MGiS

Planning to participate in the upcoming November Map Challenge and use ArcGIS Pro? Share it with us! Use " " & " " so we can discover and share your posts. Happy mapping!
About the Challenge: https://ow.ly/ymOH50XkALh

HOW LONGITUDE, LATITUDE AND TIME ZONES WORKS Latitude: These are horizontal lines that run east–west, measuring how far north or south a place is from the Equator (0°). Longitude: These are vertical lines that run north–south, measuring how far east or west a place is from the Prime Meridian (0°). Time Zones: Because the Earth rotates 360° in 24 hours, it is divided into 24 time zones. Each zone generally covers 15° of longitude, meaning local time changes by 1 hour for every 15° east or west of the Prime Meridian. Follow Geology forum 1 for more interesting educational contents. #geologyknowledge #theearth #longitude #Latitude #timezones #GeologyLovers #GeologicalWonders #geology

From satellites to solutions and honoring GNSS innovations! 🛰️

Today we celebrate International GNSS Day, honoring the crucial role that Global Navigation Satellite Systems (GNSS) play in our modern world. 🌐

This year, we especially recognize 30 years of European GNSS advancements, celebrating the continuous development of systems like Galileo, GPS, GLONASS, and BeiDou.

GNSS technology powers countless aspects of modern life – from aviation and transport to agriculture, geodesy, and more – enabling precise positioning, navigation, and timing. Today, we honor the pioneers who laid the foundation for this technology and look forward to the innovations ahead that will make our world even more connected, efficient, and data-driven. 🌟

If you are looking for a free learning opportunity for , The ArcGIS Imagery MOOC is now open!

https://ow.ly/7kq150XgxrZ

Start learning how GIS and imagery work together to enhance workflows—from visualization to analysis.

🌍 🌍 Top 15 Free Satellite Imagery & Earth Observation Data Sources (2025 Update)

Whether you’re a GIS analyst, remote sensing researcher, or environmental professional here are some of the best portals for accessing free satellite imagery and geospatial datasets 👇

1️⃣ USGS Earth Explorer
🌐 http://earthexplorer.usgs.gov
🛰️ Landsat (optical), declassified CORONA, Hyperion hyperspectral

2️⃣ Sentinel / Copernicus Browser
🌐 http://copernicus.eu/browser
🛰️ Sentinel-2 (optical multispectral), Sentinel-1 (SAR)

3️⃣ NASA Earthdata Search
🌐 http://search.earthdata.nasa.gov
🛰️ Land cover, atmosphere, cryosphere, biosphere products

4️⃣ NOAA Data Access Viewer
🌐 http://coast.noaa.gov/dataviewer
🛰️ Satellite, aerial imagery, coastal LiDAR

5️⃣ Maxar Open Data Program
🌐 http://maxar.com/open-data
🛰️ High-resolution disaster imagery, stereo, elevation, footprints

6️⃣ Geo-Airbus Defense
🌐 http://intelligence.airbus.com
🛰️ SPOT, Pleiades (optical), TerraSAR-X (radar), WorldDEM

7️⃣ NASA Worldview
🌐 http://worldview.earthdata.nasa.gov
🛰️ Interactive visualization of global scientific satellite data

8️⃣ NOAA CLASS (Comprehensive Large Array-data Stewardship System)
🌐 http://class.noaa.gov
🛰️ GOES/POES imagery, aerosols, ozone, environmental data

9️⃣ ISRO Bhuvan
🌐 http://bhuvan.nrsc.gov.in
🛰️ Indian satellite data: IRS, Cartosat, OceanSat, CartoDEM

🔟 JAXA ALOS World 3D (AW3D30)
🌐 http://eorc.jaxa.jp
🛰️ Global 30 m DSM / elevation from ALOS L-band radar

1️⃣1️⃣ NOAA Digital Coast
🌐 http://coast.noaa.gov/digitalcoast
🛰️ Coastal imagery, elevation, radar, socio-economic data

1️⃣2️⃣ PROBA-V MEP (GeoViewer)
🌐 http://viewer.probav.vito.be
🛰️ PROBA-V, SPOT-VGT, METOP — global vegetation trends

1️⃣3️⃣ Global Land Cover Facilities
🌐 (global land cover data sources via e.g. landsat, MODIS, AVHRR)
🛰️ Landsat, MODIS, AVHRR — global land use/land cover maps

1️⃣4️⃣ UNAVCO (SAR & Geodesy Data)
🌐 http://unavco.org
🛰️ SAR, tectonic deformation, geodesy data for Earth science

1️⃣5️⃣ INPE (Brazil’s National Institute for Space Research)
🌐 http://dgi.inpe.br
🛰️ CBERS, ResourceSat, UK-DMC — regional optical datasets

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For More info: https://medium.com/.remotesensingeducation/top-15-free-satellite-imagery-earth-observation-data-sources-2025-update-357f0feab062