Andrew Map selection

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Saturday, 6 September 2014

On joining and merging historic multi-lingual geodata

Earlier posts chronicled the history even the beauty of historic shipping and climate data from CLIWOC. British, Dutch, French and Spanish maritime agencies transferred paper logs to digital records. In doing so look-up tables allowed to convert multi-lingual records into quantifiable attributes. Something odd (to me) happened in the process of mapping these: over 1/4M records doubled to almost 1/2M when look-ups were joined and then wind and direction tables merged to create maps symbolised by wind force and orientation.



Data are posted online for free re-use, to allow the geodata-oriented to view and possibly comment, if anything odd happened in the way I treated CLIWOC data. This is a very rich dataset, and the cleaner it can be made, the easier it will be for climatologists to pick it up and study historic data. Do go ahead and don't be shy!

Wednesday, 27 August 2014

The happenstance art of maps

I showed recently how CLIWOC weather data from ships captains logs dating 1662 to 1885 totalled almost 1/2M points. It started with a 1/4M ships tracks, and combining look-up tables from four maritime agencies they yield numeric wind force and direction...

Friday, 15 August 2014

Dynamic maps final (for now)

[Update: longhand version posted on my catalog blog]

This is the end installment of progressing from static to dynamic maps online. A few lessons learned along the way on posting a quarter million point dataset, which ballooned to almost half a million after links & joins...

Saturday, 9 August 2014

Lessons from 'static to dynamic maps'

Last month related the stumbling blocks in posting too much data on arcgis.com - time animation pushed the limits of stock web service even when limits are set above 250K points - and other services don't offer animation as yet.

Sunday, 27 July 2014

From static to dynamic web maps, continued

Last month I reported on posting on arcgis.com some time-stamped, time-slider or time-aware maps - I showed my WhereIsAndrew map - I also mentioned how time-sliders are a great way to roll-up diverse datasets that are time dependent. CLIWOC Captain's ships logs was the other example cited, and I proceeded to post it as a service from ArcMap on arcgis.com.

Saturday, 14 June 2014

From static to dynamic web maps, my travel so far

I tell people "I know just enough java to be dangerous", and it has served my well in my prior attempts logged in my old web page. These were all Google Maps API v.2 I built about 5 years ago. This blog as well as my new map catalog showed how I built maps in QGIS then ArcGIS, and then posted them on giscloud.com and AWS via Mapcentia GeoCloud2. I recently posted maps on arcgis.com on desktop and smartphone, static results of 'traveling salesman' geoprocessing on the desktop or online.

Saturday, 10 May 2014

Handy maps

[Update 3: see the traveling salesman problem executed for just a portion of it.
Update 2: see the traveling salesman problem executed for the post code area.
Update1: see the social map created from this on a custom arcgis.com account.]

A 'handy' is what Germans call a mobile or cell phone. I uploaded free ArcGIS for Android on my  smartphone, which now has a decent screen to read maps on - love my Navigon Europe on it, and Google Maps too - but here is a quick&easy application of arcgis.com for the rest of us. 

Sunday, 30 March 2014

... now HOW open is open?

A lot of (virtual) ink has flowed around opening up data, as in this blog, GISuser crowdsourcing open data (below left) etc. etc. And everyone is getting into the act, from White House (below center) and Whitehall (UK Cabinet Office) to the number of open data hits (below right).

Sunday, 16 March 2014

Sunday, 23 February 2014

Global Sailings (1662 - 1856, English, Spanish, Dutch, French) revisited

I originally extracted CLIWOC (CLImatological database for the World's OCeans) ship captains' logs ships locations over a decade ago, to demonstrate the processing of 250K+ points in ArcGIS desktop using then new File Geodatabase. Five years later I posted this on my old website with instructions how to use it in  old ArcGIS Explorer and KML, and then I put a layer package on arcgis.com - both related historic details like de laPerouse's demise below, the importance of data standards and metadata, and the interst it generated elsewhere - more recently I posted a time-based variation of same, where using a time slider helps clarifiy complex data on desktop GIS.