Production | MODAPS Services

MODAPS PCR 23-006

PCR Number	23-006
Date	2023-09-01
Initiator	Zhuo (Julie) Wang and Sudipta Sarkar on behalf of P.I. Robert Levy
Abstract	PGE104 1.0.5-0 Initial version of the science processing algorithm to make the MEaSUREs GEO-LEO DT Aerosol product was developed by DT Aerosol science team. Loader module (LM) and production rule updates and additions were made by MODAPS STIG to complete the transition of this process to a MODAPS PGE. Comparing with C61 MODIS DT product, Specific Algorithm Change/Improvements for this DT Package: A new release of Collection 1 version of PGE104, v1.0.0. Uses all L1b data, geolocation, angles, terrain height, Land Sea mask interpolated or congridded to 1km resolution. Final output retrieval is for 10 KM resolution, so 10*10 pixels are used for averaging overboard. Ocean Cloud Masking uses 3x3 spatial variability test at 0.66 �m (500m). Land Cloud Masking and NDVI Water Masking: Cirrus cloud testing is at 1.37 (1km) �m band, and NDVI water masking is done at 1km. All masks are done for whole granule so there is continuity. Change the data type of the bounding coordinates from string to float. .
Problem Statement	This is the first version of operational MODIS Dark Target (DT) MEaSUREs Aerosol Products for MEASURES project. It introduces a new PGE for generating Collection1 GEO DT Aerosol products, which are 10-minute L2 Full Disk products. The C1 GEO products include XAERDT_L2_ABI_G16 and XAERDT_L2_ABI_G17.
Description of Change	Initial version of the science processing algorithm to make the MEaSUREs GEO-LEO DT Aerosol product was developed by DT Aerosol science team. Loader module (LM) and production rule updates and additions were made by MODAPS STIG to complete the transition of this process to a MODAPS PGE. Comparing with C61 MODIS DT product, Specific Algorithm Change/Improvements for this DT Package: A new release of Collection 1 version of PGE104, v1.0.0. Uses all L1b data, geolocation, angles, terrain height, Land Sea mask interpolated or congridded to 1km resolution. Final output retrieval is for 10 KM resolution, so 10*10 pixels are used for averaging overboard. Ocean Cloud Masking uses 3x3 spatial variability test at 0.66 �m (500m). Land Cloud Masking and NDVI Water Masking: Cirrus cloud testing is at 1.37 (1km) �m band, and NDVI water masking is done at 1km. All masks are done for whole granule so there is continuity. Change the data type of the bounding coordinates from string to float. .
Products Affected	C1 L2 GEO products, XAERDT_L2_ABI_G16 and XAERDT_L2_ABI_G17
Software Affected	PGE104 1.0.5-0
Processing String to Receive the Change	ABI-G16 Forward Processing. ABI-G16 Reprocessing. ABI-G17 Forward Processing. ABI-G17 Reprocessing.
Downstream Product Effects	None
Data Granules to be Used for Science Testing	A series of science tests have been carried out to assess and fully confirm all production rule and science changes in AS1955. The outputs from this test were fully assessed and approved by LDOPE and the science team.
Justification	The new C1 MEaSUREs GEO-LEO products carry critical science information and provide datasets that were requested by the user community.
Effective Date for Implementation of Change	MODAPS was requested to start the reprocessing of the C1 GEO-LEO products, with all the changes mentioned herein, as of 09/01/2023. The products, whatever have been generated this far, have been reviewed by LDOPE and science team and approved for release from the DAACs.
Status	Major algorithm development completed. Robert Levy approved 09/01/2023. Sadashiva Devadiga approved on 09/21/2023. Sudipta Sarkar approved on 09/01/2023.