Questions tagged [measurements]

Questions related to acquiring, processing and interpreting field measurements of any kind. Including instrumentation and data analysis.

Filter by
Sorted by
Tagged with
7
votes
1answer
381 views

What are the advantages in looking at an OLR map versus looking at IR satellite imagery?

Conceptually they seem to be showing the same information. But in the context of a Madden Julien Oscillation (MJO) or equatorial waves especially over the equatorial oceanic layers which one is more ...
5
votes
1answer
636 views

How to determine that sustained wind speed exceeded the threshold value?

Certain maritime ports and airports have ranges of operation relation to the wind, usually according to a given threshold value of sustained wind speed. If I have the instantaneous values from ...
3
votes
0answers
765 views

Determine Latitude and Longitude without a GPS [closed]

Is it possible to measure the strength of a rare earth magnet to determine latitude and longitude of a current position? For instance say you start with your known latitude and longitude and then use ...
11
votes
1answer
254 views

Turbidity/clarity vs optical depth

Are measurements for clarity (secchi disk) or turbidity (nephelometer) made for water quality related in any way to measurements made for optical or aerosol optical depth in meteorology?
11
votes
2answers
3k views

Standardized scale for coastline length or mapping in general?

Measuring the length of a coastline depends on the scale of the measuring tool. The smaller the scale of your tool, the longer will your measured coastline be. The reason for this is the fractal ...
14
votes
2answers
1k views

How can odor travel be tracked

Odd question, but what data would be needed to to calculate how far winds will carry a strong odor (such as the smells of a restaurant, pizza parlor or burning wood/building? There is wind direction ...
13
votes
1answer
2k views

How do you calculate the depth of penetration in a Schlumberger array?

In a resistivity survey, how do we calculate the depth of penetration for a Schlumberger array?
8
votes
1answer
88 views

Are there measurement techniques that can help determine the exact geometry of a volcanic vent?

In a previous question What happens to the higher frequency content of the tremors associated with a volcanic eruption?, I asked about the high(er) frequency content of a volcanic eruption. In the ...
12
votes
2answers
3k views

What exactly is wind velocity

How exactly do we define wind velocity? Obviously, I suppose this is something like "speed of displacement of a quantity of air", but this seems to be too imprecise. For example, a cup anemometer ...
11
votes
1answer
269 views

What happens to the higher frequency content of the tremors associated with a volcanic eruption?

From [1]: The main characteristics of volcanic tremor depend strongly on whether a volcano is erupting explosively and on the intensity of the event. Long before an eruption, tremor is ‘narrow-band’ (...
13
votes
1answer
666 views

Where can I obtain ocean wave data of the Southeast Asian region?

I am interested in obtaining ocean wave data (preferably from actual measurements), such as wave height, period, and direction, in the Southeast Asian region. Where can I obtain them?
17
votes
3answers
10k views

If 75% of radioactive material remains, how many half-lives have elapsed?

Radioactive element A radioactively decays into material B. If 75% of A and 25% of ...
6
votes
1answer
89 views

What, if any, scientific value do global soundscapes have?

Seems like the Earth Day related crowd sourcing project to create the first global soundscape by encouraging smartphone owners around the world to download and use an app developed to record the ...
10
votes
1answer
253 views

How to determine the transmissivity of a system of rocks and faults from the stationary drawdown pattern?

I have a dataset containing high frequency measurements of the hydraulic head at different locations in a 5x6km area. Also known are the precipitation, evaporation, and pumped discharges from a number ...
9
votes
1answer
59 views

Lab procedure for analyzing/assessing the presence of semi-volatile solids

I'm looking for a lab experiment design that shows how to measure the presence of semi-volatile solids in water (and not sludge or soil or solids). All I have found so far are chromotography/mass ...
8
votes
2answers
130 views

Measurement of groundwater levels

There are numerous measurement systems available for measuring groundwater levels (head / stage). What period of time should measurements be collected in order to draw solid conclusions about the ...
8
votes
2answers
367 views

Is seismology really the only way to measure the thickness of Earth's layers?

Answers from these two questions: How can we guess the size of the earths inner core? & How can we measure the thickness of the earths mantle? use seismic waves as the method for detirmining ...
4
votes
2answers
9k views

How can we measure the thickness of the Earth's mantle? [duplicate]

According to Wikipedia the earth's mantle is approximately 2900 km (1,800 miles) thick. How is it possible to achieve such measurements? Obviously we haven't sent anything down that far to check.
14
votes
1answer
184 views

What kinds of remote sensing required to observe methanogenic life on Titan?

Inspired by Chris McKay's Possibilities for methanogenic life in liquid methane on the surface of Titan. In the paper, the PI's found that the consumed acetylene, ethane, and other organic solids ...
22
votes
1answer
314 views

Estimating the permeability tensor of an oil field by remote sensing

I work a lot with numerical methods to solve multiphase flow in porous media for oil applications. In our field, we often use Darcy's law which states that the flux is negatively proportional to the ...
11
votes
1answer
169 views

How do we determine subsurface composition?

Let's assume that a seismogram $s(t)$ is the convolution $s(t)=r(t)g(t)$ between a source signal $r(t)$ and propagation effects $g(t)$. If the source signal $r(t)$ is known, then we can obtain the ...
14
votes
2answers
363 views

How are subsurface wave speeds determined without subsurface sensors?

This is something I've never quite understood from a geology class I took years ago: Consider the following picture (courtesy of wikipedia) Obviously, we can't possibly have sensors deep in the ...
8
votes
1answer
117 views

Checking the bedrock with radiowaves - how does it work?

I've heard long ago that the rock material deeply below surface are checked by a device that acts like radar - it sends radiowaves into the ground, and geologists find out from reflections that what ...
9
votes
3answers
1k views

How deep could the surface of the Earth's crust get?

In theory, how deep can a natural formation on the surface of the Earth's crust be? What are the limits to this depth?
18
votes
1answer
651 views

Why are weather kites no longer used (much) operationally?

Figure 1.12 from the IPCC AR5 WG1 report (reproduced below) illustrates the different instruments that have been used for weather forecasting. Most of the methods have been in continuous use since ...
10
votes
1answer
117 views

What methods exist for remote profiling of oceanic columns?

Remote sounding of the atmosphere is a well-established method used extensively used extensively for operational weather forecasting and scientific research. Active or passive instruments carried on ...
14
votes
1answer
152 views

Have there been any attempts to measure profiles through deep convective systems using dropsondes?

In-situ measurements in deep convective systems, tropical cyclones, etc., are difficult to perform. Few if any people would like to fly a small aircraft close to its core, and radiosondes or larger ...

1 2
3