SpatialFiltering Signal Processing

I checked the webpages intelligence-airbusds.com and sentinel-hub.com so far; both seem to be promising, but I was not able to get down to details and high-resolution samples.

Editing to add: Seems I'm behind the times. A (non-gis.stackexchange) colleague has told me that sub-metre imaging with reasonable pricing is available at LandInfo, possibly others. Uses sources such as Worldview, Ikonos, Pleiades satellites, for a minimum ROI purchase size of 25 sq km. Still won't be cheap, especially if you want frequent revisits/updates, but a lot better than when I looked and failed to find for my ROI a few years ago!

Spatial filterexample

As the particle passes through the beam, a secondary "pulse" signal is generated by a single optical fiber. Knowing the time t of the pulse signal, and the velocity v of the moving particle, the chord length x of the particle can be calculated.

The Parsum probe works on a patented fiber optic particle counting principle. It simultaneously measures particle size and velocity of individual particles.

Spatial filterFME

As an example, this link will lead you to choose what is available around the locality of Okrouhlice, chosen semi-at-random.

Your best single source for what you describe is probably Sentinel 2 L2A images, which you can every 5 days and offer visible + one IR band at 10m resolution, and multiple other bands at 20m and 60m.

Spatial Filterthorlabs

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Spatialfiltering in digital image processing PDF

I will add another possibility how to easily visualize some data from different satellite missions. Firstly, it will be Google Earth Engine. It is quite easy if you know a little bit JavaScript. If you would like to download data for area of the Czech Republic, there is a great possibility to use Collaborative Ground Segment. Probably every member of ESA will have such a Segment which is not limited by a number of downloaded files. Finally, there is a website called DIAS (Data and Information Access Services), which provides five cloud-based platforms providing accessing data and probably some advanced analysis. However, I've never used it and it's quite a chaotic solution for me (one platform would be enough)

If you are willing to pay it might be worth looking into Planet labs. They offer daily global coverage with a resolution between 5, 3 and 0.75 m. However you will at most get RGB+NIR and sometimes Red Edge.

If you are willing to pay, one convenient service is indeed sentinel-hub. You can sample and see rendered on-screen for free here, and as a paid service you can download conveniently or import into QGIS and other places.

The instrument is able to determine particle count and size distributions based on statistics coupled with the Spatial Filter Velocimetry technique. The Spatial Filter Velocimetry technique is widely established and has been used to measure the velocity of objects for over three decades.

Newportspatial filter

You can visualize data for free with signup at Copernicus. The data comes as large files which you can unpack or visualize directly with QGIS, etc., but which take a long time to download and will be far larger than your area of interest.

Using Spatial Filter Velocimetry, size and velocity can be extracted from particles as they pass through a laser beam and cast shadows on to a linear array of optical fibers.

Spatial filterimage processing

You can also look into other datasources there like Landsat and Modis, which each have their uses. I'm highlighting Sentinel-2 due to its frequency and high resolution on the 4 usually most crucial bands as a starting point.

The actual particle size depends on the shape and the trajectory of the particle as it passes the laser. The measured value represents a chord length. By accumulating results from individual particles (typically 3000-10,000 particles over a period of 30-120 seconds), the chord length and velocity distributions are calculated. Parameters derived from the chord length distribution eg X(10), X(50) and X(90), can be correlated against other particle size analyzer results.

I'm new to GIS, so please be patient if my question is a bit naive. I would like to regularly monitor an area in the Czech Republic in multispectral image depth, with update at least once in a few days. I am willing to pay for it.

Could you give me some hints where to start, how to see examples and evaluate the quality, before subscribing and paying?

A burst signal is generated due to the particle crossing fiber bundles labeled "burst a" and "burst b". The frequency of this signal is measured by photodetectors and is proportional to the particle velocity v. Knowing the spatial filter constant g, the velocity v can be calculated.