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Showing most liked content since 05/22/2018 in all areas

  1. 2 points
    Styler is a new ArcGIS configurable application that can be used to easily create, style and share modern 2D and 3D map apps. Using simple styler parameters you can customize everything from the title, menus and text, to the overall color, theme and layout. The app is hosted on ArcGIS Online and GitHub so you can 1) style maps on-the-fly just by adding URL parameters or 2) if you have an existing web map or web scene, you can style (more advanced) apps step-by-step by configuring them with the new Styler template. Once styled, share your app at any time just by sharing the URL - no programming required. Styler is built with the new ArcGIS API for JavaScript v4, Calcite Maps and Bootstrap. The application is fully responsive and supports many features of the new JavaScript v4 API such as loading 2D web maps and 3D web scenes, displaying image and vector tile basemaps, showing legend and layers, positioning widgets on the view, and searching and finding places. The app can be accessed in ArcGIS Online and ArcGIS Enterprise or downloaded and hosted locally. How to style and share a map Open the default 2D map or 3D scene and zoom to or search for a place. e.g. "New York City" https://esri.github.io/calcite-maps-styler-template/index.html?webmap=default https://esri.github.io/calcite-maps-styler-template/index.html?webscene=default Click the Main Menu > Share, add URL style parameters and hit Enter to style your map. e.g. https://esri.github.io/calcite-maps-styler-template/index.html?webmap=default &title=New York City at Night &bgcolor=dark-blue &basemap=streets-night-vector &lat=40.72461 &lon=-73.99893 &zoom=12 Now copy and paste the URL to share your map with others. https://github.com/Esri/calcite-maps-styler-template
  2. 1 point
    Check my latest fixes (updated 20th June 2018) - http://www.mediafire.com/file/61joa3j8u4e51ii/list.txt
  3. 1 point
    Here help if viewshed analyst http://desktop.arcgis.com/en/arcmap/10.3/tools/spatial-analyst-toolbox/using-viewshed-and-observer-points-for-visibility.htm hope help and give an idea of the how to... regards
  4. 1 point
    yeah, this multibillion company make a sweet deal source : https://www.engadget.com/2018/06/04/microsoft-github-acquisition/
  5. 1 point
    The 21st Century Race For Space - BBC 15 May 2018 In this Film, Prof Brain Cox gets exclusive access behind the scenes at Virgin Galactic, Blue Origin and Spaceport America, exploring what is really happening in privately financed space flight right now. A new age of space exploration, and exploitation, is dawning. But surprisingly, some of the boldest efforts at putting humans into space are now those of private companies started by a handful of maverick billionaire businessmen. From space tourism to asteroid mining, and even dreams of colonies on Mars, these new masters of the universe refuse to limit their imaginations. But are private companies led by Jeff Bezos, Sir Richard Branson and Elon Musk really going to be able to pull this off? How will they overcome the technical challenges to achieve it? And is it really a good idea, or just a fool's errand? Cox meets key players in the story - Bezos, founder of Blue Origin as well as Amazon, and Sir Richard Branson, founder of Virgin Galactic. He wants to find out how entrepreneurs - and engineers - really plan to overcome the daunting challenges of human space travel. It certainly hasn't been easy so far. Jeff Bezos has sold a further billion dollars of Amazon stock this year to fund Blue Origin. Branson has been working on Galactic for more than a decade. Lives have been lost. And some companies have already all but given up. But real progress has been made too. The origins of the new space boom, the X-prize in 2004, proved that reusable space craft could be built by private enterprise. Now the challenge is to work out how to run reliable, safe, affordable services that will show a return on the massive financial investments. Sixteen years since Dennis Tito became the first civilian in space, Cox explores the hardware and companies that are aiming to make daily tourist flights to space. Beyond mass space travel, and even space mining and manufacturing, the dream of Elon Musk and others is true space exploration. His company, SpaceX, already delivers supplies to the International Space Station, and their next step is delivering astronauts too. But their true ambition is to ensure the survival of the human race by crossing our solar system and colonizing Mars in the next decade. Could commercial spaceflight companies eventually make us a space-faring civilization? Video Link
  6. 1 point
    @ASalas Also adding to pasfans01 answer 2., keep in mind that if you want to use NDVI for data assimilation puproses (e.g. compute vegetation biophysical parameters etc.) you will need the Surface Reflectance (Level 2A) data to produce the NDVI map, since 2A are more close to the true radiance values. For more information, you could read the sentinel 2 users guide that ESA offers. If you use the 2A data, in your case it would be of great help to first check the quality assesment data in order to see and assess the impact of cloud coverage in you scene. Regards
  7. 1 point
    1. For the shadow, it will make the NDVI values close to zero, whatever the landcover covered by it 2. for level 1C data, the digital number/reflectance is processed to top of atmosphere value, which means atmospheric effect is not yet corrected, and for level 2A, the digital number/reflectance has been corrected to surface/bottom of atmosphere reflectance (atmospheric effects has been corrected). Theoretically , the level 2A data will give more accurate NDVI values compared to level 1C,
  8. 1 point
    Hi upay82 Thank you very much for the technique to solve the problem. I have done it!!!! Thanks alot upay82
  9. 1 point
    I know by experience when i was visiting a project site in Western africa , if you see a black dude with an AK-47 near an alluvial areas, then that is where the Diamonds are. i hope that helps.
  10. 1 point
    Hi Paolo, Remember from my text: "collect around 200 l of alluvial, concentrate by panning, then carefully observe the heavy minerals associations". I saw some papers telling about 100 kg (the minimal I think). We were more conservative and prudent in some projects. It is a large quantity; depending on on the pan size, at least 10- 20 pans to wash. Finally, depending on the area, you will obtain some hundreds of grams of heavy minerals; among them, a lot without significance, like magnetite. And then, in less quantities: pyrope and eclogitic garnet, chrome diopside, picroilmenite, chromite; and, to a lesser extent, olivine . The indicators. These are the indicators about a kimberlite body. The kimberlite is decomposing fast and will leave this mineral traces in the alluvial, but diluted with other minerals, depending on the distance. It is what you are searching. Personal (from some sustained field experience, and also a lot of study for Remote Sensing or GIS) I don't think that you can discriminate those minerals, in such small quantities, basis on remote sensing, in alluvials. To few, in order to have a significant spectral signature. See an article, about the kimberlites* As a good help, starting from the satellite data, you can do a geomorphological analysis. Discriminate well and precise the hydrographic network, then to locate some favorable areas (terraces, dejection cones), for heavy minerals concentration. Among them, beside the indicators, you can find, or not, diamonds (3.52 SG). It is what I done, in my projects. Not Angola, but nearby. Then, to start exploring, as I wrote before, on the ground. Or direct mining, with the risks of acquiring heavy equipment and be without enough reserves. I don't know if you have an exclusive license; if yes, can you send me the coordinates, in order to see what it is available (satellite) for that area ? If you are prospecting, and the area is confidentially, please send something like an nearby area, one-two hundreds kilometers distance. They are some new satellite data and I want to see the confidence, if you are agreed. Regards, Iulian * http://www.hgimaging.com/PDF/Kruse_IEEE2000_Kimberlites.pdf "Higher spatial resolution data (1.6m AVIRIS and 4m HyMap acquired in 1998 and 1999, respectively) are being used to map additional detail. Poor exposures, vegetation cover, and weathering, however, make identification of characteristic kimberlite minerals difficult except where exposed by mining. "
  11. 1 point
    You cannot compare two software bluntly. ERDAS Imagine has it's own user group in commercial resource management and exploration sector. ENVI also has it's loyal customers in universities and private research groups. The reason ERDAS is so popular in Asia and other places because they have a very good marketing department set in these places. The reason why ENVI can't get out of the wish list is most of the American and EU graduates can't give up using IDL for so many engineering and technical studies. IDL is awfully interesting for geeks, sometime as powerful as Matlab. ITT corp has their money flow steady by its global network of big scale industries, ie. aerospace, transportation, defense, energy and industrial markets. Now ITT is one of 100 top contractor in USA. Intergraph corp is more focused in engineering and geospatial solution since it's beginning (may be that's why they are good at selling their products). ERDAS Imagine, being an adopted son for so many parents over time (starting from the universities of America and Canada) ended up with Intergraph after touching many big names in its path. During its journey the software inherits codes and ideas from many experts, started its algorithms written in Fortran and later rewritten to C, sometimes Python. Being closely tied with a robust Fortran-derived interactive language, ENVI is a cross-platform image processing monster hugely popular among academicians, engineers, geospatial analysts, modelers and programmers. If you are a novice image analyst, ENVI is your thing. If you are a power user, application builder, environmental model maker/ tester, medical scientist, even a rocket scientist you will find ENVI sitting in you pc. But remember, great power comes with great responsibilities. If you are a white-collar GIS analyst, ERDAS Imagine is your thing. This software has it's charm in doing small things quickly and in a stereotyped way. In Imagine, things are easy once you learn the names of the buttons. Every function has only one wizard so learning curve is flatter. If you are a hobbyist, professional with little or no geospatial background, lousy professor then Imagine is your tool. Consider taking a peek to the other big names attached (ie. GeoMedia) to know how Intergraph deals the 'other-part' of geospatial industry. As you can see, every one has their own vice and virtues. Choose wisely.

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