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sort of our own fault or the people inputing the information and not defaulting the lat/longs to zero. quite often, the lat/long would not get changed so then you end up with 20 jobs at the same location. We once kept track of the lat/longs of jobsites but that managed to get screwed up since when we have repeat clients, job info sheets for past jobs are used to quickly fill out new ones to input in to the system. however, we always propose jobs like we don't have this capability since i have been in a situation where the gps malfunctioned in the field or something simply didn't work so then you resort to topo maps with a compass and pacing.
i have actually cut 2 days off 5 days worth of clearing/layout time before.
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if you're spending $100/hr for clearing equipment plus engineering time it saves a lot. you spend say 2 hours before you go out and you could cut field time down by 4 hours.
i would say that a gps can easily pay for itself in one subsurface job where clearing is required. you can even overlay actual site plans with the gps data points and tracks to confirm your location pretty close. plus, the reported vertical accuracy by usgs is 3m (soon to be 1m and the data is supposedly updated several times a year). the topo maps can be generated to any interval but i usually don't get tighter than 5' spacing just for onscreen clarity. i'm sure most of us have been in the woods looking at a quadsheet and trying to figure out which hill top you're on. we don't just follow the gps blindly but it definitely helps to confirm your location.
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we also generate our own topo maps using free software which can then download the topo to the gps. We use the good quality garmin's (60csx and 76csx) since the units have a superior antenna that picks up whether you're under heavy canopy, the unit is in your pocket, or even if you're inside buildings (reception varies depending on you locale but is generally <20' accuracy). RE: GIS applications in Geotechnical Engineering? geonebular (Geotechnical) 15 Aug 07 14:43 You may also find Surfer (surface and mesh generation) helpful, but it's also commercial. MS Word and Excel are very helpful at massaging data being transferred from one application to another. NRCS Soil Survey information can be had using the online viewer (maybe even downloadable, too).
Mine subsidence maps can also be had if you dig into state websites. Well records for water oil ad gas, for example. Even then, the geotech largely has no experience exploiting the information.įortunately, many US states and federal agencies are beginning to develop good-quality datasets that are available for low or no cost. Overlaying these locations on USGS topo maps can help you with the interpretation of what's fill/not fill, and approximating existing/historical surface elevations (boreholes are so rarely surveyed, a fact that disappoints me to no end).Ĭommercial-grade GIS systems (software packages designed for easy interoperability) can be very expensive, so they're generally not cost-effective for small projects and practically unheard of for large projects unless there is a deep-pocketed government agency (or mining company) involved as an owner/client or partner. I would typically use several applications to obtain layout or approximate as-drilled coordinates for borings. What information do you have that's relevant? How can you arrange the data spatially in order to provide you with an insight that you couldn't otherwise get? Be creative. RE: GIS applications in Geotechnical Engineering? 03LabGrunt (Geotechnical)
Obviously, this was very kludgy, but it did permit me to gain insights into the spatial relationships between the conditions encountered at the borings and other information such as USGS topo, air photos, planned construction etc.
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The remainder are available to be used under Windows or other "unregistered" (but crippled) licenses. GINT, Pathfinder Office and Bentley Redline are licensed commercial products.
.dfx file gps pathfinder office pdf#
Other handy software includes OmniFormat and MS Paint (for converting PDF images to a raster format) and A9CAD and Bentley Redline (for converting CAD files to DXF format). These applications do not play with each other seamlessly, so data from one application was exported and massaged to a suitable import format for the next as needed. Software that I have used to assist with previous investigations include gINT, Global Mapper (unregistered version), and Trimble's GPS Pathfinder Office. GIS software may be used in the context of an investigation, but is not necessarily limited to the geotechnical side of the project. GIS applications are not-discipline specific.
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