Technologies used in Emapic

First of all, we want to remind you that Emapic's survey engine source code is publicly available through our github repository under the Affero General Public License V3 license.

Server-side technologies

Emapic is a web application built on Node.js, a server-side runtime environment based on JavaScript.

Aside from the core libraries provided by Node.js, in Emapic we use explicitly the following ones:

These Node.js libraries use, among others, the following technologies independently from Node.js:

• Template engine Hogan.js.
• Scripted headless browser PhantomJS.
• PNG images compressor OptiPNG.
• Audio and video toolset FFmpeg.
• Antivirus ClamAV.

For the database we use:

• PostgreSQL as DBGMS.
• Spatial database extender PostGIS.
• Natural Earth Data as a source for countries' and states/provinces' data.
• Sqitch for the database model versioning.

Client-side technologies

Our webpages load the following JS+CSS libraries from CDNJS:

We also use the next JS+CSS libraries served from our own servers:

We use the following additional fonts in our stylesheets:

We use additional images downloaded from the following sources:

Map tiles are loaded from the following sources:

• OpenStreetMap for both the color and black & white maps.
• Mapbox for the satellite imagery.

External online services

The following external online services are being used by our Emapic website:

• Contents sharing through AddToAny.
• Login through Facebook.
• Login through Google.
• Approximate geolocation of the user with its IP address through ipgeolocation.
• Reverse geocoding with Nominatim.
• Website visitor analysis with StatCounter.