- Storm Watch over USA with Stream Flood Status
- Happy New 2017 Year!
- Happy New 2016 Year!
- Изготовление 4х-электродной установки для почвенного картирования
- С Новым 2015 Годом!
- Tips and Tricks for linking data in ArcGIS
- Use of GPR in Agriculture
- Converting multiple KML files into geodatabase for GIS project in ArcMap Desktop
- 2D Dipole-Dipole Electrical Tomography with LandMapper
- Building geodatabase in ArcMap 10 Desktop
Экология
Storm Watch over USA with Stream Flood Status
landviser сб, 09/02/2017 - 22:38Below you should see interactive map with active hurricane tracking over USA (Atlantic and Pacific). Also Weather Radar with current precipitation, next several days flooding outlook areas. Different color square markers indicate major river flood status with links to USGS site showing up-to-date water level and projected flooding. Purple squares - major flooding on-going. To see legend and toggle layers click on >> in top left corner.
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Frequently asked questions (FAQ) on electrical geophysical equipment and software
landviser ср, 03/21/2012 - 16:57How to convert conductivity to resistivity?
Are there any difference between LandMapper ERM-01 and other equipment available on the market?
How your equipment calculates electrical resistivity?
How to calculate geometrical coefficient K?
Does electrical resistivity correlate with any soil properties?
Can your equipment measure electrical resistivity/conductivity in soil and water samples?
How to determine the depth of the measurements?
How to convert conductivity to resistivity?
Electrical resistivity (ER) is reciprocal to conductivity (EC) and results can be easily recalculated using formula EC=1/ER or vice versa ER=1/EC. Electrical resistivity is more convenient to use on non-saline soils, where conductivity can be mSm/m, while resitivity measures in 102-103 Ohm m range. 1000 Ohm m equals 1 mSm/m. You can find more conversions to ppm, TDS, grains of salt in this flyer.
Kids using LandMapper to measure soil properties
landviser пн, 02/04/2013 - 21:27Our first videos are accessible on YouTube now! Those introductory videos show how to use LandMapper for soil mapping and how simultaneously collect soil samples. It is so easy, even nine years old kids learned very quickly how to turn on the device and take measurements.
Story: Fourth graders from Bay Area Charter School in El Lago, TX were introduced to LandMapper - hand-held geophysical device - to assist them in undestanding soil properties and how they change during compaction. The project was undertaken in May 2012 to renovate high-traffic area near gym and playground of the elementary school. Kids learned how to make field observations and select areas with contrasting soil properties. They also learned that collecting soil samples by traditional methods is hard and "dirty" work. However, LandMapper can measure soil electrical resistivity (ER), a reciprocal of electrical conductivity (EC) - ER=1/EC - quickly and directly on the soil surface. Those electrical properties are related to many soil properties which reflect soil "health": compaction, stone content, salinity, fertility, texture, organic matter, and others. Using LandMapper to measure soil ER or EC prior to soil sampling can considerebly reduce time and effort in soil mapping and analysis. Best of all, LandMapper can be used anywhere - in farm fields, construction areas, flooded or frozen soils; and by anyone - very little training is required!
Местоположение
Электрофизика почв и не только - лекция
leva пн, 10/15/2012 - 21:13Лопата иногда представляется неотъемлемым атрибутом практикующего почвоведа. Однако почвовед может выглядеть и по-другому.
В этом случае его инструментом становится электронный прибор и моток проводов. В своей лекции я постараюсь рассказать, какие возможности открывают перед почвоведом электрофизические методы, где-то дополняя уже ставшие классическими способы обследования почв, а где-то являющиеся и единственным методом, которым можно решить поставленные задачи.
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Online Manuals and Textbooks on Electrical Geophysics
landviser пт, 10/05/2012 - 21:07- Войдите или зарегистрируйтесь, чтобы получить возможность отправлять комментарии
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Cenozoic Shale Formations as a New Frontier Area - detecting shallow natural gas fields
anisimov вт, 08/21/2012 - 15:19Guest post by Dr. Leonid Anisimov, Principal Scientist of Lukoil-Engineering, Volgograd, Russia. VolgogradNIPImorneft – scientific center of the LUKOIL Oil Company for the South Volga, Caspian Region and Middle East.
Shalow gas accumulations in shale deposits are unconventional energy resources. However those are hazardous objects for drilling especially in the offshore areas.
Seismic is a principal instrument to detect shallow gas pockets but electromagnetic methods may have advantage. The presentation below shows principal geography and techniques for detection and development of shale gas fields. A pilot project of Landviser LLC in using VES for monitoring accumulation and release of methan in peat bogs of Eastern Siberia is attached.
Locations
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Vertical Electrical Sounding and Self-Potential Methods to Survey for Placement of Potable Water Wells
landviser вт, 04/03/2012 - 16:15Water is a precious commodity in most urban and rural areas. Luck of local potable water sources threatens not only thriving but a mere survival of rural communities all over the world. Establishing potable water wells requires a lot of fundings and resources and often cost prohibitive for local governments in South America and Africa.
Searching for shallow groundwater require knowledge of subsurface layers and locating intensity and directions of water fluxes, which can be accomplished with geophysical methods of vertical electrical sounding (VES) and self-potential (SP). A method of VES can distinguish differences in electrical resistivity or conductivity at the multiple (10+) layers in soil profiles. These differences reveal the changes in soil texture and structure between water-bearing and waterproof layers, which form a framework for the subsurface water fluxes.
The directions and intensities of the fluxes can then be evaluated with the self-potential method. However, conventional equipment for VES and SP is very expensive, bulky and complicated to operate. We tested a simple low-cost handheld device, LandMapper ERM-02, to evaluate layers in the ground with VES method and results were well correlated with drilled profiles in Central TX. Information is provided for the VES array assembly, field measuring procedure and interpretation of sounding results. Previously, device was used in Astrakhan area, Russia for estimation of the groundwater table and salinity layers in the soil profiles. The method of self-potential was used to estimate subsurface water flux directions and intensities through the measured variation in electrical potential on the soil surface and direct potable wells placement in Kiev, Urkaine and Dmitrov, Russia.

Locations
RES3DINV - 3D inversion geophysical software for resistivity and induced polarization data
RES3DINV software -Create 3D models of subsurface resistivity or IP!
For Windows XP/Vista/7 (available for 32- and 64-bit PCs.)
3D surveys for pole-pole, pole-dipole, dipole-dipole, rectangular, trapezoid, Wenner, Wenner-Schlumberger,and non-conventional arrays.
Now available as a combined package together with RES2DINV, the 2D Resistivity & IP inversion program.
Supports exact and approximate least-squares optimisation methods
Supports smooth and sharp constrasts inversions
Supports up to 5041 electrodes and 67500 data points on computers with 1GB RAM
Supports trapezoidal survey grids
Supports parallel calculations on Pentium 4 (and compatible) based computers
Multi-core support with RES3DINVx32, 128GB memory support with RES3DINVx64
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