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Showing content with the highest reputation since 09/27/2020 in all areas

  1. The all-virtual Esri User Conference 2021 just dropped the curtain after a four-day event. Here's whats new. Everything new explained by Jack Dangermond. ArcGIS Image is a software for remote sensing over cloud. ArcGIS Velocity gets real-time data visualization maps. ArcGIS Enterprise installation using Kubernetes. More experiments with field survey. 😑 More integrated BIM for ArcGIS. Maps SDK for game developers. Cool presentation though! What's new in ArcGIS Online.
    2 points
  2. Six years ago, we compared ArcGIS vs QGIS. The response was incredible and we thank you for that. But since then, the game has changed. Yet, the players are still the same. The Omen of Open Source GIS is back with QGIS 3. It’s up against the Pioneer of Proprietary GIS, ArcGIS Pro. Buckle up. Because today, you’re going to witness a head-to-head battle between the juggernauts of GIS software. Pick your poison. Table of Contents 1. 3D 2. Interface 3. Coordinate Systems 4. Catalog 5. Editi
    2 points
  3. NGS has developed a new beta tool for obtaining geodetic information about a passive mark in their database. This column will highlight some features (available as of Oct. 5, 2020) that may be of interest to GNSS users. It provides all of the information about a station in a more user-friendly format. The box titled “Passive Mark Lookup Tool” is an example of the webtool. The tool provides a lot of information so I have separated the output of the tool into several boxes titled “Passive Mark Lookup Tool — A through D.” I will highlight several attributes that I believe will be very useful
    2 points
  4. Earth is known as the “Blue Planet” due to the vast bodies of water that cover its surface. With an over 70% of our planet’s surface covered by water, ocean depths offer basins with an abundance of features, such as underwater plateaus, valleys, mountains and trenches. The average depth of the oceans and seas surrounding the continents is around 3,500 meters and parts deeper than 200 meters are called "deep sea". This visualization reveals Earth’s rich bathymetry, by featuring the ETOPO1 1-Arc Minute Global Relief Model. ETOPO1 integrates land topography and ocean bathymetry and provides
    2 points
  5. On February 7, 2017, the twentieth and final inclination (Delta-I) maneuver of Landsat 7 took place. (Delta-I maneuvers keep the spacecraft in the correct orbital position to ensure it maintains its 10:00 am ± 15 minutes mean local time (MLT) equatorial crossing.) Landsat 7 reached its peak outermost inclination boundary of 10:14:58 MLT on August 11, 2017. Landsat 7 is now drifting in its inclination and will fall back to 09:15 am MLT by July 2021. The chart below illustrates the inclination trend from June 2014 to June 2026. The USGS and NASA are planning
    1 point
  6. Many of Africa’s agricultural endeavors have long been tied to whims of the weather. When it rains, a country’s gross domestic product might soar. When it doesn’t rain, economies suffer. The reliance has been driven in part by the perception that dry, arid Africa has limited water resources. But a new study, years in the making, shows a different reality. As one South African scientist recently noted, if all the rainfall stopped today and for the next 100 years in Africa, there would still be plenty of water stored underneath the continent’s surface, it just wouldn’t be evenly distributed
    1 point
  7. Classification of precipitation change regimes based on changes in the precipitation mean state and variability. Shading indicates the ratio of change in precipitation variability and mean precipitation. Climate models predict that rainfall variability over wet regions globally will be greatly enhanced by global warming, causing wide swings between dry and wet conditions, according to a joint study by the Institute of Atmospheric Physics (IAP) of the Chinese Academy of Sciences (CAS) and the Met Office, the UK's national meteorological service. This study was published
    1 point
  8. A global land cover GeoTIFF was recently released by Impact Observatory (IO) and Esri. To create this geospatial layer, hundreds of thousands of satellite photos were classified into ten unique land use/land cover (LULC) classes using a deep learning model in partnership with Microsoft AI for Earth. Sentinel-2 imagery was used to divide the world into ten categories of land use cover: Water (areas that are predominately water such as rivers ponds, lakes, and ocean) Trees (clusters that are at least 10 meters high) Grasslands such as open savannas, parks, and golf courses
    1 point
  9. While the concept of “deepfakes,” or AI-generated synthetic imagery, has been decried primarily in connection with involuntary depictions of people, the technology is dangerous (and interesting) in other ways as well. For instance, researchers have shown that it can be used to manipulate satellite imagery to produce real-looking — but totally fake — overhead maps of cities. The study, led by Bo Zhao from the University of Washington, is not intended to alarm anyone but rather to show the risks and opportunities involved in applying this rather infamous technology to cartography. In fact t
    1 point
  10. From space, large decks of closely spaced stratocumulus clouds appear like bright cotton balls hovering over the ocean. They cover vast areas—literally thousands of miles of the subtropical oceans—and linger for weeks to months. Because these marine clouds reflect more solar radiation than the surface of the ocean, cooling the Earth's surface, the lifetime of stratocumulus clouds is an important component of the Earth's radiation balance. It is necessary, then, to accurately represent cloud lifetimes in the earth system models (ESM) used to predict future climate conditions. Turbulence—ai
    1 point
  11. A recent analysis of the latest generation of climate models — known as a CMIP6 — provides a cautionary tale on interpreting climate simulations as scientists develop more sensitive and sophisticated projections of how the Earth will respond to increasing levels of carbon dioxide in the atmosphere. Researchers at Princeton University and the University of Miami reported that newer models with a high “climate sensitivity” — meaning they predict much greater global warming from the same levels of atmospheric carbon dioxide as other models — do not provide a plausible scenario of Earth’s fut
    1 point
  12. The Indian Space Research Organisation opened its space calendar 2021 with the successful launch of PSLV-C51 carrying Amazonia-1 and 18 other satellites on Sunday. PSLV-C51 carrying Amazonia-1, an optical earth observation satellite from Brazil, and 18 other satellites lifted off from the first launch pad at Satish Dhawan Space Centre in Sriharikota at 10.24am. Around 17 minutes after lift-off and one minute after the PS4 engine cut-off, PSLV placed its primary payload -- 637kg weighing Amazonia-1 – in a sun synchronous polar orbit. After placing Amazonia-1 in the orbit, the rocket coas
    1 point
  13. February 18, 2021 Each year more than 180 million tons of dust blow out from North Africa, lofted out of the Sahara Desert by strong seasonal winds. Perhaps most familiar are the huge, showy plumes that advance across the tropical Atlantic Ocean toward the Americas. But the dust goes elsewhere, too—settling back down in other parts of Africa or drifting north toward Europe. A dramatic display of airborne dust particles (above) was observed on February 18, 2021, by the Visible Infrared Imaging Radiometer Suite (VIIRS) on the NOAA-20 spacecraft. The dust appears widespread, but
    1 point
  14. Google Maps for Android is one of the most actively developed Google apps, with new features and improvements routinely being added to the navigation app. In the last two months alone, the app has gained quite a few functionalities, including a new community feed, a Go tab for accessing frequently visited places, messaging for verified businesses, a new driving mode, and food delivery alerts. The app will also soon start showing COVID-19 vaccine locations in the US. Now the Google Maps on Android is picking up a new split-screen UI that makes it easier to navigate in the Street View mode. This
    1 point
  15. You’d be forgiven for thinking that receiving data transmissions from orbiting satellites requires a complex array of hardware and software, because for a long time it did. These days we have the benefit of cheap software defined radios (SDRs) that let our computers easily tune into arbitrary frequencies. But what about the software side of things? As [Dmitrii Eliuseev] shows, decoding the data satellites are beaming down to Earth is probably a lot easier than you might think. Well, at least in this case. The data [Dmitrii] is after happens to be broadcast from a relatively old fleet of s
    1 point
  16. gdf.to_crs(epsg:4326) worked in the end. Had to spend a while troubleshooting my environment and geopandas' dependencies to get this to work. Thank you!!
    1 point
  17. Yes, I want to add a point in existing Postgres table but via qgis (digitize it) by adding exact coordinates (XY) values. In ArcGIS, I can do that by using Absolute XY (F6). I know how to do it in qgis by using a plugin name LatLon Tools. The issues is those latlon tools cannot be used to add coordinate when when the data is called from the Postgres database.
    1 point
  18. Flow maps are cartographic visualizations to show the movement of objects, people, or other living things from one location to another. Lines, usually symbolized with an arrow to indicate the direction. Color coding or line width can also then be used to indicate the volume of objects that are moving from one location to another. Airline traffic, animal migration, commuters, and import/exports are all common types of geographic data that are typically shown on a flow map . Ilya Boyandin has developed an easy-to-use online tool called Flowmap.blue that takes location data stored in Google
    1 point
  19. The Sea of Galilee (also known as the Sea of Tiberias, Lake Tiberias, Lake of Gennesaret, and Lake Kinneret), located in northeast Israel, is the world’s lowest freshwater lake. After the Dead Sea, the Sea of Galilee is the world’s second-lowest lake in the world. The lake measures 21 kilometers (13 miles) north-south, and it is only 43 meters (141 feet) deep. Most of the inflow of water to the Sea of Galilee arrives via the Jordan River from the north, although some underground springs drain into the lake. Water levels have been dropping for the past two decades, reaching a nearly a
    1 point
  20. On November 21st, Sentinel-6 was launched by the European Space Agency (ESA) using a SpaceX Falcon 9 rocket. The satellite was developed in partnership with NASA and other agencies and was named after former NASA Earth Science Division Director Michael Freilich.[1] The recent launch of Sentinel-6 Michael Freilich/Jason CS is the latest mission that will collect sea level measurements at more frequent intervals to monitor the effects of climate change on our oceans. With one of the biggest threats of climate change being the rise of ocean levels, this represents an important tool for scie
    1 point
  21. all done, enjoy and don't forget, please more active
    1 point
  22. To meet the most ambitious 1.5º C climate goal requires a rapid phase-out of fossil fuels and mass use of renewables. However, new international research by the Institute of Environmental Science and Technology of the Universitat Autònoma de Barcelona (ICTA-UAB) warns that green energy projects can be as socially and environmentally conflictive as fossil fuel projects. While renewable energies are often portrayed as being environmentally sustainable, this new study cautions about the risks associated with the green energy transition, arguing for an integrated approach that redesigns energy sys
    1 point
  23. there is also a new tool in arcgis pro called "Pixel Editor" if you need to correct the values for this tool you need the Image analyst license. https://pro.arcgis.com/en/pro-app/help/analysis/image-analyst/editing-elevation-pixels.htm depending on your task or your licence you can also use the "Raster Calculator" (needs spatial analysis). For example if you have a polygon with the elevation data and you want to substitute the values on your raster (polygon to raster, then use the conditional function > con() https://desktop.arcgis.com/en/arcmap/10.3/tools/spatial-analy
    1 point
  24. In some ways, drilling into Antarctica’s ancient ice is easier than interpreting it. Today, more than 2 years after presenting the discovery of the world’s oldest ice core, scientists have published an analysis of the 2.7-million-year-old sample. One surprising finding: Air bubbles from 1.5 million years ago—from a time before the planet’s ice age cycles suddenly doubled in length—contain lower than expected levels of carbon dioxide (CO2), a possible clue to the shift in the ice age cycle. The CO2 levels are “amazingly low,” says Yige Zhang, a paleoclimatologist at Texas A&M Universit
    1 point
  25. A new study shows that increased heat from Arctic rivers is melting sea ice in the Arctic Ocean and warming the atmosphere. The study published this week in Science Advances was led by the Japan Agency for Marine-Earth Science and Technology, with contributing authors in the United States, United Arab Emirates, Finland and Canada. According to the research, major Arctic rivers contribute significantly more heat to the Arctic Ocean than they did in 1980. River heat is responsible for up to 10% of the total sea ice loss that occurred from 1980 to 2015 over the shelf region of the
    1 point
  26. The International Maritime Organization (IMO) has issued a resolution for maritime cyber-risk management, effective January 2021. IMO Resolution MSC.428(98) affirms that maritime operators need to address cyber threats that risk the integrity and availability of technology systems. GPS/GNSS signal jamming and spoofing expose the vulnerabilities of PNT-reliant systems. The single point of failure in the signals used to synchronize military operations or determine a vessel’s location leaves maritime systems open to attack. With resilient PNT, maritime and naval vessels can rely on trusted d
    1 point
  27. I’ve seen similar results in SAGA GIS using the “Multi Direction Lee Filter” tool. http://www.saga-gis.org/saga_tool_doc/7.1.1/grid_filter_3.html
    1 point
  28. Hello everyone, a nice plugin for Chrome or Firefox which shows a new satellite imagery (from Google Earth) every time you open a new Tab.. Experience a beautiful image from Google Earth every time you open a new tab. Earth View displays a beautiful landscape from Google Earth every time you open a new tab. Chrome : https://chrome.google.com/webstore/detail/earth-view-from-google-ea/bhloflhklmhfpedakmangadcdofhnnoh?hl=en Firefox : https://addons.mozilla.org/en-US/firefox/addon/earth-view-from-google/
    1 point
  29. These are some of the most common geographic misconceptions that are both surprising and surprisingly hard to correct. https://www.nationalgeographic.com/culture/2018/11/all-over-the-map-mental-mapping-misconceptions/
    1 point
  30. geemap is a Python package for interactive mapping with Google Earth Engine (GEE), which is a cloud computing platform with a multi-petabyte catalog of satellite imagery and geospatial datasets. During the past few years, GEE has become very popular in the geospatial community and it has empowered numerous environmental applications at local, regional, and global scales. GEE provides both JavaScript and Python APIs for making computational requests to the Earth Engine servers. Compared with the comprehensive documentation and interactive IDE (i.e., GEE JavaScript Code Editor) of the GEE JavaSc
    1 point
  31. the best bet if you find free data programs, you submit a research and get the data, I saw once Tandem-X offer this programs. for now, a completely free DEM data stuck in 30 m resolution, anyone have another update maybe? hey tandem-x have a general proposal programs, maybe you can try it : https://tandemx-science.dlr.de/ scroll down
    1 point
  32. hi, why do you use landsat 7 and not landsat 8? and with witch software? here you can see the band combination for landsat 7 and 8 http://landsat.usgs.gov/L8_band_combos.php http://web.pdx.edu/~emch/ip1/bandcombinations.html so the band combination for TM is 1-4-7 in Landsat 7, the combination can be 7-6-4 http://www.harrisgeospatial.com/company/pressroom/blogs/tabid/836/artmid/2928/articleid/14305/the-many-band-combinations-of-landsat-8.aspx you load every single band in ArcGIS and you do a combination then do a classification (supervised or unsupervised)
    1 point
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