Choosing MCD19A2.006 tiles to cover a region

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kodiologist
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Choosing MCD19A2.006 tiles to cover a region

by kodiologist » Wed Dec 14, 2022 3:13 pm America/New_York

Say I want to figure out which tiles in the scheme used by MCD19A2 collection 6 (identified with names like "h10v04") are necessary to cover some region of interest (such as the contiguous United States). What's the recommended way to do that? An official shapefile for the tiles would be helpful.

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Re: Choosing MCD19A2.006 tiles to cover a region

by ASDC - ingridgs » Mon Dec 19, 2022 10:01 am America/New_York

Hello @kodiologist,

In order to better re-direct your question to the appropriate Subject Matter Expert, could you please let us know what project are you referring to?
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kodiologist
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Re: Choosing MCD19A2.006 tiles to cover a region

by kodiologist » Mon Dec 19, 2022 10:20 am America/New_York

I'm not sure what you're asking. If you're asking what research project I'm involved in, I'm a biostatistician at the Icahn School of Medicine at Mount Sinai, working on a non-NASA study of matching up satellite products like MCD19A2 with independent data sources. If you're asking about MCD19A2, it's an aerosol optical depth product described here: https://lpdaac.usgs.gov/products/mcd19a2v006/ .

This said, my question is really just about the tiling scheme of standard MODIS products and doesn't have much to do with aerosols. Perhaps the LP DAAC would have relevant subject-matter experts?

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Re: Choosing MCD19A2.006 tiles to cover a region

by LP DAAC - dgolon » Tue Dec 20, 2022 3:11 pm America/New_York

Hi @kodiologist The HV numbers correlate to the HV Grid. An example can be found here: https://lpdaac.usgs.gov/data/get-started-data/collection-overview/missions/modis-overview/#modis-tiling-systems I am not aware of a shapefile that currently exists of the HV grid but I have passed this idea on to our science team. Thanks!
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Re: Choosing MCD19A2.006 tiles to cover a region

by LP DAAC - dgolon » Tue Dec 20, 2022 3:19 pm America/New_York

Hi @kodiologist just following up with additional information. There is a KMZ file of the HV grid, which can be found here: https://modis.ornl.gov/files/modis_sin.kmz
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Re: Choosing MCD19A2.006 tiles to cover a region

by kodiologist » Wed Dec 21, 2022 9:19 am America/New_York

Thank you, I think that file will do nicely. It seems to define the geometry in 3D rather than 2D, which is probably a mistake, but I don't think that will be hard to work around.

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