Geographic Information Systems

Questions tagged [time]

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

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4
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0answers
40 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? ...
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2answers
28 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
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1answer
56 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 ...
0
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0answers
13 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
42 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 (...
0
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0answers
26 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 ...
0
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0answers
60 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
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1answer
54 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 ...
2
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0answers
48 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
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1answer
107 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-...
0
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0answers
9 views

Point-distance analysis using time as an attribute

Is it possible to calculate "points within a certain buffer zone" for each point in a vector layer and do this by controlling time as an attribute field? I would like to analyse morbidity densities of ...
0
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1answer
48 views

Creating Drive Time Polygons In ArcMap?

I have a feature set of locations, made up of several points. I have the Network Analyst extension for ArcMap, and a feature set of all the streets in the area I'm looking at. How can I create ...
1
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1answer
81 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 ...
1
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0answers
25 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
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0answers
42 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
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1answer
137 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
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1answer
41 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
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1answer
147 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
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1answer
63 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
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0answers
69 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
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2answers
103 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
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1answer
59 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
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1answer
207 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
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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
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3answers
103 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:...
0
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1answer
25 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
21 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
61 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
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2answers
810 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
107 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
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1answer
195 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
61 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
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1answer
187 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
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1answer
41 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
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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
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0answers
75 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
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0answers
47 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'...
1
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2answers
937 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
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1answer
110 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 ...
2
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1answer
144 views

Use Milliseconds on Time Manager

I am trying to use Timemanager with my csv files which i loaded on my map as shp layer. those contain time staps which i tried in hh:mm:ss.fff hh:mm:ss:fff hh:mm:ss,fff and also each with 1 f - in the ...
0
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1answer
275 views

LeafletSlider plugin doesn't work

I downloaded the LeafletSlider repo https://github.com/dwilhelm89/LeafletSlider to test it out and then modify it to my needs, but when I open the index.html it doesn't have the slider as shown in the ...
-1
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1answer
1k views

Why meridian time zones are not uniform?

Looking at this image: Why are time zones are not uniform? (I mean not really parallel !!). For example, time zone -11 and -10 are pretty overlapping near Alaska and time zone 0 changes the form ...
3
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1answer
197 views

Merging 2 Isochrone Maps

Through the OpenRouteService, I've generated 2 driving time maps from 2 points approximately 60km from each other. Screenshots below - each colour represents 10 minutes. I'm trying to find the 'half ...
1
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1answer
93 views

Displaying time in the Date Field

How would one go about displaying the time that a feature was edited or digitized in a date field so as to display MM/DD/YYYY 12:00:00 AM in the attribute table?
1
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0answers
80 views

Is it possible to combine buffer zone analysis with time series analysis in QGIS?

There is a multitemporal analyzer in QGIS where it is possible to do a buffer zone analysis combined with time series analysis, where there are two layers an input layer and a target layer and the ...
2
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1answer
40 views

Symbolizing a file geodatabase layer using every attribute field?

I'm trying to export an animation using ArcGIS 10.3.1. I have monthly unemployment rate data dating back to 1990 for every county in the continental US. Each month's unemployment rates are stored in a ...
3
votes
1answer
111 views

Inconsistent performance using the tiger geocoder.

I'm testing the geocoder results for one state, and I'm getting different results for directions that seem to be well formatted. E.G. Geocoding these addresses is taking around 100ms each: 280 ...
5
votes
1answer
507 views

Converting DateTime field to another time zone?

I'm using QGIS 2.16.3 and attempting to convert a number of datetime fields that are appearing in the incorrect default GMT +0 timezone. I would like to add, for example, 10 hours to accurately ...
2
votes
2answers
937 views

Iterating Create NetCDF Raster Layer in ModelBuilder?

Recently I have updated my ArcGIS to 10.5 and I got stuck with a process that I used to do a thousand times before in 10.2.2 version. I need to calculate zonal statistics from rasters stored in ...

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