bfast2/geebfastmonitor

Google Earth Engine implementation of the popular R bfast package

geebfastmonitor's Issues

Adapt BFAST Monitor for image collection processing

Details get here.
BFAST Monitor should accept ImageCollections when it is desired to run over regions larger than a pixel.

How to use the results

Hi

I have run the provided script and I got as a result an object with 4 propierties.
I would like to ask you how can I export, visualize, use the obtained results.
Many thanks for your help.

breakTime raster cannot be exported

I have no problems exporting the breakMagnitude band from the bfastResults object, but when I try to export the breakTime band, I always get the following error "Error: Array arguments must have same length along one axis. (Error code: 3)". I can visualize it partially (the breakTime band is partially rendered), but I also get the same error in the visualization. Can someone help me?

Data processing

Based on the Bfast algorithm, how to use NDVI tif files for spatiotemporal mutation analysis. What processing operations need to be performed on tif data?

The geeBfastMonitor does not analyze images past December of 2021

If I set the "monitoringStart-monitoringEnd" period to cover any date after 30-12-2021, no images are available. I think that the problem has to do with the Landsat image collections used being deprecated.

History and Monitor period

Hello,
I hope this email finds you well. I am interested in Bfast monitor. I really appreciate that you solved the issue in github that I was facing. I am following (https://github.com/bfast2/geeBfastMonitor) this documentation.

I was curious to know that in this algorithm, how to define the stable history and monitor period for each Pixel? My study area is in Belgium (31UFR tile).

• Do I need to define history and monitoring period separately for each pixel manually? Or, a general history and monitoring period would be ok for the entire area?

• If I have to define history and monitor period separately every time, how would I understand that like 2016 to 2019 was stable or 2016 to 2018 was stable history period?

• How to know that a break is detected in the monitor period?

I am sorry for asking so many questions. Still I would appreciate your suggestions in this regard.

Looking forward to hearing from you. Thank you.
Have a nice day.

Regards,
Sraboni

Implementing geeBfastMonitor with non-Landsat metrics

I would like to use geeBfastMonitor to detect change in a MODIS-based metric. Is there a simple way to overwrite the Landsat NMDI variable in the source code with a metric provided by the user?

For example, after importing the geeBfastMonitor module:

var bfast_in = require('users/andreim/geeMonitor:monitor.js');

Can I specify in the bfastMonitor() function a metric that I would like to use instead of the Landsat NMDI?

var result = bfast_in.bfastMonitor(roi,historyStart,historyEnd,monitoringStart,monitoringEnd,h,period,alpha,magnitudeThreshold,harmonics, ## MODIS-based metric ###);

If this is not possible and the source code in the bfastMonitor source code would need to be updated, is there a version of that source code that is scripted for MODIS data?

GEE BFASTmonitor simplified user-interface dates

Hi,

I am very excited to use the GEE BFASTmonitor, however I have been having play around on the App simplified user-interface:
https://andreim.users.earthengine.app/view/bfastmonitor and I am failing to look at other dates before 2015 and after 2018.
Is it possible to look at earlier dates?

Any help would be very much appreciated!

Array arguments must have same length along one axis. Issue described by @13675070160

As the picture shows that there have a problem When I export the GEE_Time_magnitudeOFchange. I found that Error: Array arguments must have same length along one axis.

create readme

at minimum, it must have:

• a description
• how to get started

Use module directly but encountering error : Invalid number (25:20)

I want to use this module directly to find whether there is a break on a pixel, but the error "Invalid number" occurred.
The parameters are the same as the original code you presented.

Here is my code:
https://code.earthengine.google.com/7bf71db0079d907ca2ac8e1958ecc033

var engine = require('users/andreim/geeMonitor:monitor.js');
var result = engine.bfastMonitor({
roi:ee.Geometry.Point(-60.00, -14.33),
historyStart:2013-01-01,
historyEnd:2016-12-31,
monitoringStart:2017-01-01,
monitoringEnd:2018-12-31,
h:0.25,
period:10,
alpha:0.05,
magnitudeThreshold: -0.000000000000000000000000000000121,
harmonics:1})

print(result)

Hope to get your reply soon!