Solar eclipse below the horizon – the observation guideline

Solar eclipse below the horizon observation pattern

The 2024 total solar eclipse is coming. Anyone interested will be in North America. We cannot forget about the people, who live or will temporarily stay in Western Europe on the day when the event occurs. Therefore I decided to prepare the text, which presents the guideline for this specific kind of observation. The guideline … Read more

Downloading OpenStreetMap vector datasets effectively

OpenStreetMap data download to QGIS

OpenStreetMap platform is a worldwide free geographic database, updated and maintained by free volunteers. The primary advantage of this platform is the availability of the data, which can be downloaded anytime by the user unlike Google Maps, which requires appropriate payments. In fact, there are a few options for getting the GIS vector data from … Read more

The correct way of using QGIS Viewshed plugin

QGIS Viewshed plugin

Visibility analysis constitutes great importance in many fields such as sensor deployment, decisions for placement of mobile towers for maximum coverage, military operation planning, gaming, fire monitoring towers in the forest, urban design, landscape planning, etc (Saxena, Mundra, Jigyasu, 2020) or even for location graves (Lockwood, Masters, 2021). The explanations of the current text are … Read more

Using special characters in QGIS expressions

QGIS special characters

This brief text explains how to use some custom symbols in QGIS expression. Obviously, it applies only to the quoted part, which represents the bits with string. There are 2 ways of doing it. The first method uses the char() element, which can give us the desired symbol, letter, or icon. In the case of … Read more

12P/Pons Brooks comet during 2024 total solar eclipse

12 Pons Brooks 2024 total solar eclipse

This text shows some guidelines for the brief moment of the total solar eclipse 2024 occurrence at twilight, which presumably will allow for a fantastic view of the 12P/Pons-Brooks comet being close to its perihelion point.           1. 12P/PONS – BROOKS COMET – GENERAL INFORMATION 12P/Pons-Brooks is a periodic, Halley-type comet, … Read more

Folium Draw plugin – extended functionality

Folium draw plugin

The Draw is a very nice plugin dedicated to anyone who wishes to draw editable vectors on the Folium map. It’s a comprehensive plugin, that can add lines, polylines, polygons, rectangles, circles, circlemarkers, and markers and then edit or delete them. Its functionality is the same as in the Leaflet Draw plugin, where its Folium … Read more

The Google Earth FOV feature usage in long-distance observations

Google Earth FOV and Long Distance Observations

This article presents a nice feature in Google Earth, which lets on getting a telephoto view rendered from any location around the globe. Because the option is to be considered in the aspect of the long-distance observations, it’s indeed a continuation of the thread about the estimation of visibility between two artificial objects. That’s exactly … Read more

Quick access to Street View from various applications (based on Leaflet map example)

Street View access from various maps

Everyone knows how Google Street View is needed for the desktop investigation of various issues. It’s very beneficial since we have access to this Google product from another platform, certainly dedicated to some topic. Indeed, there are quite a few ways of getting the Street View visible at the same time when browsing the specified … Read more