archive

Archive for the ‘GIS’ Category

Why all world maps are wrong

Tuesday, January 24th, 2017

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Visual search tool for satellite imagery

Monday, June 6th, 2016

Terrapattern

Terrapattern is a fun prototype that lets you search satellite imagery simply by clicking on a map. For example, you can click on a tennis court, and through machine learning, the application looks for similar areas.

Changing river path seen through satellite images

Monday, June 6th, 2016

ucayali71

Sedimentary geologist Zoltan Sylvester downloaded Landsat data using Earth Explorer and strung together images of the Ucayali River to see the changes over thirty years.

Thanks to the Landsat program and Google Earth Engine, it is possible now to explore how the surface of the Earth has been changing through the last thirty years or so. Besides the obvious issues of interest, like changes in vegetation, the spread of cities, and the melting of glaciers, it is also possible to look at how rivers change their courses through time.

Flex Projector

Tuesday, January 12th, 2016

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Great tool to see the differences between different projections, with the differences visible for the latitudes too.

Projection Wizard

Tuesday, January 12th, 2016

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Get the right projection for a chosen extent, be it equal-area, conformal or equidistant.

The True Size Of A Country

Monday, December 14th, 2015

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Very interesting to see how countries “loose” size while dragging them over the earth. Due to the usual global projection, Greenland for example looks really huge, but, when compared correctly in size with African countries around the equator, it looks rather shrinked….

Live Global Data

Wednesday, October 28th, 2015

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Here.

Changing Projection (Center)

Wednesday, April 29th, 2015

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Interesting how the projection, or better the center and everything around changes dynamically, when one moves around

Water Stress Index

Tuesday, May 13th, 2014

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Really like that map. Maplecraft came out with a bunch of interesting maps. Wonder how they assemble and compute these different layers, for which normally such high-resolution data are not available.

Mapping the Global Footprint (on Biodiversity Loss)

Wednesday, November 27th, 2013

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Interesting website which “tracks” the impact on biodiversity loss through consumption.

Landsat Global Mosaic

Tuesday, June 11th, 2013

Nice online browser/atlas with Landsat global mosaic @ 14.5 meters (?).

Your Warming World

Monday, January 21st, 2013

Interesting, interactive map of the world from NASA to show global/local temperature changes.”The heat is on for the planet as a whole, but what has been happening where you live? Click a place on the map to find out, or enter a location in the search box in the top right-hand corner.”

Software Alternatives

Monday, June 25th, 2012

Very interesting website, where one can search for alternatives for specific software products. Type in ArcGIS, and one gets a full load of alternative software packages.

Cartogram: Somewhat Different Display

Monday, December 19th, 2011

“The map on the left and the cartogram on the right plot identical data. The only difference is that each hexagon on the cartogram represents an equal number of people. The two views give very different impressions: the big dark green patch on the middle-right of the map — representing a relatively sparse neighborhood — is shrunk to a single dark green hexagon on the cartogram. Meanwhile, the most deprived areas (dark purple) which look relatively small on the map are expanded to quite a few hexagons.” (from Junk Charts); corresponding article

GIS: Lots of Data

Friday, July 1st, 2011

Natural Earth is a public domain map dataset available at 1:10m, 1:50m, and 1:110 million scales. Featuring tightly integrated vector and raster data, with Natural Earth you can make a variety of visually pleasing, well-crafted maps with cartography or GIS software.

MODIS Blue Marble WMS

Tuesday, June 28th, 2011

To get from here as WMS service.

The Size of China

Thursday, March 17th, 2011

China is huge – in ppopulation, in GDP. Compare its provinces to other countries. Amazing!

Brisbane floods: before and after

Monday, January 31st, 2011

High-resolution aerial photos taken over Brisbane last week have revealed the scale of devastation across dozens of suburbs and tens of thousands of homes and businesses.

Convert GoogleMaps to Height Profile

Tuesday, January 4th, 2011

Really neat little app… Convert your GoogleMaps route to a height profile. Local download for backup reasons.

GoogleMaps – Why Are They More Readable?

Monday, December 13th, 2010

Interesting comparison of several mapping engines (GoogleMaps, Bing, YahooMaps) and what techniques Google is using to make their maps more readable.