Comments on: Multispectral vs Hyperspectral Imagery Explained

By: Sameer Anwar

Sameer Anwar — Sat, 02 Dec 2023 23:45:25 +0000

What sensor do I need for plant disease and pest detection? And can you give me a hint on how the process can be done?

By: GISGeography

GISGeography — Fri, 20 May 2022 10:31:17 +0000

In reply to Sujata. You're probably looking for the near-infrared band and use NDVI (Normalized Difference Vegetation Index). So something free would be Landsat (30 meters) or Sentinel-2 (10 meters) Here are some of the Landsat 8 band combinations as well here is an explainer on NDVI.

By: Sujata

Sujata — Thu, 19 May 2022 17:59:14 +0000

Which satellite and what will be the combination of bandwidth to be used to work with forest tree canopy and what are the other things that we should focus on if we want to work with satellite images.

By: Sampson Kwame Asiedu

Sampson Kwame Asiedu — Sun, 16 May 2021 15:31:16 +0000

Very educative and helpful resource

By: Edson Carlos O Mota

Edson Carlos O Mota — Tue, 05 May 2020 03:27:44 +0000

Gentlemen, my name is Edson CO Mota, I am a technician in telecommunications and I speak from São Paulo, Brazil and I would like to ask you who have the technology that is possible in this time of pandemic to carry out the spectral scan of the pathogen “sar cov 2” and make “open source” data available to hyperspectral camera companies to import this data to detect covid in the atmosphere, environment; this would be a much more effective way than biochemical tests and would bring us to another level in facing the pandemic, please think about it. Thank you ….

By: Ashtad Engineer

Ashtad Engineer — Wed, 13 Mar 2019 17:49:36 +0000

Very insightful topic. We are in the infrastructure building infrastructure like airports, roads, Energy, Ports, solar farms, wind farms, mining operations, logistics etc. A very whacky idea about having a spectral signature for each of the assets from a security standpoint. Today the hyperspectral sensors record the reflected radiation from the objects. Each of these objects has a different way to absorb the EMI and reflect which leads to spectral signatures or fingerprints for that object. If I take this principle and start tagging my physical assets with some coating or a way to identify my assets thru this, I could then monitor it from a security perspective. We have mesh satellite companies which have these mini-satellites which have Multispectral and Hyperspectral cameras and use imagery and then translate that into Data Analytics and all sort of things. I was wondering if this is at all possible to have your assets tagged in a way where we could identify immediately with the spectral signature/fingerprint which is unique to our company.

By: Daniel Maple

Daniel Maple — Sat, 23 Jun 2018 04:39:54 +0000

I am a Consulting Arborist and am interested in using multispectral imagery to assess trees. I would like to be able to determine species, health, condition, and specific diseases/pests.

Can this be done with multi camera such as micasense red-edge or would I need a hyper camera? Also more important is the a service that can interpret the data and provide proscription?
If not, where can I find the software so I can build the data set I need?

By: GISGeography

GISGeography — Thu, 14 Jun 2018 01:00:13 +0000

In reply to Cliff.

Hi Cliff, this is a challenging question to answer. Yes, commercial satellites probably won’t be able to achieve the resolution you need. From my knowlege, Worldview-2/3/4 is still the sharpest imagery you can get and it’s a bit finer than 0.5 meter.

As for the question, how to measure methane, I apologize but this is a bit out of my area of specialization… What I would do is look at studies that have had success in doing this. For example, Measurement of Pollution in the Troposphere (MOPITT) onboard Terra satellite has had success measuring CH4. The methodology that NASA uses is described here –
https://asdc.larc.nasa.gov/documents/mopitt/guide/ASDC_MOPITT_Overview_2015.pdf

Hopefully, someone else here can assist you for measuring methane and nitrogen through remote sensing.

By: Cliff

Cliff — Tue, 12 Jun 2018 12:13:56 +0000

Is there hyperspectral imagery available that could be used to discern various gases ebulating in a water body (e.g., river or embayment)? The gases are released when bubbles come to the surface – we’d need cm-level imagery to see the bubbles (not available commercially, to my knowledge), but what about non-visible bandwidths to “see” the gases that are released – nitrogen versus methane?

By: MR.E

MR.E — Wed, 16 May 2018 01:04:46 +0000

Saleh, satellite-based radar (SAR) has ~1m penetration under ideal conditions (dry sand) and 0m under poor conditions (wet clay). Alternatively, ground penetrating radar (GPR) extends that to 10’s of metres (but similarly requires (the same) good conditions).