Landviser’s on-line store is being re-created

Landviser, LLC is a small geo-consulting family owned company with offices in Houston, TX and Moscow, Russia. We develop and sell Electrical Geophysical Devices & Geophysical Imaging Software and also provide Consulting & Training Services in Geophysics, GIS, and Basic Soil Science. Our exclusive hand-held LandMapper devices are geared toward near-surface geophysical explorations (<25 m depth), and most suitable for archaeological, forensic, engineering, agricultural, ecological and hydrological applications. Current model, ERM-02 - electrical conductivity (EC), resistivity (ER), self-potential (SP) - is highly portable, accurate and very competitively priced (<2,500$US). Basic model, ERM-01 - electrical resistivity only - (<1,600$US) is also available. We have expertise in other electrical geophysical equipment, used for deeper geophysical prospecting, such as AGI and ABEM systems.
Our on-line store is being re-created. Meanwhile, you can still place orders for LandMappers ERM-01/ ERM-02 and accessories, GIS consulting, or geophysical software RES2DINV / RES3DINV. Download our Catalog or contact us for personal quote. We ship worldwide and accept PayPal, VISA/MC and wire-transfers to our US bank account.

More information about our products and services: Main web: www.landviser.com Store: www.landviser.biz Toll-free (USA/Canada): 888-306-LAND (5263) Phone (International): +1-609-412-0555 Blog: http://landviser.blogspot.com LinkedIn: http://www.linkedin.com/in/larisagolovko Fax: +1-815-301-8955

Landviser develops innovative non-invasive technologies (hand-held equipment and software) for mapping and monitoring core biosphere components: soils, plants and groundwater. We provide custom research system integration and consulting on electrical geophysics applications in agricultural and environmental sciences; GIS; geostatistics; and remote sensing. Depending on your project we can assist with equipment/software procurement and develop training courses in geophysical equipment (ERM-02 and ABEM) and software (GIS, seismic and resistivity imaging). We are an international consulting company with headquarters in Texas, USA and business contacts in Canada, Russia, Malaysia, Philippines, Middle East, China and South America. Please, do not hesitate to contact me, Larisa Golovko (Pozdnyakova) - info@landviser.com

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LandMapper ERM-01 is a hand-held resistivity meter which accepts Wenner (as well as any other four-electrode arrays, dipole-dipole or square ones f.e.). It can sense down to 15 meters in most soils. You can use hyperlinks to download our publications about LandMapper and popular geophysical freeware/shareware. 
LandMapper ERM-02 measures electrical resistivity (ER), electrical conductivity (EC) and natural electrical potential (EP) from soil surface down to 25 m depth as well as in soil pits, pots, samples, pastes and water solutions. Don't let the small size fool you - LandMapper ERM-02 measures electrical parameters in a widest range possible (from ultra-pure water and rocks to ocean waters) with the accuracy comparable to the standard devices used in electrical geophysical prospecting, like ABEM, Syscal, etc,  but weights and costs TEN times less!
The applications of LandMapper are not limited to soils but can be extended to any semisolid media and even live plants! Download new LandMapper ERM-02 brochure or complete manual.
We now have limited quantities of both models in stock - basic ERM-01 with resistivity mode only for $1,579 (sug. retail) and ERM-02 (resistivity, conductivity, and self-potential) for  $2,437 (sug. retail).  Probes and arrays can be easily constructed from common hardware, but we can build probes to your specs for very reasonable price and can provide other accessories.
Note, that we also offer dealers' and academia discounts on equipment and software!

Our popular LandMapper devices are back in stock!

LandMapper ERM-01 is a hand-held resistivity meter that can accept Wenner (as well as any other four-electrode configuration, dipole-dipole or square ones f.e.). It can sense down to 15 meters in most soils. You can use hyperlinks to download our publications about LandMapper and popular geophysical freeware/shareware.

LandMapper ERM-02 measures electrical resistivity (ER), electrical conductivity (EC) and natural electrical potential (EP) from soil surface down to 25 m depth as well as in soil pits, pots, samples, pastes and water solutions. Don't let the small size fool you - LandMapper ERM-02 measures electrical parameters in a widest range possible (from ultra-pure water and rocks to ocean waters) with the accuracy comparable to the standard devices used in electrical geophysical prospecting, like ABEM, Syscal, etc,  but weights and costs TEN times less!

The applications of LandMapper are not limited to soils but can be extended to any semisolid media and even live plants! Download new LandMapper ERM-02 brochure or complete manual.

We now have limited quantities of both models in stock - basic ERM-01 with resistivity mode only for $1,579 (sug. retail) and ERM-02 (resistivity, conductivity, and self-potential) for  $2,437 (sug. retail).  Probes and arrays can be easily constructed from common hardware, but we can build probes to your specs for very reasonable price and can provide other accessories.  Note, that we also offer dealers' and academia discounts!

We ship worldwide and accept PayPal, VISA/MC and wire-transfers to our US bank account. Customers from USA may also pay with Purchase Order. Landviser, LLC is US government vendor and service provider and is registered in CCR.

Please, inquire early to insure device availability for your intended research project! Do not hesitate to contact me to discuss suitability of our equipment for YOUR applications. We at Landviser, LLC are always "enlightening research" for you!

Best,

Larisa Golovko (Pozdnyakova), Ph.D. (thesis "Electrical properties of soils")

LandMapper ERM-02: Handheld Meter for Near-Surface Electrical Geophysical Surveys

was just published in
Golovko L, Pozdnyakov A, Pozdnyakova A (2010) LandMapper ERM-02: Handheld Meter for Near-Surface Electrical Geophysical Surveys. FastTIMES (EEGS) 15: 85-93. http://www.eegs.org/Publications/FASTTIMES.aspx  Accessed 6 June 2011
Abstract     On-the-go sensors, designed to measure soil electrical resistivity (ER) or electrical conductivity (EC) are vital for faster non-destructive soil mapping in precision agriculture, civil and environmental engineering, archaeology and other near-surface applications. Compared with electromagnetic methods and ground penetrating radar, methods of EC/ER measured with direct current and a four-electrode probe have fewer limitations and were successfully applied on clayish and saline soils as well as on highly resistive sandy soils, such as Alfisols and Spodosols. However, commercially available contact devices, which utilize a four-electrode principle, are bulky, very expensive, and can be used only on fallow fields. Multi-electrode ER-imaging systems applied in deep geophysical explorations are heavy, cumbersome and their use is usually cost-prohibited in many near-surface applications, such as forestry, archaeology, environmental site assessment and cleanup, and in agricultural surveys on farms growing perennial horticultural crops, vegetables, or turf-grass. In such applications there is a need for an accurate, portable, low-cost device to quickly check resistivity of the ground on-a-spot, especially on the sites non-accessible to heavy machinery.
      Here are direct links to full issue of FastTIMES on EEGS website
      low resolution http://www.eegs.org/Portals/2/FastTimeFiles/ft1504_Dec2010_low_r02.pdf
      high resolution http://www.eegs.org/Portals/2/FastTimeFiles/ft1504_Dec2010_high_r02.pdf
          Permanent link to just LandMapper article on Landviser's website http://landviser.net/webfm_send/69
Also look for this and other relevant references in our free-access public library “Soil Electrical Geophysics” http://www.landviser.net/content/soil-electrical-geophysics-public-library-zotero

Applications of LandMapper handheld for near-surface soil surveys and beyond

On-the-go sensors, designed to measure soil electrical resistivity (ER) or electrical conductivity (EC) are vital for faster non-destructive soil mapping in precision agriculture, civil and environmental engineering, archaeology and other near-surface applications. Compared with electromagnetic methods and ground penetrating radar, methods of EC/ER measured with direct current and four-electrode probe have fewer limitations and were successfully applied on clayish and saline soils as well as on highly resistive stony and sandy soils. However, commercially available contact devices, which utilize a four-electrode principle, are bulky, very expensive, and can be used only on fallow fields. Multi-electrode ER-imaging systems applied in deep geophysical explorations are heavy, cumbersome and their use is usually cost-prohibited in many near-surface applications, such as forestry, archaeology, environmental site assessment and cleanup, and in agricultural surveys on farms growing perennial horticultural crops, vegetables, or turf-grass. In such applications there is a need for accurate, portable, low-cost device to quickly check resistivity of the ground on-a-spot, especially on the sites non-accessible with heavy machinery.

Four-electrode principle of EC/ER measurements

Our equipment utilizes well-known four-electrode principle to measure electrical resistivity or conductivity, as shown in the figure. LandMapper^® measures potential difference ( Dj) which arises between two electrodes (M and N), when electrical current (I) is applied to other two electrodes (A and B). The increase of the distance among four electrodes in a set allows measuring resistivity of deeper layers, f.e. probe of A2M2N2B2 reaches deeper than A1M1N1B1. In theory, electrical resistivity (ER) of a material is defined as follows:
where L is the length of a uniform conductor with a cross-sectional area A. A/L is a geometrical coefficient (K), which is easily calculated for different in-situ electrode arrangements and laboratory conductivity cells. LandMapper^® calculates electrical resistivity using formula: . The direct digital output of the device is electrical resistivity in Ohm m. Those can be converted automatically in electrical conductivity (S/m) inside LandMapper^® ERM-02 by using reciprocal of the measured resistivity: . Thus, the measured results may as well be presented in convenient for soil scientists form of soil electrical conductivity (EC), which is routinely used to evaluate salinity of soils and irrigation water. However, EC can be used in many more applications than just soil salinity! Also ERM-02 can output natural electrical potential (EP) of soil and plants, which has some specific applications .

Applications of EC/ER technology in soil studies

Mapping of soil properties highly influencing density of mobile electrical charges (measured EC/ER strongly correlates with those properties in-situ):
1. Soil salinity
2. Soil texture (i.e. silt, sand and clay contents, working formula needs to be developed)
3. Coarse fragment content and depth to bedrock
4. Depth to limiting layers like clay and plow pan (wastewater - leaching fields)
5. Groundwater depth - capillary rise extent in profile
6. Correlations between soil EC maps and yield maps for many crops were established
7. Depth and extent of permafrost.
8. Pollution detection - depth and limits (pollution during oil and gas mining, for example)
9. Location and stability of karsts and carbonate sink holes.
10. Mapping of soil disturbance and search for hidden objects (drainage pipes, urban underground communications, forensic and archaeological applications).
11. Estimating depth of peat deposits during prospecting and locating methane accumulations in natural bogs and swamps.

Monitoring processes where only one soil properties changes:

12. Soil water content changes
13. Monitoring fertilizer uptake and other solute transport in soils (f.e. during phytoremediation)
14. Monitoring of freezing-melting processes in soil
15. Mapping and monitoring leakage from the retention ponds and sewage ponds, and underground oil storage tanks.

 

Applications in soil genesis studies.

Many soils of humid areas developed under downward leaching and typically feature the elluvial horizon with very high resistivity.
16. The thickness of horizons, the degree of eluviations and soil profile organization can be evaluated either without digging soil pits or by quick checking EC on the walls of soil pits.
17. Measuring of soil vertical and horizontal anisotropy non-destructively.

Special applications beyond soil studies:

18. Forestry – in addition to evaluating all important soil properties of forest soils, monitoring ER of a growing tree can indicate wood quality and if plant is stressed (also electrical potential is especially useful in plant health studies as non-penetrating electrodes can be mounted on surface of herbaceous plants).
19. Evaluating and monitoring stability of the roads (seasonal, gr avel, asphalt, on permafrost or landslides, etc.).
20. Measuring integrity of underground electrical cables and pipes (and soil corrosive properties).
21. Monitoring charge-recharge processes in membrane resins in water purification plants or consumer distillers.
22. ….? Can you think of any other possible applications that can benefit if electrical conductivity/potential of a natural system could be measured quickly and non-destructively?
We at Landviser, LLC would like to hear from you! Post a comment, or email us at info@landviser.com.

Richard Feynman once said: “There is not a single phenomenon in Nature which is not driven by electricity to some extent. ” (quote paraphrased)

Richard Feynman (1918-88) had an enormous talent of explaining complicated scientific matters to non-scientists. Watch this short video where he admires wonders of electricity in the dentist’s waiting room – “Electricity is bigger than gravity!”

How-to use LandMapper and consumer-grade GPS data-logger to quickly map salinity on farm fields

Task on hand – estimate salinity level on fields planned for rice next year. Six fields with total area of 322 acres were selected by farmer. Equipment on hand: two LandMappers with different size probes attached (measuring electrical conductivity (EC) down to ~ 8” and 18”), Columbus GPS data-logger, all-road vehicle or “Mule”. Three people – farmer driving a '”mule” and recording data on paper, one person measuring with Landmapper at 18” depth, other person measuring EC with LandMapper to 8” depth and recording POI or way points with GPS.
Results: 30 points recorded in less than 1.5 hour (including about 45 min break to wait out the rain). EC in the field varied from 5 mS/m to 106 mS/m on surface; and from 19 mS/m to 400 mS/m in deeper layer.
Problems encountered – pouring rain, all electronics got wet, one LandMapper refused to store data (so it is always a good idea to write measurements on paper as a backup :), we did small repair of probe banana-plug contact with pocket knife.
To see what type of soils are on the farm and where we measured EC, download and install Google Earth from http://earth.google.com/ . Then go to Google Earth Interface
and download soilweb.kmz plugin. Save it to your harddrive. In Google Earth program go to File/Open and open attached .kml and KMZ files. You will see locations of our measurements, satellite imagery of the fields and outlines of soil map units. Clicking on yellow abbreviations bring quick reference about soil series name and profile. Clicking on soil name brings you a lot of detail information about soil properties, scientific soil name, typical native plant (with hyperlinks to plant database) and recommended soil usage.  This database is maintained by UC Davis.

Geotomo Software - Downloads and prices for 2011

Landviser offer the same pricing for geophysical interpretation and imaging software as Geotomo, Inc.
You can download the most current versions of software from here:
Geotomo Software - Downloads:
View current pricing for software current pricing for GeoTOMO software and Landviser's Equipment.
Landviser, LLC is authorized distributor of RES2DINV/RES3DINV software and preferred vendor for customers in North and South Americas (registered in CCR system), Africa, Russia, China. Please contact Landviser, LLC before contacting other dealers or Geotomo directly as we will meet or beat quotes by other dealers. We accept purchase orders from US customers as well as VISA/MC and wire transfers to our US bank account and ship worldwide.
To get official quote, contact Landviser, LLC at info@landviser.com or +1-609-412-0555.