to show the ...
5
votes
2answers
1k views
Changing shapefile's field type using fiona?
I need to have a layer time-enabled for Esri application-making. Coming from the source, it has an int type column called year. I need to find a way to automate its conversion to date.
I first tried ...
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0answers
141 views
2.5D rendering time in QGIS
I have QGIS V 2.18.18
I am practicing making 3D maps and decided to do a simple population density 3D map for the states and territories of India.
I have a shapefile that contains 36 features(States ...
1
vote
1answer
331 views
Time-Aware Layer from ArcGIS Pro is not working in ArcGIS Online
I am using ArcGIS Pro 2.1 to share a web map with time aware layer on AGOL. When I publish the web map I get no errors but the field for time is missing when I open the map online. The time slider ...
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0answers
78 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 ...
2
votes
1answer
260 views
How to add time in geoserver layer with gsconfig
Find below the code I use to add a raster to geoserver through python3 with gsconfig-py3 (1.0.7)
What I do
from geoserver import catalog
from geoserver.util import shapefile_and_friends
from ...
0
votes
1answer
45 views
Changing Carto basemap according to timestamp?
I'm making an animated "time-map" of the avaibility of renting bikes during a day (on Carto).
Can I change the basemap so when it's day time the basemap is light and when it's night time the basemap ...
3
votes
0answers
61 views
Is it possible to add the time of editing to the table of a shapefile? [duplicate]
I would like to automatically track the time when a point is created or edited.
I first thought about virtual fields and the now() function. However, that field always contains the current time. So ...
2
votes
0answers
97 views
Processing time for Euclidean Distance [closed]
I am running a Euclidean Distance analysis on a large file. I have a polygon layer that includes all Urban areas in Canada, US, and Mexico merged into one multipart polygon file. I am attempting to ...
1
vote
0answers
48 views
Map service is published with wrong time info settings
I have a mosaic dataset and it contains GRIB data sets. I want to publish this dataset as a time aware map layer. For this I use ArcMap 10.5.1 and ArcGIS for Server 10.5.1 on Windows. Unfortunately I'...
3
votes
2answers
1k views
Calculating drive time in QGIS
I have more than 3000 points that spread in in a very big area. I need to find all the points (blue) that are in distance of 50 minute drive time, from the stores (green stars). I want to calculate it ...
1
vote
1answer
148 views
TimeManager UnsupportedFormatException
I am trying to use time manager to show patterns of movement for tagged wildlife. I have a GPS point with time and date every two hours.
Then, I select the layer with time manager, and select the ...
