Tuesday, 12 December 2017

Vectors are your friend, Part III

Esri just updated its World Vector Basemaps (v.2). I updated below the notoriously complex and details Aalan Archipelago offshore Turku, Finland. I contrasted in this blog 4½ years ago posting the GSHHG world vector dataset in giscloud.com, a web vector mapping system, and ArcGIS Online, richer in data but then in raster. See an OpenStreetMap backdrop earlier in my companion blog.



If you zoom in you see that GSHHG still has more vertices, but Esri's intent is a more accurate basemap. So you have the choice of full-on vector maps or full-enough vector basemaps.

Detail of above - note the scale - click to enlarge


The point is that for tens of dollars a month, AWS offers amazing performance on ¼M world vector datasets above, as well as ½M world point datasets from CLIWOC - also in 2014 London postGIS Day as "AWS for Megadata" - which you can then access on any web map browser, incl. arcgis.com's ever-increasing richness.

CLIWOC historic wind direction + force data (click to enlarge)

Monday, 11 December 2017

GeoHipster Calendar: 2018

This is my third Calendar entry from the most excellent Geohipster spearheaded by @atanas@billdollins and @gletham - the inaugural 2014 and the 2015 can be seen here - I missed last year but I told them:

Tuesday, 26 September 2017

Free tools & data to predict hurricanes

Four weeks ago I blogged here about the availability of open data, posting it on the open web and its potential social impact. Two weeks ago I blogged here too about tracking three hurricanes in the Caribbean via the brilliant but closed earth.nullschool.net. In between I compared & contrasted open & closed regimes on my Medium channel... and that 2½ yrs after a previous blog here on same!

Wednesday, 13 September 2017

Trio of Caribbean Hurricanes early Sept 2017

Evolution of Hurricanes Katia, Irma and José, and of Tropical Storm 57. Note how:
  • Katia developed late over Gulf of Mexico & stops shortly after head-on landfall
  • Irma is the strongest having developed over warmer S Atlantic then Caribbean
    • weakens to Category 3 on first Florida Keys landfall
    • strengthens again over western Gulf of Mexico 
    • immediately weakens at second Florida Coast landfall
    • still Cat2 (not shown) then finally Cat1 before degrading
  • José stays strong over water, strengthens briefly to Cat4-5 then swerves to W Atlantic
  • Tropical Storm 57 never materialised into a possible and feared hurricane three-punch

Friday, 1 September 2017

Saturday, 11 March 2017

Quarter million mark

Started August 2009, in 7.5 years almost 250 posts averaged 50 hits per day as shown below. That spreadsheet also lists my blogpost titles by hits and alphabetically by title.

Thursday, 9 February 2017

Thursday, 24 November 2016

AGI #GeoCom16 twitter report

[Update: LinkedIn Pulse post inspired by this: A non-anthropomorphic robotic future]

The AGI’s Annual Conference was held at the Royal Geographical Society (RGS IBG) in London yesterday. Here is a report by way of my twitter feeds, most recent ones first, from #GeoCom16: