Andrew Map selection

My web presence

Sunday, 27 July 2014

From static to dynamic web maps, continued

Last month I reported on posting on 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

Due to the large number of points I had to first circumvent the 1000 point limit un - it's mostly to maintain browser and server performance - it's quite easy to change when you publish the service from ArcMap. I was warned however by Esri support that I might reach performance issues regardless, and mega-datasets are really meant to be on ArcGIS Server not on ArcGIS Online. Sure enough even if I filter the data to a single nationality, the time slider cycles through time frames faster that the browser can refresh them from ArcGIS Online.

clkck image to enlarge or go direct to webmap

 So until I or Mapcentia mentioned last month add time-stamping capabilty on their postGIS backends, we're left with either loading data on servers ourselves, or posting data in time-slices, or posting layer packages as I've done earlier. QGIS also has time-stamping added now programmatically according to Anita Graser @underdarkGIS, tho I'm not sure how that translates server-side per Jo Cook's @archaeogeek caveat.

So better let the heavy pulling to some, while the light speeds gallop on...

(heavy-horse pulling and chuck-wagon racing from 2014 Calgary Stampede)

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 and AWS via Mapcentia GeoCloud2. I recently posted maps on 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 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 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 - 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.

Tuesday, 11 February 2014

Sunday, 2 February 2014

Map catalog page 4

My map catalog also works well to post new projects: added British Geological Survey web mapping services to East Anglia web map, in order to compare historic and current geology. The Snapshot format also give a variety of viewing options of the catalog.

Sunday, 26 January 2014

Map catalog continued

In my ongoing suite of posting webmaps in my new and fresh Mind the Map blog, here is another take on loading global vectore megadatasets but this time on Amazon Web Services direct via Mapcentia's GeoCloud.

Saturday, 18 January 2014

Standards & Metadata, Part VIII

My previous post on this topic stated how careful documentation and appropriate metadata high-grades any information that is shared online by giving origin, context and other information. It helps build bridges and I quipped a well-known tear down this wall that also closed my second last post on free data and apps.