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juliusmall

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About juliusmall

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  1. Eternal fascination of the satellites.... You cannot penetrate hundreds and thousands of meters of water with an actual and reliable (from the satellite body) energy..... As an example the light from the sun is completely adsorbate after something, perhaps around a hundred meters. At the moment they are some methods of investigation, from an airborne platform by a special LIDAR, Green LIDAR.... But only for the near shore areas...... PS. I am seeing a demand like this: "I want to undertake a study concerning old prospecting using satellite data. Was requesting more inf
  2. @rahmansunbeam Thanks for the tip. I will check..... The project is not available now, long market story. But I know the place by heart..... That hole after the ridge was a nightmare for me because of a critical chain of exclusion ( a pipe, crossing the mountains, at a limited angle, a maximum elevation, etc). But as I wrote before, I made some merges of the two data sets SRTM and ASTER. The result was something like a smallpox affected skin, but with a perfect rectangular pattern. Obvious a offset of the elevations. I observed this on large surfaces. Sorry to discard
  3. Ambitious........ To merge SRTM and Aster.... Personally I worked with SRTM and ASTER somewhere in west Africa, near the Ecuador, - 2 latitude area. 5000 sqkm the biggest exploration permit. ASTER was full of artifacts, something like "small circular spots" (difficult to understand the origin, perhaps the clouds traces) and lines/shadows in a rectangles grid, probably the connections at the limit of the original data tiles, the swats. Also, big "holes" with more than 200 m elevation drop, almost vertical, from a mountain ridge. Not existing in SRTM; because it was a critical
  4. I think is related to the two main option for surfaces calculus from MI. They are exposed , as an example, at general settings in older MI: you have the option to calculate a surface in "cartesian" or "spherical" . In the new versions this is more hidden. In your case, I think that you are working in a long/lat system, perhaps WGS84; this one is entering in the so called spherical calculus, and you have this as implicit (the screen capture). The cartesian calculus are exposed as options. You must chose, evaluate carefully what you need, what you are targeting in the
  5. Usually they are more..... In happy cases, from the state...Otherwise, a militia....
  6. 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, p
  7. Hi Paolo Are you asking (or your employer) miracles from remote sensing, and especially with free resources, like LandSat. Have you check the cloud coverage in your target area ? You can identify only favorable areas (alluvial fields like meanders, cone shapes, etc). At the Landsat resolution will be difficult..... Then, quatre quatre pieds, meaning foots on the ground and sampling. It is a long process painful lounge and expensive: collect around 200 l of alluvial, concentrate by panning, then carefully observe the heavy minerals associations. A lot of samples like t
  8. @Capricorn Perhaps you haven't understand. I am not giving data to other to post processing. Just sending people to work in the field according to our goals. I suppose also your urban planing layouts are put in place by some people, starting with the architects, engineers etc and finishing with the last shovel guy. I am returning to the definition: GIS.... Geographical Information Systems. That System from the end is including far, far more than a collection of maps, layouts, etc. ArcInfo maybe it is ended far more powerful, full of analyses capabilities, etc. But it was started
  9. I can tell that MI+Discovery is an essential tool in the exploration and mining industry. Example: I can generate in less than a hour a grid for soil geochemistry and in the second hour to load in the GPS units the coordinates and send people to work. No such module in Arc. And they are a lot of such specialized modules in MI/Discover It is not about the core MI vs Qgis,it is about the final products. Same in geophysics, you will never find Qgis or Arc, you will find products processed in Geosoft..... Same in the oil industry. Other families, not Qgis or Arc So, see what you a
  10. I converted one time a grid in an ers format and the altitudes were exploded. In which step do you have these inflated elevations ?
  11. Probably is expensive: http://www.photosat.ca/mapping-services/30cm-accuracy-topography-mining.php?&utm_source=infomine-mining-com&utm_medium=web-ad&utm_campaign=mining-com-world-map
  12. Forget. A lot of Garmins are using also a barometer sensor. The 72 I think, it has a menu for skydiving...... But on a tablet is different of course
  13. Using a GPS, a Garmin 62sc on a boat near the shore: the error was less than 6 m. Error in theory, because they are other factors also: tide, the error of GPS system itself...... Place: Africa, 2 degrees south from equator
  14. You can try ecw compression format. It was real increasing the speed. Some simple thinks, digitizing large scanned maps. But the speed of redrawing was real fast after compression. Your software must support the ecw format Regards
  15. I think W32 is a dead end...Only 3.something gb memory used by the system, So, only an office Pc or something. The most interesting for me is the multi core capacity
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