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ERM-01

Unique compact geophysical devices

Landmapper hand-held resistivity meter compared with AE-72 (standard)Landviser's products include portative devices for measuring electrical properties (electrical resistivity, conductivity, and potential)  in soils, plants and other semisolid and liquid media. This equipment is small, fully computer-integrated, and easy to use. It is very competitively priced and come handy in many environmental and agricultural applications, including mapping of residential and commercial properties, construction sites, farms, and golf courses.

LandMapper ERM-01

LandMapper ERM-02

We can also help you with geophysical equipment and software distributed by our Partners. We develop and conduct online and in-person training classes for our clients and distributors. We sometimes offer used GPS units and geophysical equipment of other companies out of Landviser's inventory. Contact us for comprehensive help for your research and surveying needs.

Happy New Year 2015!

Landviser wishes  all our clients, colleagues and friends happy holidays, as well as healthy and prosperous New Year!

Желаем всем нашим друзьям и коллегам веселых праздников, а также счастья, здоровья и успехов в Новом Году!

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Landviser now offers complete line of electrical geophysical equipment and software: from our exclusive simple hand-held resistivity and self-potential meters, LandMappers, to the most sophisticated 16-channel, 64-electrode automatic RES/IP tomography set, SibER-64! Also:

GPS data loggers: cost-effective rugged data loggers, inclinometers, distance scanners and cameras from F4Devices

GIS & Geophysics consulting: on-site and remote classes and support available worldwide

Customized Solutions: No project is too big or too small!

Call: +1-609-412-0555 or 888-306-LAND

Email: info@landviser.net     Web: www.landviser.net

Landviser, LLC (USA) is authorized distributor for KB Electrometry (Russia), GeoTOMO Software (Australia/Malaysia) and F4Devices (USA)

2D Dipole-Dipole Electrical Tomography with LandMapper

Manual measuring of electrical resistivity 2D cross-section is possible with LandMapper with supplied (optional) or made by user cable set.

There are two modifications of 2D cable set offered and tested by Landviser, LLC:

  1. Mobile shallow (~2 m depth) set consisted of two T-style probes (AB and MN dipoles) similar to mapping probes. The dipoles are set at 1 m size with possible separation between dipoles (wire length) no more than 5 meters (n=5).
  2. Stationary set (~ 14 m depth) where electrodes are hammered on the soil surface along the straight line at one meter distance. Electrodes are simple metal spikes/nails and is sourced locally (are NOT provided by Landviser, LLC). We supply wires with banana-plug connections to LandMapper terminals on one end and alligator clips on the other end to connect with electrodes.

Principle of measurements with both sets is the same for both cable sets and is illustrated by figure below. You can also watch instructional videos on our YouTube Channel - LandviserLLC

Location

0° 34' 51.8304" N, 71° 51' 2.1096" W

Sign up for webinar "Application of Geophysical Methods to Agriculture: Methods Employed"

Dr. Larisa Golovko (President of Landviser, LLC) will be presenting "Geophysical Methods of Electrical Resistivity and Self-Potential in Agriculture" in first of 

 

 

Agricultural Geophysics Webinar Series: "Application of Geophysical Methods to Agriculture: Methods Employed"

A live webinar on the application of geophysics to agriculture will be offered on:

Tuesday, February 18, 2014, from 3pm - 4:30pm EST
(2:00 - 3:30 CST, 1:00 - 2:30 MST, 12:00 - 1:30 PST)

This first in a series of agricultural geophysics webinars will focus on the near-surface geophysical methods presently being used for agricultural purposes, which include resistivity, self-potential, electromagnetic induction, ground penetrating radar, dielectric sensors, VIS/NIR/MIR spectrometry, gamma ray spectrometry, mechanical soil compaction sensors, and ion selective potentiometry. Five presenters will provide a short overview of agricultural geophysical methods during the first 30 minutes of the webinar. The last hour of the webinar will be devoted to a panel discussion with the presenters, who will answer questions from the audience.

Location

28° 8' 11.7564" N, 90° 50' 5.8596" W

Happy New Year 2014 from Landviser LLC

Dear visitors, clients, collegues and friends!

Landviser LLC is wishing you Happy, Healthy and Prosperious 2014! Let all your ideas to develop into innovative products and services to create more Joy on our planet Earth and gain yet more understanding about our World. We continue to develop and test our equipment for different environmental applications in collaboration with leading research organizations worldwide. This year we would like to congratulate Department of Soil Physics and Reclamation in Moscow State University (M.V. Lomonosov), Faculty of Soil Science with 70th Anneversary:

 

 

Also, this year we added two innovative geophysical devices to our offerings in collaboration with OOO Electrometry and Gelion holding (Russia):

Electromagnetic multi-frequency profiler AEMP-14

Electrical tomography SibER-48 equipment

Do not hesitate to ask us about applications of geophysics in archaeology, agriculture, and environmental sciences. We are here to "Enlighten Your Research".

Locations

Landviser LLC League City, TX 29° 32' 17.2716" N, 95° 4' 28.9776" W
LandMapper in Antarctica 70° 13' 39.9468" S, 63° 59' 3.75" W

Technical Specifications of LandMapper ERM-01

 

  • ·         Range of measurements…...............…………………………………….………......................................ER= 0.1-1 106 Ohm m
  • ·         Automatically adjusts electrical resistivity range to provide best measurement accuracy.

Electrical Geophysical Methods in Agriculture

Larisa presented paper and conducted workshop on "Electrical Geophysical Methods in Agriculture" at 4th International Symposium on Intelligent Information Technology in Agriculture (ISIITA) in Beijing, China.

Setting K coefficient in LandMapper memory

LandMapper ERM-02

LandMapper ERM-02 is usually supplied with one four-electrode probe in Wenner configuration (optional) and the probe-specific coefficient K is preset in the device memory (K1). If you ordered or build multiple probes/cable arrays, you can change K1-K9 coefficients in the device. Note: K0=1 always and is not changeable by user!

  1. Press the power button to turn the device on. As the device is turned on the brief message "ASTRO-LANDVISER" is displayed on the screen of the device.
  2. Press and hold the FUNCTION key (►) and press the UP key (▲) to enter the coefficient changing mode.
  3. Scroll through K coefficients with the keys (▲) or (▼).  Change the value of the coefficient with the keys (◄) and (▲) or (▼). The digit to be changed is selected with the INPUT key (◄), the digit starts blinking and can be changed with the keys (▲) or (▼). The value of K0=01.00 is constant and cannot be changed by the user. If a measurement is taken using K0, the resulting output is resistance, not resistivity, and can be useful when the geometry of the array is constantly changing, as in 2D imaging or electrical tomography. In this case the resistance values can be multiplied by corresponding K coefficients according to the arrays used to obtain the resistivity. In conductivity mode, when measurements are taken with K0, the measured value is conductance, not conductivity, and the results can be converted to conductivity after measurements with appropriate geometrical coefficient.

Calibrate (calculate) K-coefficient for laboratory four-electrode cell

LandMapper with laboratory conductivity cellsLaboratory cells supplied by Landviser, LLC have been calibrated and the respective K-geometric coefficient is printed on the cell. The cells have to be filled to the top rim, in order for the coefficient to be accurate. Also, sometimes due to corrosion of conductive plates (electrodes) the coefficient of the cell might change slightly. Thus, you can verify K-coefficient of any cell, just follow instructions below.

For other tips, download Measuring Properties of Natural Systems with LandMapper ERM-02 (manual)

Location

USDA-ARS Washington D.C., MD 38° 53' 42.4032" N, 77° 2' 10.9176" W

Kids using LandMapper to measure soil properties

Our 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!

Location

BACES El Lago, TX 29° 34' 47.2656" N, 95° 2' 13.308" W
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