Cloud and tree canopy thickness detection from low resolution Lidars

Metadata Updated: February 28, 2019

The IM-CW system is currently designed for CO2 integrated path differential absorption (IPDA) measurements. Backscattered science signals of the online and offline wavelengths from the surface as well as aerosols and clouds are simultaneously collected with a telescope, optically filtered with a narrow band optical filter, and detected by a single detector. Both the science and reference signals are amplified, electronically filtered and then digitized for retrievals of column CO2 using IPDA approach.[HTML_REMOVED] Post processing of the digitized science and reference data allows for discrimination between ground and intermediate scatterers using the matched filter technique. Our technique takes a repeating signal such as a repeating CW sweep or pulse train, interpolates it using our unique frequency domain reordering technique. This interpolation technique takes a repeating waveform and converts it into a single waveform interpolated by the number of repeats in the sample. This is then enhanced further with our unique variation on the Richardson Lucy deconvolution technique and using a point spread function derived through measurement. By iterating the RL deconvolution by a specific amount, we have been able to enhance the resolution as much as 2 orders of magnitude, making it possible to use a low-resolution lidar to measure tree canopy height or discriminate between thin clouds. This has been demonstrated both in ground testing and flight tests. The results were published in Optics Letters in two separate journal articles. These results were also presented at both the American Geophysical Union and the European Geophysical Union.

Access & Use Information

Public: This dataset is intended for public access and use. License: U.S. Government Work

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Dates

Metadata Created Date August 1, 2018
Metadata Updated Date February 28, 2019

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date August 1, 2018
Metadata Updated Date February 28, 2019
Publisher Space Technology Mission Directorate
Unique Identifier TECHPORT_34962
Maintainer
TECHPORT SUPPORT
Maintainer Email
Public Access Level public
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://data.nasa.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id 41585a84-6713-4e7d-b6f9-32af9721d5d4
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2015-10-01
Homepage URL https://techport.nasa.gov/view/34962
License http://www.usa.gov/publicdomain/label/1.0/
Data Last Modified 2018-07-19
Program Code 026:027
Source Datajson Identifier True
Source Hash f79b4436ae8b2ca6e80a02a59037fb83ae75ce58
Source Schema Version 1.1

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