Monthly Archives: June 2011

5.30 am: glacier monitoring ruminations

The downside of being a scientist rears it’s ugly head: it’s 5.30 am and I cannot stop thinking about glacier monitoring from space. Argh! This happens ever once in a while. I want to sleep, my body tells me it … Continue reading

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GIS Software: first thoughts on QGIS, SAGA and Arc

I have been experimenting recently with some GIS freeware. My start point for GIS testing is always raster processing: raster operations are a common task in my research and teaching and consequently the first functions I evaluate are the raster … Continue reading

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Landsat-7 ETM+ Visualisation in Quantum GIS (QGIS)

Here I will give a basic work flow for visualizing Landsat-7 ETM+ image data, from the USGS, in QGIS. The version of QGIS this is based on is the Windows v. 1.6.0 Capiapo installation. The data are a Landsat-7 ETM+ … Continue reading

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Space programs: science, vanity and national pride

Did you know that Nigeria has a space program? As part of the seven nation Disaster Monitoring Constellation (DMC) Nigeria launched a low Earth orbit (LEO) Earth Observation Satellite, Nigeriasat-1, in 2003 and will launch Nigeriasat-2, later this year. India meanwhile … Continue reading

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Abstract: Sannel and Brown (2010)

Here’s the abstract of the paper I mentioned in the previous post. A.Britta K. Sannel and Ian A. Brown. (2010) High-resolution remote sensing identification of thermokarst lake dynamics in a subarctic peat plateau complex. Canadian Journal of Remote Sensing, 36:S26-S40. Methods to quantify … Continue reading

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Image classification versus manual mapping

Classification is a common tool for deriving thematic information, such as maps,  from satellite imagery. A range of algorithms have been developed over the years; these are typically broken down into supervised and unsupervised methods. Supervised classification requires the user … Continue reading

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Glacier change in Norway

The conventional wisdom is that glaciers are retreating as a result of global warming. That is that glacier fronts are drawing back and consequently the glacier area is reducing. This is somewhat simplistic. Blåmannsisen is the fifth largest glacier on … Continue reading

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