How Shinmoedake erupted

Originally posted on NATURE IN JAPAN:
On Friday last week, a lava dome about 50 meters in diameter was confirmed in the Shinmoedake crater. Shinmoedake is one of more than 20 volcanic peaks in the Kirishima mountain range. The magma is viscid, and is likened to the one at Fugendake peak in the Unzen mountain…

Freeware SAR processing (Part 1.)

One thing about working with synethic aperture radar (SAR) data is that regular image processing functions are often unsuitable. This is because most processes were design to deal with issues related to passive multispectral data in the visible-thermal infrared wavelength range. SAR imagery is derived from an active sensor which introduces particular problems or rather … More Freeware SAR processing (Part 1.)

Debugging in Python

Originally posted on Python Conquers The Universe:
As a programmer, one of the first things that you need for serious program development is a debugger. Python has a debugger, which is available as a module called pdb (for “Python DeBugger”, naturally!). Unfortunately, most discussions of pdb are not very useful to a Python newbie —…

Status of SRTM 1-Arc Second DEM Global

As we know Worldwide 30m SRTM data is releasing in phases, the figure below show current data distribution. The only missing area now is west Asia and northeast Africa. ( You could also check the current status in: To download this data, registration and search on USGS’s website: To be sure, I search data … More Status of SRTM 1-Arc Second DEM Global

Doris 9 – Segmentation fault: error in SNAPHU

In 64-bit operating system, SNAPHU may come into an segmentation error like this: snaphu v1.4.229 parameters input from file snaphu.conf (219 lines total) Logging run-time parameters to file snaphu.log Segmentation fault (core dumped) This is caused by ctime() function in src/snaphu_io.c file [1]. To solve this problem, edit this file, change “#include <sys/time.h>” into “#include … More Doris 9 – Segmentation fault: error in SNAPHU

Doris 8 – One dataset, one template

1. One interferogram, one template Doris uses 8 input.* files (input.m_initial, input_resample, etc.) that “run -g” command generates to setup parameters. It’s time consuming to modify them one by one for different interferometric pairs. However, we can merge those 8 into 1 and make a common input file (i.e. Env.dorisin) for the whole dataset. Read these … More Doris 8 – One dataset, one template

Phase Advance due to Atmosphere in InSAR

Effects from atmosphere, mainly due to troposphere and ionosphere, along with the temporal and geometrical decorrelation, are the major challenges of InSAR. Troposphere alone, could cause a differential phase signal equivalent to a real deformation of up to 20 cm, according to latest poster of H. Fattahi’s poster at AGU 2014 fall meeting. And ionosphere … More Phase Advance due to Atmosphere in InSAR