![]() ![]() Hiding in a directory ( >Granule>Img_Data) will be the JPEG2000 images (.jp2) of the various Bands needed to create images. The size of the images depends on their resolution – see table below - got to love 10m resolution data for free! Landsat, ASTER and other remote sensing data are also available here. The video below will get you started: ![]() Sentinel-2 data is available on the USGS EarthExplorer website (you need to register to download data) and reasonably simple to download. Also, a new Landsat has been launched so that might be worth checking out as well. – are also integrated. I would love to be able to do stereo/3D interpretation but can’t quite justify the dollar outlay. aerial photography is less used, and I find Sentinel-2 data is my “go to” to create images for interpretation – and it’s free. ASTER, which is my old go to, is also useful but doesn’t have the resolution of the Sentinel data. Note Sentinel is only one of the datasets I use – aerial photography, Bing Maps, Google Earth, radiometrics, geology maps, DEM, LIDAR, shuttle radar, contours, soil maps, etc. to create a first pass regolith landform/geomorphological map. These days with the advent of Google Maps, etc. So how do we start? In ye olde days (the 1990’s) we used to use stereo aerial photography, Landsat satellite data, airborne radiometrics, etc. ![]() The key thing for me is the boundary between transported and “in-situ”. This is a rubbery boundary of where I’m reasonably confident surface sampling will be effective and where surface sampling may / will not work. Note the qualifications: rubbery & reasonably – not hard and fast – I’m not going to crucify anyone that takes one or two samples of transported material. Now the statement referencing surface sampling on transported terrain not working may incur the wrath of those who are adherents to partial leach & other techniques on transported material. Please, put that aside for the moment – I’ll address this at the end of the post - as I do the “ Do-Re-Mi” – let’s start at the very beginning (apologies to Julie Andrews and the cast of the Sound of Music). So, what is a regolith map? First, I think we should start with what is regolith. I like the definition “everything between fresh rock and fresh air”. So that encompasses soil, saprock, saprolite, alluvium, colluvium, elluvium, weathered rock (difficult for those educated on glaciated terrains I appreciate), till, lake sediment, etc……Ī regolith map to me is like a geomorphological map but simplified with an exploration “edge” added. Excellent work by the CSIRO in Australia during the 1980s/1990s assisted in the recognition of the value of this style of mapping as a first pass exploration tool and assisted in the discovery of multiple gold deposits in Western Australia. Have you noticed that a number of the Star Wars stories revolve around maps? In Episode IV (the first one), R2D2 is hiding a map of the Death Star which enables the Resistance & thus Luke Skywalker to discover the secret to its "destruction". In Episode VII, BB-8 (the millennial R2D2) is protecting the missing piece of the map that will lead to Luke Skywalker. This missing piece allows Rey to discovery Luke on a distant planet where she’ll begin her training as a Jedi – or so she thought….Ī bit of a funky segue but I see regolith mapping as the “missing piece” that will enable geologists to sample – surface & sub-surface – with a more powerful “force” that will lead to “discovery”. And stop wasting time and money! ![]()
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