Digitize Polygon Vector Layers in QGIS

https://videos.qwast-gis.com/w/hgtkRiGNQxTJ8ibpisTV1g

Illustration by Augustin Hirschvogel, from Geometria (1543).

Source: SLUB

Available to buy as a print.

https://pdimagearchive.org/images/900c6d5b-125b-4c13-9b09-996990e19cfa

#diagrams #perspective #measurements #shapes #polygons #three-dimensional #geometry #art #publicdomain

#Maths #Polygons #Area

Just had this stupid thought, can anyone answer this? This is probably something well known? Like, totally obvious?

Suppose you have an equilateral triangle, with each side of length one. You take the area -- call it A(3) -- and divide it by three. You do the same with a 1x 1square -- A(4)/4 -- and then with a pentagon, etc.

What would this be for a circle? If you look at the series A(n)/n, with n→infinity, does that converge?

We have A(3)/3 = 0.144.., A(4)/4 = 0.25, A(5)/5 = 0.344. ...

😬

"Attorneys representing the family of Stacey Darden, an Altadena resident who perished in the Eaton fire, filed a wrongful death lawsuit Monday alleging that the software that Los Angeles County uses for emergency alerts was defective and failed to alert her to leave in time.

The complaint, filed more than 10 months after the Eaton fire engulfed Altadena, targets the emergency alert software company Genasys and blames the company's predesigned evacuation zones, or "polygons," for keeping residents east of Lake Avenue from getting timely evacuation orders the night of the fire"

https://www.aol.com/news/she-died-eaton-fire-her-233617578.html

#gis #polygons #evacuations

🏝️ Chaque île est unique.

Mais comment les représenter à l'échelle d'un globe ? C'est une question de taille... et de généralisation cartographique.

🔍 A l'échelle mondiale, représenter chaque crique devient impossible : les lignes côtières se simplifient, les détails s'effacent.

👀 Ces cartes révèlent la métamorphose de la géométrie selon l'échelle.

#30DayMapChallenge – J3 #POLYGONS
✍️ Clément Tychyj
📊 Admin Express IGN

Toutes les créations de nos agents : https://www.ign.fr/mag/30DayMapChallenge-30-jours-30-cartes-pour-celebrer-la-creativite-cartographique

For the third #30MapsInAMonth are three theoretical European full-automated luxury high-speed heavy-rail network maps based on population distribution. This uses H3 hierarchical hexagon library to aggregate @WorldPopProject population data into #polygons, creating a maximum spanning tree network using population-to-population edge-weights and names for major urban centres added using @EUCommission Global Human Settlement Layer data.

#rail #network #HighSpeedRail #stations #30DayMapChallenge

Illustration by Augustin Hirschvogel, from Geometria (1543).

Source: SLUB

Available to buy as a print.

https://pdimagearchive.org/images/ead2521f-0034-4d50-90e6-45d52cbbe71e

#diagrams #perspective #measurements #shapes #polygons #three-dimensional #geometry #art #publicdomain