process.HOCR: Processed in-water HyperOCR data

In belasi01/HyperocR: Hyperspectral OCR data processing

Processed in-water HyperOCR data

Description

This routine compute AOPs from in-water hyperspectral measurements performed using HyperOCR radiometers deployed at the water surface with an arm and (optionaly) with a tripod. Four set-ups have been implemented so far:

Arguments

filen	is the name of a L2 file in *.dat format procuded by Prosoft
Station	is the station ID
Lu0.Depth	is the approximate depth (in meters) of the Lu0 sensor (Default is NA assuming there is no Lu0 sensor)
Eu0.Depth	is the approximate depth (in meters) of the Eu0 sensor (Default is NA assuming there is no Eu0 sensor)
EdZ.Depth	is the depth (in meters) of the EdZ sensor (Default is NA assuming there is no EdZ sensor)
Delta.LuZ.Depth	is the distance between Lu0 and LuZ sensors (in meters) (Default is NA assuming there is no LuZ sensor)
Ag.file	is the full file name and path of the RData file containing CDOM absorption
Ap.file	is the full file name and path of the RData file containing particles absorption
Bbp.file	is the full file name and path of the RData file containing bbp

Details

1. Upwelling radiance near the air-water interface (i.e. Lu0) and downwelling irradiance at depth Z (EdZ). Tripod set up. 2. Upwelling radiance near the air-water interface (i.e. Lu0) and upwelling radiance at depth Z (LuZ). 3. Upwelling radiance near the air-water interface (i.e. Lu0) only 4. Upwelling irradiance near the air-water interface (i.e. Eu0) only

The HOCR set up needs at least on sensor looking down just beneath the air-water interface. It could be either a radiance sensor (Lu0) or an irradiance sensor (Eu0). If the set up uses a Lu0 sensor, you must provide the depth at which the sensor was submerged using the parameter Lu0.Depth. For example, if the Lu0 sensor was lowered at 10cm below the surface, Lu0.Depth = 0.1. If the set up uses a Eu0 sensor, then Eu0.Depth must be provided. NOTE: non-NA is therefore mandatory for Lu0.Depth or Eu0.Depth. This depth will be used to apply a correction to retrieve Lu0- or Eu0-. This correction needs an estimation of the diffuse attenuation coefficient for the upwelling radiance Lu or irradiance Eu (K_Lu or K_u). In the set up #1 ( Lu0 and EdZ sensors available), Kd is estimated using Ed0+ and EdZ sensors, and KLu=Kd (only true in opticaly deep water). In the set up #2 (Lu0 and LuZ), K_Lu is computed from the measurements

In the set up #3 and #4, K_Lu or K_u can only be approximated using the measured IOPs. No correction will be apply is IOPs are not provided.

If Lu0 is provided, then the code will compute Rrs=Lw/Ed. If Eu0 is provided, then the code will compute R=Eu/Ed.

IMPORTANT: The instrument self-shadow correction has not been implemented yet.

Value

a long list including raw and processed data.

Author(s)

Simon Bélanger

belasi01/HyperocR documentation built on June 11, 2024, 7:21 a.m.