10.2. Working with ABI Level 2 Cloud Product Files

This example walks through the creation of GOES ABI Level 2 GeoTIFF product image files and adding overlays.

10.2.1. The Basics of Geo2Grid ABI L2 GeoTIFF File Creation

Find the options available when creating GOES-16, -17 and -18 ABI Level 2 GeoTIFFs:

geo2grid.sh -r abi_l2_nc -w geotiff -h

List the products that can be created from your ABI dataset:

geo2grid.sh -r abi_l2_nc -w geotiff --list-products -f <path_to_files>

Geo2Grid now supports two different ABI Cloud Products, cloud top height (HT) and cloud top temperature (TEMP). The height files use product names ACHA while the temp files using ACHT. For instance

CG_ABI-L2-ACHAC-M6_G17_s20223271831172_e20223271833556_c20223271834370.nc

CG_ABI-L2-ACHTC-M6_G17_s20223271831172_e20223271833556_c20223271834370.nc

You can provide Geo2Grid with both files for the same date/time and it will provide you the option to create both products with one execution.

To create GeoTIFF output files of both products found in this data set,

geo2grid.sh -r abi_l2_nc -w geotiff --num-workers 8 -f <path_to_files>

By default the products are color enhanced using the colormap:

$GEO2GRID_HOME/colormaps/abi_l2_modified_cloud_top.cmap.

Create just a Cloud Top Height Geotiff image:

geo2grid.sh -r abi_l2_nc -w geotiff -p HT -f <path_to_abi_files>

Create a Cloud Top Temperature image from the GOES-17 CONUS domain product created from 23 November 2022, 18:31 UTC ABI observations.

geo2grid.sh -r abi_l2_nc -w geotiff -p TEMP -f CG_ABI-L2-ACHTC-M6_G17_s20223271831172_e20223271833556_c20223271834370.nc

The resulting image is displayed below.

../_images/GOES-17_ABI_TEMP_20221123_183117_GOES-West_original.png

Fig. 10.3 CSPP GEO ABI AIT GOES-17 Cloud Top Temperature GeoTIFF image (GOES-17_ABI_TEMP_20221123_183117_GOES-West.tif)

Add a color table, coastlines, borders and latitude/longitude grid lines to the image, and write the output to the file my_goes17_abi_ctt.png using the add_coastlines.sh script. The script provides many options, including the ability to add a colorbar title using the font of your choice (provide the path to the font location on your local machine):

add_coastlines.sh GOES-17_ABI_TEMP_20221123_183117_GOES-West.tif --add-colorbar --colorbar-text-color="black"   --colorbar-title="GOES-17 ABI Cloud Top Temperature (°K)  23 November 2022  18:30 UTC"   --add-coastlines --coastlines-outline "black" --coastlines-level 1 --coastlines-resolution=i --add-borders --borders-level 2 --borders-outline gray --coastlines-width 2  --colorbar-tick-marks 10 --colorbar-font /usr/share/fonts/gnu-free/FreeSerifBold.ttf -o my_goes17_abi_ctt.png
../_images/my_goes17_abi_ctt.png

Fig. 10.4 CSPP GEO ABI AIT GOES-17 Cloud Top Temperature GeoTIFF image with overlays (my_goes17_abi_ctt.png).

Users can aslo overlay Level 2 images onto other GeoTIFFS. In the example execution below, we overaly the Cloud Top Temperature GeoTIFF image on top of the GOES-17 true color image from the same time and name the output GeoTIFF “goes17_overlay_true_color_cloud_temperature.tif”.

overlay.sh GOES-17_ABI_RadC_true_color_20221123_183117_GOES-West.tif GOES-17_ABI_TEMP_20221123_183117_GOES-West.tif goes17_overlay_true_color_cloud_temperature.tif

The new combined GeoTIFF is displayed below.

../_images/goes17_overlay_true_color_cloud_temperature.png

Fig. 10.5 CSPP GOES-17 ABI cloud top temperatures overlaid on the coincident true color image from 23 November 2022, 18:31 UTC (goes17_overlay_true_color_cloud_temperature.tif).