Infrared Photography

Saturday, 30 January, 2010

There’s a nice summary article covering infrared photography over at the BBC. It’s part of the celebrations of 100 years of infrared photography. If you read the article you’ll see that infrared has been known about for at least a further 100 years, but getting photographic film/plates that were sensitive to these wavelengths was difficult. That occurred around 1910, with commercial film from 1930.

Zoomable Map

Saturday, 23 January, 2010

Check out the Zoomable Map which uses a clever set of folds to give the effect of zooming in from an overview map to a streetmap. I can see this taking off for alot of city maps, so thought I would order the London one. Its not cheap but a really nice idea. I hope it takes off.

Trouble and strife with OS data

Thursday, 21 January, 2010

I recently had a map submitted to the Journal of Maps that made good use of Mastermap data. Although not an extensive amount was used, it is primarily based upon it so I suggested he check out the JISC-OS license with particular reference to my post on what this means for PDF based maps. He has described his experiences:

Trouble and strife with OS data

My map was created using terrain analysis of a Digital Elevation Model generated from airborne LiDAR data. In order to provide some context to the main feature of my map I used Ordnance Survey Mastermap data for features such as roads, railways, rivers and general land use. On reviewing my map the editor at the Journal of Maps suggested I should check whether the use of this data falls within the current OS licensing agreement. I discovered that my map was in breach of this agreement on a number of levels. Not only did my map include prohibited vector data, but the total number of pixels per image was over double that of the maximum set by OS at 1,048,576. I went through the pain staking process of trying to reduce the overall size of the images in my map so that they fell within the agreement terms, but the effect of rasterising the vector data resulted in a severe impact on the overall quality of the layers. It was at this point I decided it would be best not to use any OS data in my map.

Instead, I created my own layers by digitising the most important features (major road and rail routes, urban areas, and rivers) from airborne imagery collected for the study site. In this instance I was fortunate to have this data available, as other sources of imagery, such as Google Earth, are liable to have poor spatial accuracy. One vector layer which I could not digitise using the airborne imagery was an outline of the UK, used to identify the location of the study site. To overcome this I downloaded a UK coastline line shapefile from Open Street Map (available at Cloudmade). In fact the data available here also includes road and administrative boundary features that may be useful to other users.

The lessons learnt here are that the restrictions imposed by OS effectively make their data unusable in map making for publication.

Australia is BIG

Sunday, 17 January, 2010

For antipodean colleagues, yes Australia is BIG. A map always puts it in to perspective!

Big boys UAVs: RQ-4 Global Hawk

Saturday, 16 January, 2010

A nice article over at Wired on the diversion of US military UAVs to Haiti to provide reconnaissance imagery for the relief effort. Demonstrates how the miltary are trying to get some good PR whilst also making a genuinely useful contribution. If you haven’t come across military UAVs then take a look at the RQ-4 Global Hawk; makes somewhat of a mockery of the kites I use and even some of the more security centric products. Just take a look at some of the specs:

Length: 13.54 m
Wingspan: 35.41 m
Height: 4.62 m
Gross weight: 10,387 kg
Cruise speed: 650 km/h
Endurance: 36 hours
Service ceiling: 19,812 m

It can survey up to 100,000 square kilometer of terrain a day and carries SAR VNIR instruments on board. A serious bit of kit, but then they cost $35M each. Not sure a NERC grant would stretch to one of these!

Gentle Introduction to GIS

Friday, 15 January, 2010

GIS Lounge have a good summary of a Gentle Introduction to GIS, a PDF manual and accompanying datasets for use with QGIS. Sponsored by the Department of Land Affairs, Eastern Cape, South Africa, it covers the main introductory conceptual areas and provides examples. Its not going to win any writing awards, but it is nice and succinct. In that sense it complements the book from MapAction which covers somewhat similar ground for MapWindow.

With my educational hat back on, it will be interesting to see how schools around the world start picking up on these resources. Certainly in the UK the market is wide open with schools starting to look at software. Both QGIS and MapWindow could fill this introductory niche very nicely.

Students have 10 minute attention span

Thursday, 14 January, 2010

Students only have ‘10-minute attention span’ - it’s a great headline from the BBC and the first part of the copy reads: “University students have average attention spans of just 10 minutes and many miss lectures because of the need for part-time jobs, research suggests.” Actually, the 10-minute attention span is a pretty well known phenomena; John Medina outlines this in Brain Rules (amongst other things) and discusses how he structures 1 hour lectures in to 15 minutes blocks to leverage attention spans. So not so much a real headline as a storm in a teacup.

Very small world map

Wednesday, 13 January, 2010

A world map with a difference - this one is only 40 microns (that’s about the same as the wavelength of thermal infra-red light) in in size! This one is done using CMOS fabrication tools and put on a chip. Nice :)

Importance of Geography

Tuesday, 12 January, 2010

Nice article over at The Economist espousing the importance of Geography (with a big “g”) and it’s centrality to everything important that is going on in the world. Of course, I would at to that that GIS underpins a very large part of the data collection, analysis and presentation of much of what goes on in geography.

Snow covered UK

Friday, 8 January, 2010

It’s already been flagged up on the BBC, but a Terra MODIS image captured a nearly cloud free, almost totally snow covered, UK yesterday. It’s quite simply stunning and is available from the MODIS Rapid Response System which provides near real-time access to MODIS imagery on Aqua and Terra. This particular image is the highest resolution (250m pixels) version and is available with a worldfile meaning it can be loaded straight in to a GIS.