News - ImGRAFT

New matching method: Orientation correlation

posted Sep 19, 2016, 9:58 AM by Aslak Grinsted [ updated Sep 19, 2016, 10:06 AM ]

A new method has been added to the templatematch function: "Orientation Correlation". A comparison between Orientation Correlation and Normalized Cross Correlation can be seen on the right.

Orientation Correlation was possible before with the toolbox but required a pre-processing. See the FAQ.

GeoTIFF / GeoJP2 support

posted Nov 19, 2015, 12:22 AM by Aslak Grinsted [ updated Nov 19, 2015, 12:23 AM ]

I have written a function called geoimread which lets you read sections of a large geotiff or GeoJP2. I recently managed to workaround a mapping toolbox dependency in geoimread, and for that reason I have now included it in ImGRAFT.

Additionally we have included two other functions called animatepair and alphawarp. animatepair is useful for inspecting image pairs and troubleshooting. alphawarp is a helper function can help you drape your results semi-transparently over a background image.

Updated ImGRAFT paper published

posted Feb 11, 2015, 8:17 AM by hobbit north [ updated Feb 11, 2015, 8:22 AM ]

Our updated manuscript outlining the ImGRAFT toolbox has now been published in the

journal Geoscientific Instrumentation, Methods and Data Systems.

The paper includes numerous new figures that aid the explanation of the ImGRAFT processing chain.

Take a look here...

Citation:

Messerli, A. and Grinsted, A.: Image GeoRectification And Feature Tracking toolbox: ImGRAFT,

Geosci. Instrum. Method. Data Syst., 4, 23-34, 2015, doi:10.5194/gi-4-23-2015

2014 velocity and flux for five major Greenland outlet glaciers using ImGRAFT and Landsat-8

posted Dec 21, 2014, 4:11 AM by Aslak Grinsted [ updated Dec 21, 2014, 12:19 PM ]

Our second paper using ImGRAFT is now in discussion in the Cryosphere discussions. In this paper we apply ImGRAFT to Landsat 8 images to measure the velocity & discharge of five major outlet glaciers in Greenland. We get some exciting results, but will wait talking about them till the paper is accepted.

For now you can take a look at the discussion paper here.

ImGRAFT paper is in discussion

posted Aug 29, 2014, 4:50 AM by Aslak Grinsted [ updated Aug 29, 2014, 4:51 AM ]

http://www.geosci-instrum-method-data-syst-discuss.net/4/491/2014/gid-4-491-2014.html

Our manuscript on the ImGRAFT toolbox is in discussion for the relatively new EGU open access journal Geoscientific Instrumentation, Methods and Data Systems.

Citation: Messerli, A. and Grinsted, A.: Image GeoRectification And Feature Tracking toolbox: ImGRAFT, Geosci. Instrum. Method. Data Syst. Discuss., 4, 491-513, doi:10.5194/gid-4-491-2014, 2014.

3d plots and how to export results

posted Jul 10, 2014, 2:30 AM by Aslak Grinsted [ updated Aug 29, 2014, 4:46 AM ]

I have added an illustration of how you might visualize the output of the feature tracking in 3d in matlab.

I have also added a section which shows how you can export the feature tracking output if you want to use it with ice tools.

More examples of ImGRAFT

posted Jul 9, 2014, 2:58 AM by Aslak Grinsted [ updated Aug 3, 2014, 3:11 AM ]

I have included the Batura, Schneefernerkopf, and Bindschadler examples in the toolbox in addition to the Engabreen demo. The data files for these new examples will be downloaded on demand in order to minimize the download size of the toolbox itself.

I have also implemented a work-around for a matlab clipping plane bug that was affecting the templatematch progress window.

Unveiling ImGRAFT to the world.

posted Jul 6, 2014, 11:37 PM by Aslak Grinsted [ updated Jul 7, 2014, 12:17 AM ]

ImGRAFT has been unveiled. (plus we have fixed some cosmetic issues in the code.) We are happy that there appears to be some interest in our toolbox (see the map of sessions over the weekend).

Download and try it out.

Please provide feedback. Report bugs and missing features. Are there rough spots in the documentation? And if you can contribute with code or fixes, then please do.

It would also be great with some non-cryosphere examples.

Engabreen example

posted Jun 23, 2014, 4:45 AM by Aslak Grinsted [ updated Jul 7, 2014, 1:46 AM ]

The Engabreen example is long and covers alot of ground. As such it is probably the best place to learn about many aspects of the toolbox. It is here.

More examples can be found in the documentation..

Documentation pages up

posted Jun 23, 2014, 4:39 AM by Aslak Grinsted

A first go at the documentation pages has been written. Please go take a look.