June 10, 2020
by chris
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When i announced the Green Marble mosaic version 2 mosaic recently i mentioned that the land coloring is based on MODIS data while the water color is created from Sentinel-3 data. There are multiple reasons for this choice of data … Continue reading
April 18, 2020
by chris
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Like almost everyone else i have been constrained in my work and life during the past weeks due to the global pandemic we are experiencing and the measures enacted to counter its spread. I used parts of this time to … Continue reading
July 30, 2019
by chris
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I have a bit of a backlog of 3d views i have not yet introduced here on the blog and which i am trying to work through in the next few posts. The first is a set of globe views … Continue reading
July 15, 2019
by chris
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Someone at some point in the last few weeks seemed to have managed to put the idea into the mind of journalists that there are wildfires burning in the Arctic and this being a exceptionally newsworthy story somehow. These reports … Continue reading
December 13, 2016
by chris
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Based on my initial look at the Sentinel-3 data (see part 1, part 2 and part 3 for the details) here some comparitive assessments relative to the existing MODIS/VIIRS systems. As indicated in the title this is for OLCI, i.e. … Continue reading
December 11, 2016
by chris
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This post in the third and likely last part of a report on the recently released Sentinel-3 level 1 data from the OLCI and SLSTR instruments. The first part provided general context, the second part discussed the data distribution form … Continue reading
September 17, 2016
by chris
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In connection with assembly of satellite image mosaics i mentioned the effect of sun glint in satellite images in a recent post and want to elaborate a bit on this here. Sun glint is a common phenomenon in satellite images … Continue reading
January 31, 2016
by chris
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Writing about the spectral sensitivity of the Sentinel-2 satellite system and the implications this has for images generated from it i realized a broader discussion of the matter is in order. Creating images with realistic colors is one motive for … Continue reading
September 19, 2014
by chris
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The Green Marble global color mosaic i introduced recently allows producing 3d views of areas where previously available image data was not suited for high quality images. Here are a number of perspectives i wanted to do for quite a … Continue reading
August 17, 2014
by chris
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As a byproduct of producing the Green Marble mosaic a global vegetation data set was generated as well. I now processed this further for use in maps and also designed a new map style focussed on vegetation for showing this: … Continue reading
July 31, 2014
by chris
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I am happy to announce the availability of the Green Marble global satellite image mosaic. Previously i showed partial coverage of Europe and the Arctic with this satellite image assembly. It took some time to complete this for the rest … Continue reading
May 31, 2014
by chris
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Yesterday the Sangeang Api in Indonesia started a major Eruption. Here a MODIS image from NASA worldview showing the large ash cloud which already extents over several hundered kilometers.